Integrated Taxonomic Information System - Taxon Author Search Results


Source: Turbellarian taxonomic database, 1.7, database (version 1.7)

ITIS records citing this source
 
 Kingdom Animalia
  Acanthiella Rieger and Sterrer, 1975 -- valid
  Acanthiella chaetonotoides Rieger and Sterrer, 1975 -- valid
  Acanthomacrostomum Papi and Swedmark, 1959 -- valid
  Acanthomacrostomum gerlachi Ax, 1971 -- valid
  Acanthomacrostomum spiculiferum Papi and Swedmark, 1959 -- valid
  Acanthopharynx Reisinger, 1924 -- invalid
  Acanthopharynx arcanus Reisinger, 1924 -- invalid
  Acanthopseudomonocelis Curini-Galletti and Cannon, 1995 -- valid
  Acanthopseudomonocelis mirabilis Curini-Galletti and Cannon, 1995 -- valid
  Acanthozoon Collingwood, 1876 -- valid
  Acanthozoon albopapillosum Hyman, 1959 -- invalid
  Acanthozoon albopapillosus Hyman, 1959 -- valid
  Acanthozoon albopunctatum Prudhoe, 1978 -- valid
  Acanthozoon albopunctatus Prudhoe, 1978 -- invalid
  Acanthozoon alderi (Collingwood, 1876) -- valid
  Acanthozoon allmani (Collingwood, 1876) -- valid
  Acanthozoon armatum (Kelaart, 1858) -- valid
  Acanthozoon auropunctatum (Kelaart, 1858) -- valid
  Acanthozoon boehmigi (Stummer-Traunfels, 1895) -- valid
  Acanthozoon hispidum (Du Bois-Reymond Marcus, 1955) -- valid
  Acanthozoon hispidus (Du Bois-Reymond Marcus, 1955) -- invalid
  Acanthozoon indicum (Plehn, 1896) -- valid
  Acanthozoon lepidum (Heath and McGregor, 1912) -- valid
  Acanthozoon maculosum (Pearse, 1938) -- valid
  Acanthozoon marginatum (Plehn, 1896) -- valid
  Acanthozoon micropapillosum (Kato, 1934) -- invalid
  Acanthozoon micropapillosus (Kato, 1934) -- invalid
  Acanthozoon nigropapillosum Hyman, 1959 -- invalid
  Acanthozoon nigropapillosus Hyman, 1959 -- invalid
  Acanthozoon obscurum (Stummer-Traunfels, 1895) -- valid
  Acanthozoon ovale (Schmarda, 1859) -- valid
  Acanthozoon papilio (Kelaart, 1858) -- invalid
  Acanthozoon papilionis (Kelaart, 1858) -- valid
  Acanthozoon plehni (Laidlaw, 1902) -- valid
  Acanthozoon semperi (Stummer-Traunfels, 1895) -- valid
  Acelis Diesing, 1862 -- invalid
  Acelis Plehn, 1896 -- invalid
  Acelis arctica Plehn, 1896 -- invalid
  Acelis crenulatum (Schmarda, 1859) -- invalid
  Aceros Lang, 1884 -- invalid
  Aceros baeckstromi Bock, 1923 -- invalid
  Aceros inconspicuus Lang, 1884 -- invalid
  Aceros langi Heath and McGregor, 1912 -- invalid
  Aceros maculatus Hallez, 1905 -- invalid
  Aceros meridianus Ritter-Zahony, 1907 -- invalid
  Aceros nationalis Plehn, 1896 -- invalid
  Aceros stylostomoides Gemmill and Leiper, 1907 -- invalid
  Aceros typhlus Bock, 1913 -- invalid
  Acerotisa Strand, 1928 -- valid
  Acerotisa alba (Freeman, 1933) -- valid
  Acerotisa arctica Hyman, 1953 -- valid
  Acerotisa baeckstroemi (Bock, 1923) -- invalid
  Acerotisa baiae Hyman, 1940 -- valid
  Acerotisa bituna Marcus, 1947 -- valid
  Acerotisa californica Hyman, 1953 -- valid
  Acerotisa inconspicua (Lang, 1884) -- valid
  Acerotisa langi (Heath and McGregor, 1912) -- valid
  Acerotisa leuca Marcus, 1947 -- valid
  Acerotisa maculata (Hallez, 1905) -- invalid
  Acerotisa meridiana (Ritter-Zahony, 1907) -- invalid
  Acerotisa multicelis Hyman, 1955 -- invalid
  Acerotisa nationalis (Plehn, 1896) -- valid
  Acerotisa notulata (Bosc, 1802) -- valid
  Acerotisa ochotensis Tokinova, 2015 -- valid
  Acerotisa pellucida Pearse, 1938 -- invalid
  Acerotisa piscatoria Marcus, 1947 -- invalid
  Acerotisa rugosa Hyman, 1959 -- invalid
  Acerotisa stylostomoides (Gemmill and Leiper, 1907) -- invalid
  Acerotisa typhla (Bock, 1913) -- valid
  Acestoplana Faubel, 1983 -- valid
  Acestoplana raffaelei (Ranzi, 1928) -- valid
  Achenella Cannon, 1993 -- valid
  Achenella cougal Cannon, 1993 -- valid
  Achenella sathonata Cannon, 1993 -- valid
  Achoerus Beklemischev, 1914 -- valid
  Achoerus caspius Beklemischev, 1914 -- valid
  Achoerus ferox Beklemischev, 1937 -- valid
  Achoerus pachycaudatus Dörjes, 1968 -- valid
  Acholades Hickman and Olsen, 1955 -- valid
  Acholades asteris Hickman and Olsen, 1955 -- valid
  Acholadidae Hickman and Olsen, 1955 -- valid
  Acirrostylus Van Steenkiste, Volonterio, Schockaert and Artois, 2008 -- valid
  Acirrostylus poncedeleoni Van Steenkiste, Volonterio, Schockaert and Artois, 2008 -- valid
  Acmostomum Schmarda, 1859 -- valid
  Acmostomum (Acmostomum) Schmarda, 1859 -- valid
  Acmostomum (Tuilica) Marcus, 1951 -- valid
  Acmostomum canarium Marcus, 1947 -- valid
  Acmostomum crenulatum Schmarda, 1859 -- invalid
  Acmostomum cyprinae Graff, 1882 -- invalid
  Acmostomum denticulatum Schmarda, 1859 -- valid
  Acmostomum dioicum Metschnikoff, 1865 -- valid
  Acmostomum evelina (Marcus, 1951) -- valid
  Acmostomum groenlandicum Levinsen, 1879 -- invalid
  Acmostomum mecznikowski Kulinitch, 1973 -- valid
  Acmostomum obscurum (An der Lan, 1936) -- valid
  Acmostomum rovignense Steinböck, 1933 -- invalid
  Acmostomum rufodorsatum Uljanin, 1870 -- invalid
  Acmostomum sarsii (Jensen, 1878) -- invalid
  Acmostomum tergestinum Steinböck, 1933 -- invalid
  Acoela Uljanin, 1870 -- valid
  Acoelomorpha Ehlers, 1985 -- valid
  Acotylea Lang, 1884 -- valid
  Acotylina Pearse, 1936 -- invalid
  Acrochordonoposthia Reisinger, 1924 -- valid
  Acrochordonoposthia apopera Reisinger, 1924 -- valid
  Acrochordonoposthia conica Reisinger, 1924 -- valid
  Acrochordonoposthia diademula Schwank, 1980 -- valid
  Acrochordonoposthia nemoralis Reisinger, 1924 -- valid
  Acrochordonoposthia ophiocephala Reisinger, 1924 -- valid
  Acrochordonoposthia ramolia An der Lan, 1958 -- valid
  Acrochordonoposthia reversa Reisinger, 1924 -- valid
  Acrochordonoposthia robusta Luther, 1963 -- valid
  Acrochordonoposthia vandeputae Houben, Proesmans and Artois, 2014 -- valid
  Acromyadenium de Beauchamp, 1931 -- valid
  Acromyadenium maroccanum de Beauchamp, 1931 -- valid
  Acrorhynchides Strand, 1928 -- valid
  Acrorhynchides caledonicus (Claparède, 1861) -- valid
  Acrorhynchides robustus (Karling, 1931) -- valid
  Acrorhynchides styliferus Schockaert and Karling, 1975 -- valid
  Acrorhynchidinae Evdonin, 1977 -- invalid
  Acrorhynchina Graff, 1882 -- invalid
  Acrorhynchus Graff, 1882 -- valid
  Acrorhynchus baikalensis Rubtzoff, 1929 -- invalid
  Acrorhynchus bivittatus (Uljanin, 1870) -- invalid
  Acrorhynchus caledonicus (Claparède, 1861) -- invalid
  Acrorhynchus dolichocephalus (Pereyaslawzewa, 1892) -- invalid
  Acrorhynchus fluvialis Sibiriakova, 1929 -- invalid
  Acrorhynchus graciosus (Uljanin, 1870) -- valid
  Acrorhynchus heinckei Attems, 1897 -- invalid
  Acrorhynchus neocomensis (Fuhrmann, 1904) -- invalid
  Acrorhynchus ovatus (Uljanin, 1870) -- valid
  Acrorhynchus relictus Beklemischev, 1922 -- invalid
  Acrorhynchus reprobatus Graff, 1905 -- valid
  Acrorhynchus robustus Karling, 1931 -- invalid
  Acrorhynchus sophiae Graff, 1905 -- invalid
  Acrorhynchus spiralis (Pereyaslawzewa, 1892) -- invalid
  Acrorhynchus spongiosus Beklemischev, 1922 -- invalid
  Acrumena Brunet, 1965 -- valid
  Acrumena massiliensis Brunet, 1965 -- valid
  Acrumeninae Karling, 1980 -- valid
  Actinodactyla Haswell, 1893 -- invalid
  Actinodactylella Haswell, 1893 -- valid
  Actinodactylella blanchardi Haswell, 1893 -- valid
  Actinodactylella haswelli Monticelli, 1898 -- invalid
  Actinodactylellidae Benham, 1901 -- valid
  Actinoposthia An der Lan, 1936 -- valid
  Actinoposthia beklemischevi Mamkaev, 1965 -- valid
  Actinoposthia biaculeata Faubel, 1974 -- valid
  Actinoposthia caudata An der Lan, 1936 -- valid
  Actinoposthia haplovata Dörjes, 1968 -- invalid
  Actinoposthia longa Faubel, 1976 -- valid
  Actinoposthia pigmentea Faubel, 1976 -- valid
  Actinoposthiidae Hooge, 2001 -- valid
  Aculeorhynchidae Schilke, 1969 -- valid
  Aculeorhynchus Schilke, 1969 -- valid
  Aculeorhynchus glandulis Schilke, 1969 -- valid
  Adeloposthia An der Lan, 1936 -- invalid
  Adeloposthia elegans An der Lan, 1936 -- invalid
  Adenocauda Dörjes, 1968 -- valid
  Adenocauda helgolandica Dörjes, 1968 -- valid
  Adenocerca Reisinger, 1924 -- valid
  Adenocerca bresslaui Reisinger, 1924 -- valid
  Adenocerca clinopharynx Reisinger, 1924 -- valid
  Adenocerca minima Kolasa, 1981 -- valid
  Adenocerca teshirogii Kolasa, 1981 -- valid
  Adenodactyloplana Bulnes, Faubel and Ponce de Leon, 2003 -- valid
  Adenodactyloplana uruguayensis Bulnes, Faubel and Ponce de Leon, 2003 -- valid
  Adenopea Antonius, 1968 -- valid
  Adenopea cenata (Du Bois-Reymond Marcus, 1955) -- valid
  Adenopea chuni (Brauner, 1920) -- valid
  Adenopea illardatus (Lohner and Micoletzky, 1911) -- valid
  Adenopharynx Ehlers, 1972 -- valid
  Adenopharynx mitrabursalis Ehlers, 1972 -- valid
  Adenoplana Stummer-Traunfels, 1933 -- valid
  Adenoplana antillarum Hyman, 1955 -- invalid
  Adenoplana evelinae Marcus, 1950 -- valid
  Adenoplana obovata (Schmarda, 1859) -- valid
  Adenoplana platae Hyman, 1955 -- valid
  Adenoplea Reisinger, 1924 -- valid
  Adenoplea armata Reisinger, 1924 -- valid
  Adenoplea inermis Reisinger, 1924 -- valid
  Adenoplea meridionalis Kolasa, 1981 -- valid
  Adenoplea nanus Sayre and Wergen, 1994 -- valid
  Adenoplea paraproxenetes Reisinger, 1924 -- valid
  Adenoplea perigraptopera Reisinger, 1924 -- valid
  Adenoplea pinguis Reisinger, 1924 -- valid
  Adenoplea reisingeri Houben, Proesmans and Artois, 2015 -- valid
  Adenoplea weyeri An der Lan, 1955 -- valid
  Adenorhynchinae Ax and Heller, 1970 -- valid
  Adenorhynchus Meixner, 1938 -- valid
  Adenorhynchus balticus Meixner, 1938 -- valid
  Adiaphanida Norén and Jondelius, 2002 -- invalid
  Aechmalotus Beklemischev, 1915 -- valid
  Aechmalotus pyrola Beklemischev, 1915 -- invalid
  Aechmalotus pyrula Beklemischev, 1915 -- valid
  Aegira Willems, Artois, Vermin, Backeljau and Schockaert, 2005 -- valid
  Aegira annabellae Willems, Artois, Vermin, Backeljau and Schockaert, 2005 -- valid
  Africatenula Young, 1976 -- valid
  Africatenula riuruae Young, 1976 -- valid
  Afronta Hyman, 1944 -- valid
  Afronta aurantiaca Hyman, 1944 -- valid
  Afronta rubra Faubel, 1976 -- valid
  Akamptostoma Riedl, 1959 -- invalid
  Akamptostoma spongiphilum Riedl, 1959 -- invalid
  Alaoplana Kenk, 1974 -- valid
  Alaoplana lanceolata (Grube, 1872) -- valid
  Alaoplana sublanceolata (Livanov and Porfirieva, 1964) -- valid
  Alaskaplana Ax and Armonies, 1990 -- valid
  Alaskaplana velox Ax and Armonies, 1990 -- valid
  Alauretta Mereschkowsky, 1878 -- invalid
  Alauretta viridirostrum Mereschkowsky, 1878 -- invalid
  Alaurina Busch, 1851 -- valid
  Alaurina alba Attems, 1897 -- valid
  Alaurina claparedii Graff, 1882 -- valid
  Alaurina composita Metschnikoff, 1861 -- valid
  Alaurina prolifera Busch, 1851 -- valid
  Alaurina viridirostrum (Mereschkowsky, 1878) -- valid
  Albertorhynchus Schockaert, 1976 -- invalid
  Albertorhynchus amai Schockaert, 1976 -- invalid
  Albioplanaria Kawakatsu, 1966 -- invalid
  Albiplanaria Komarek, 1926 -- invalid
  Albiplanaria albissima (Vejdovsky, 1883) -- invalid
  Albiplanaria coarctica (Arndt, 1920) -- invalid
  Albiplanaria macedonica (Stankovic, 1926) -- invalid
  Albiplanaria maculata Stankovic, 1938 -- invalid
  Alcha Marcus, 1949 -- valid
  Alcha evelinae Marcus, 1949 -- valid
  Alchoides Willems, Schockaert and Artois, 2006 -- valid
  Alchoides alchoides Willems, Schockaert and Artois, 2006 -- valid
  Alchoides dittmannae Willems, Schockaert and Artois, 2006 -- valid
  Alexlutheria Karling, 1956 -- valid
  Alexlutheria acrosiphoniae Karling, 1956 -- valid
  Alexlutheria psammophila Ax, 2008 -- valid
  Alleena Marcus, 1947 -- invalid
  Alleena callizona Marcus, 1947 -- invalid
  Alleena mexicana Hyman, 1953 -- invalid
  Alloeocoela Graff, 1882 -- invalid
  Alloeopharynx Steinböck, 1932 -- invalid
  Alloeopharynx makropharynx Steinböck, 1932 -- invalid
  Alloeostyliphora Curini-Galletti, Oggiano and Casu, 2001 -- valid
  Alloeostyliphora mirabilis Curini-Galletti, Oggiano and Casu, 2001 -- valid
  Allogenus Sluys, 1989 -- valid
  Allogenus kerguelenense (Hyman, 1958) -- valid
  Allogenus sluysi Volonterio and Berwin, 2013 -- valid
  Alloiocoela Graff, 1882 -- invalid
  Alloioplana Plehn, 1896 -- valid
  Alloioplana aulica (Marcus, 1947) -- valid
  Alloioplana californica (Heath and McGregor, 1912) -- invalid
  Alloioplana delicata Plehn, 1896 -- valid
  Alloioplana sandiegensis (Boone, 1929) -- invalid
  Alloioplana stylifera (Hyman, 1953) -- valid
  Alloioplana wyona (Marcus and Marcus, 1968) -- valid
  Allopharynx Steinböck, 1932 -- invalid
  Allostoma Beneden, 1860 -- valid
  Allostoma album (Levinsen, 1879) -- invalid
  Allostoma amoenum Karling, 1962 -- valid
  Allostoma austriacum (Graff, 1882) -- invalid
  Allostoma calyx Graff, 1911 -- invalid
  Allostoma capitatum (Uljanin, 1870) -- invalid
  Allostoma catinosum (Beklemischev, 1927) -- valid
  Allostoma crassicystiferum (Westblad, 1952) -- valid
  Allostoma discors (Levinsen, 1879) -- invalid
  Allostoma durum (Fuhrmann, 1896) -- valid
  Allostoma evelinae (Marcus, 1948) -- invalid
  Allostoma fingalianum (Claparède, 1861) -- invalid
  Allostoma flavibacillum Jensen, 1878 -- invalid
  Allostoma graffi (de Beauchamp, 1913) -- invalid
  Allostoma hopkinsi Karling, 1993 -- valid
  Allostoma monophthalmum Steinböck, 1933 -- invalid
  Allostoma monotrochum Graff, 1882 -- invalid
  Allostoma neostiliferum Karling, 1993 -- valid
  Allostoma oerstedi (Levinsen, 1879) -- valid
  Allostoma pallidum Beneden, 1860 -- valid
  Allostoma uterinum (Westblad, 1952) -- valid
  Allostomidae Graff, 1882 -- invalid
  Allostominae Graff, 1882 -- invalid
  Alluna Faubel and Regier, 1983 -- valid
  Alluna sublitoralis Faubel and Regier, 1983 -- valid
  Alluna vulgaris Faubel and Regier, 1983 -- invalid
  Alvaera Bock, 1923 -- invalid
  Alvaera dioicum (Metschnikoff, 1865) -- invalid
  Alvaera sarsi (Jensen, 1878) -- invalid
  Amaga Ogren and Kawakatsu, 1990 -- valid
  Amaga amagensis (Fuhrmann, 1912) -- valid
  Amaga becki (Fuhrmann, 1912) -- valid
  Amaga bogotensis (Graff, 1899) -- invalid
  Amaga bogotensis bogotensis (Graff, 1899) -- invalid
  Amaga bogotensis buergeri (Busson, 1903) -- invalid
  Amaga buergeri (Busson, 1903) -- invalid
  Amaga bussoni (C. G. Froehlich, 1959) -- valid
  Amaga contamanensis (Hyman, 1955) -- valid
  Amaga expatria Jones and Sterrer, 2005 -- valid
  Amaga libbieae (Du Bois-Reymond Marcus, 1958) -- valid
  Amaga olivacea (Schultze and F. Müller, 1857) -- valid
  Amaga ortizi (Fuhrmann, 1912) -- valid
  Amaga righii (E. M. Froehlich, 1972) -- valid
  Amaga ruca (Marcus, 1954) -- valid
  Amakusaplana Kato, 1938 -- valid
  Amakusaplana acroporae Rawlinson, Gillis, Billings and Borneman, 2011 -- valid
  Amakusaplana ohshimae Kato, 1938 -- valid
  Amakusaplana ohshimai Kato, 1938 -- invalid
  Amblyceraeus Plehn, 1898 -- invalid
  Amblyceraeus luteus Plehn, 1897 -- invalid
  Amblyplana Graff, 1896 -- invalid
  Amblyplana aberana Mell, 1904 -- invalid
  Amblyplana braueri Graff, 1899 -- invalid
  Amblyplana caffra Jameson, 1907 -- invalid
  Amblyplana capensis Graff, 1899 -- invalid
  Amblyplana cockerelli Graff, 1899 -- invalid
  Amblyplana cylindrica de Beauchamp, 1913 -- invalid
  Amblyplana ehrenbergi Graff, 1899 -- invalid
  Amblyplana flava (Moseley, 1877) -- invalid
  Amblyplana flavescens Jameson, 1907 -- invalid
  Amblyplana fuliginea Graff, 1899 -- invalid
  Amblyplana fusca (Moseley, 1877) -- invalid
  Amblyplana graffi Geba, 1909 -- invalid
  Amblyplana haeckeli Graff, 1899 -- invalid
  Amblyplana hepaticarum Jameson, 1907 -- invalid
  Amblyplana knysensis Graff, 1899 -- invalid
  Amblyplana kuekenthali Mell, 1903 -- invalid
  Amblyplana maheensis Graff, 1899 -- invalid
  Amblyplana mediostriata Geba, 1909 -- invalid
  Amblyplana montoyae Fuhrmann, 1912 -- invalid
  Amblyplana natalensis Jameson, 1907 -- invalid
  Amblyplana neumanni Mell, 1904 -- invalid
  Amblyplana nigrescens Mell, 1904 -- invalid
  Amblyplana notabilis Graff, 1899 -- invalid
  Amblyplana notabilis angolense (de Beauchamp, 1951) -- invalid
  Amblyplana teres Graff, 1899 -- invalid
  Amblyplana tetracladea Wilczynski, 1920 -- invalid
  Amblyplana trifuscolineata Kaburaki, 1920 -- invalid
  Amblyplana tristriata Geba, 1909 -- invalid
  Amblyplana viridis Jameson, 1907 -- invalid
  Amblyplana voeltzkowi Geba, 1909 -- invalid
  Amblyplana zenkeri Graff, 1899 -- invalid
  Amemiyaia Kato, 1944 -- valid
  Amemiyaia pacifica Kato, 1944 -- valid
  Americanaplana Ax and Ax, 1967 -- valid
  Americanaplana fernaldi Ax and Ax, 1967 -- valid
  Ametochus Willems, Schockaert and Artois, 2006 -- valid
  Ametochus gehrkei Willems, Schockaert and Artois, 2006 -- valid
  Amphibolella Findenegg, 1924 -- valid
  Amphibolella segnis Findenegg, 1924 -- valid
  Amphichoerus Graff, 1891 -- invalid
  Amphichoerus cinereus (Graff, 1874) -- invalid
  Amphichoerus langerhansi (Graff, 1882) -- invalid
  Amphichoerus virescens (Ĝrsted, 1845) -- invalid
  Amphirhynchus Schilke, 1970 -- valid
  Amphirhynchus caudatus Schilke, 1970 -- valid
  Amphiscolops Graff, 1904 -- valid
  Amphiscolops australis (Haswell, 1905) -- invalid
  Amphiscolops bermudensis Hyman, 1939 -- valid
  Amphiscolops blumi Achatz, Hooge and Tyler, 2007 -- invalid
  Amphiscolops carvalhoi Marcus, 1952 -- invalid
  Amphiscolops cinereus (Graff, 1874) -- valid
  Amphiscolops evelinae Marcus, 1947 -- valid
  Amphiscolops fuligineus Peebles, 1913 -- valid
  Amphiscolops gardineri Graff, 1911 -- invalid
  Amphiscolops gemelliporus Marcus, 1954 -- valid
  Amphiscolops japonicus Kato, 1947 -- valid
  Amphiscolops langerhansi (Graff, 1882) -- invalid
  Amphiscolops marinelliensis Beltagi and Khafagi, 1984 -- valid
  Amphiscolops mosaicus Kozloff, 1998 -- valid
  Amphiscolops potocani Achatz, 2008 -- valid
  Amphiscolops sargassi Hyman, 1939 -- invalid
  Amphiscolops trifurcatus (Beltagi, 1983) -- valid
  Amphiscolops virescens (Ĝrsted, 1845) -- invalid
  Amphiscolops zeii Riedl, 1956 -- valid
  Amphiscolopus Kato, 1957 -- invalid
  Amphiscolopus japonicus Kato, 1947 -- invalid
  Amyadenium de Beauchamp, 1931 -- invalid
  Amyadenium beauchampi Gourbault, 1969 -- invalid
  Amyadenium brementi (de Beauchamp, 1919) -- invalid
  Amyadenium brementi oculatum Porfirieva, 1958 -- invalid
  Amyadenium chattoni de Beauchamp, 1949 -- invalid
  Amyadenium garmieri de Beauchamp, 1950 -- invalid
  Amyadenium vandeli de Beauchamp, 1931 -- invalid
  Amyella Bock, 1922 -- valid
  Amyella lineata Bock, 1922 -- valid
  Amyellidae Faubel, 1984 -- valid
  Amyris Marcus and Marcus, 1968 -- valid
  Amyris favis Sopott-Ehlers and Schmidt, 1975 -- valid
  Amyris hummelincki Marcus and Marcus, 1968 -- valid
  Amyris ujara Marcus and Marcus, 1968 -- valid
  Anandroplana Hyman, 1955 -- valid
  Anandroplana muscularis Hyman, 1955 -- valid
  Anandroplana portoricensis Hyman, 1955 -- valid
  Anaperidae Dörjes, 1968 -- invalid
  Anaperus Graff, 1911 -- valid
  Anaperus australis Westblad, 1952 -- valid
  Anaperus balticus Meixner, 1938 -- invalid
  Anaperus biaculeatus Boguta, 1970 -- valid
  Anaperus diploposthia (Steinböck, 1931) -- invalid
  Anaperus gardineri (Graff, 1911) -- valid
  Anaperus ornatus Beltagi, 2001 -- valid
  Anaperus rubellus Westblad, 1945 -- valid
  Anaperus singularis Hooge and Smith, 2004 -- valid
  Anaperus sulcatus Beklemischev, 1914 -- valid
  Anaperus trifurcatus Beltagi, 1983 -- invalid
  Anaperus tvaerminnensis (Luther, 1912) -- valid
  Anciliplana Heath and McGregor, 1912 -- valid
  Anciliplana graffi Heath and McGregor, 1912 -- valid
  Ancistrorhynchus L'Hardy, 1963 -- valid
  Ancistrorhynchus ischnurus L'Hardy, 1963 -- valid
  Ancoratheca Prudhoe, 1982 -- valid
  Ancoratheca australiensis Prudhoe, 1982 -- valid
  Ancoratheca pacifica (Bock, 1923) -- invalid
  Ancoratheca pacificus (Bock, 1923) -- invalid
  Ancyclocirrus Kozloff, 2000 -- invalid
  Ancylocirrus Kozloff, 2000 -- valid
  Ancylocirrus ornatus Kozloff, 2000 -- valid
  Anisorhynchodemus Kawakatsu, E. M. Froehlich, Jones, Ogren and Sasaki, 2003 -- valid
  Anisorhynchodemus albicinctus (Graff, 1899) -- valid
  Anisorhynchodemus amboinensis (Graff, 1899) -- valid
  Anisorhynchodemus assimilis (Geba, 1909) -- valid
  Anisorhynchodemus belli (Graff, 1899) -- valid
  Anisorhynchodemus bistriatus (Grube, 1868) -- valid
  Anisorhynchodemus boehmigi (Graff, 1899) -- valid
  Anisorhynchodemus boholicus (Graff, 1899) -- valid
  Anisorhynchodemus borelli (Graff, 1894) -- valid
  Anisorhynchodemus bosci (Graff, 1899) -- valid
  Anisorhynchodemus cameliae (Fuhrmann, 1912) -- valid
  Anisorhynchodemus chuni (Graff, 1899) -- valid
  Anisorhynchodemus conradti (Graff, 1899) -- valid
  Anisorhynchodemus conspersus (Graff, 1899) -- valid
  Anisorhynchodemus cultratus (Graff, 1898) -- valid
  Anisorhynchodemus demani (Graff, 1899) -- valid
  Anisorhynchodemus diesingi (Graff, 1899) -- valid
  Anisorhynchodemus diorchis (Fuhrmann, 1914) -- valid
  Anisorhynchodemus dubius (Spencer, 1892) -- valid
  Anisorhynchodemus dugesi (Graff, 1899) -- valid
  Anisorhynchodemus excavatus (Graff, 1899) -- valid
  Anisorhynchodemus figdori (Graff, 1899) -- valid
  Anisorhynchodemus fletcheri (Spencer, 1892) -- valid
  Anisorhynchodemus forrestianus (Schröder, 1924) -- valid
  Anisorhynchodemus gebaboehmigi Kawakatsu, E. M. Froehlich, Jones, Ogren and Sasaki, 2003 -- valid
  Anisorhynchodemus guttatus (Fletcher and Hamilton, 1888) -- valid
  Anisorhynchodemus hallezi (Graff, 1899) -- valid
  Anisorhynchodemus insularis (Graff, 1899) -- valid
  Anisorhynchodemus joubini (Hallez, 1894) -- valid
  Anisorhynchodemus kraepelini (Graff, 1899) -- valid
  Anisorhynchodemus laterolineatus (Spencer, 1892) -- valid
  Anisorhynchodemus leidyi (Graff, 1899) -- valid
  Anisorhynchodemus lindsaysianus (Schröder, 1924) -- valid
  Anisorhynchodemus lineolatus (Graff, 1899) -- valid
  Anisorhynchodemus lubbocki (Graff, 1899) -- valid
  Anisorhynchodemus luteicollis (Graff, 1899) -- valid
  Anisorhynchodemus maculatus (Fuhrmann, 1914) -- valid
  Anisorhynchodemus mediolineatus (Spencer, 1892) -- valid
  Anisorhynchodemus megalophthalma (Loman, 1890) -- valid
  Anisorhynchodemus mertoni (Schröder, 1916) -- valid
  Anisorhynchodemus michaelsoni (Graff, 1899) -- valid
  Anisorhynchodemus miniatus (Graff, 1899) -- valid
  Anisorhynchodemus mitchellianus (Schröder, 1924) -- valid
  Anisorhynchodemus montanus (Mell, 1904) -- valid
  Anisorhynchodemus moseleyi (Fletcher and Hamilton, 1888) -- valid
  Anisorhynchodemus nematoides (Loman, 1890) -- valid
  Anisorhynchodemus nietneri (Humbert and Claparède, 1862) -- valid
  Anisorhynchodemus niger (Fletcher and Hamilton, 1888) -- valid
  Anisorhynchodemus nolli (Graff, 1899) -- valid
  Anisorhynchodemus obscurus (Fletcher and Hamilton, 1888) -- valid
  Anisorhynchodemus pellucidus (Graff, 1899) -- valid
  Anisorhynchodemus picta (Graff, 1899) -- valid
  Anisorhynchodemus pilleata (Whitehouse, 1915) -- valid
  Anisorhynchodemus procera (Graff, 1899) -- valid
  Anisorhynchodemus putzei (Graff, 1899) -- valid
  Anisorhynchodemus quadristriatus (Grube, 1868) -- valid
  Anisorhynchodemus rubrocinctus (Graff, 1899) -- valid
  Anisorhynchodemus scriptus (Steel, 1897) -- valid
  Anisorhynchodemus septemstriatus (Graff, 1899) -- valid
  Anisorhynchodemus sharpi (Graff, 1899) -- valid
  Anisorhynchodemus signata (Graff, 1899) -- valid
  Anisorhynchodemus simulans (Dendy, 1892) -- valid
  Anisorhynchodemus stenopus (Graff, 1894) -- valid
  Anisorhynchodemus tabatteldili (Graff, 1899) -- valid
  Anisorhynchodemus tetracelis (Haslauer-Gamisch, 1981) -- valid
  Anisorhynchodemus trilineatus (Fletcher and Hamilton, 1888) -- valid
  Anisorhynchodemus tristis (Graff, 1899) -- valid
  Anisorhynchodemus varians (Graff, 1899) -- invalid
  Anisorhynchodemus waburtonianus (Schröder, 1924) -- valid
  Anisorhynchodemus whiteleggei (Spencer, 1892) -- valid
  Anisorhynchodemus woodassimilis Kawakatsu, E. M. Froehlich, Jones, Ogren and Sasaki, 2003 -- valid
  Annalisella Karling, 1978 -- valid
  Annalisella bermudensis Karling, 1978 -- valid
  Annulorhynchus Karling, 1956 -- valid
  Annulorhynchus adriaticus Karling, 1956 -- valid
  Annulovortex Beklemischev, 1953 -- valid
  Annulovortex monodon Beklemischev, 1953 -- valid
  Anocelis Stimpson, 1857 -- invalid
  Anocelis Grube, 1872 -- invalid
  Anocelis caeca (Rubstov, 1928) -- invalid
  Anocelis caeca Vejdovsky, 1883 -- invalid
  Anocelis caeca (A. L. Dugès, 1830) -- invalid
  Anocelis fuliginosa (Leidy, 1851) -- invalid
  Anocelis hepatizon (Grube, 1872) -- invalid
  Anocelis lanceolata Grube, 1872 -- invalid
  Anocelis pardalina (Grube, 1872) -- invalid
  Anocelis stagnalis (O. F. Müller, 1774) -- invalid
  Anocelis sublanceolata Livanov and Porfirieva, 1964 -- invalid
  Anocelis tigrina (Grube, 1872) -- invalid
  Anocellidae Quiroga, Bolaños and Litvaitis, 2006 -- valid
  Anocellidus Quiroga, Bolaños and Litvaitis, 2006 -- valid
  Anocellidus profundus Quiroga, Bolaños and Litvaitis, 2006 -- valid
  Anokkostenostomum Noreña, Damborenea and Brusa, 2005 -- invalid
  Anokkostenostomum anatirostrum (Marcus, 1945) -- invalid
  Anokkostenostomum anops (Nuttycombe and Waters, 1938) -- invalid
  Anokkostenostomum brevipharyngium (Kepner and Carter, 1931) -- invalid
  Anokkostenostomum corderoi (Marcus, 1945) -- invalid
  Anokkostenostomum evelinae (Marcus, 1945) -- invalid
  Anokkostenostomum gigerium (Kepner and Carter, 1931) -- invalid
  Anokkostenostomum grabbskogense (Luther, 1960) -- invalid
  Anokkostenostomum karlingi (Luther, 1960) -- invalid
  Anokkostenostomum mandibulatum (Kepner and Carter, 1931) -- invalid
  Anokkostenostomum membranosum (Kepner and Carter, 1931) -- invalid
  Anokkostenostomum pegephilum (Nuttycombe and Waters, 1938) -- invalid
  Anokkostenostomum predatorium (Kepner and Carter, 1931) -- invalid
  Anokkostenostomum pseudoacetabulum (Nuttycombe and Waters, 1935) -- invalid
  Anokkostenostomum romanae (Kolasa, 1981) -- invalid
  Anokkostenostomum saliens (Kepner and Carter, 1931) -- invalid
  Anokkostenostomum tuberculosum (Nuttycombe and Waters, 1938) -- invalid
  Anokkostenostomum ventronephrium (Nuttycombe, 1932) -- invalid
  Anomalocoelus Haswell, 1905 -- invalid
  Anomalocoelus caecus Haswell, 1905 -- invalid
  Anonymidae Lang, 1884 -- valid
  Anonymus Lang, 1884 -- valid
  Anonymus kaikourensis Holleman, 1998 -- valid
  Anonymus multivirilis Holleman, 1998 -- valid
  Anonymus virilis Lang, 1884 -- valid
  Anoplodiera Westblad, 1930 -- valid
  Anoplodiera loutfia (Khalil and Azim, 1937) -- invalid
  Anoplodiera voluta Westblad, 1930 -- valid
  Anoplodiopsis Westblad, 1953 -- valid
  Anoplodiopsis gracilis Westblad, 1953 -- valid
  Anoplodium Schneider, 1858 -- valid
  Anoplodium (Anoplodiella) Bock, 1925 -- invalid
  Anoplodium chirodotae Sabussow, 1900 -- valid
  Anoplodium clypeasteris Graff, 1882 -- invalid
  Anoplodium evelinae Marcus, 1949 -- valid
  Anoplodium gracile Wahl, 1906 -- invalid
  Anoplodium graffi (Monticelli, 1892) -- valid
  Anoplodium heronensis Cannon, 1990 -- valid
  Anoplodium hymanae Shinn, 1983 -- valid
  Anoplodium leighi Cannon, 1990 -- valid
  Anoplodium longeductum Hyman, 1960 -- valid
  Anoplodium mediale Ozaki, 1932 -- valid
  Anoplodium myriotrochi Graff, 1882 -- valid
  Anoplodium mytili Levinsen, 1879 -- invalid
  Anoplodium parasita Schneider, 1858 -- valid
  Anoplodium pusillum Monticelli, 1892 -- invalid
  Anoplodium ramosum Hyman, 1960 -- valid
  Anoplodium schneideri Semper, 1868 -- invalid
  Anoplodium stichopi Bock, 1925 -- valid
  Anoplodium tubiferum Westblad, 1953 -- valid
  Anoplorhynchus Meixner, 1925 -- invalid
  Anoplorhynchus piger Meixner, 1925 -- invalid
  Anortha Leidy, 1851 -- invalid
  Anortha gracilis Leidy, 1851 -- invalid
  Anotocelis Diesing, 1862 -- invalid
  Anotocelis caudata (Leidy, 1852) -- invalid
  Anotocelis coluber (Leydig, 1854) -- invalid
  Anotocelis flavicaris (Ehrenberg, 1831) -- invalid
  Anotocelis linearis (O. F. Müller, 1773) -- invalid
  Anotocelis philadelphia (Leidy, 1852) -- invalid
  Anotocelis unicolor (Schmidt, 1848) -- invalid
  Anotocelis variabilis (Leidy, 1851) -- invalid
  Anthopharynginae Ehlers, 1972 -- valid
  Anthopharynx Karling, 1940 -- valid
  Anthopharynx sacculipenis Ehlers, 1972 -- valid
  Anthopharynx vaginatus Karling, 1940 -- valid
  Antiboreorhynchus Karling, 1952 -- valid
  Antiboreorhynchus novzelae Karling and Schockaert, 1977 -- valid
  Antiboreorhynchus torquatus Karling, 1952 -- valid
  Antigonaria Dörjes, 1968 -- valid
  Antigonaria arenaria Dörjes, 1968 -- valid
  Antigonariidae Dörjes, 1968 -- valid
  Antromacrostomum Faubel, 1974 -- valid
  Antromacrostomum armatum Faubel, 1974 -- valid
  Antroposthia Faubel, 1974 -- valid
  Antroposthia axi Faubel, 1974 -- valid
  Antroposthia unipora Faubel, 1974 -- valid
  Antroposthiidae Faubel, 1976 -- valid
  Antrosagittifera Hooge and Tyler, 2001 -- valid
  Antrosagittifera corallina Hooge and Tyler, 2001 -- valid
  Anzoplana Winsor, 2006 -- valid
  Anzoplana trilineata Winsor, 2006 -- valid
  Anzoplanini Winsor, 2006 -- valid
  Aotearoa Holleman, 2007 -- valid
  Aotearoa ballantinensis Holleman, 2007 -- valid
  Aphanostoma Ĝrsted, 1845 -- valid
  Aphanostoma album Dörjes, 1968 -- valid
  Aphanostoma armatum Steinböck and Lanser, 1932 -- invalid
  Aphanostoma aurantiacum Verrill, 1893 -- invalid
  Aphanostoma auratiacum Verrill, 1893 -- invalid
  Aphanostoma auritum Westblad, 1946 -- invalid
  Aphanostoma auritum flavescens Westblad, 1946 -- invalid
  Aphanostoma auritum glandulosum Westblad, 1946 -- invalid
  Aphanostoma auritum typica Westblad, 1946 -- invalid
  Aphanostoma bimaculata Steinböck and Lanser, 1932 -- invalid
  Aphanostoma brusca Hooge, 2001 -- invalid
  Aphanostoma bruscai Hooge and Tyler, 2003 -- valid
  Aphanostoma cavernosum Meixner, 1938 -- valid
  Aphanostoma chromocephalum Steinböck, 1933 -- valid
  Aphanostoma collinae Hooge and Tyler, 2008 -- valid
  Aphanostoma divaceum Verrill, 1893 -- invalid
  Aphanostoma diversicolor Ĝrsted, 1845 -- invalid
  Aphanostoma elegans Jensen, 1878 -- valid
  Aphanostoma griseum Ĝrsted, 1845 -- invalid
  Aphanostoma latissimum Levinsen, 1879 -- invalid
  Aphanostoma latum Ĝrsted, 1845 -- invalid
  Aphanostoma lutheri Westblad, 1946 -- invalid
  Aphanostoma macrobursalium Westblad, 1946 -- invalid
  Aphanostoma macrospiriferum Westblad, 1946 -- invalid
  Aphanostoma minima Steinböck, 1938 -- invalid
  Aphanostoma minimum Westblad, 1946 -- invalid
  Aphanostoma minuta Böhmig, 1895 -- invalid
  Aphanostoma olivaceum Verrill, 1893 -- invalid
  Aphanostoma orphinum Marcus, 1950 -- invalid
  Aphanostoma pallidum Beklemischev, 1915 -- invalid
  Aphanostoma pisae Zauchner, Salvenmoser and Egger, 2015 -- valid
  Aphanostoma pulchella Pereyaslawzewa, 1892 -- invalid
  Aphanostoma rhomboides Jensen, 1878 -- valid
  Aphanostoma rhomboides Westblad, 1946 -- invalid
  Aphanostoma rubropunctata Pereyaslawzewa, 1892 -- invalid
  Aphanostoma sanguineum Beklemischev, 1915 -- valid
  Aphanostoma sensitiva (Uljanin, 1870) -- invalid
  Aphanostoma tenuissima Westblad, 1946 -- invalid
  Aphanostoma virescens Ĝrsted, 1845 -- valid
  Apidioplana Bock, 1926 -- valid
  Apidioplana apluda Cannon, 1990 -- valid
  Apidioplana mira Bock, 1926 -- valid
  Apidioplana okadai Kato, 1944 -- valid
  Apidioplana similis Bock, 1927 -- valid
  Apidioplanidae Bock, 1926 -- valid
  Apodendrocoelum de Beauchamp, 1931 -- invalid
  Apodendrocoelum brachyphallus (de Beauchamp, 1929) -- invalid
  Apodendrocoelum lipophallus (de Beauchamp, 1929) -- invalid
  Apodendrocoelum lipophallus superficialis Porfirieva, 1958 -- invalid
  Apodendrocoelum puteale (Kenk, 1930) -- invalid
  Apodendrocoelum superficialis Porfirieva, 1958 -- invalid
  Aprostatum Bock, 1913 -- valid
  Aprostatum clippertoni (Hyman, 1939) -- valid
  Aprostatum longipenis (Kato, 1943) -- valid
  Aprostatum stiliferum Bock, 1913 -- valid
  Aquaplana Hyman, 1953 -- valid
  Aquaplana oceanica Hyman, 1953 -- invalid
  Aquaplana pacifica Hyman, 1959 -- valid
  Archactinoposthia Dörjes, 1968 -- valid
  Archactinoposthia pelophila Dörjes, 1968 -- valid
  Archaphanostoma Dörjes, 1968 -- valid
  Archaphanostoma agile (Jensen, 1878) -- valid
  Archaphanostoma fontaneti Kċnneby, Bernvi and Jondelius, 2015 -- valid
  Archaphanostoma histobursalium Dörjes, 1968 -- valid
  Archaphanostoma macrospiriferum (Westblad, 1946) -- valid
  Archaphanostoma marcusi Hooge and Rocha, 2006 -- valid
  Archaphanostoma occulta Kċnneby, Bernvi and Jondelius, 2015 -- valid
  Archaphanostoma sublittoralis Kċnneby, Bernvi and Jondelius, 2015 -- valid
  Archaphanostoma ylvae Kċnneby, Bernvi and Jondelius, 2015 -- valid
  Archicotylus Korotneff, 1912 -- valid
  Archicotylus cinereus Korotneff, 1912 -- valid
  Archicotylus decoloratus Korotneff, 1912 -- valid
  Archicotylus elegans Porfirieva, Timoshkin and Zaytseva, 2009 -- invalid
  Archicotylus elongatus Korotneff, 1912 -- valid
  Archicotylus flavus Korotneff, 1912 -- invalid
  Archicotylus junca (Korotneff, 1912) -- invalid
  Archicotylus lacteus Korotneff, 1912 -- invalid
  Archicotylus maculatus Korotneff, 1912 -- invalid
  Archicotylus multiclada Korotneff, 1912 -- invalid
  Archicotylus parvipunctatus (Korotneff, 1912) -- valid
  Archicotylus planus (Sabussow, 1903) -- valid
  Archicotylus rubzowi Porfirieva, 1977 -- valid
  Archicotylus rutilus Korotneff, 1912 -- invalid
  Archicotylus stringulatus (Korotneff, 1912) -- invalid
  Archicotylus viviparus Rubtzoff, 1928 -- valid
  Archilina Ax, 1959 -- valid
  Archilina batiae Curini-Galletti and Martens, 1996 -- valid
  Archilina biselenifera Martens and Curini-Galletti, 1994 -- valid
  Archilina brachycirrus Martens and Curini-Galletti, 1994 -- valid
  Archilina caliban Martens and Curini-Galletti, 1994 -- valid
  Archilina deceptoria Martens and Curini-Galletti, 1994 -- valid
  Archilina duplaculeata (Ax and Armonies, 1990) -- valid
  Archilina endostyla Ax, 1959 -- valid
  Archilina etrusca Martens and Curini-Galletti, 1994 -- valid
  Archilina euglypta Curini-Galletti and Martens, 1996 -- valid
  Archilina israelitica Curini-Galletti and Martens, 1995 -- valid
  Archilina japonica Ax, 2008 -- valid
  Archilina opisthobursa Curini-Galletti and Martens, 1996 -- valid
  Archilina palestinica Martens and Curini-Galletti, 1994 -- valid
  Archilina papillosa (Ax and Ax, 1977) -- valid
  Archilina selenifera Martens and Curini-Galletti, 1994 -- valid
  Archilina stylifera Curini-Galletti and Martens, 1996 -- valid
  Archilina subtilis (Karling, Mack-Fira and Dörjes, 1972) -- valid
  Archilina vanderlandi (Martens and Curini-Galletti, 1989) -- valid
  Archiloa de Beauchamp, 1910 -- valid
  Archiloa cirrifera (Meixner, 1943) -- invalid
  Archiloa duplaculeata Ax and Armonies, 1990 -- invalid
  Archiloa endostyla (Ax, 1959) -- invalid
  Archiloa gabriellae (Marcus, 1949) -- invalid
  Archiloa inopinata Martens, 1984 -- valid
  Archiloa juliae Tajika, 1982 -- invalid
  Archiloa otoplanoides (Ax, 1951) -- invalid
  Archiloa papillosa Ax and Ax, 1977 -- invalid
  Archiloa petiti Ax, 1956 -- valid
  Archiloa polycirrus Curini-Galletti, 2014 -- valid
  Archiloa rivularis de Beauchamp, 1910 -- valid
  Archiloa scalopura (Marcus, 1949) -- invalid
  Archiloa scalopus Marcus, 1949 -- valid
  Archiloa septentrionalis Sopott, 1972 -- valid
  Archiloa spinosa (Jensen, 1878) -- invalid
  Archiloa subtilis Karling, Mack-Fira and Dörjes, 1972 -- invalid
  Archiloa tajikai Ax and Armonies, 1990 -- invalid
  Archiloa thelura (Marcus, 1951) -- invalid
  Archiloa unipunctata (Fabricius, 1826) -- invalid
  Archiloa vanderlandi Martens and Curini-Galletti, 1989 -- invalid
  Archiloa westbladi Ax, 1954 -- invalid
  Archiloa wilsoni Stirewalt, Kepner and Ferguson, 1940 -- invalid
  Archiloinae Faubel and Rohde, 1998 -- valid
  Archilopsis Meixner, 1938 -- valid
  Archilopsis arenaria Martens, Curini-Galletti and Pucinelli, 1989 -- valid
  Archilopsis inopinata Martens, Curini-Galletti and Pucinelli, 1989 -- invalid
  Archilopsis marifuga Martens, Curini-Galletti and Pucinelli, 1989 -- valid
  Archilopsis spinosa (Jensen, 1878) -- valid
  Archilopsis unipunctata (Fabricius, 1826) -- valid
  Archimacrostomum Ferguson, 1954 -- valid
  Archimacrostomum beaufortense (Ferguson, 1937) -- valid
  Archimacrostomum brasiliensis (Marcus, 1952) -- valid
  Archimacrostomum hustedi (Jones, 1944) -- valid
  Archimacrostomum sublitorale Faubel and Warwick, 2005 -- valid
  Archimonocelidae Meixner, 1938 -- valid
  Archimonocelidinae Meixner, 1938 -- valid
  Archimonocelis Meixner, 1938 -- valid
  Archimonocelis bathycola (Westblad, 1952) -- valid
  Archimonocelis carmelitana Martens and Curini-Galletti, 1993 -- valid
  Archimonocelis coronata Karling, 1967 -- valid
  Archimonocelis crucifera Martens and Curini-Galletti, 1993 -- valid
  Archimonocelis cygnicollis Curini-Galletti, Delogu, Campus and Casu, 1997 -- valid
  Archimonocelis glabrodorsata Martens and Curini-Galletti, 1993 -- valid
  Archimonocelis hasanuddin Martens and Curini-Galletti, 1989 -- valid
  Archimonocelis heljrichi Karling, Mack-Fira and Dörjes, 1972 -- valid
  Archimonocelis inopinata Martens and Curini-Galletti, 1993 -- valid
  Archimonocelis itoi Tajika, 1981 -- valid
  Archimonocelis keke Martens and Curini-Galletti, 1989 -- valid
  Archimonocelis koinocystis Karling, 1967 -- valid
  Archimonocelis marci Curini-Galletti, 2014 -- valid
  Archimonocelis mediterranea Meixner, 1938 -- valid
  Archimonocelis medusa Curini-Galletti and Cannon, 1997 -- valid
  Archimonocelis meixneri Martens and Curini-Galletti, 1993 -- valid
  Archimonocelis monicae Martens and Curini-Galletti, 1993 -- valid
  Archimonocelis oostendensis Martens and Schockaert, 1981 -- valid
  Archimonocelis parastaresoi Curini-Galletti, Delogu, Campus and Casu, 1997 -- valid
  Archimonocelis puertoricana Martens and Curini-Galletti, 1993 -- valid
  Archimonocelis rhizophoralis Martens and Curini-Galletti, 1989 -- valid
  Archimonocelis rohdei Miller and Faubel, 2003 -- valid
  Archimonocelis sabra Martens and Curini-Galletti, 1993 -- valid
  Archimonocelis scopulicola Curini-Galletti, Delogu, Campus and Casu, 1997 -- valid
  Archimonocelis semicircularis Karling, 1967 -- valid
  Archimonocelis staresoi Martens and Curini-Galletti, 1993 -- valid
  Archimonotresis Meixner, 1938 -- valid
  Archimonotresis limophila Meixner, 1938 -- valid
  Archipelagoplana Noldt and Hoxhold, 1984 -- valid
  Archipelagoplana triplocirro Noldt and Hoxhold, 1984 -- valid
  Archiproporus An der Lan, 1936 -- invalid
  Archiproporus minimus An der Lan, 1936 -- invalid
  Archivortex Reisinger, 1924 -- valid
  Archivortex silvestris Reisinger, 1924 -- valid
  Archocelis Dörjes, 1968 -- valid
  Archocelis macrorhabditis Dörjes, 1968 -- valid
  Archopistomum An der Lan, 1939 -- valid
  Archopistomum macedonicum An der Lan, 1939 -- valid
  Archotoplana Ax, 1956 -- valid
  Archotoplana abutaensis Tajika, 1983 -- valid
  Archotoplana dillonbeachensis Karling, 1964 -- valid
  Archotoplana holotricha Ax, 1956 -- valid
  Archotoplana macrostylis Ax and Armonies, 1990 -- valid
  Archotoplana yamadai Tajika, 1983 -- valid
  Archotoplaninae Ax, 1956 -- valid
  Armatoplana Faubel, 1983 -- valid
  Armatoplana affinis (Palombi, 1940) -- valid
  Armatoplana celta Noreña, Rodriquez, Perez and Almon, 2015 -- valid
  Armatoplana colombiana Bolaños, Quiroga and Litvaitis, 2006 -- valid
  Armatoplana divae (Marcus, 1947) -- valid
  Armatoplana lactea (Laidlaw, 1903) -- valid
  Armatoplana lactoalba (Verrill, 1900) -- valid
  Armatoplana leptalea (Marcus, 1947) -- valid
  Armatoplana panamensis (Plehn, 1896) -- valid
  Armatoplana rabita (Marcus and Marcus, 1968) -- valid
  Armatoplana reishi (Hyman, 1959) -- valid
  Armatoplana robusta (Palombi, 1928) -- valid
  Armatoplana snadda (Marcus and Marcus, 1968) -- valid
  Armatoplana taurica (Jacubowa, 1909) -- valid
  Armatoplana tenuis (Palombi, 1936) -- valid
  Armatoplana vesiculata (Palombi, 1940) -- valid
  Armilla Livanov, 1961 -- valid
  Armilla armata (Sabussow, 1903) -- valid
  Armilla livanovi Kenk, 1974 -- invalid
  Armilla pardalina (Grube, 1872) -- valid
  Arrawarria Willems, Schockaert and Artois, 2006 -- valid
  Arrawarria inexpectata Willems, Schockaert and Artois, 2006 -- valid
  Arthurdendyus Jones, 1999 -- valid
  Arthurdendyus albidus Jones, 1999 -- valid
  Arthurdendyus australis (Dendy, 1895) -- valid
  Arthurdendyus latissimus (Dendy, 1896) -- valid
  Arthurdendyus testaceus (Hutton, 1880) -- valid
  Arthurdendyus triangulatus (Dendy, 1895) -- valid
  Artinga Marcus, 1948 -- valid
  Artinga evelinae Marcus, 1948 -- valid
  Artiocotylus Graff, 1896 -- invalid
  Artiocotylus africanus (Graff, 1899) -- invalid
  Artiocotylus caffrus (Jameson, 1907) -- invalid
  Artiocotylus cherangani de Beauchamp, 1936 -- invalid
  Artiocotylus cylindricus (de Beauchamp, 1913) -- invalid
  Artiocotylus flavescens (Jameson, 1907) -- invalid
  Artiocotylus fuscus (Moseley, 1877) -- invalid
  Artiocotylus hepaticarum (Jameson, 1907) -- invalid
  Artiocotylus macrothylax de Beauchamp, 1936 -- invalid
  Artiocotylus nigrescens (Mell, 1904) -- invalid
  Artiocotylus notabilis (Graff, 1899) -- invalid
  Artiocotylus notabilis angolensis de Beauchamp, 1951 -- invalid
  Artiocotylus speciosus Graff, 1896 -- invalid
  Artioposthia Graff, 1896 -- valid
  Artioposthia adelaidensis (Dendy, 1892) -- valid
  Artioposthia alfordensis (Dendy, 1896) -- invalid
  Artioposthia australis (Dendy, 1895) -- invalid
  Artioposthia carneyli Fyfe, 1953 -- invalid
  Artioposthia carnleyi Fyfe, 1953 -- invalid
  Artioposthia castanea Graff, 1899 -- invalid
  Artioposthia civis Cardale, 1941 -- valid
  Artioposthia cucullata (Dendy, 1896) -- invalid
  Artioposthia daemeli (Graff, 1899) -- invalid
  Artioposthia diemenensis (Dendy, 1894) -- valid
  Artioposthia dovei (Steel, 1900) -- valid
  Artioposthia exulans (Dendy, 1901) -- valid
  Artioposthia flavimarginata (Dendy, 1896) -- invalid
  Artioposthia fletcheri (Dendy, 1891) -- valid
  Artioposthia fletcheri borealis (Dendy, 1895) -- valid
  Artioposthia fletcheri fletcheri (Dendy, 1891) -- valid
  Artioposthia garveyi (Dendy, 1901) -- valid
  Artioposthia glandulosa Fyfe, 1956 -- valid
  Artioposthia graminicola (Steel, 1901) -- invalid
  Artioposthia gramnicola (Steel, 1901) -- invalid
  Artioposthia grubei Graff, 1899 -- invalid
  Artioposthia harrisoni (Wood, 1926) -- valid
  Artioposthia howesi (Dendy, 1901) -- valid
  Artioposthia howitti (Dendy, 1891) -- invalid
  Artioposthia howitti obsoleta (Dendy, 1892) -- invalid
  Artioposthia japonica Kaburaki, 1922 -- valid
  Artioposthia latissima (Dendy, 1896) -- invalid
  Artioposthia lucasi (Dendy, 1891) -- invalid
  Artioposthia mariae (Dendy, 1895) -- valid
  Artioposthia mortoni (Dendy, 1894) -- invalid
  Artioposthia nichollsi (Dendy, 1915) -- invalid
  Artioposthia parva (Steel, 1897) -- invalid
  Artioposthia polyadoides (Fyfe, 1956) -- valid
  Artioposthia regina (Dendy, 1892) -- invalid
  Artioposthia robusta (Steel, 1897) -- invalid
  Artioposthia scaphoidea (Steel, 1901) -- invalid
  Artioposthia subquadrangulata (Dendy, 1895) -- valid
  Artioposthia suteri (Dendy, 1896) -- valid
  Artioposthia testacea (Hutton, 1880) -- invalid
  Artioposthia triangulata (Dendy, 1895) -- invalid
  Ascidiophilla Newman, 2002 -- valid
  Ascidiophilla alba Newman, 2002 -- valid
  Ascoparia Sterrer, 1998 -- valid
  Ascoparia neglecta Sterrer, 1998 -- valid
  Ascoparia secunda Sterrer, 1998 -- valid
  Ascopariidae Sterrer, 1998 -- valid
  Ascophora Findenegg, 1924 -- valid
  Ascophora elegantissima Findenegg, 1924 -- valid
  Ascophora paradoxa Findenegg, 1924 -- valid
  Ascophorinae Findenegg, 1924 -- valid
  Asilomaria Karling, 1966 -- valid
  Asilomaria ampullata Karling, 1967 -- valid
  Asolenia Hyman, 1959 -- valid
  Asolenia deilogyna Hyman, 1959 -- valid
  Astacobdella Diesing, 1850 -- invalid
  Astacobdella chilensis (Moquin-Tandon, 1846) -- invalid
  Asthenoceros Laidlaw, 1903 -- valid
  Asthenoceros woodworthi Laidlaw, 1903 -- valid
  Astrotorhynchinae Luther, 1948 -- invalid
  Astrotorhynchus Graff, 1905 -- valid
  Astrotorhynchus bifidus (McIntosh, 1874) -- valid
  Astrotorhynchus bifidus bifidus (McIntosh, 1874) -- valid
  Astrotorhynchus bifidus regulatus Graff, 1905 -- valid
  Atioplanaria Kenk, 1936 -- invalid
  Atria Porfirieva, 1970 -- valid
  Atria kozhowi Porfirieva, 1970 -- valid
  Atriofronta Dörjes, 1968 -- valid
  Atriofronta polyvacuola Dörjes, 1968 -- valid
  Atrioplanaria de Beauchamp, 1932 -- invalid
  Atrioplanaria aquaebellae Bromley, 1983 -- invalid
  Atrioplanaria delamarei Gourbault, 1969 -- invalid
  Atrioplanaria morisii Benazzi and Gourbault, 1977 -- invalid
  Atrioplanaria notadena de Beauchamp, 1937 -- invalid
  Atrioplanaria opisthogona (Kenk, 1936) -- invalid
  Atrioplanaria prosorchis (Kenk, 1937) -- invalid
  Atrioplanaria racovitzai (de Beauchamp, 1928) -- invalid
  Aulopharynx Ehlers, 1972 -- valid
  Aulopharynx aestuarius Ehlers, 1972 -- valid
  Auriculifera Kulinitch, 1973 -- valid
  Auriculifera rectata Kulinitch, 1973 -- valid
  Austradenopharynx Willems, Artois, Backeljau and Schockaert, 2005 -- valid
  Austradenopharynx reynaertsi Willems, Artois, Backeljau and Schockaert, 2005 -- valid
  Australopacifica Ogren and Kawakatsu, 1991 -- valid
  Australopacifica adae (Dendy, 1891) -- invalid
  Australopacifica adae extralineata (Dendy, 1892) -- invalid
  Australopacifica adae fusca (Dendy, 1894) -- invalid
  Australopacifica albolineata (Steel, 1897) -- valid
  Australopacifica alfordensis (Dendy, 1896) -- valid
  Australopacifica antarctica (Dendy, 1909) -- valid
  Australopacifica arenicola (Steel, 1901) -- invalid
  Australopacifica atrata (Steel, 1897) -- invalid
  Australopacifica aucklandica (Dendy, 1901) -- invalid
  Australopacifica aurantia (Whitehouse, 1914) -- valid
  Australopacifica austiniana (Schröder, 1924) -- valid
  Australopacifica balfouri (Graff, 1899) -- invalid
  Australopacifica barringtonensis (Wood, 1926) -- invalid
  Australopacifica bicolor (Graff, 1899) -- invalid
  Australopacifica bimaculata (Kaburaki, 1922) -- invalid
  Australopacifica blomefieldi (Graff, 1899) -- valid
  Australopacifica buettneri (Graff, 1899) -- valid
  Australopacifica castanea (Graff, 1899) -- valid
  Australopacifica challengeri (Graff, 1899) -- valid
  Australopacifica chamissoniana (Schröder, 1924) -- valid
  Australopacifica citrina (Wood, 1926) -- invalid
  Australopacifica comitatis (Dendy, 1915) -- invalid
  Australopacifica cooperi (Dendy, 1901) -- valid
  Australopacifica coxii (Fletcher and Hamilton, 1888) -- invalid
  Australopacifica cucullata (Dendy, 1896) -- valid
  Australopacifica daemeli (Graff, 1899) -- invalid
  Australopacifica dakini (Dendy, 1915) -- invalid
  Australopacifica dendyi (Spencer, 1891) -- valid
  Australopacifica dietrichiana (Schröder, 1924) -- valid
  Australopacifica dubia (Dendy, 1892) -- invalid
  Australopacifica eschscholtziana (Schröder, 1924) -- valid
  Australopacifica fagicola (Dendy, 1901) -- valid
  Australopacifica flavilineata (Dendy, 1915) -- invalid
  Australopacifica flavimarginata (Dendy, 1896) -- valid
  Australopacifica flynni (Dendy, 1915) -- invalid
  Australopacifica frosti (Spencer, 1891) -- invalid
  Australopacifica fuscodorsalis (Steel, 1901) -- invalid
  Australopacifica gamblei (Graff, 1899) -- valid
  Australopacifica gelatinosa (Dendy, 1895) -- valid
  Australopacifica graminicola (Steel, 1901) -- valid
  Australopacifica greeni (Graff, 1899) -- valid
  Australopacifica gregoryana (Schröder, 1924) -- valid
  Australopacifica grubei (Graff, 1899) -- valid
  Australopacifica guentheri (Graff, 1899) -- valid
  Australopacifica hamiltoni (Dendy, 1895) -- valid
  Australopacifica hillii (Steel, 1897) -- invalid
  Australopacifica himalayensis (Whitehouse, 1919) -- valid
  Australopacifica hoggii (Dendy, 1891) -- valid
  Australopacifica howitti (Dendy, 1891) -- valid
  Australopacifica howitti howitti (Dendy, 1891) -- valid
  Australopacifica howitti obsoleta (Dendy, 1892) -- valid
  Australopacifica humberti (Graff, 1899) -- valid
  Australopacifica huttoni (Graff, 1899) -- valid
  Australopacifica ijimai (Graff, 1899) -- valid
  Australopacifica inflata (Graff, 1899) -- valid
  Australopacifica iris (Dendy, 1896) -- invalid
  Australopacifica jacksoniana (Dendy, 1896) -- valid
  Australopacifica korotneffi (Graff, 1899) -- valid
  Australopacifica kotzebueana (Schröder, 1924) -- valid
  Australopacifica krausi (Graff, 1899) -- valid
  Australopacifica laingii (Dendy, 1895) -- valid
  Australopacifica lapidicola (Stimpson, 1857) -- valid
  Australopacifica lateropunctata (Dendy, 1901) -- valid
  Australopacifica latissima (Dendy, 1896) -- invalid
  Australopacifica leichhardtiana (Schröder, 1924) -- valid
  Australopacifica leuckarti (Graff, 1899) -- valid
  Australopacifica lucasi (Dendy, 1891) -- valid
  Australopacifica lyra (Steel, 1900) -- invalid
  Australopacifica maculosa (Whitehouse, 1919) -- valid
  Australopacifica martensi (Graff, 1899) -- valid
  Australopacifica mediolineata (Dendy, 1891) -- invalid
  Australopacifica melanochroa (Steel, 1901) -- invalid
  Australopacifica meridionalis (Graff, 1899) -- valid
  Australopacifica metschnikoffi (Graff, 1899) -- valid
  Australopacifica minor (Dendy, 1892) -- invalid
  Australopacifica mmahoni (Dendy, 1891) -- invalid
  Australopacifica moebiusi (Graff, 1899) -- valid
  Australopacifica mortoni (Dendy, 1894) -- valid
  Australopacifica muelleriana (Schröder, 1924) -- valid
  Australopacifica nichollsi (Dendy, 1915) -- valid
  Australopacifica ornata (Fletcher and Hamilton, 1888) -- invalid
  Australopacifica parva (Steel, 1897) -- valid
  Australopacifica ponderosa (Steel, 1897) -- invalid
  Australopacifica pulverulenta (Graff, 1899) -- valid
  Australopacifica purpurea (Dendy, 1895) -- invalid
  Australopacifica quadrangulata (Dendy, 1891) -- invalid
  Australopacifica quinquelineata (Fletcher and Hamilton, 1888) -- invalid
  Australopacifica regina (Dendy, 1892) -- valid
  Australopacifica robusta (Steel, 1897) -- valid
  Australopacifica rotunda (Whitehouse, 1919) -- valid
  Australopacifica rouxiana (Schröder, 1924) -- valid
  Australopacifica sanguinea (Moseley, 1877) -- invalid
  Australopacifica sanguinea alba (Dendy, 1891) -- invalid
  Australopacifica sarasiniana (Schröder, 1924) -- valid
  Australopacifica scaphoidea (Steel, 1901) -- valid
  Australopacifica semoniana (Schröder, 1924) -- valid
  Australopacifica sowerbyi (Graff, 1899) -- valid
  Australopacifica spectabilis (Dendy, 1895) -- valid
  Australopacifica splendens (Dendy, 1895) -- valid
  Australopacifica striata (Whitehouse, 1919) -- valid
  Australopacifica subpallida (Hyman, 1939) -- valid
  Australopacifica subviridis (Moseley, 1877) -- valid
  Australopacifica sugdeni (Dendy, 1891) -- invalid
  Australopacifica sulphurea (Fletcher and Hamilton, 1888) -- invalid
  Australopacifica tasmaniana (Darwin, 1844) -- invalid
  Australopacifica tenuis (Dendy, 1895) -- invalid
  Australopacifica testacea (Hutton, 1880) -- invalid
  Australopacifica treubi (Graff, 1899) -- valid
  Australopacifica trifasciata (Steel, 1897) -- valid
  Australopacifica typhlops (Dendy, 1894) -- invalid
  Australopacifica variegata (Fletcher and Hamilton, 1888) -- invalid
  Australopacifica ventropunctata (Dendy, 1892) -- invalid
  Australopacifica virgata (Fletcher and Hamilton, 1888) -- invalid
  Australopacifica viridis (Fletcher and Hamilton, 1888) -- invalid
  Australopacifica walhallae (Dendy, 1891) -- valid
  Australopacifica warragulensis (Graff, 1899) -- valid
  Australopacifica wellingtoni (Dendy, 1892) -- invalid
  Australopacifica willeyi (Busson, 1903) -- valid
  Australopacifica zebra (Schröder, 1924) -- valid
  Australoplana Winsor, 1991 -- valid
  Australoplana alba (Dendy, 1891) -- valid
  Australoplana alba alba (Dendy, 1891) -- valid
  Australoplana alba roseolineata (Dendy, 1892) -- valid
  Australoplana minor (Dendy, 1892) -- valid
  Australoplana rubicunda (Fletcher and Hamilton, 1888) -- valid
  Australoplana sanguinea (Moseley, 1877) -- valid
  Australoplana sanguinea alba (Dendy, 1891) -- invalid
  Australoplana typhlops (Dendy, 1894) -- valid
  Austrodalyellia Hochberg and Cannon, 2002 -- valid
  Austrodalyellia ariena Hochberg and Cannon, 2002 -- valid
  Austromacrostomum Rieger, 1971 -- valid
  Austromacrostomum arumoidicornum Janssen, Vizoso, Schulte, Littlewood, Waeschenbach and Schärer, 2015 -- valid
  Austromacrostomum mortenseni (Marcus, 1950) -- valid
  Austrorhynchus Karling, 1952 -- valid
  Austrorhynchus antarcticus Artois, Vermin and Schockaert, 2000 -- valid
  Austrorhynchus artoisi Willems, Sandberg and Jondelius, 2007 -- valid
  Austrorhynchus biserratus Artois, Vermin and Schockaert, 2000 -- valid
  Austrorhynchus bruneti Karling, 1977 -- valid
  Austrorhynchus calcareus Karling, 1977 -- valid
  Austrorhynchus californicus Karling, 1977 -- valid
  Austrorhynchus elixus Marcus, 1954 -- invalid
  Austrorhynchus galapagoensis Artois and Schockaert, 1999 -- valid
  Austrorhynchus hawaiiensis Karling, 1977 -- valid
  Austrorhynchus karlingi Brunet, 1965 -- valid
  Austrorhynchus kerguelensis Artois and Tessens, 2008 -- valid
  Austrorhynchus magnificoides Artois, Vermin and Schockaert, 2000 -- valid
  Austrorhynchus magnificus Karling, 1952 -- valid
  Austrorhynchus maldivarum Karling, 1977 -- valid
  Austrorhynchus pacificus Karling, 1977 -- valid
  Austrorhynchus parapectatus Karling, 1977 -- valid
  Austrorhynchus pectatus Karling, 1952 -- valid
  Austrorhynchus pectatus Karling, Mack-Fira and Dörjes, 1972 -- invalid
  Austrorhynchus pectatus Brunet, 1965 -- invalid
  Austrorhynchus pectatus doppelt Karling, 1952 -- invalid
  Austrorhynchus pectatus einfach Karling, 1952 -- invalid
  Austrorhynchus pectatus magnificus Karling, 1952 -- invalid
  Austrorhynchus pectatus sporn Karling, 1952 -- invalid
  Austrorhynchus pectatus stachel Karling, 1952 -- invalid
  Austrorhynchus scoparius Brunet, 1965 -- valid
  Austrorhynchus spinosus Karling, 1977 -- valid
  Automolus Graff, 1882 -- invalid
  Automolus balanocephalus Böhmig, 1902 -- invalid
  Automolus hamatus (Jensen, 1878) -- invalid
  Automolus horridus Gamble, 1893 -- invalid
  Automolus morgiensis (Du Plessis, 1876) -- invalid
  Automolus ophiocephalus (Schmidt, 1861) -- invalid
  Automolus unipunctata (Fabricius, 1826) -- invalid
  Avagina Leiper, 1902 -- valid
  Avagina aurita Meixner, 1938 -- invalid
  Avagina glandulifera Westblad, 1953 -- valid
  Avagina incola Leiper, 1902 -- invalid
  Avagina marci Dörjes and Karling, 1975 -- valid
  Avagina polyvacuola Ehlers and Dörjes, 1979 -- valid
  Avagina sublitoralis Faubel, 1976 -- valid
  Avagina tenuissima (Westblad, 1946) -- invalid
  Avagina vivipara Hickman, 1956 -- valid
  Axia Ferguson, 1954 -- valid
  Axia Luther, 1955 -- invalid
  Axia gieysztori (Ferguson, 1939) -- valid
  Axia luetjohanni (Ax, 1952) -- invalid
  Axia remanei (Ax, 1952) -- invalid
  Axiola Luther, 1955 -- valid
  Axiola luetjohanni (Ax, 1952) -- valid
  Axiola remanei (Ax, 1952) -- valid
  Axiutelga Karling, 1980 -- valid
  Axiutelga aculeata (Ax, 1959) -- valid
  Baicalarctia Friedmann, 1926 -- valid
  Baicalarctia gula Friedmann, 1926 -- valid
  Baicalarctiidae Friedmann, 1926 -- invalid
  Baicalarctiinae Friedmann, 1926 -- valid
  Baicalellia Nasonov, 1930 -- valid
  Baicalellia albicauda Nasonov, 1930 -- valid
  Baicalellia anchoragensis Ax and Armonies, 1990 -- valid
  Baicalellia baicali Nasonov, 1930 -- valid
  Baicalellia baicali baicali Nasonov, 1930 -- valid
  Baicalellia baicali bicornis Nasonov, 1930 -- valid
  Baicalellia baicali fasciata Nasonov, 1930 -- valid
  Baicalellia brevituba (Luther, 1918) -- valid
  Baicalellia canadensis Ax and Armonies, 1987 -- valid
  Baicalellia evelinae Marcus, 1946 -- valid
  Baicalellia forcipifera Van Steenkiste, Volonterio, Schockaert and Artois, 2008 -- valid
  Baicalellia groenlandica Ax, 1995 -- valid
  Baicalellia maculata Nasonov, 1930 -- valid
  Baicalellia maculata coerulea Nasonov, 1930 -- valid
  Baicalellia maculata maculata Nasonov, 1930 -- valid
  Baicalellia maculata nigra Nasonov, 1930 -- valid
  Baicalellia nigrofasciata Nasonov, 1930 -- valid
  Baicalellia ocellata Nasonov, 1930 -- valid
  Baicalellia opaca (Sibiriakova, 1929) -- valid
  Baicalellia pellucida Nasonov, 1930 -- valid
  Baicalellia posieti Nasonov, 1930 -- valid
  Baicalellia rectis Ax, 2008 -- valid
  Baicalellia sewardensis Ax and Armonies, 1990 -- valid
  Baicalellia strelzovi Joffe and Selivanova, 1988 -- valid
  Baicalellia subsalina Ax, 1954 -- valid
  Baikalobia Kenk, 1930 -- valid
  Baikalobia copulatrix (Korotneff, 1912) -- valid
  Baikalobia guttata (Gerstfeldt, 1858) -- valid
  Baikalobia guttata guttata (Gerstfeldt, 1858) -- invalid
  Baikalobia guttata major Livanov, 1961 -- invalid
  Baikalobia pseudoguttata Porfirieva, Zaytseva and Timoshkin, 2010 -- valid
  Baikalobia raddei (Sabussow, 1911) -- valid
  Baikalobia variegata (Korotneff, 1912) -- valid
  Baikalocotylus Porfirieva, 1977 -- valid
  Baikalocotylus limnosus Porfirieva, 1977 -- valid
  Baikaloplana Berg, 1925 -- valid
  Baikaloplana valida (Korotneff, 1912) -- valid
  Baikaloplana valida bathybia Timoshkin and Porfirieva, 1989 -- valid
  Baikaloplana valida valida (Korotneff, 1912) -- valid
  Baikalotomesostoma Timoshkin and Lukhnev, 2010 -- valid
  Baikalotomesostoma stomi Timoshkin and Lukhnev, 2010 -- valid
  Balgetia Luther, 1962 -- valid
  Balgetia hyalina Karling, 1962 -- valid
  Balgetia pacifica Ax, Ax and Ehlers, 1979 -- valid
  Balgetia papii Kolasa, 1976 -- valid
  Balgetia semicirculifera Karling, 1962 -- valid
  Balliania Gourbault, 1978 -- valid
  Balliania thetisae Gourbault, 1978 -- valid
  Ballianiidae Gourbault, 1978 -- invalid
  Baltalimania Ax, 1959 -- valid
  Baltalimania agile (Jensen, 1878) -- invalid
  Baltalimania kosswigi Ax, 1959 -- valid
  Baltalimania macrospiriferum (Westblad, 1946) -- invalid
  Baltoplana Karling, 1949 -- valid
  Baltoplana bisphaera Jouk and DeVocht, 1989 -- valid
  Baltoplana magna Karling, 1949 -- valid
  Baltoplana valkanovi Ax, 1959 -- valid
  Barcoplana Bulnes, Faubel and Ponce de Leon, 2003 -- valid
  Barcoplana rochensis Bulnes, Faubel and Ponce de Leon, 2003 -- valid
  Barreirana Ogren and Kawakatsu, 1990 -- valid
  Barreirana barreirana (Riester, 1938) -- valid
  Barreirana cafusa (C. G. Froehlich, 1956) -- invalid
  Barreirana cassula (E. M. Froehlich, 1955) -- invalid
  Barreirana elegans (Darwin, 1844) -- invalid
  Barreirana zebroides (Riester, 1938) -- valid
  Bathymacrostominae Faubel, 1977 -- valid
  Bathymacrostomum Faubel, 1977 -- valid
  Bathymacrostomum spirale Faubel, 1977 -- valid
  Bdellasimilis Richardson, 1968 -- valid
  Bdellasimilis barwicki Richardson, 1968 -- valid
  Bdellocephala de Man, 1875 -- valid
  Bdellocephala angarensis (Gerstfeldt, 1858) -- valid
  Bdellocephala angarensis angarensis (Gerstfeldt, 1858) -- valid
  Bdellocephala angarensis bathyalis Timoshkin and Porfirieva, 1989 -- invalid
  Bdellocephala angarensis cotyloides Rubtzoff, 1928 -- valid
  Bdellocephala angarensis melanocinerea (Korotneff, 1912) -- invalid
  Bdellocephala angarensis olivacea (Korotneff, 1912) -- valid
  Bdellocephala angarensis subrufa (Korotneff, 1912) -- valid
  Bdellocephala annandalei Ijima and Kaburaki, 1916 -- valid
  Bdellocephala arcellaris (Korotneff, 1912) -- valid
  Bdellocephala baikalensis (Sabussow, 1903) -- valid
  Bdellocephala baikalensis baikalensis (Sabussow, 1903) -- valid
  Bdellocephala baikalensis compacta Livanov, 1962 -- valid
  Bdellocephala baikalensis subniger Livanov, 1962 -- valid
  Bdellocephala bathyalis Timoshkin and Porfirieva, 1989 -- valid
  Bdellocephala bicornis (Gmelin, 1791) -- valid
  Bdellocephala borealis Kawakatsu, 1978 -- valid
  Bdellocephala brunnea Ijima and Kaburaki, 1916 -- valid
  Bdellocephala cotyloides Rubtzoff, 1928 -- invalid
  Bdellocephala exotica (Hyman, 1953) -- valid
  Bdellocephala fusca (Pallas, 1774) -- invalid
  Bdellocephala grubiiformis (Sabussow, 1929) -- valid
  Bdellocephala hypervesiculina Livanov, 1962 -- valid
  Bdellocephala jezensis Ichikawa, 1954 -- invalid
  Bdellocephala kamtschatica Sabussow, 1929 -- invalid
  Bdellocephala mediobuccalis Sabussow, 1929 -- valid
  Bdellocephala melanocinerea (Korotneff, 1912) -- valid
  Bdellocephala parva Sabussow, 1936 -- valid
  Bdellocephala punctata (Pallas, 1774) -- valid
  Bdellocephala roseocula Timoshkin, Naumova and Novikova, 2004 -- valid
  Bdellocephala schneideri Komarek, 1930 -- valid
  Bdellocephala stellomaculata (Korotneff, 1912) -- valid
  Bdellocephala ushkaniensis Timoshkin, Naumova and Novikova, 2004 -- valid
  Bdelloura Leidy, 1851 -- valid
  Bdelloura candida (Girard, 1850) -- valid
  Bdelloura fusca (Dalyell, 1814) -- invalid
  Bdelloura longiceps (A. L. Dugès, 1830) -- invalid
  Bdelloura parasitica Leidy, 1851 -- invalid
  Bdelloura propinqua Wheeler, 1894 -- valid
  Bdelloura rustica Leidy, 1851 -- invalid
  Bdelloura wheeleri Wilhelmi, 1909 -- valid
  Bdellouridae Diesing, 1862 -- valid
  Bdellourinae Diesing, 1862 -- valid
  Bdellouroidea Diesing, 1862 -- valid
  Beauchampiola Luther, 1957 -- valid
  Beauchampiola arctica Ehlers and Franke, 1994 -- valid
  Beauchampiola canadiana Ax, 2008 -- valid
  Beauchampiola mackfirae Ax, 2008 -- valid
  Beauchampiola oculifera (de Beauchamp, 1927) -- valid
  Beauchampius Ogren and Kawakatsu, 1991 -- valid
  Beauchampius bangoianus (de Beauchamp, 1939) -- valid
  Beauchampius coonoorensis (de Beauchamp, 1930) -- valid
  Beauchampius crassus (de Beauchamp, 1939) -- valid
  Beauchampius dawydoffi (de Beauchamp, 1939) -- valid
  Beauchampius indosinicus (de Beauchamp, 1939) -- valid
  Beauchampius nilgiriensis (Whitehouse, 1919) -- valid
  Beauchampius sarasinorum (Graff, 1899) -- valid
  Beauchampius sondaica (Loman, 1890) -- valid
  Beauchampius trimeni (Graff, 1899) -- valid
  Beklemischeviella Luther, 1943 -- valid
  Beklemischeviella angustior Luther, 1943 -- valid
  Beklemischeviella brevistyla Beklemischev, 1953 -- valid
  Beklemischeviella contorta (Beklemischev, 1927) -- valid
  Bergendalia Laidlaw, 1903 -- valid
  Bergendalia anomala Laidlaw, 1903 -- valid
  Bergendalia diversa Yeri and Kaburaki, 1918 -- valid
  Bergendalia mirabilis Kato, 1938 -- invalid
  Bermudorhynchus Karling, 1978 -- valid
  Bermudorhynchus sterreri Karling, 1978 -- valid
  Bertiliella Rieger and Sterrer, 1975 -- valid
  Bertiliella bathycola Rieger and Sterrer, 1975 -- valid
  Bertiliellidae Rieger and Sterrer, 1975 -- valid
  Bicladinae Stunkard and Corliss, 1951 -- valid
  Bicladus Kaburaki, 1925 -- valid
  Bicladus metacrini Kaburaki, 1925 -- valid
  Bipaliinae Stimpson, 1857 -- valid
  Bipalium Stimpson, 1857 -- valid
  Bipalium adensameri Graff, 1899 -- valid
  Bipalium admarginatum de Beauchamp, 1933 -- valid
  Bipalium adventitium Hyman, 1943 -- valid
  Bipalium albocoeruleus (Bleeker, 1844) -- valid
  Bipalium alternans de Beauchamp, 1930 -- valid
  Bipalium andrewsi Whitehouse, 1919 -- invalid
  Bipalium bergendali (Graff, 1899) -- valid
  Bipalium bimaculatum Graff, 1882 -- valid
  Bipalium bleekeri (Graff, 1899) -- invalid
  Bipalium bohemica (Vejdovsky, 1895) -- invalid
  Bipalium brauni Mell, 1903 -- invalid
  Bipalium brunneus Whitehouse, 1919 -- invalid
  Bipalium böhmigi J. Müller, 1902 -- invalid
  Bipalium cantori (Wright, 1860) -- invalid
  Bipalium catenatum Graff, 1899 -- invalid
  Bipalium ceres Moseley, 1874 -- invalid
  Bipalium chhatarpurensis Chaurasia, 1988 -- valid
  Bipalium choristosperma de Beauchamp, 1925 -- valid
  Bipalium claparedei Graff, 1899 -- invalid
  Bipalium claviforme Loman, 1890 -- invalid
  Bipalium core de Beauchamp, 1930 -- invalid
  Bipalium costaricensis Hyman, 1939 -- valid
  Bipalium crassatrium de Beauchamp, 1939 -- valid
  Bipalium delicatum Whitehouse, 1914 -- invalid
  Bipalium dendrophilum (Schmarda, 1859) -- invalid
  Bipalium depressum Ritter-Zahony, 1905 -- invalid
  Bipalium diana Humbert and Claparède, 1862 -- invalid
  Bipalium dihangense Whitehouse, 1914 -- invalid
  Bipalium distinguendum J. Müller, 1907 -- valid
  Bipalium dodabettae de Beauchamp, 1930 -- invalid
  Bipalium dubium Loman, 1890 -- valid
  Bipalium ellioti Graff, 1899 -- invalid
  Bipalium engeli Hartog, 1968 -- invalid
  Bipalium ephippium Loman, 1890 -- invalid
  Bipalium everetti Houghton, 1870 -- invalid
  Bipalium everetti longitudinalis de Beauchamp, 1933 -- invalid
  Bipalium expeditionis Loman, 1895 -- invalid
  Bipalium falcatum Graff, 1899 -- invalid
  Bipalium fenestratum Graff, 1899 -- invalid
  Bipalium ferrugineoideum Sabussow, 1925 -- invalid
  Bipalium ferrugineum Graff, 1899 -- invalid
  Bipalium ferudpoorense (Wright, 1860) -- invalid
  Bipalium floweri Graff, 1899 -- invalid
  Bipalium fuligineum Geba, 1909 -- invalid
  Bipalium fulvum Kaburaki, 1922 -- invalid
  Bipalium fuscatum Stimpson, 1857 -- valid
  Bipalium fuscocephalum Kaburaki, 1922 -- invalid
  Bipalium fuscolineatum Kaburaki, 1922 -- valid
  Bipalium gebai Geba, 1909 -- invalid
  Bipalium gestroi Graff, 1894 -- valid
  Bipalium giganteum Whitehouse, 1914 -- invalid
  Bipalium girardi Graff, 1899 -- invalid
  Bipalium glandiantrum Kawakatsu, Sluys and Ogren, 2005 -- valid
  Bipalium glandulosa (de Beauchamp, 1925) -- valid
  Bipalium glaucum (Kaburaki, 1922) -- valid
  Bipalium gracilis (Loman, 1890) -- valid
  Bipalium graffi J. Müller, 1902 -- valid
  Bipalium grandidieri Mell, 1903 -- invalid
  Bipalium grayi Wright, 1860 -- invalid
  Bipalium gulliveri Graff, 1899 -- invalid
  Bipalium haasei Graff, 1899 -- invalid
  Bipalium haberlandti Graff, 1899 -- valid
  Bipalium hasseltii Loman, 1890 -- invalid
  Bipalium hildebrandi Graff, 1899 -- invalid
  Bipalium hilgendorfi (Graff, 1896) -- valid
  Bipalium houghtoni Moseley, 1874 -- invalid
  Bipalium indicum Whitehouse, 1919 -- invalid
  Bipalium interruptum Graff, 1899 -- valid
  Bipalium isabellinus (Geba, 1909) -- invalid
  Bipalium jalorense Laidlaw, 1903 -- invalid
  Bipalium janseni Graff, 1899 -- valid
  Bipalium javanum Loman, 1883 -- valid
  Bipalium kaburakii Kawakatsu, Sluys and Ogren, 2005 -- valid
  Bipalium katoi Kawakatsu, Sluys and Ogren, 2005 -- valid
  Bipalium kelleri Graff, 1899 -- invalid
  Bipalium keshavi Saxena, 1957 -- invalid
  Bipalium kewense Moseley, 1878 -- valid
  Bipalium kewense kewense Moseley, 1878 -- valid
  Bipalium kewense viridis Lehnert, 1891 -- valid
  Bipalium kirkpatricki Graff, 1899 -- invalid
  Bipalium kisoensis Kaburaki, 1922 -- valid
  Bipalium koreense Frieb, 1923 -- invalid
  Bipalium kraepelini (Ritter-Zahony, 1905) -- valid
  Bipalium kuhli Loman, 1890 -- invalid
  Bipalium layardi Graff, 1899 -- invalid
  Bipalium lehnerti Graff, 1899 -- invalid
  Bipalium lomani Graff, 1899 -- invalid
  Bipalium longicanali Sabussow, 1925 -- invalid
  Bipalium lunatum (Gray, 1831) -- invalid
  Bipalium maculatum Stimpson, 1857 -- invalid
  Bipalium madagascarensis Graff, 1899 -- invalid
  Bipalium manubriatum Sharp, 1891 -- valid
  Bipalium marenzelleri Mell, 1903 -- invalid
  Bipalium marginatum (Bleeker, 1844) -- valid
  Bipalium marginatum boehmigi Ritter-Zahony, 1905 -- valid
  Bipalium marginatum graffi Ritter-Zahony, 1905 -- valid
  Bipalium marginatum jansei Muller, 1907 -- invalid
  Bipalium marginatum marginatum (Bleeker, 1844) -- valid
  Bipalium megacephalum J. Müller, 1902 -- invalid
  Bipalium mjobergi de Beauchamp, 1925 -- valid
  Bipalium modiglianii Graff, 1894 -- invalid
  Bipalium molle (Graff, 1899) -- invalid
  Bipalium monolineatum Kaburaki, 1922 -- valid
  Bipalium moseleyi Loman, 1888 -- valid
  Bipalium multilineatum Makino and Shirasawa, 1983 -- invalid
  Bipalium muninense Kawakatsu, Sluys and Ogren, 2005 -- valid
  Bipalium murinum (Graff, 1899) -- invalid
  Bipalium myadenosium de Beauchamp, 1939 -- valid
  Bipalium natunense Meixner, 1906 -- invalid
  Bipalium negritorum Graff, 1899 -- invalid
  Bipalium negritorum palnisia de Beauchamp, 1930 -- invalid
  Bipalium niger (Ritter-Zahony, 1905) -- invalid
  Bipalium nigrilumbe Loman, 1890 -- invalid
  Bipalium nigrum (Ritter-Zahony, 1905) -- valid
  Bipalium nobile Kawakatsu and Makino, 1982 -- valid
  Bipalium ocellatum Graff, 1899 -- invalid
  Bipalium ochroleucum Kaburaki, 1922 -- valid
  Bipalium olivaceps Geba, 1909 -- invalid
  Bipalium penangense Kawakatsu, 1986 -- invalid
  Bipalium pennsylvanicum Ogren, 1987 -- valid
  Bipalium penrissenense de Beauchamp, 1925 -- invalid
  Bipalium penrissenicum Kawakatsu, Ogren and E. M. Froehlich, 1998 -- valid
  Bipalium penzigi J. Müller, 1902 -- valid
  Bipalium penzigi alternans de Beauchamp, 1930 -- invalid
  Bipalium persephone de Beauchamp, 1939 -- valid
  Bipalium phebe Humbert and Claparède, 1862 -- invalid
  Bipalium phebe transversefasciatum J. Müller, 1902 -- invalid
  Bipalium piceum Graff, 1899 -- invalid
  Bipalium pictum Geba, 1909 -- invalid
  Bipalium poiense de Beauchamp, 1925 -- valid
  Bipalium proserpina Humbert and Claparède, 1862 -- invalid
  Bipalium pseudophallicum de Beauchamp, 1925 -- invalid
  Bipalium quadricinctum Loman, 1890 -- invalid
  Bipalium rauchi Graff, 1899 -- invalid
  Bipalium ravenelae (Graff, 1899) -- invalid
  Bipalium richtersi (Graff, 1899) -- invalid
  Bipalium ridleyi Graff, 1899 -- invalid
  Bipalium rigaudi Graff, 1894 -- valid
  Bipalium robiginosum Graff, 1899 -- valid
  Bipalium roonwali Ramakrishna and Chauhan, 1962 -- invalid
  Bipalium rotungense Whitehouse, 1914 -- invalid
  Bipalium ruteofulvum Kaburaki, 1922 -- invalid
  Bipalium salvini Graff, 1899 -- invalid
  Bipalium sarasini J. Müller, 1907 -- invalid
  Bipalium semperi (Graff, 1899) -- valid
  Bipalium sexcinctum Loman, 1890 -- invalid
  Bipalium shipleyi Graff, 1899 -- invalid
  Bipalium sikorai (Graff, 1899) -- invalid
  Bipalium simplex Graff, 1899 -- invalid
  Bipalium simrothi Loman, 1895 -- valid
  Bipalium smithi Graff, 1899 -- invalid
  Bipalium solmsi Graff, 1899 -- invalid
  Bipalium somii Chaurasia, 1981 -- invalid
  Bipalium sordidum Whitehouse, 1914 -- invalid
  Bipalium splendens Whitehouse, 1919 -- invalid
  Bipalium steindachneri Graff, 1899 -- invalid
  Bipalium stimpsoni Diesing, 1862 -- invalid
  Bipalium strubelli Graff, 1899 -- valid
  Bipalium subboreale Sabussow, 1925 -- invalid
  Bipalium sudzukii Kawakatsu, 1987 -- valid
  Bipalium sumatrense Loman, 1883 -- invalid
  Bipalium superbum Graff, 1899 -- invalid
  Bipalium sylvestre Whitehouse, 1919 -- invalid
  Bipalium tamatavensis (Graff, 1899) -- invalid
  Bipalium tau Mell, 1903 -- invalid
  Bipalium tennenti Diesing, 1862 -- invalid
  Bipalium tetsuyai Kawakatsu, Sluys and Ogren, 2005 -- valid
  Bipalium transversefasciatum J. Müller, 1907 -- invalid
  Bipalium trifuscostriatum Kaburaki, 1922 -- invalid
  Bipalium trilineatum Stimpson, 1857 -- invalid
  Bipalium tripartitum Graff, 1899 -- invalid
  Bipalium umbrinum (Geba, 1909) -- invalid
  Bipalium unicolor Moseley, 1877 -- invalid
  Bipalium univittatum Grube, 1866 -- invalid
  Bipalium univittatum suboreala Sabussow, 1925 -- invalid
  Bipalium univittatum univittatum Grube, 1866 -- invalid
  Bipalium vagum Jones and Sterrer, 2005 -- valid
  Bipalium venosum Kaburaki, 1922 -- invalid
  Bipalium vinosum Kaburaki, 1925 -- invalid
  Bipalium virchowi (Graff, 1899) -- invalid
  Bipalium virgatum Stimpson, 1857 -- invalid
  Bipalium virile J. Müller, 1902 -- valid
  Bipalium vittatum Loman, 1888 -- invalid
  Bipalium voigti Graff, 1899 -- invalid
  Bipalium weberi Loman, 1890 -- invalid
  Bipalium weismanni Ritter-Zahony, 1905 -- valid
  Bipalium whitehousei Ogren and Kawakatsu, 1987 -- invalid
  Bipalium wiesneri Graff, 1899 -- valid
  Bipalium woodworthi Graff, 1899 -- invalid
  Bipalium wrighti Graff, 1899 -- invalid
  Blennorhynchus Meixner, 1938 -- invalid
  Blennorhynchus egregius Meixner, 1938 -- invalid
  Bockia Reisinger, 1924 -- valid
  Bockia deses Reisinger, 1924 -- valid
  Bogga Grau and Sluys, 2012 -- valid
  Bogga bogotensis (Graff, 1899) -- valid
  Bohmigia Sabussow, 1899 -- invalid
  Bohmigia maris-alba Sabussow, 1899 -- invalid
  Bohmigia marisalba Sabussow, 1899 -- invalid
  Bolbodendrocoelum de Beauchamp, 1932 -- invalid
  Bolbodendrocoelum agile (de Beauchamp, 1932) -- invalid
  Boninia Bock, 1923 -- valid
  Boninia antillarum (Hyman, 1955) -- valid
  Boninia divae Marcus and Marcus, 1968 -- valid
  Boninia mirabilis Bock, 1923 -- valid
  Boninia neotethydis Curini-Galletti and Campus, 2007 -- valid
  Boniniidae Bock, 1923 -- valid
  Bopsula Marcus, 1946 -- valid
  Bopsula evelinae Marcus, 1946 -- valid
  Boreocelis Westblad, 1952 -- valid
  Boreocelis filicauda Westblad, 1952 -- valid
  Boreocelis urodasyoides Ax, 1963 -- valid
  Bothriomolus Hallez, 1909 -- valid
  Bothriomolus balticus Meixner, 1938 -- valid
  Bothriomolus constrictus Hallez, 1909 -- valid
  Bothrioplana Braun, 1881 -- valid
  Bothrioplana alacris Sekera, 1889 -- invalid
  Bothrioplana bohemica Vejdovsky, 1895 -- invalid
  Bothrioplana brauni Zacharias, 1886 -- invalid
  Bothrioplana dorpatensis Braun, 1881 -- invalid
  Bothrioplana semperi Braun, 1881 -- valid
  Bothrioplana silesiaca Zacharias, 1886 -- invalid
  Bothrioplanida Sopott-Ehlers, 1985 -- invalid
  Bothrioplanidae Vejdovsky, 1895 -- valid
  Bothromesostoma Braun, 1885 -- valid
  Bothromesostoma essenii Braun, 1885 -- valid
  Bothromesostoma evelinae Marcus, 1946 -- valid
  Bothromesostoma lineatum Braun, 1885 -- invalid
  Bothromesostoma marginatum Braun, 1885 -- invalid
  Bothromesostoma personatum (Schmidt, 1848) -- valid
  Bothromesostoma primitivum Sabussow, 1929 -- invalid
  Bothromesostoma truncatum Beklemischev, 1921 -- invalid
  Brachypea Antonius, 1968 -- valid
  Brachypea kenoma Antonius, 1968 -- valid
  Brachyposthia Brandtner, 1934 -- invalid
  Brachyposthia cuticulata (Brandtner, 1934) -- invalid
  Brachyrhynchoides Artois and Schockaert, 2013 -- valid
  Brachyrhynchoides acutus (Artois and Schockaert, 2013) -- valid
  Brachyrhynchoides oosterlyncki (Willems, Reygel and Artois, 2013) -- valid
  Brachyrhynchoides triplostylis (Artois and Schockaert, 2013) -- valid
  Brachyrhynchus Artois and Schockaert, 2013 -- invalid
  Brachyrhynchus acutus Artois and Schockaert, 2013 -- invalid
  Brachyrhynchus oosterlyncki Willems, Reygel and Artois, 2013 -- invalid
  Brachyrhynchus triplostylis Artois and Schockaert, 2013 -- invalid
  Bradburia Faubel, Blome and Cannon, 1994 -- valid
  Bradburia australiensis Faubel, Blome and Cannon, 1994 -- valid
  Bradburia miraculicis (Schmidt and Sopott-Ehlers, 1976) -- valid
  Bradynectes Rieger, 1971 -- valid
  Bradynectes carolinaensis Janssen, Vizoso, Schulte, Littlewood, Waeschenbach and Schärer, 2015 -- valid
  Bradynectes robinhoodensis Janssen, Vizoso, Schulte, Littlewood, Waeschenbach and Schärer, 2015 -- valid
  Bradynectes scilliensis Faubel and Warwick, 2005 -- valid
  Bradynectes sterreri Rieger, 1971 -- valid
  Bradynectes syltensis Faubel and Warwick, 2005 -- valid
  Branchobdella Moquin-Tandon, 1846 -- invalid
  Branchobdella chilensis Moquin-Tandon, 1846 -- invalid
  Brederveldia van der Velde and van de Winkel, 1975 -- valid
  Brederveldia bidentata van der Velde and van de Winkel, 1975 -- valid
  Brederweldia Karling, 1978 -- invalid
  Bresslauilla Reisinger, 1929 -- valid
  Bresslauilla relicta Reisinger, 1929 -- valid
  Bresslauillinae Bresslau, 1933 -- valid
  Brinkmanniella Luther, 1943 -- valid
  Brinkmanniella augusti Marcus, 1951 -- valid
  Brinkmanniella australiensis Willems, Artois, Vermin, Backeljau and Schockaert, 2004 -- valid
  Brinkmanniella falklandica Westblad, 1952 -- invalid
  Brinkmanniella macrostomoides Luther, 1948 -- valid
  Brinkmanniella microps Schockaert and Martens, 1985 -- valid
  Brinkmanniella obtusa Luther, 1943 -- valid
  Brinkmanniella palmata Karling, 1986 -- valid
  Brinkmanniella procerastyla Ehlers, 1974 -- valid
  Brinkmanniellinae Luther, 1948 -- valid
  Brunetia Karling, 1980 -- valid
  Brunetia camarguensis (Brunet, 1965) -- valid
  Brunetorhynchus Schockaert et al., 2014 -- valid
  Brunetorhynchus canariensis Schockaert, Janssen and Artois, 2014 -- valid
  Brunetorhynchus cannoni Schockaert and Artois, 2014 -- valid
  Brunetorhynchus complicatus Schockaert and Artois, 2014 -- valid
  Brunetorhynchus deconincki Schockaert, Martens and Artois, 2014 -- valid
  Brunetorhynchus dubius Artois and Schockaert, 2014 -- valid
  Brunetorhynchus microstylis Schockaert, Revis and Artois, 2014 -- valid
  Bryoplana Van Steenkiste, Davison and Artois, 2010 -- valid
  Bryoplana xerophila Van Steenkiste, Davison and Artois, 2010 -- valid
  Bubalocerus Matjasic, 1958 -- valid
  Bubalocerus preineri Matjasic, 1958 -- valid
  Bubalocerus undulatus Matjasic, 1990 -- valid
  Bulaceros Newman and Cannon, 1996 -- valid
  Bulaceros porcellanus Newman and Cannon, 1996 -- valid
  Bulbotoplana Ax, 1956 -- valid
  Bulbotoplana acephala Ax, 1956 -- valid
  Bulbotoplana hearnsi Miller and Faubel, 2003 -- valid
  Bulbotoplaninae Ax, 1956 -- valid
  Bursosaphia Dörjes, 1968 -- valid
  Bursosaphia baltalimaniaformis Dörjes, 1968 -- valid
  Byrsophlebidae Graff, 1905 -- valid
  Byrsophlebs Jensen, 1878 -- valid
  Byrsophlebs caligulachaena (Ehlers and Ehlers, 1981) -- valid
  Byrsophlebs delamarei (Ax, 1956) -- valid
  Byrsophlebs dubia (Ax, 1956) -- valid
  Byrsophlebs geniculata Beklemischev, 1927 -- invalid
  Byrsophlebs graffi Jensen, 1878 -- valid
  Byrsophlebs intermedia Graff, 1882 -- invalid
  Byrsophlebs lutheri (Marcus, 1952) -- valid
  Byrsophlebs nana (Laidlaw, 1902) -- invalid
  Byrsophlebs simplex (Ax, 1959) -- valid
  Byrsophlebs uncinata (Ax, 1959) -- valid
  Caenoplana Moseley, 1877 -- valid
  Caenoplana alba (Dendy, 1891) -- invalid
  Caenoplana alba roseolineata (Dendy, 1892) -- invalid
  Caenoplana albolineata (Steel, 1897) -- invalid
  Caenoplana barringtonensis (Wood, 1926) -- valid
  Caenoplana bicolor (Graff, 1899) -- valid
  Caenoplana chapmani Ogren and Kawakatsu, 1988 -- invalid
  Caenoplana citrina (Wood, 1926) -- valid
  Caenoplana coerulea Moseley, 1877 -- valid
  Caenoplana coerulea coerulea Moseley, 1877 -- valid
  Caenoplana coerulea vaga (Hyman, 1943) -- valid
  Caenoplana coxii (Fletcher and Hamilton, 1888) -- invalid
  Caenoplana daemeli (Graff, 1899) -- valid
  Caenoplana dendyi (Spencer, 1891) -- invalid
  Caenoplana dubia (Dendy, 1892) -- valid
  Caenoplana graffi (C. G. Froehlich, 1959) -- invalid
  Caenoplana hillii (Steel, 1897) -- valid
  Caenoplana hoggii (Dendy, 1891) -- invalid
  Caenoplana micholitzi (Graff, 1899) -- valid
  Caenoplana munda (Fletcher and Hamilton, 1888) -- valid
  Caenoplana ponderosa (Steel, 1897) -- valid
  Caenoplana purpurea (Dendy, 1895) -- valid
  Caenoplana sanguinea Moseley, 1877 -- invalid
  Caenoplana sanguinea alba (Dendy, 1891) -- invalid
  Caenoplana sieboldi (Graff, 1899) -- valid
  Caenoplana spenceri (Dendy, 1889) -- valid
  Caenoplana steenstrupi (Krsmanovie, 1898) -- valid
  Caenoplana steinboecki (Haslauer-Gamisch, 1982) -- valid
  Caenoplana subviridis (Moseley, 1877) -- invalid
  Caenoplana sulphurea (Fletcher and Hamilton, 1888) -- valid
  Caenoplana tenuis (Dendy, 1895) -- valid
  Caenoplana variegata (Fletcher and Hamilton, 1888) -- valid
  Caenoplana viridis (Fletcher and Hamilton, 1888) -- valid
  Caenoplana walhallae (Dendy, 1891) -- invalid
  Caenoplaninae Ogren and Kawakatsu, 1991 -- invalid
  Caenoplanini Ogren and Kawakatsu, 1991 -- valid
  Callioplana Stimpson, 1857 -- valid
  Callioplana evelinae Marcus, 1954 -- valid
  Callioplana marginata Stimpson, 1857 -- valid
  Callioplanidae Hyman, 1953 -- valid
  Calviria Martens and Curini-Galletti, 1993 -- valid
  Calviria banyulensis Martens and Curini-Galletti, 1993 -- valid
  Calviria solaris Martens and Curini-Galletti, 1993 -- valid
  Calviria sublittoralis Martens and Curini-Galletti, 1993 -- valid
  Calviriidae Martens and Curini-Galletti, 1993 -- valid
  Camerata Vila-Farré, Sluys, D'Aniello, Cebrià, Ferrer and Romero, 2009 -- valid
  Camerata robusta Vila-Farré, Sluys, D'Aniello, Cebrià, Ferrer and Romero, 2009 -- valid
  Candimba Marcus, 1949 -- invalid
  Candimba divae Marcus, 1949 -- invalid
  Candimba rabita Marcus and Marcus, 1968 -- invalid
  Candimboides Prudhoe, 1982 -- valid
  Candimboides cuneiformis Prudhoe, 1982 -- valid
  Candimboides rabita (Marcus and Marcus, 1968) -- invalid
  Candimboididae Faubel, 1983 -- valid
  Canetellia Ax, 1956 -- valid
  Canetellia beauchampi Ax, 1956 -- valid
  Canetellia nana Ax, 2008 -- valid
  Cannona Faubel and Rohde, 1998 -- valid
  Cannona woolgoolgae Faubel and Rohde, 1998 -- valid
  Cannoninae Faubel and Rohde, 1998 -- valid
  Carcharodognathus Evdonin, 1977 -- valid
  Carcharodognathus stilofer (Schilke, 1970) -- valid
  Carcharodopharyngidae Bresslau, 1928 -- invalid
  Carcharodopharynx Reisinger, 1924 -- valid
  Carcharodopharynx arcanus (Reisinger, 1924) -- valid
  Carcharodopharynx schlitzensis Houben, Schwank and Artois, 2015 -- valid
  Carcharodorhynchus Meixner, 1938 -- valid
  Carcharodorhynchus ambronensis Schilke, 1970 -- valid
  Carcharodorhynchus arista Noldt and Hoxhold, 1984 -- valid
  Carcharodorhynchus brasiliensis Reygel, Schockaert and Artois, 2014 -- valid
  Carcharodorhynchus flavidus Brunet, 1967 -- valid
  Carcharodorhynchus galapagoensis Noldt and Hoxhold, 1984 -- valid
  Carcharodorhynchus infundibulatus Brunet, 1970 -- valid
  Carcharodorhynchus involutus Jouk and DeVocht, 1989 -- valid
  Carcharodorhynchus isolatus Schilke, 1970 -- valid
  Carcharodorhynchus listensis Schilke, 1970 -- valid
  Carcharodorhynchus longicirrus Noldt and Hoxhold, 1984 -- valid
  Carcharodorhynchus multidentatus Brunet, 1979 -- valid
  Carcharodorhynchus polyorchis L'Hardy, 1963 -- valid
  Carcharodorhynchus subterraneus Ax, 1951 -- valid
  Carcharodorhynchus subterraneus Fize, 1963 -- invalid
  Carcharodorhynchus tabulaeferus Noldt and Hoxhold, 1984 -- valid
  Carcharodorhynchus tenuis Brunet, 1979 -- valid
  Carcharodorhynchus viridis Van Steenkiste, Volonterio, Schockaert and Artois, 2008 -- valid
  Carcharodorhynchus worsaae Reygel, Janssen and Artois, 2014 -- valid
  Carenoceraeus Schmarda, 1859 -- invalid
  Carenoceraeus oceanica (Darwin, 1844) -- invalid
  Carenscoilia Sopott, 1972 -- valid
  Carenscoilia bidentata Sopott, 1972 -- valid
  Carenscoilia biforamen Sopott, 1972 -- valid
  Carenscoilia monostyla Ax and Ax, 1974 -- valid
  Caridinicola Annandale, 1912 -- valid
  Caridinicola ceylonica Monticelli, 1914 -- valid
  Caridinicola indica Annandale, 1912 -- invalid
  Caridinicola japonica Matjasic, 1990 -- valid
  Caridinicola platei Fernando, 1952 -- valid
  Caridinicola platei holocotyla Fernando, 1952 -- valid
  Caridinicola platei platei Fernando, 1952 -- valid
  Caridinicola platei schizocotyla Fernando, 1952 -- valid
  Caridinicola sinica Matjasic, 1990 -- invalid
  Carolinorhynchus Noldt, 1987 -- valid
  Carolinorhynchus follybeachensis Noldt, 1987 -- valid
  Caspioplana Sabussow, 1951 -- valid
  Caspioplana pharyngosa Sabussow, 1951 -- valid
  Castrada Schmidt, 1861 -- valid
  Castrada (Castrada) Schmidt, 1862 -- valid
  Castrada (Castradella) Nasonov, 1926 -- valid
  Castrada acuta Braun, 1885 -- invalid
  Castrada affinis Hofsten, 1907 -- valid
  Castrada agilis Dorner, 1902 -- invalid
  Castrada andreja Nasonov, 1919 -- invalid
  Castrada annebergensis Luther, 1946 -- valid
  Castrada anopla Sibiriakova, 1929 -- valid
  Castrada armata (Fuhrmann, 1894) -- valid
  Castrada baicalensis Nasonov, 1935 -- valid
  Castrada baldi (Steinböck, 1949) -- valid
  Castrada beklemischevi Papi, 1959 -- valid
  Castrada belennensis Gamo and Schwank, 1987 -- valid
  Castrada biacantha Noreña, Eitam and Blaustein, 2008 -- valid
  Castrada borealis Steinböck, 1931 -- valid
  Castrada borealis borealis Steinböck, 1931 -- valid
  Castrada borealis hagaensis Luther, 1963 -- valid
  Castrada brevispina Papi, 1959 -- valid
  Castrada chlorea Braun, 1885 -- valid
  Castrada chodorowskii Kolasa, 1979 -- valid
  Castrada cristatispinosa Papi, 1951 -- valid
  Castrada cuenoti (Dörler, 1900) -- invalid
  Castrada ejde Steinböck, 1931 -- valid
  Castrada flavida (Graff, 1882) -- valid
  Castrada fuhrmanni (Volz, 1898) -- invalid
  Castrada gladiata (Schwank, 1980) -- valid
  Castrada granea Braun, 1885 -- valid
  Castrada granea andreja Nasonov, 1919 -- valid
  Castrada granea granea Braun, 1885 -- valid
  Castrada groenlandica Steinböck and Lanser, 1932 -- invalid
  Castrada hofmanni Braun, 1885 -- valid
  Castrada horrida Schmidt, 1861 -- valid
  Castrada horrida viridis Volz, 1898 -- invalid
  Castrada howerlana Gieysztor and Szynal, 1939 -- valid
  Castrada inermis Hofsten, 1911 -- valid
  Castrada infernalis Papi, 1951 -- valid
  Castrada instructa Hofsten, 1907 -- valid
  Castrada intermedia (Volz, 1898) -- valid
  Castrada jenseni Steinböck and Lanser, 1932 -- invalid
  Castrada lanceola (Braun, 1885) -- valid
  Castrada libidinosa Hofsten, 1916 -- valid
  Castrada longibursa Steinböck and Lanser, 1932 -- invalid
  Castrada luteola Hofsten, 1907 -- valid
  Castrada luteola luteola Hofsten, 1907 -- valid
  Castrada luteola luteoloides Luther, 1963 -- valid
  Castrada lutheri Kepner, Stirewalt and Ferguson, 1939 -- valid
  Castrada mamkaevi Korgina, 2001 -- valid
  Castrada montana Papi, 1959 -- valid
  Castrada morchella Schwank, 1980 -- valid
  Castrada moroderi Gieysztor, 1931 -- invalid
  Castrada multispina Noreña, Eitam and Blaustein, 2008 -- valid
  Castrada neocomensis Volz, 1898 -- valid
  Castrada nigropontica Nasonov, 1919 -- valid
  Castrada noemiae Papi, 1951 -- valid
  Castrada ochridense An der Lan, 1939 -- valid
  Castrada ophiocephala Steinböck, 1931 -- valid
  Castrada orloviensis Nasonov, 1919 -- valid
  Castrada otophthalma Plotnikow, 1906 -- invalid
  Castrada papii Luther, 1963 -- valid
  Castrada papii laponica Luther, 1963 -- valid
  Castrada papii papii Luther, 1963 -- valid
  Castrada paradisea Van Steenkiste, Tessens, Krznaric and Artois, 2011 -- valid
  Castrada pellucida Braun, 1885 -- valid
  Castrada perspicua (Fuhrmann, 1894) -- valid
  Castrada purgatorialis Van Steenkiste, Tessens, Krznaric and Artois, 2011 -- valid
  Castrada quadridentata Hofsten, 1907 -- valid
  Castrada quadrioculata (Vejdovsky, 1895) -- invalid
  Castrada radiata (O. F. Müller, 1773) -- invalid
  Castrada rhaetica Hofsten, 1911 -- valid
  Castrada segne (Fuhrmann, 1894) -- invalid
  Castrada segne fennica Nasonov, 1917 -- invalid
  Castrada sibirjakovae Rogozin, 1995 -- valid
  Castrada sphagnetorum Luther, 1904 -- valid
  Castrada sphagni Sekera, 1906 -- invalid
  Castrada spinulosa Hofsten, 1907 -- valid
  Castrada stagnorum Luther, 1904 -- valid
  Castrada stagnorum angustibursa Steinböck and Lanser, 1932 -- invalid
  Castrada stagnorum stagnorum Luther, 1904 -- valid
  Castrada subsalsa Luther, 1946 -- valid
  Castrada tatarica Nasonov, 1924 -- valid
  Castrada torrenticola Gieysztor and Szynal, 1939 -- valid
  Castrada triacetabula Heitkamp, 1982 -- valid
  Castrada tripeti (Volz, 1898) -- valid
  Castrada trispina Willems, Artois, Vermin, Backeljau and Schockaert, 2005 -- valid
  Castrada unidentata An der Lan, 1939 -- valid
  Castrada variodentata Gieysztor, 1929 -- valid
  Castrada viridis Volz, 1898 -- valid
  Castrada visibilis Sibiriakova, 1929 -- valid
  Castrella Fuhrmann, 1900 -- valid
  Castrella (Castrella) Luther, 1955 -- valid
  Castrella (Nasonoviella) Luther, 1955 -- valid
  Castrella agilis Fuhrmann, 1900 -- invalid
  Castrella alba Luther, 1955 -- valid
  Castrella bardeaui (Steinböck, 1926) -- invalid
  Castrella bologowiensis Plotnikow, 1906 -- invalid
  Castrella cylindrica Riedel, 1932 -- valid
  Castrella graffi Hayes, 1945 -- valid
  Castrella groenlandica Riedel, 1932 -- valid
  Castrella lutheri (Nasonov, 1917) -- valid
  Castrella marginatum (Leidy, 1847) -- invalid
  Castrella obscura (Plotnikow, 1905) -- invalid
  Castrella pinguis (Silliman, 1884) -- valid
  Castrella quadrioculata (Vejdovsky, 1895) -- invalid
  Castrella serotina Dorner, 1902 -- invalid
  Castrella truncata (Abildgaard, 1789) -- valid
  Castrella truncata Kepner and Gilbert, 1931 -- invalid
  Castrella trunquata Hofsten, 1907 -- invalid
  Castrella vernalis Beklemischev, 1921 -- valid
  Catenula A. L. Dugès, 1832 -- valid
  Catenula alitha Marcus, 1945 -- valid
  Catenula bina Schmarda, 1859 -- invalid
  Catenula confusa Nuttycombe, 1956 -- valid
  Catenula evelinae (Marcus, 1945) -- valid
  Catenula gesserensis (O. F. Müller, 1784) -- valid
  Catenula gracilis (Leidy, 1851) -- invalid
  Catenula heteroclita (Fabricius, 1820) -- invalid
  Catenula lemnae A. L. Dugès, 1832 -- valid
  Catenula leptocephala Nuttycombe, 1956 -- valid
  Catenula leuca Marcus, 1945 -- valid
  Catenula macrura Marcus, 1945 -- valid
  Catenula pygmaea Reisinger, 1924 -- invalid
  Catenula quaterna Schmarda, 1859 -- valid
  Catenula sawayai (Marcus, 1945) -- valid
  Catenula sekerai de Beauchamp, 1919 -- valid
  Catenula turgida (Zacharias, 1902) -- valid
  Catenula virginia Kepner and Carter, 1930 -- valid
  Catenulida Meixner, 1924 -- valid
  Catenulidae Graff, 1905 -- valid
  Catesthia Leidy, 1851 -- invalid
  Catesthia stellata-maculata Leidy, 1851 -- invalid
  Cavernicola Sluys, 1990 -- invalid
  Celidotus Diesing, 1862 -- invalid
  Celidotus anguilla (Schmidt, 1857) -- invalid
  Celidotus bipunctata (Leydig, 1854) -- invalid
  Celidotus venenosus (Schmidt, 1852) -- invalid
  Centrostomum Diesing, 1859 -- valid
  Centrostomum bilobatum (Leuckart, 1828) -- invalid
  Centrostomum dubium Schmarda, 1859 -- invalid
  Centrostomum gigas (Schmarda, 1859) -- invalid
  Centrostomum incisum (Darwin, 1844) -- valid
  Centrostomum jaltense Czerniavsky, 1881 -- invalid
  Centrostomum lichenoides (Mertens, 1833) -- invalid
  Centrostomum mertensii Claparède, 1861 -- invalid
  Centrostomum ocellatum (Kelaart, 1858) -- valid
  Centrostomum polycyclium Schmarda, 1859 -- invalid
  Centrostomum polysorum Schmarda, 1859 -- invalid
  Centrostomum punctatum (Kelaart, 1858) -- valid
  Centrostomum taenium Schmarda, 1859 -- invalid
  Centrovarioplana Westblad, 1952 -- valid
  Centrovarioplana tenuis Westblad, 1952 -- valid
  Centrovarioplanidae Westblad, 1952 -- valid
  Cephaloflexa Carbayo and Leal-Zanchet, 2003 -- valid
  Cephaloflexa araucariana Carbayo and Leal-Zanchet, 2003 -- valid
  Cephaloflexa bergi (Graff, 1899) -- valid
  Cephaloflexa nataliae (C. G. Froehlich, 1959) -- valid
  Cephalolepta Stimpson, 1857 -- invalid
  Cephalolepta macrostomum (Darwin, 1844) -- invalid
  Cephalopharynginae Hochberg, 2004 -- valid
  Cephalopharynx Hochberg, 2004 -- valid
  Cephalopharynx cannoni Hochberg, 2004 -- valid
  Ceratopera Hartog, 1964 -- valid
  Ceratopera axi (Riedl, 1954) -- valid
  Ceratopera bermudensis Karling, 1986 -- valid
  Ceratopera bifida Ehlers and Ax, 1974 -- invalid
  Ceratopera ehlersi Karling, 1986 -- valid
  Ceratopera gracilis (Graff, 1882) -- valid
  Ceratopera levinseni Hartog, 1964 -- valid
  Ceratopera paradoxa (Pereyaslawzewa, 1892) -- valid
  Ceratopera paragracilis Ehlers and Ax, 1974 -- valid
  Ceratopera pilifera Karling, 1986 -- valid
  Ceratopera reisingeri (Riedl, 1959) -- valid
  Ceratopera sellai (Steinböck, 1933) -- valid
  Ceratopera steinboecki (Riedl, 1959) -- valid
  Ceratoplana Bock, 1925 -- valid
  Ceratoplana colobocentroti Bock, 1925 -- valid
  Ceratoplana colobocentroti colobocentroti Bock, 1925 -- valid
  Ceratoplana colobocentroti hawaiensis Bock, 1925 -- invalid
  Ceratoplana colobocentroti hawaiiensis Bock, 1925 -- valid
  Cerbussowia Wilhelmi, 1909 -- valid
  Cerbussowia cerruti Wilhelmi, 1909 -- valid
  Cercyra Schmidt, 1861 -- valid
  Cercyra dioica (Claparède, 1863) -- invalid
  Cercyra hastata Schmidt, 1861 -- valid
  Cercyra macrostoma (Darwin, 1844) -- invalid
  Cercyra papillosa Uljanin, 1870 -- invalid
  Cercyra teissieri Steinmann, 1930 -- valid
  Cercyra verrucosa Du Plessis, 1907 -- invalid
  Cercyridae Böhmig, 1906 -- valid
  Cercyrini Böhmig, 1906 -- valid
  Cercyroidea Böhmig, 1906 -- valid
  Cestoplana Lang, 1884 -- valid
  Cestoplana australis Haswell, 1907 -- invalid
  Cestoplana ceylanica Laidlaw, 1902 -- valid
  Cestoplana cuneata Sopott-Ehlers and Schmidt, 1975 -- invalid
  Cestoplana faraglionensis Lang, 1884 -- valid
  Cestoplana filiformis Laidlaw, 1903 -- invalid
  Cestoplana lactea Kato, 1937 -- invalid
  Cestoplana maldivensis Laidlaw, 1902 -- invalid
  Cestoplana marina Kato, 1938 -- valid
  Cestoplana meridionalis Prudhoe, 1982 -- invalid
  Cestoplana microps (Verrill, 1901) -- invalid
  Cestoplana nexa Sopott-Ehlers and Schmidt, 1975 -- valid
  Cestoplana polypora Meyer, 1922 -- invalid
  Cestoplana raffaelei Ranzi, 1928 -- invalid
  Cestoplana rubripunctata Wilhelmi, 1913 -- invalid
  Cestoplana rubrocincta (Grube, 1840) -- valid
  Cestoplana salar Marcus, 1949 -- valid
  Cestoplana techa Du Bois-Reymond Marcus, 1957 -- valid
  Cestoplanella Faubel, 1983 -- valid
  Cestoplanella microps (Verrill, 1901) -- valid
  Cestoplanidae Lang, 1884 -- valid
  Cestoplanides Faubel, 1983 -- valid
  Cestoplanides lactea (Kato, 1937) -- valid
  Cestoplanoida Faubel, 1983 -- valid
  Cestoplanoida polypora (Meyer, 1922) -- valid
  Cestoplanoidea Lang, 1884 -- invalid
  Chatziplana Faubel, 1983 -- valid
  Chatziplana grubei (Graff, 1892) -- valid
  Cheliplana de Beauchamp, 1927 -- valid
  Cheliplana asica Marcus, 1952 -- valid
  Cheliplana asica asica Marcus, 1952 -- valid
  Cheliplana asica terminalis Brunet, 1968 -- valid
  Cheliplana barringtonensis Noldt and Hoxhold, 1984 -- valid
  Cheliplana boadeni Schilke, 1970 -- valid
  Cheliplana caeca Meixner, 1938 -- invalid
  Cheliplana californica Karling, 1989 -- valid
  Cheliplana curvocirro Schilke, 1970 -- valid
  Cheliplana deverticula Ax, 2008 -- valid
  Cheliplana elkhornica Karling, 1989 -- valid
  Cheliplana euxeinos Ax, 1959 -- valid
  Cheliplana evdonini Karling, 1983 -- valid
  Cheliplana firmata Brunet, 1968 -- valid
  Cheliplana gemmifera Noldt, 1989 -- valid
  Cheliplana glandulosa de Beauchamp, 1927 -- invalid
  Cheliplana hiemalis Brunet, 1968 -- valid
  Cheliplana hypergyna Boaden, 1965 -- valid
  Cheliplana mamkaevi Evdonin, 1977 -- valid
  Cheliplana marcusi (Karling, 1956) -- valid
  Cheliplana microcirrus Noldt, 1989 -- valid
  Cheliplana orthocirra Ax, 1959 -- valid
  Cheliplana pacifica Noldt and Hoxhold, 1984 -- valid
  Cheliplana paradoxa Noldt, 1989 -- valid
  Cheliplana pileola Jouk and DeVocht, 1989 -- valid
  Cheliplana piriformis Brunet, 1968 -- valid
  Cheliplana pusilla Brunet, 1968 -- valid
  Cheliplana remanei (Meixner, 1928) -- valid
  Cheliplana rubescens Brunet, 1966 -- valid
  Cheliplana schilkei Noldt, 1989 -- valid
  Cheliplana setosa Evdonin, 1971 -- valid
  Cheliplana stylifera Karling, 1949 -- valid
  Cheliplana targa (Marcus, 1952) -- valid
  Cheliplana textilis Jouk and DeVocht, 1989 -- valid
  Cheliplana triductibus Van Steenkiste, Volonterio, Schockaert and Artois, 2008 -- valid
  Cheliplana uruguayensis Van Steenkiste, Volonterio, Schockaert and Artois, 2008 -- valid
  Cheliplana vaginalis Karling, 1983 -- valid
  Cheliplana varicauda Brunet, 1971 -- valid
  Cheliplana vestibularis de Beauchamp, 1927 -- valid
  Cheliplanidae Schilke, 1970 -- valid
  Cheliplanilla Meixner, 1938 -- valid
  Cheliplanilla caudata Meixner, 1938 -- valid
  Cheliplanilla implicata Brunet, 1968 -- valid
  Cheliplanilla karlingi Boaden, 1963 -- valid
  Cheliplanilla rubra Schilke, 1970 -- valid
  Childia Graff, 1910 -- valid
  Childia aculifera Nilsson, Wallberg and Jondelius, 2011 -- valid
  Childia baltica Luther, 1912 -- invalid
  Childia brachyposthium (Westblad, 1942) -- valid
  Childia crassum (Westblad, 1942) -- valid
  Childia curinii Nilsson, Wallberg and Jondelius, 2011 -- valid
  Childia cycloposthium (Westblad, 1942) -- valid
  Childia dubium (Westblad, 1942) -- valid
  Childia etium (Marcus, 1954) -- valid
  Childia gracilis (Westblad, 1945) -- valid
  Childia groenlandica (Levinsen, 1879) -- valid
  Childia groenlandica borealis Steinböck, 1932 -- invalid
  Childia haplovata (Dörjes, 1968) -- valid
  Childia leptoposthium (Riedl, 1956) -- valid
  Childia macroposthium (Steinböck, 1931) -- valid
  Childia pansa Marcus, 1950 -- invalid
  Childia spinosa Graff, 1911 -- invalid
  Childia submaculatum (Westblad, 1942) -- valid
  Childia trianguliferum (Westblad, 1942) -- valid
  Childia vivipara Tekle, Raikova and Jondelius, 2006 -- valid
  Childia westbladi (Marcus, 1950) -- valid
  Childianea Faubel and Cameron, 2001 -- valid
  Childianea coomerensis Faubel and Cameron, 2001 -- valid
  Childiidae Dörjes, 1968 -- invalid
  Chiliplana Faubel, 1983 -- valid
  Chiliplana taltalensis Faubel, 1983 -- valid
  Chlamydorhynchus Evdonin, 1977 -- valid
  Chlamydorhynchus evekumiensis Evdonin, 1977 -- valid
  Choeradoplana Graff, 1896 -- valid
  Choeradoplana albonigra (Riester, 1938) -- valid
  Choeradoplana banga Carbayo and E. M. Froehlich, 2012 -- valid
  Choeradoplana benyai Lemos and Leal-Zanchet, 2014 -- valid
  Choeradoplana bilix Marcus, 1951 -- valid
  Choeradoplana bocaina Carbayo and E. M. Froehlich, 2012 -- valid
  Choeradoplana catua C. G. Froehlich, 1955 -- valid
  Choeradoplana crassiphalla Negrete and Brusa, 2012 -- valid
  Choeradoplana ehrenreichi Graff, 1899 -- valid
  Choeradoplana gladismariae Carbayo and E. M. Froehlich, 2012 -- valid
  Choeradoplana iheringi Graff, 1899 -- valid
  Choeradoplana langi (Graff, 1894) -- valid
  Choeradoplana marthae C. G. Froehlich, 1955 -- valid
  Choeradoplana minima Lemos and Leal-Zanchet, 2014 -- valid
  Choeradoplana spatulata Graff, 1899 -- invalid
  Chonostomum Schmarda, 1859 -- invalid
  Chonostomum crenulatum Schmarda, 1859 -- invalid
  Chordariidae Marcus, 1945 -- valid
  Chordarium Marcus, 1945 -- valid
  Chordarium cryptum Marcus, 1945 -- valid
  Chordarium europaeum Schwank, 1980 -- valid
  Chordarium evelinae Marcus, 1945 -- valid
  Chordarium leucanthum Marcus, 1945 -- valid
  Chordarium philum Marcus, 1945 -- valid
  Chorizogynopora Reisinger, 1924 -- valid
  Chorizogynopora italica Kolasa, 1981 -- valid
  Chorizogynopora paradoxa Reisinger, 1924 -- valid
  Chromoplana Bock, 1922 -- valid
  Chromoplana bella Bock, 1922 -- valid
  Chromoplana kaikouris Holleman, 2007 -- valid
  Chromoplana sirena Holleman, 2007 -- valid
  Chromoplanidae Bock, 1922 -- valid
  Chromyella Correa, 1958 -- valid
  Chromyella saga Correa, 1958 -- valid
  Cicerina Giard, 1904 -- valid
  Cicerina bicirrata Karling, 1989 -- valid
  Cicerina brevicirrus Meixner, 1928 -- valid
  Cicerina debrae Tucker, Stevens and Smith, 2014 -- valid
  Cicerina dubia Noldt, 1986 -- invalid
  Cicerina elegans (Evdonin, 1971) -- valid
  Cicerina eucentrota Ax, 1959 -- valid
  Cicerina remanei Meixner, 1928 -- valid
  Cicerina tetradactyla Giard, 1904 -- valid
  Cicerina triangularis Karling, 1989 -- valid
  Cicerinidae Meixner, 1928 -- valid
  Cicerininae Meixner, 1928 -- valid
  Cilionema Karling, Mack-Fira and Dörjes, 1972 -- valid
  Cilionema hawaiiensis Karling, Mack-Fira and Dörjes, 1972 -- valid
  Ciliopharyngiella Ax, 1952 -- valid
  Ciliopharyngiella constricta Martens and Schockaert, 1981 -- valid
  Ciliopharyngiella intermedia Ax, 1952 -- valid
  Ciliopharyngiellidae Ax, 1952 -- valid
  Cincturorhynchus Evdonin, 1970 -- valid
  Cincturorhynchus karlingi Schockaert, 1982 -- valid
  Cincturorhynchus monaculeus Willems, Schockaert and Artois, 2006 -- valid
  Cincturorhynchus ruber Evdonin, 1970 -- valid
  Cirrifera Sopott, 1972 -- valid
  Cirrifera aculeata (Ax, 1951) -- valid
  Cirrifera boletiformae Sopott, 1972 -- valid
  Cirrifera cirrifera Sopott, 1972 -- valid
  Cirrifera dumosa Sopott, 1972 -- valid
  Cirrifera genitoductus Jouk, Martens and Schockaert, 2007 -- valid
  Cirrifera sopottehlersae Noldt and Jouk, 1988 -- valid
  Cirrifera xanthoderma Riser, 1981 -- valid
  Cirroplana Miller and Faubel, 2003 -- valid
  Cirroplana mansi Miller and Faubel, 2003 -- valid
  Cirroplaninae Miller and Faubel, 2003 -- valid
  Cirroposthia Steinböck, 1937 -- invalid
  Cirroposthia steueri Steinböck, 1937 -- invalid
  Cleistogamia Faust, 1924 -- valid
  Cleistogamia heronensis Cannon, 1982 -- valid
  Cleistogamia holothuriana Faust, 1924 -- valid
  Cleistogamia longicirrus Cannon, 1982 -- valid
  Cleistogamia loutfia (Khalil and Azim, 1937) -- valid
  Cleistogamia pallii Cannon, 1982 -- valid
  Cleistogamia pulchra Cannon, 1982 -- valid
  Cleistogamia pyriformis Cannon, 1982 -- valid
  Clyporhynchus Karling, 1947 -- valid
  Clyporhynchus monolentis Karling, 1947 -- valid
  Coagulescorhynchus Noldt and Hoxhold, 1984 -- valid
  Coagulescorhynchus virguladivina Noldt and Hoxhold, 1984 -- valid
  Coelogynopora Steinböck, 1924 -- valid
  Coelogynopora aculeata Ax, 1951 -- invalid
  Coelogynopora alata Tajika, 1981 -- valid
  Coelogynopora axi Sopott, 1972 -- valid
  Coelogynopora biarmata Steinböck, 1924 -- valid
  Coelogynopora birostrata Tajika, 1978 -- valid
  Coelogynopora brachystyla Karling, 1967 -- valid
  Coelogynopora bresslaui Steinböck, 1924 -- invalid
  Coelogynopora cassida Sopott-Ehlers, 1985 -- valid
  Coelogynopora cochleare Ax and Sopott-Ehlers, 1979 -- valid
  Coelogynopora coniuncta Tajika, 1978 -- valid
  Coelogynopora coronata Ax, 2008 -- valid
  Coelogynopora distortofolio Sopott, 1972 -- valid
  Coelogynopora erotica Riser, 1981 -- valid
  Coelogynopora faenofurca Sopott-Ehlers, 1992 -- valid
  Coelogynopora faeroernensis Ax, 2008 -- valid
  Coelogynopora falcaria Ax and Sopott-Ehlers, 1979 -- valid
  Coelogynopora fontinalis Steinböck and Reisinger, 1931 -- invalid
  Coelogynopora forcipis Sopott-Ehlers, 1976 -- valid
  Coelogynopora frondifera Ax and Sopott-Ehlers, 1979 -- valid
  Coelogynopora gallica Sopott-Ehlers, 1976 -- valid
  Coelogynopora gigantea Meixner, 1938 -- valid
  Coelogynopora gynocotyla Steinböck, 1924 -- valid
  Coelogynopora hamulis Sopott-Ehlers, 1980 -- valid
  Coelogynopora hangoensis Karling, 1953 -- valid
  Coelogynopora hymanae Riser, 1981 -- valid
  Coelogynopora juxtaforcipis Riser, 1981 -- valid
  Coelogynopora nodosa Ax and Sopott-Ehlers, 1979 -- valid
  Coelogynopora paracnida Karling, 1967 -- invalid
  Coelogynopora poaceaglandis Riser, 1981 -- valid
  Coelogynopora scalpri Ax and Sopott-Ehlers, 1979 -- valid
  Coelogynopora schulzii Meixner, 1938 -- valid
  Coelogynopora sequana Sopott-Ehlers, 1992 -- valid
  Coelogynopora sewardensis Ax and Armonies, 1990 -- valid
  Coelogynopora solifer Sopott, 1972 -- valid
  Coelogynopora steinboecki Sopott-Ehlers, 1980 -- valid
  Coelogynopora tenuiformis Karling, 1967 -- valid
  Coelogynopora tenuis Meixner, 1938 -- valid
  Coelogynopora visurgis Sopott-Ehlers, 1989 -- valid
  Coelogynoporidae Bresslau, 1933 -- valid
  Coelogynoporinae Bresslau, 1933 -- invalid
  Coenoplana Moseley, 1877 -- invalid
  Coenoplana coxii (Fletcher and Hamilton, 1888) -- invalid
  Cohenella Timoshkin, 2004 -- valid
  Cohenella microstylus (Timoshkin, 1986) -- valid
  Cohenella pronini Timoshkin, 2004 -- valid
  Cohenella rudenkoi Timoshkin, 2011 -- valid
  Cohenella semernoyi Timoshkin, 2004 -- valid
  Cohenella sidelevae Timoshkin, 2004 -- valid
  Coleocephalus Fyfe, 1953 -- valid
  Coleocephalus fuscus Fyfe, 1953 -- valid
  Coleophora Steinböck, 1932 -- invalid
  Coleophora alba (Levinsen, 1879) -- invalid
  Coleophora chionoecetis (Steinböck, 1932) -- invalid
  Coleophora hirudo (Levinsen, 1879) -- invalid
  Coleophora levinseni (Steinböck, 1932) -- invalid
  Collastoma Dörler, 1900 -- valid
  Collastoma eremitae Beklemischev, 1916 -- valid
  Collastoma kozloffi Westervelt, 1981 -- valid
  Collastoma minutum Wahl, 1906 -- valid
  Collastoma monorchis Dörler, 1900 -- valid
  Collastoma pacificum Kozloff, 1953 -- valid
  Collastoma wahli Ponce de Leon and Mane-Garzon, 1980 -- valid
  Collastominae Wahl, 1910 -- valid
  Combinata Karling, 1940 -- invalid
  Comoplana Faubel, 1983 -- valid
  Comoplana agilis (Lang, 1884) -- valid
  Comoplana angusta (Verrill, 1893) -- valid
  Comoplana palmula (Quatrefage, 1845) -- valid
  Comoplana pusilla (Bock, 1924) -- valid
  Comprostatum Hyman, 1944 -- invalid
  Comprostatum insularis Hyman, 1944 -- invalid
  Comprostatum veneris Hyman, 1944 -- invalid
  Conaperta Antonius, 1968 -- valid
  Conaperta actuosa (Kozloff, 1965) -- invalid
  Conaperta antonii Achatz, Hooge and Tyler, 2007 -- valid
  Conaperta cirrata Achatz, Hooge and Tyler, 2007 -- valid
  Conaperta colorata Ehlers and Dörjes, 1979 -- invalid
  Conaperta divae (Marcus, 1950) -- invalid
  Conaperta earnhardti Hooge and Smith, 2004 -- invalid
  Conaperta flavibacillum (Jensen, 1878) -- valid
  Conaperta hortula Hooge and Tyler, 2003 -- invalid
  Conaperta hortulus Hooge and Tyler, 2003 -- invalid
  Conaperta krana Antonius, 1968 -- invalid
  Conaperta lineata (Peebles, 1915) -- valid
  Conaperta norvegica (Westblad, 1946) -- invalid
  Conaperta thela Antonius, 1968 -- invalid
  Conaperta urua (Marcus, 1954) -- invalid
  Conaperta variomorpha (Dörjes, 1968) -- invalid
  Conaperta vexillaria (Marcus, 1948) -- invalid
  Conaperta westbladi (Marcus, 1949) -- invalid
  Conjuguterus Pearse, 1938 -- invalid
  Conjuguterus parvus Pearse, 1938 -- invalid
  Conoceros Lang, 1884 -- invalid
  Conoceros conoceraeus (Schmarda, 1859) -- invalid
  Continenticola Carranza, Littlewood, Clough, Ruiz-Trillo, Baguna and Riutort, 1998 -- invalid
  Convoluella Faubel, 1974 -- valid
  Convoluella brunea Faubel, 1974 -- valid
  Convoluta Ĝrsted, 1843 -- valid
  Convoluta actuosa (Kozloff, 1965) -- invalid
  Convoluta adaica Beklemischev, 1964 -- invalid
  Convoluta aegyptica Antonius, 1968 -- invalid
  Convoluta agilis An der Lan, 1936 -- invalid
  Convoluta albicincta Schultze, 1849 -- invalid
  Convoluta albomaculata (Pereyaslawzewa, 1892) -- invalid
  Convoluta anotica Schmarda, 1859 -- invalid
  Convoluta armata Graff, 1874 -- invalid
  Convoluta bathycola Steinböck and Lanser, 1932 -- invalid
  Convoluta bifoveolata Mamkaev, 1971 -- invalid
  Convoluta bimaculata Graff, 1882 -- valid
  Convoluta boehmigi (Brauner, 1920) -- valid
  Convoluta borealis Sabussow, 1900 -- valid
  Convoluta boyeri Bush, 1984 -- valid
  Convoluta cenata Du Bois-Reymond Marcus, 1955 -- invalid
  Convoluta chiridotae (Beklemischev, 1915) -- valid
  Convoluta chuni (Brauner, 1920) -- invalid
  Convoluta cinereus Graff, 1874 -- invalid
  Convoluta confusa Graff, 1904 -- valid
  Convoluta convoluta (Abildgaard, 1806) -- valid
  Convoluta diesingii Schmidt, 1852 -- invalid
  Convoluta diploposthia Steinböck, 1931 -- invalid
  Convoluta divae Marcus, 1950 -- invalid
  Convoluta dubia Brauner, 1926 -- invalid
  Convoluta elegans Pereyaslawzewa, 1892 -- invalid
  Convoluta enelitta Antonius, 1968 -- valid
  Convoluta festiva Uljanin, 1870 -- invalid
  Convoluta flavibacillum Jensen, 1878 -- invalid
  Convoluta fulvomaculata Ax, 1959 -- invalid
  Convoluta furugelmi Mamkaev, 1971 -- valid
  Convoluta gracilis Yamasu, 1982 -- invalid
  Convoluta groenlandica Levinsen, 1879 -- invalid
  Convoluta hamata An der Lan, 1936 -- invalid
  Convoluta haustrum Dalyell, 1853 -- invalid
  Convoluta helgolandica Dörjes, 1968 -- invalid
  Convoluta henseni Böhmig, 1895 -- valid
  Convoluta hipparchia Pereyaslawzewa, 1892 -- valid
  Convoluta hipparchia hipparchia Pereyaslawzewa, 1892 -- valid
  Convoluta hipparchia nigra Pereyaslawzewa, 1892 -- valid
  Convoluta hipparchia violacea Pereyaslawzewa, 1892 -- valid
  Convoluta infundibulum Schmidt, 1861 -- invalid
  Convoluta japonica Kato, 1951 -- invalid
  Convoluta johnstoni (Diesing, 1862) -- invalid
  Convoluta karlingi Westblad, 1946 -- invalid
  Convoluta karpredi Hooge and Tyler, 2003 -- invalid
  Convoluta kikaiensis Yamasu, 1982 -- valid
  Convoluta krana (Antonius, 1968) -- valid
  Convoluta lacazii Graff, 1891 -- invalid
  Convoluta lacrimosa Achatz, Hooge and Tyler, 2007 -- valid
  Convoluta langerhansi Graff, 1882 -- invalid
  Convoluta lineata (Peebles, 1915) -- invalid
  Convoluta lutheri Westblad, 1940 -- invalid
  Convoluta macnaei Du Bois-Reymond Marcus, 1957 -- invalid
  Convoluta macroposthia Steinböck, 1931 -- invalid
  Convoluta marginalis Ivanov, 1952 -- invalid
  Convoluta marisalba (Sabussow, 1899) -- valid
  Convoluta minima Westblad, 1948 -- invalid
  Convoluta minuta Claparède, 1863 -- invalid
  Convoluta naikaiensis Yamasu, 1982 -- invalid
  Convoluta naviculae Yamasu, 1982 -- valid
  Convoluta niphoni Achatz, 2008 -- valid
  Convoluta nitidae Yamasu, 1982 -- invalid
  Convoluta norvegica Westblad, 1946 -- invalid
  Convoluta opisthandropora Mamkaev, 1971 -- invalid
  Convoluta paradoxa Ĝrsted, 1843 -- invalid
  Convoluta pelagica Lohner and Micoletzky, 1911 -- valid
  Convoluta philippinensis Bush, 1984 -- valid
  Convoluta psammophilum Beklemischev, 1957 -- invalid
  Convoluta pulchra Smith and Bush, 1991 -- invalid
  Convoluta punctata Riedl, 1959 -- valid
  Convoluta pusilla Westblad, 1946 -- invalid
  Convoluta pygopora Antonius, 1968 -- valid
  Convoluta rhammifera Westblad, 1946 -- invalid
  Convoluta roscoffensis Graff, 1891 -- invalid
  Convoluta sagittifera Ivanov, 1952 -- invalid
  Convoluta saliens (Graff, 1882) -- invalid
  Convoluta saliens solowetzkiana Sabussow, 1897 -- invalid
  Convoluta schmidti Czerniavsky, 1881 -- valid
  Convoluta schuelii Achatz, 2008 -- valid
  Convoluta schultzii Schmidt, 1852 -- invalid
  Convoluta semperi Graff, 1882 -- valid
  Convoluta sordida Graff, 1882 -- valid
  Convoluta stylifera Westblad, 1946 -- invalid
  Convoluta subsalina Ax, 1959 -- invalid
  Convoluta subtilis (Graff, 1882) -- invalid
  Convoluta sutcliffei Hanson, 1961 -- invalid
  Convoluta thauma Marcus, 1952 -- invalid
  Convoluta thela (Antonius, 1968) -- valid
  Convoluta uljanini Graff, 1904 -- valid
  Convoluta urua Marcus, 1954 -- invalid
  Convoluta variabilis (Pereyaslawzewa, 1892) -- valid
  Convoluta variomorpha Dörjes, 1968 -- invalid
  Convoluta vexillaria Marcus, 1948 -- invalid
  Convoluta virescens Wilhelmi, 1913 -- invalid
  Convoluta viridipunctata Westblad, 1946 -- invalid
  Convoluta viridis Pereyaslawzewa, 1892 -- invalid
  Convoluta westbladi Marcus, 1949 -- invalid
  Convolutidae Graff, 1905 -- valid
  Convolutriloba Hendelberg and Akesson, 1988 -- valid
  Convolutriloba hastifera Winsor, 1990 -- valid
  Convolutriloba japonica (Kato, 1951) -- invalid
  Convolutriloba longifissura Bartolomaeus and Balzer, 1997 -- valid
  Convolutriloba macropyga Shannon and Achatz, 2007 -- valid
  Convolutriloba retrogemma Hendelberg and Akesson, 1988 -- valid
  Convolutrilobinae Geschwentner, Ladurner, Salvenmoser, Rieger and Tyler, 1999 -- invalid
  Copidoplana Bock, 1913 -- valid
  Copidoplana paradoxa Bock, 1913 -- valid
  Copidoplana tripyla Hyman, 1953 -- invalid
  Copidoplana virgae Sopott-Ehlers and Schmidt, 1975 -- invalid
  Coronadena Hyman, 1940 -- valid
  Coronadena mutabilis (Verrill, 1873) -- valid
  Coronhelmis Luther, 1948 -- valid
  Coronhelmis conspicuus Ax, 1994 -- valid
  Coronhelmis cuypersi Willems, Artois, Backeljau and Schockaert, 2005 -- valid
  Coronhelmis exiguus Ax, 1994 -- valid
  Coronhelmis inornatus Ehlers, 1974 -- valid
  Coronhelmis lutheri Ax, 1951 -- valid
  Coronhelmis mimosa Van Steenkiste, Volonterio, Schockaert and Artois, 2008 -- valid
  Coronhelmis multispinosus Luther, 1948 -- valid
  Coronhelmis noerrevangi Ax, 1994 -- valid
  Coronhelmis novaecaledoniae Willems, Artois, Backeljau and Schockaert, 2005 -- valid
  Coronhelmis parvamanica Ehlers, 1974 -- invalid
  Coronhelmis subtilis Ax, 2008 -- valid
  Coronhelmis tripartitus Ehlers, 1974 -- valid
  Coronhelmis urna Ax, 1954 -- valid
  Coronopharynx Luther, 1962 -- valid
  Coronopharynx pusillus Luther, 1962 -- valid
  Cotylea Lang, 1884 -- valid
  Cotylocera Zahony, 1907 -- invalid
  Cotylocera michaelseni Zahony, 1907 -- invalid
  Cotyloplana Spencer, 1892 -- valid
  Cotyloplana borneensis de Beauchamp, 1933 -- valid
  Cotyloplana diesingi Graff, 1899 -- invalid
  Cotyloplana dugesi Graff, 1899 -- invalid
  Cotyloplana megalophthalma (Loman, 1890) -- invalid
  Cotyloplana nilgiriensis Whitehouse, 1919 -- invalid
  Cotyloplana pilleata Whitehouse, 1915 -- invalid
  Cotyloplana punctata Spencer, 1892 -- valid
  Cotyloplana sharpi Graff, 1899 -- invalid
  Cotyloplana whiteleggei Spencer, 1892 -- invalid
  Coulterella Timoshkin, 2004 -- valid
  Coulterella bondarenkoi Timoshkin, 2004 -- valid
  Coulterella hirotaorum Timoshkin, 2004 -- valid
  Coulterella kalinini Timoshkin, 2004 -- valid
  Coulterella kawakatsui Timoshkin, 2004 -- valid
  Coulterella melnikae Timoshkin, 2004 -- valid
  Coulterella ohtakai Timoshkin, 2004 -- valid
  Coulterella osipovae Timoshkin, 2004 -- valid
  Coulterella vainolai Timoshkin, 2004 -- valid
  Craniocephala Monticelli, 1905 -- valid
  Craniocephala biroi Monticelli, 1905 -- valid
  Craspedella Haswell, 1893 -- valid
  Craspedella bribiensis Sewell and Cannon, 1998 -- valid
  Craspedella cooranensis Sewell and Cannon, 1998 -- valid
  Craspedella gracilis Cannon and Sewell, 1995 -- valid
  Craspedella joffei Sewell and Cannon, 1998 -- valid
  Craspedella pedum Cannon and Sewell, 1995 -- valid
  Craspedella shorti Cannon and Sewell, 1995 -- valid
  Craspedella simulator Cannon and Sewell, 1995 -- valid
  Craspedella spenceri Haswell, 1893 -- valid
  Craspedella yabba Cannon and Sewell, 1995 -- valid
  Craspedellinae Baer, 1931 -- valid
  Craspedommatidea Bock, 1913 -- invalid
  Crassandros Hyman, 1955 -- valid
  Crassandros dominicanus Hyman, 1955 -- valid
  Crassicollidae Dean, 1977 -- valid
  Crassicollum Dean, 1977 -- valid
  Crassicollum musculare Dean, 1977 -- valid
  Crassiplana Hyman, 1955 -- valid
  Crassiplana albatrossi Hyman, 1955 -- valid
  Cratera Carbayo, Alvarez-Presas, Olivares, Marques, E. M. Froehlich and Riutort, 2013 -- valid
  Cratera anamariae Carbayo, 2015 -- valid
  Cratera aureomaculata Rossi and Leal-Zanchet, 2017 -- valid
  Cratera crioula (E. M. Froehlich, 1955) -- valid
  Cratera cryptolineata Rossi and Leal-Zanchet, 2017 -- valid
  Cratera cuarassu Carbayo and Almeida, 2015 -- valid
  Cratera joia (C. G. Froehlich, 1956) -- valid
  Cratera nigrimarginata Rossi and Leal-Zanchet, 2017 -- valid
  Cratera ochra Rossi, Amaral, Ribeiro, Cauduro, Fick, Valiati and Leal-Zanchet, 2015 -- valid
  Cratera pseudovaginuloides (Riester, 1938) -- valid
  Cratera steffeni Rossi, Fontoura, Amaral and Leal-Zanchet, 2014 -- valid
  Cratera tamoia (E. M. Froehlich, 1955) -- valid
  Cratera viridimaculata Negrete and Brusa, 2016 -- valid
  Cratera yara (E. M. Froehlich, 1955) -- valid
  Crenobia Kenk, 1930 -- valid
  Crenobia abscissa (Ijima, 1887) -- valid
  Crenobia alpina (Dana, 1766) -- valid
  Crenobia alpina alba (Oye, 1935) -- valid
  Crenobia alpina alpina (Dana, 1766) -- valid
  Crenobia alpina anophthalma (Mrazek, 1907) -- valid
  Crenobia alpina bathycola (Steinmann, 1911) -- valid
  Crenobia alpina corsica (Arndt, 1920) -- valid
  Crenobia alpina meridionalis (Thienemann, 1938) -- invalid
  Crenobia alpina montenigrina (Mrazek, 1904) -- valid
  Crenobia alpina septentrionalis (Thienemann, 1938) -- valid
  Crenobia alpina teratophila (Steinmann, 1908) -- valid
  Crenobia anophthalma (Mrazek, 1907) -- invalid
  Crenobia infernalis (Steinmann, 1907) -- invalid
  Crenobia montenegrina (Mrazek, 1904) -- invalid
  Crenobia teratophila (Steinmann, 1908) -- invalid
  Cryptobiceros Faubel, 1984 -- valid
  Cryptobiceros bajae (Hyman, 1953) -- valid
  Cryptocelidae Laidlaw, 1903 -- valid
  Cryptocelides Bergendal, 1890 -- valid
  Cryptocelides loveni Bergendal, 1890 -- valid
  Cryptocelides samoensis Palombi, 1923 -- valid
  Cryptocelididae Laidlaw, 1903 -- invalid
  Cryptocelidinae Laidlaw, 1903 -- invalid
  Cryptocelis Lang, 1884 -- valid
  Cryptocelis alba Lang, 1884 -- valid
  Cryptocelis amakusaensis Kato, 1936 -- valid
  Cryptocelis arenicola Hallez, 1893 -- invalid
  Cryptocelis compacta Lang, 1884 -- valid
  Cryptocelis equiteni Hallez, 1888 -- valid
  Cryptocelis glandulata Jacubowa, 1909 -- valid
  Cryptocelis ijimae Bock, 1923 -- valid
  Cryptocelis ijimai Bock, 1923 -- invalid
  Cryptocelis insularis Hyman, 1953 -- valid
  Cryptocelis lactea Lang, 1884 -- invalid
  Cryptocelis lilianae Marcus and Marcus, 1968 -- valid
  Cryptocelis littoralis Kato, 1937 -- valid
  Cryptocelis occidentalis Hyman, 1953 -- valid
  Cryptocelis orientalis Kato, 1939 -- valid
  Cryptoceros Faubel, 1984 -- valid
  Cryptoceros aureolineatus (Verrill, 1901) -- invalid
  Cryptoceros crozieri (Hyman, 1939) -- invalid
  Cryptoceros marmoratus (Plehn, 1898) -- valid
  Cryptoceros sasakii (Kaburaki, 1923) -- valid
  Cryptocoelum Stimpson, 1857 -- invalid
  Cryptocoelum opacum Stimpson, 1857 -- invalid
  Cryptophallinae Bresslau, 1933 -- invalid
  Cryptophallus Bock, 1913 -- valid
  Cryptophallus aegypticus Melouk, 1940 -- invalid
  Cryptophallus bartschi Kaburaki, 1923 -- invalid
  Cryptophallus eximius Kato, 1937 -- invalid
  Cryptophallus japonicus Kato, 1944 -- invalid
  Cryptophallus magnus Freeman, 1933 -- invalid
  Cryptophallus sondaicus Bock, 1925 -- valid
  Cryptophallus wahlbergi Bock, 1913 -- valid
  Cryptostiopera Ax, 1974 -- valid
  Cryptostiopera cornuta Ax, 1974 -- valid
  Cryptostylochus Faubel, 1983 -- valid
  Cryptostylochus coseirensis (Bock, 1925) -- valid
  Cryptostylochus hullensis Faubel and Gollasch, 1996 -- valid
  Cryptostylochus koreensis Bulnes, Faubel and Park, 2005 -- valid
  Crytostylochus Faubel, 1983 -- invalid
  Crytostylochus koreensis Bulnes, Faubel and Park, 2005 -- invalid
  Culleopharynx Ehlers, 1972 -- valid
  Culleopharynx armatus (Riedl, 1956) -- valid
  Cura Strand, 1942 -- valid
  Cura azteca Benazzi and Giannini, 1971 -- invalid
  Cura evelinae Marcus, 1955 -- invalid
  Cura falklandica (Westblad, 1952) -- invalid
  Cura foremanii (Girard, 1852) -- valid
  Cura fortis Sluys and Kawakatsu, 2001 -- valid
  Cura graffi (Weiss, 1909) -- invalid
  Cura jeanneli (de Beauchamp, 1913) -- invalid
  Cura michaelseni (Böhmig, 1902) -- invalid
  Cura paeta Marcus, 1955 -- invalid
  Cura patagonica (Borelli, 1901) -- invalid
  Cura pinguis (Weiss, 1910) -- valid
  Cura schubarti (Marcus, 1946) -- invalid
  Cura tinga Marcus, 1955 -- invalid
  Cura wimbimba Marcus, 1970 -- invalid
  Curtisia Graff, 1916 -- invalid
  Curtisia ambigua (Böhmig, 1902) -- invalid
  Curtisia falklandica Westblad, 1952 -- invalid
  Curtisia foremanii (Girard, 1852) -- invalid
  Curtisia michaelsoni (Böhmig, 1902) -- invalid
  Curtisia patagonica (Borelli, 1901) -- invalid
  Curtisia schubarti Marcus, 1946 -- invalid
  Curtisia seclusa (de Beauchamp, 1940) -- invalid
  Curtisia simplicissima (Morgan, 1904) -- invalid
  Curtisia simplissima (Curtis, 1900) -- invalid
  Curtisia stagnalis Nurse, 1950 -- invalid
  Cycloporus Lang, 1884 -- valid
  Cycloporus albofasciatus Newman and Cannon, 2002 -- valid
  Cycloporus atratus Newman and Cannon, 2002 -- valid
  Cycloporus australis Prudhoe, 1982 -- valid
  Cycloporus gabriellae Marcus, 1950 -- valid
  Cycloporus guttatus Newman and Cannon, 2002 -- valid
  Cycloporus harlequin Newman and Cannon, 2002 -- valid
  Cycloporus japonicus Kato, 1944 -- valid
  Cycloporus maculatus Hallez, 1893 -- valid
  Cycloporus papillosus (Sars, 1878) -- valid
  Cycloporus papillosus levigatus Lang, 1884 -- valid
  Cycloporus papillosus papillosus (Sars, 1878) -- valid
  Cycloporus reticulatus Newman and Cannon, 2002 -- valid
  Cycloporus spiritus Newman and Cannon, 2002 -- valid
  Cycloporus tuberculatus (Schmidtlein, 1880) -- invalid
  Cycloporus variegatus Kato, 1934 -- valid
  Cycloporus venetus Newman and Cannon, 2002 -- valid
  Cycloporus xanthopunctatus Newman and Cannon, 2002 -- valid
  Cylindromacrostomum Rieger, 1971 -- valid
  Cylindromacrostomum formosae Schockaert, 2014 -- valid
  Cylindromacrostomum mediterraneum (Ax, 1955) -- valid
  Cylindromacrostomum notandum (Ax, 1951) -- valid
  Cylindromacrostomum riegeri Schockaert, 2014 -- valid
  Cylindrostoma Ĝrsted, 1845 -- valid
  Cylindrostoma album Levinsen, 1879 -- invalid
  Cylindrostoma atlanticum Beltagi, 2005 -- valid
  Cylindrostoma bitubatum Westblad, 1952 -- valid
  Cylindrostoma caudatum (Schmarda, 1859) -- invalid
  Cylindrostoma cyprinae (Graff, 1882) -- invalid
  Cylindrostoma discors Levinsen, 1879 -- invalid
  Cylindrostoma dubium Ĝrsted, 1845 -- valid
  Cylindrostoma elegans Pereyaslawzewa, 1892 -- invalid
  Cylindrostoma elongatum Gamble, 1879 -- invalid
  Cylindrostoma fingalianum (Claparède, 1861) -- valid
  Cylindrostoma gaussi Reisinger, 1926 -- valid
  Cylindrostoma gracilis Westblad, 1955 -- valid
  Cylindrostoma hyljeum Marcus, 1952 -- valid
  Cylindrostoma ibeenum Marcus, 1950 -- valid
  Cylindrostoma inerme (Hallez, 1879) -- invalid
  Cylindrostoma klostermanni (Graff, 1874) -- invalid
  Cylindrostoma klostermanni Pereyaslawzewa, 1892 -- invalid
  Cylindrostoma laetum Riedl, 1959 -- invalid
  Cylindrostoma longifilum Jensen, 1878 -- invalid
  Cylindrostoma luridum Riedl, 1954 -- valid
  Cylindrostoma lutheri Westblad, 1955 -- valid
  Cylindrostoma micropharynx Westblad, 1952 -- valid
  Cylindrostoma monotrochum (Graff, 1882) -- valid
  Cylindrostoma myfflum Marcus, 1951 -- invalid
  Cylindrostoma netsicum Marcus, 1950 -- valid
  Cylindrostoma oerstedi Levinsen, 1879 -- invalid
  Cylindrostoma paralutheri Karling, 1993 -- valid
  Cylindrostoma pleiocelis Graff, 1882 -- valid
  Cylindrostoma ponticum (Uljanin, 1870) -- invalid
  Cylindrostoma quadrioculatum (Leuckart, 1847) -- invalid
  Cylindrostoma triangulum Karling, 1962 -- valid
  Cylindrostoma tubiferum Westblad, 1955 -- invalid
  Cylindrostoma vanhoffeni Reisinger, 1926 -- valid
  Cylindrostoma zooxanthella (Graff, 1886) -- valid
  Cylindrostomidae Reisinger, 1924 -- valid
  Cyrtomorpha Graff, 1882 -- invalid
  Cyrtomorpha cinerea (Graff, 1874) -- invalid
  Cyrtomorpha saliens Graff, 1882 -- invalid
  Cyrtomorpha subtilis Graff, 1882 -- invalid
  Cystiplana Karling, 1964 -- valid
  Cystiplana karlingi Hoxhold, 1971 -- invalid
  Cystiplana paradoxa Karling, 1964 -- valid
  Cystiplana rubra Dean, 1977 -- valid
  Cystiplanidae Karling, 1964 -- valid
  Cystiplex Karling, 1956 -- valid
  Cystiplex axi Karling, 1964 -- valid
  Cystirete Brunet, 1965 -- valid
  Cystirete graefei Brunet, 1965 -- valid
  Cytocystididae Karling, 1964 -- valid
  Cytocystis Karling, 1953 -- valid
  Cytocystis clitellatus Karling, 1953 -- valid
  Dactylocephala Monticelli, 1899 -- valid
  Dactylocephala madagascariensis (Vayssiere, 1892) -- valid
  Daelja Marcus, 1951 -- valid
  Daelja secuta Marcus, 1951 -- valid
  Daku Hooge, 2003 -- valid
  Daku riegeri Hooge and Tyler, 2008 -- valid
  Daku woorimensis Hooge, 2003 -- valid
  Dakuidae Hooge, 2003 -- valid
  Dalyellia Fleming, 1822 -- valid
  Dalyellia Gieysztor, 1938 -- invalid
  Dalyellia (Scoparia) Gieysztor, 1934 -- invalid
  Dalyellia (Scopariella) Ruebush and Hayes, 1939 -- invalid
  Dalyellia abursalis Ruebush, 1937 -- invalid
  Dalyellia alba Higley, 1918 -- valid
  Dalyellia arctica Nasonov, 1923 -- invalid
  Dalyellia armigera (Schmidt, 1861) -- invalid
  Dalyellia armigera microphthalma (Vejdovsky, 1895) -- invalid
  Dalyellia armygera (Schmidt, 1861) -- invalid
  Dalyellia articulata Graff, 1911 -- invalid
  Dalyellia aspinosa Ruebush, 1937 -- invalid
  Dalyellia aspinosa Szynal, 1932 -- invalid
  Dalyellia bardeaui Steinböck, 1926 -- invalid
  Dalyellia beltrani Gieysztor, 1931 -- invalid
  Dalyellia benacensis Steinböck, 1932 -- invalid
  Dalyellia bergi Beklemischev, 1927 -- invalid
  Dalyellia bicornis Nasonov, 1926 -- invalid
  Dalyellia bicoronaria Fulinski, 1933 -- invalid
  Dalyellia bilineata (Woodworth, 1896) -- invalid
  Dalyellia biwae Okugawa, 1930 -- invalid
  Dalyellia blodgetti (Silliman, 1884) -- invalid
  Dalyellia brevimana Beklemischev, 1921 -- invalid
  Dalyellia brevimana picta Fulinski and Szynal, 1933 -- invalid
  Dalyellia brevimana tectispinosa Weise, 1942 -- invalid
  Dalyellia brevispina Hofsten, 1907 -- invalid
  Dalyellia brevispina marituica Nasonov, 1926 -- invalid
  Dalyellia brevispina tubulifera Nasonov, 1919 -- invalid
  Dalyellia brevistyla Eggers, 1925 -- invalid
  Dalyellia callvucurai Damborenea, Brusa and Noreña, 2007 -- valid
  Dalyellia capreola Steinböck, 1948 -- invalid
  Dalyellia caucasica Plotnikow, 1906 -- valid
  Dalyellia caucasica caucasica Plotnikow, 1906 -- valid
  Dalyellia caucasica rubra Nasonov, 1919 -- valid
  Dalyellia cetica Reisinger, 1924 -- valid
  Dalyellia chlynovica Nasonov, 1919 -- invalid
  Dalyellia chlynovica occidentalis Nasonov, 1920 -- invalid
  Dalyellia circulobursalis Ruebush, 1937 -- invalid
  Dalyellia complicata (Fuhrmann, 1914) -- invalid
  Dalyellia coronaria (Schmidt, 1858) -- invalid
  Dalyellia cuspidata (Schmidt, 1861) -- invalid
  Dalyellia cuspidata quinquedentatus (Wassilieff, 1891) -- invalid
  Dalyellia cuspidata sexdentatus (Sekera, 1906) -- invalid
  Dalyellia cuspidata triclinica Nasonov, 1919 -- invalid
  Dalyellia deses Riedel, 1932 -- invalid
  Dalyellia diadema Hofsten, 1907 -- invalid
  Dalyellia dissimilis Szynal, 1932 -- invalid
  Dalyellia dodgei Graff, 1911 -- invalid
  Dalyellia dubitativa Sibiriakova, 1929 -- invalid
  Dalyellia eastmani Graff, 1911 -- invalid
  Dalyellia elongatum (Schmarda, 1859) -- invalid
  Dalyellia erivanica (Plotnikow, 1906) -- valid
  Dalyellia erythrocephala Steinböck, 1949 -- invalid
  Dalyellia euchroa Gieysztor, 1926 -- invalid
  Dalyellia expedita Hofsten, 1907 -- invalid
  Dalyellia expedita expeditoides (Luther, 1955) -- invalid
  Dalyellia fairchildi Graff, 1911 -- invalid
  Dalyellia fairchildi oligochaeta Nasonov, 1920 -- invalid
  Dalyellia fairchildi polychaeta Nasonov, 1919 -- invalid
  Dalyellia fairchildi synchaeta Nasonov, 1921 -- invalid
  Dalyellia fibrosa Szynal, 1932 -- invalid
  Dalyellia foreli Hofsten, 1911 -- invalid
  Dalyellia fulcrifera Weise, 1942 -- invalid
  Dalyellia fulinskii Szynal, 1932 -- invalid
  Dalyellia fusca (Fuhrmann, 1894) -- invalid
  Dalyellia gilesi Jones and Hayes, 1941 -- invalid
  Dalyellia gracilis Fulinski and Szynal, 1927 -- valid
  Dalyellia gracilis Okugawa, 1930 -- invalid
  Dalyellia graffi (Hallez, 1878) -- invalid
  Dalyellia groenlandica Riedel, 1932 -- invalid
  Dalyellia hallezi Beklemischev, 1917 -- invalid
  Dalyellia hallezi (Graff, 1882) -- invalid
  Dalyellia hallezi borealis Eggers, 1925 -- invalid
  Dalyellia helluo (O. F. Müller, 1773) -- invalid
  Dalyellia horrida (Schmidt, 1861) -- invalid
  Dalyellia idahoensis Knapp, 1954 -- valid
  Dalyellia incerta (Böhmig, 1902) -- invalid
  Dalyellia inermis Graff, 1911 -- invalid
  Dalyellia inflata Okugawa, 1930 -- invalid
  Dalyellia infundibuliformis (Fuhrmann, 1894) -- invalid
  Dalyellia intermedia (Du Plessis, 1879) -- invalid
  Dalyellia japonica Okugawa, 1930 -- invalid
  Dalyellia karisalmica Nasonov, 1917 -- invalid
  Dalyellia karisalmica dupliparfera Weise, 1942 -- invalid
  Dalyellia karisalmica karisalmica Nasonov, 1917 -- invalid
  Dalyellia karisalmica oligochaeta Gieysztor, 1938 -- invalid
  Dalyellia karisalmica tabulifera Gieysztor, 1938 -- invalid
  Dalyellia kessleri (Plotnikow, 1906) -- invalid
  Dalyellia kharkowiensis (Markow, 1904) -- invalid
  Dalyellia koiwi Eggers, 1925 -- invalid
  Dalyellia kupelwieseri Meixner, 1915 -- invalid
  Dalyellia lugubris Reisinger, 1924 -- invalid
  Dalyellia lutheri Nasonov, 1917 -- invalid
  Dalyellia megacephala Higley, 1918 -- invalid
  Dalyellia microphthalma (Vejdovsky, 1895) -- invalid
  Dalyellia millportianus (Graff, 1882) -- invalid
  Dalyellia minima Riedel, 1932 -- invalid
  Dalyellia minima An der Lan, 1939 -- invalid
  Dalyellia mohicana Graff, 1911 -- invalid
  Dalyellia mollosovi Nasonov, 1920 -- invalid
  Dalyellia nanella Beklemischev, 1921 -- invalid
  Dalyellia nasonovi Fulinski and Szynal, 1933 -- invalid
  Dalyellia nigrifrons Karling, 1935 -- invalid
  Dalyellia nigropontica (Nasonov, 1919) -- invalid
  Dalyellia obscura Noreña-Janssen, 1995 -- valid
  Dalyellia oligocentra Steinböck, 1948 -- invalid
  Dalyellia oligochaeta Nasonov, 1920 -- invalid
  Dalyellia oligochaeta karisalmica Nasonov, 1917 -- invalid
  Dalyellia opaca Sibiriakova, 1929 -- invalid
  Dalyellia ornata Hofsten, 1907 -- invalid
  Dalyellia ornata drozdovicensis Fulinski, 1915 -- invalid
  Dalyellia oryzae Nasonov, 1929 -- invalid
  Dalyellia pachyderma Steinböck, 1931 -- invalid
  Dalyellia pallida Hofsten, 1907 -- invalid
  Dalyellia paucispinosa (Sekera, 1888) -- invalid
  Dalyellia pavimentata Beklemischev, 1919 -- invalid
  Dalyellia penicilla (Braun, 1885) -- valid
  Dalyellia penicilla diminuta Gieysztor, 1929 -- valid
  Dalyellia penicilla endoramula Weise, 1942 -- invalid
  Dalyellia penicilla henophora Weise, 1942 -- invalid
  Dalyellia penicilla minuita Gieysztor, 1938 -- valid
  Dalyellia penicilla penicilla (Braun, 1885) -- valid
  Dalyellia penicilla pugiofera Weise, 1942 -- invalid
  Dalyellia penicilla typica Gieysztor, 1934 -- valid
  Dalyellia penicilla variiramosa Szynal, 1932 -- invalid
  Dalyellia penicillatus (Schmidt, 1857) -- invalid
  Dalyellia picta (Schmidt, 1848) -- invalid
  Dalyellia picta toutriensis Fulinski and Szynal, 1933 -- invalid
  Dalyellia picta zarubincensis Fulinski and Szynal, 1933 -- invalid
  Dalyellia polychaeta Nasonov, 1919 -- invalid
  Dalyellia pseudopenicilla Szynal, 1932 -- invalid
  Dalyellia quadridens (Böhmig, 1898) -- invalid
  Dalyellia quadridensoides (Fuhrmann, 1914) -- invalid
  Dalyellia rheesi Graff, 1911 -- invalid
  Dalyellia rhombigera (Plotnikow, 1905) -- invalid
  Dalyellia rochesteriana Graff, 1911 -- invalid
  Dalyellia rossi Graff, 1911 -- invalid
  Dalyellia rossi tennesseensis Ruebush and Hayes, 1939 -- invalid
  Dalyellia rubra (Fuhrmann, 1894) -- invalid
  Dalyellia rubra caucasica Nasonov, 1919 -- invalid
  Dalyellia rubra frankia Nasonov, 1919 -- invalid
  Dalyellia rubra intermedia Gieysztor, 1931 -- invalid
  Dalyellia rubra macrovariata Weise, 1942 -- invalid
  Dalyellia rubra typica Gieysztor, 1931 -- invalid
  Dalyellia schmidtii (Graff, 1882) -- invalid
  Dalyellia scoparia (Schmidt, 1858) -- valid
  Dalyellia semispinosa Fulinski and Szynal, 1927 -- invalid
  Dalyellia sergia Beklemischev, 1919 -- invalid
  Dalyellia sibirica (Plotnikow, 1905) -- invalid
  Dalyellia sillimani Graff, 1911 -- invalid
  Dalyellia sinensis Wang, 2004 -- valid
  Dalyellia sphagnetica Beklemischev, 1921 -- invalid
  Dalyellia sphyrocephala Steinböck, 1931 -- invalid
  Dalyellia striata (Plotnikow, 1905) -- invalid
  Dalyellia styriaca Reisinger, 1924 -- valid
  Dalyellia succincta Hofsten, 1907 -- invalid
  Dalyellia tatrica Gieysztor, 1938 -- valid
  Dalyellia tatrica czarnohorica Gieysztor and Szynal, 1939 -- valid
  Dalyellia tatrica tatrica Gieysztor, 1938 -- valid
  Dalyellia taurica Nasonov, 1923 -- invalid
  Dalyellia thienemanni Reisinger, 1933 -- invalid
  Dalyellia transilvana (Paradi, 1882) -- invalid
  Dalyellia triangulata Robeson, 1931 -- invalid
  Dalyellia tridentata Szynal, 1932 -- invalid
  Dalyellia triquetra (Fuhrmann, 1894) -- invalid
  Dalyellia triquetra orientalis Nasonov, 1929 -- invalid
  Dalyellia truncata (Abildgaard, 1789) -- invalid
  Dalyellia tsurugae Nasonov, 1929 -- invalid
  Dalyellia upernivig Steinböck, 1932 -- valid
  Dalyellia variospinosa Fulinski and Szynal, 1933 -- invalid
  Dalyellia velox (Dalyell, 1814) -- invalid
  Dalyellia vinculosa Szynal, 1933 -- invalid
  Dalyellia virginiana Ruebush, 1937 -- invalid
  Dalyellia virgulifera (Plotnikow, 1906) -- invalid
  Dalyellia virgulifera vjatkensis Nasonov, 1919 -- invalid
  Dalyellia viridis (Shaw, 1791) -- valid
  Dalyellia viridis carolinensis Hyman, 1955 -- invalid
  Dalyellia wiszniewskii de Beauchamp, 1947 -- valid
  Dalyellia zykovi Nasonov, 1919 -- invalid
  Dalyelliidae Graff, 1905 -- valid
  Dalyellioida Bresslau, 1928 -- invalid
  Dalyellioidarum Steinböck, 1948 -- invalid
  Dalytyphloplanida Willems, Wallberg, Jondelius, Littlewood, Backeljau, Schockaert and Artois, 2006 -- invalid
  Danorhynchus Karling, 1955 -- valid
  Danorhynchus duplostylis Karling, 1955 -- valid
  Danorhynchus gosoeensis Karling, 1955 -- valid
  Darwinia Pereyaslawzewa, 1892 -- valid
  Darwinia albomaculata Pereyaslawzewa, 1892 -- valid
  Darwinia subtilis (Graff, 1882) -- invalid
  Darwinia variabilis Pereyaslawzewa, 1892 -- invalid
  Dasyhormus Marcus, 1945 -- valid
  Dasyhormus illiesi Schwank, 1980 -- valid
  Dasyhormus lasius Marcus, 1945 -- valid
  Dasyhormus lithophorus Marcus, 1945 -- valid
  Dasyhormus pygmaeus (Reisinger, 1924) -- valid
  Dasyhormus stygios Enright and Faubel, 2000 -- valid
  Debeauchampia Benazzi, 1981 -- invalid
  Debeauchampia anatolica Benazzi, 1981 -- invalid
  Decadidymus Cannon, 1991 -- valid
  Decadidymus gulosus Cannon, 1991 -- valid
  Dendrocoelidae Hallez, 1892 -- valid
  Dendrocoelides de Beauchamp, 1919 -- invalid
  Dendrocoelides abditum (Kenk, 1940) -- invalid
  Dendrocoelides archipannonicus Gelei, 1927 -- invalid
  Dendrocoelides atriostrictum (Codreanu and Balcesco, 1967) -- invalid
  Dendrocoelides banaticum (Codreanu and Balcesco, 1967) -- invalid
  Dendrocoelides barbnei (de Beauchamp, 1956) -- invalid
  Dendrocoelides benazii (Del Papa, 1973) -- invalid
  Dendrocoelides brachyphallus de Beauchamp, 1929 -- invalid
  Dendrocoelides carpathium (Komarek, 1926) -- invalid
  Dendrocoelides cavatica (Fries, 1874) -- invalid
  Dendrocoelides chappuisi (de Beauchamp, 1932) -- invalid
  Dendrocoelides clujanum (Codreanu, 1943) -- invalid
  Dendrocoelides codreanui (Gourbault, 1967) -- invalid
  Dendrocoelides coeca Komarek, 1926 -- invalid
  Dendrocoelides coiffaiti (de Beauchamp, 1956) -- invalid
  Dendrocoelides collini de Beauchamp, 1919 -- invalid
  Dendrocoelides debeauchampianum (Codreanu and Balcesco, 1967) -- invalid
  Dendrocoelides dumitrescuae (Gourbault, 1967) -- invalid
  Dendrocoelides hankoi Gelei, 1927 -- invalid
  Dendrocoelides italicum (Vialli, 1937) -- invalid
  Dendrocoelides kenki (de Beauchamp, 1937) -- invalid
  Dendrocoelides lescherae (Gourbault, 1970) -- invalid
  Dendrocoelides lipophallus de Beauchamp, 1929 -- invalid
  Dendrocoelides mrazeki (Vejdovsky, 1895) -- invalid
  Dendrocoelides mrazeki pannonica Méhely, 1927 -- invalid
  Dendrocoelides orghidani (Codreanu and Balcesco, 1967) -- invalid
  Dendrocoelides orghidani (Gourbault, 1967) -- invalid
  Dendrocoelides pannonicus Méhely, 1927 -- invalid
  Dendrocoelides polymorphum (Codreanu and Balcesco, 1967) -- invalid
  Dendrocoelides racovitzai (de Beauchamp, 1949) -- invalid
  Dendrocoelides regnardi de Beauchamp, 1919 -- invalid
  Dendrocoelides spelaea Kenk, 1924 -- invalid
  Dendrocoelides sphaerophallus de Beauchamp, 1929 -- invalid
  Dendrocoelides stenophallus (Codreanu and Balcesco, 1967) -- invalid
  Dendrocoelides tismanae (Codreanu and Balcesco, 1967) -- invalid
  Dendrocoelides tubuliferum (de Beauchamp, 1919) -- invalid
  Dendrocoelides tuzetae (Gourbault, 1965) -- invalid
  Dendrocoelides vaillanti (de Beauchamp, 1954) -- invalid
  Dendrocoelides voinovi (Codreanu, 1929) -- invalid
  Dendrocoelinae Hallez, 1892 -- invalid
  Dendrocoelopsis Kenk, 1930 -- valid
  Dendrocoelopsis alaskensis Kenk, 1953 -- valid
  Dendrocoelopsis americana (Hyman, 1939) -- valid
  Dendrocoelopsis beauchampi (Gourbault, 1969) -- valid
  Dendrocoelopsis bessoni Gourbault, Benazzi and Hellouet, 1976 -- valid
  Dendrocoelopsis borealis Ichikawa, 1954 -- invalid
  Dendrocoelopsis brementi (de Beauchamp, 1919) -- valid
  Dendrocoelopsis brementi brementi (de Beauchamp, 1919) -- valid
  Dendrocoelopsis brementi oculatum (Porfirieva, 1968) -- valid
  Dendrocoelopsis chattoni (de Beauchamp, 1949) -- valid
  Dendrocoelopsis ezensis Ichikawa and Okugawa, 1958 -- valid
  Dendrocoelopsis garmieri (de Beauchamp, 1950) -- valid
  Dendrocoelopsis hymanae Kawakatsu, 1968 -- valid
  Dendrocoelopsis ichikawai Kawakatsu, 1977 -- valid
  Dendrocoelopsis kishidae Kawakatsu, Ogawara and Tarui, 1978 -- valid
  Dendrocoelopsis lactea Ichikawa and Okugawa, 1958 -- valid
  Dendrocoelopsis oculata (Porfirieva, 1958) -- valid
  Dendrocoelopsis piriformis Kenk, 1953 -- valid
  Dendrocoelopsis sinensis Liu, 1997 -- valid
  Dendrocoelopsis spinosipenis (Kenk, 1925) -- valid
  Dendrocoelopsis suifenhensis Liu, 1997 -- valid
  Dendrocoelopsis vaginata Hyman, 1935 -- valid
  Dendrocoelopsis vandeli (de Beauchamp, 1931) -- valid
  Dendrocoelum Ĝrsted, 1844 -- valid
  Dendrocoelum abditum (Kenk, 1940) -- valid
  Dendrocoelum adenodactylosum (Stankovic and Komarek, 1927) -- valid
  Dendrocoelum affine Codreanu and Balcesco, 1970 -- valid
  Dendrocoelum agile de Beauchamp, 1932 -- valid
  Dendrocoelum alba (Linnaeus, 1746) -- invalid
  Dendrocoelum alba crenatum (O. F. Müller, 1773) -- invalid
  Dendrocoelum alba simplex Perkins, 1928 -- invalid
  Dendrocoelum albidum Kenk, 1978 -- valid
  Dendrocoelum album (Steinmann, 1910) -- valid
  Dendrocoelum alexandrinae Codreanu and Balcesco, 1970 -- valid
  Dendrocoelum amplum Harrath and Sluys, 2012 -- valid
  Dendrocoelum angarense (Gerstfeldt, 1858) -- invalid
  Dendrocoelum apodendrocoeloideum Dyganova, 1976 -- valid
  Dendrocoelum atriostrictum Codreanu and Balcesco, 1967 -- valid
  Dendrocoelum banaticum Codreanu and Balcesco, 1967 -- valid
  Dendrocoelum barbei de Beauchamp, 1956 -- valid
  Dendrocoelum beauchampi Del Papa, 1952 -- valid
  Dendrocoelum benazii Del Papa, 1973 -- valid
  Dendrocoelum boettgeri An der Lan, 1955 -- valid
  Dendrocoelum bohemicum Komarek and Kunst, 1956 -- valid
  Dendrocoelum botosaneanui Del Papa, 1970 -- valid
  Dendrocoelum brachyphallus (de Beauchamp, 1929) -- valid
  Dendrocoelum brandtii Böhmig, 1893 -- valid
  Dendrocoelum brunneomarginatum Böhmig, 1893 -- valid
  Dendrocoelum caecum (Komarek, 1926) -- valid
  Dendrocoelum carpathicum Komarek, 1926 -- valid
  Dendrocoelum caspicum Porfirieva and Dyganova, 1973 -- valid
  Dendrocoelum caucasicum Porfirieva, 1958 -- valid
  Dendrocoelum cavaticum (Fries, 1874) -- valid
  Dendrocoelum cavaticum sollaudi de Beauchamp, 1931 -- invalid
  Dendrocoelum chappuisi de Beauchamp, 1932 -- valid
  Dendrocoelum clujanum Codreanu, 1943 -- valid
  Dendrocoelum codreanui Gourbault, 1967 -- valid
  Dendrocoelum coecum (Komarek, 1926) -- valid
  Dendrocoelum coiffaiti de Beauchamp, 1956 -- valid
  Dendrocoelum collini (de Beauchamp, 1919) -- valid
  Dendrocoelum constrictum Harrath and Sluys, 2012 -- valid
  Dendrocoelum cruciferum (Stankovic, 1969) -- valid
  Dendrocoelum dani Bromley, 1982 -- valid
  Dendrocoelum debeauchampianum Codreanu and Balcesco, 1967 -- valid
  Dendrocoelum decemoculatum (Komarek, 1919) -- valid
  Dendrocoelum decoratum Kenk, 1978 -- valid
  Dendrocoelum dorsivittatum Kenk, 1978 -- valid
  Dendrocoelum dumitrescuae Gourbault, 1967 -- valid
  Dendrocoelum duplum Harrath and Sluys, 2012 -- valid
  Dendrocoelum findeneggi (Reisinger, 1971) -- valid
  Dendrocoelum fuscum (Pallas, 1774) -- valid
  Dendrocoelum geticum Codreanu and Balcesco, 1970 -- valid
  Dendrocoelum gineti de Beauchamp, 1954 -- valid
  Dendrocoelum graffi Wilhelmi, 1909 -- valid
  Dendrocoelum grimmi Dyganova, 1983 -- valid
  Dendrocoelum hankoi (Gelei, 1927) -- valid
  Dendrocoelum hercynicum Flossner, 1959 -- valid
  Dendrocoelum hussoni Sauber, 1970 -- valid
  Dendrocoelum inexspectatum Vila-Farré and Sluys, 2011 -- valid
  Dendrocoelum infernale (Steinmann, 1907) -- valid
  Dendrocoelum italicum Vialli, 1937 -- valid
  Dendrocoelum jablanicense (Stankovic and Komarek, 1927) -- valid
  Dendrocoelum kenki de Beauchamp, 1937 -- valid
  Dendrocoelum komareki (Stankovic, 1969) -- valid
  Dendrocoelum lactea (O. F. Müller, 1773) -- valid
  Dendrocoelum lactea bathycola (Steinmann, 1909) -- valid
  Dendrocoelum lactea crenatum (O. F. Müller, 1773) -- valid
  Dendrocoelum lactea croceum (Baer, 1827) -- valid
  Dendrocoelum lactea lactea (O. F. Müller, 1773) -- valid
  Dendrocoelum lactea simplex Perkins, 1928 -- valid
  Dendrocoelum lactea verbanense Benazzi, 1945 -- valid
  Dendrocoelum lacteum (O. F. Müller, 1773) -- invalid
  Dendrocoelum lacteum crenata (O. F. Müller, 1773) -- invalid
  Dendrocoelum lacteum verbanence Benazzi, 1945 -- invalid
  Dendrocoelum lacustre (Stankovic, 1938) -- valid
  Dendrocoelum lescherae Gourbault, 1970 -- valid
  Dendrocoelum lipophallus (de Beauchamp, 1929) -- valid
  Dendrocoelum longipenis Komarek, 1916 -- valid
  Dendrocoelum lychnidicum (Stankovic, 1969) -- valid
  Dendrocoelum maculatum (Stankovic and Komarek, 1927) -- valid
  Dendrocoelum magnum (Stankovic, 1969) -- valid
  Dendrocoelum minimum Kenk, 1978 -- valid
  Dendrocoelum mrazekii (Vejdovsky, 1895) -- valid
  Dendrocoelum mrazekii pannonicum (Méhely, 1927) -- invalid
  Dendrocoelum nausicaae Schmidt, 1861 -- valid
  Dendrocoelum ochridense (Stankovic and Komarek, 1927) -- valid
  Dendrocoelum orghidani Codreanu and Balcesco, 1967 -- valid
  Dendrocoelum orghidani Gourbault, 1967 -- invalid
  Dendrocoelum oxyhidoni Codreanu and Balcesco, 1967 -- valid
  Dendrocoelum panamicum (Méhely, 1927) -- invalid
  Dendrocoelum pannonicum (Méhely, 1927) -- valid
  Dendrocoelum parisi (de Beauchamp, 1929) -- invalid
  Dendrocoelum parvioculatum de Beauchamp, 1932 -- valid
  Dendrocoelum percoecum Packard, 1879 -- invalid
  Dendrocoelum plesiophthalmum de Beauchamp, 1937 -- valid
  Dendrocoelum polymorphum Codreanu and Balcesco, 1967 -- valid
  Dendrocoelum prespense (Stankovic, 1969) -- valid
  Dendrocoelum pulcherrimum Girard, 1850 -- valid
  Dendrocoelum punctatum (Pallas, 1774) -- invalid
  Dendrocoelum puteale Kenk, 1930 -- valid
  Dendrocoelum quadrioculatum (Graff, 1875) -- valid
  Dendrocoelum racovitzae de Beauchamp, 1949 -- valid
  Dendrocoelum regnaudi (de Beauchamp, 1919) -- valid
  Dendrocoelum remyi de Beauchamp, 1926 -- valid
  Dendrocoelum romanodanubiale (Codreanu, 1949) -- valid
  Dendrocoelum romanovae Dyganova, 1976 -- valid
  Dendrocoelum sanctinaumae (Stankovic and Komarek, 1927) -- valid
  Dendrocoelum sanctinaumi (Stankovic and Komarek, 1927) -- invalid
  Dendrocoelum sinisae Kenk, 1978 -- valid
  Dendrocoelum sollaudi de Beauchamp, 1931 -- valid
  Dendrocoelum spatiosum Vila-Farré and Sluys, 2011 -- valid
  Dendrocoelum spelaeum (Kenk, 1924) -- valid
  Dendrocoelum spelaeum caucasicum Porfirieva, 1958 -- invalid
  Dendrocoelum sphaerophallus (de Beauchamp, 1929) -- valid
  Dendrocoelum spinosipenis Kenk, 1925 -- invalid
  Dendrocoelum stenophallous Codreanu and Balcesco, 1967 -- valid
  Dendrocoelum subterraneum Komarek, 1919 -- valid
  Dendrocoelum superbum Girard, 1850 -- valid
  Dendrocoelum superficiale (Porfirieva, 1958) -- valid
  Dendrocoelum tismanae Codreanu and Balcesco, 1967 -- valid
  Dendrocoelum translucidum Kenk, 1978 -- valid
  Dendrocoelum truncatum (Leidy, 1851) -- valid
  Dendrocoelum tubuliferum de Beauchamp, 1919 -- valid
  Dendrocoelum tuzetae Gourbault, 1965 -- valid
  Dendrocoelum vaillanti de Beauchamp, 1954 -- valid
  Dendrocoelum vitta (A. L. Dugès, 1830) -- invalid
  Dendrocoelum vittatum Diesing, 1850 -- valid
  Dendrocoelum voinovi (Codreanu, 1929) -- valid
  Dendrocoelum warnimonti Hoffmann, 1964 -- valid
  Derostoma Ĝrsted, 1844 -- invalid
  Derostoma angusticeps A. L. Dugès, 1830 -- invalid
  Derostoma anophthalma Vejdovsky, 1895 -- invalid
  Derostoma balticum Braun, 1885 -- invalid
  Derostoma benedenii Francotte, 1883 -- invalid
  Derostoma catenula Leydig, 1854 -- invalid
  Derostoma claudiopolitanum Sekera, 1904 -- invalid
  Derostoma coecum Fuhrmann, 1894 -- invalid
  Derostoma craci (Schmidt, 1857) -- invalid
  Derostoma elongatum Schmarda, 1859 -- valid
  Derostoma erythrops Braun, 1885 -- invalid
  Derostoma flavicaris Ehrenberg, 1831 -- invalid
  Derostoma fodinae (Dalyell, 1853) -- invalid
  Derostoma foliaceum Böhmig, 1914 -- invalid
  Derostoma fusiformis A. L. Dugès, 1830 -- invalid
  Derostoma galizianum Schmidt, 1858 -- invalid
  Derostoma gracilis Vejdovsky, 1895 -- invalid
  Derostoma griseum (O. F. Müller, 1789) -- invalid
  Derostoma grossum (O. F. Müller, 1774) -- invalid
  Derostoma lanceolatum A. L. Dugès, 1828 -- invalid
  Derostoma laticeps A. L. Dugès, 1830 -- invalid
  Derostoma leucocelis Schmarda, 1859 -- invalid
  Derostoma leucops A. L. Dugès, 1828 -- invalid
  Derostoma limacina (Fabricius, 1826) -- invalid
  Derostoma lineare (O. F. Müller, 1773) -- invalid
  Derostoma megalops A. L. Dugès, 1830 -- invalid
  Derostoma mutabils A. L. Dugès, 1830 -- invalid
  Derostoma notops A. L. Dugès, 1828 -- invalid
  Derostoma platurus A. L. Dugès, 1828 -- invalid
  Derostoma polygastrum A. L. Dugès, 1828 -- invalid
  Derostoma rostratum (O. F. Müller, 1774) -- invalid
  Derostoma rufodorsata Sekera, 1903 -- invalid
  Derostoma salinarum Graff, 1882 -- invalid
  Derostoma schmidtianum Schultze, 1851 -- invalid
  Derostoma selenops A. L. Dugès, 1830 -- invalid
  Derostoma squalus A. L. Dugès, 1828 -- invalid
  Derostoma stagnalis Fuhrmann, 1900 -- invalid
  Derostoma truncatum Schmarda, 1859 -- invalid
  Derostoma typhlops Vejdovsky, 1880 -- invalid
  Derostoma unipunctatum Ĝrsted, 1843 -- invalid
  Derostoma viridatum (Abildgaard, 1789) -- invalid
  Derostoma viridis Schultze, 1851 -- invalid
  Desmorhynchinae Heinzel, 1929 -- invalid
  Desmorhynchus Heinzel, 1929 -- invalid
  Desmorhynchus angustus Hyman, 1941 -- invalid
  Desmorhynchus blainvillei (Graff, 1899) -- invalid
  Desmorhynchus hectori (Graff, 1897) -- invalid
  Desmorhynchus hectori inopinata de Beauchamp, 1930 -- invalid
  Desmorhynchus nematopsis de Beauchamp, 1930 -- invalid
  Desmorhynchus ochroleucus (Graff, 1899) -- invalid
  Desmorhynchus ochroleucus belli (Graff, 1899) -- invalid
  Desmorhynchus ochroleucus variam de Beauchamp, 1930 -- invalid
  Desmorhynchus pellucidus (Graff, 1899) -- invalid
  Desmorhynchus vejdovskyi (Graff, 1899) -- invalid
  Desmote Beklemischev, 1916 -- valid
  Desmote antarcticus Shinn, 1987 -- valid
  Desmote inops Kozloff, 1965 -- valid
  Desmote metacrini (Kaburaki, 1925) -- invalid
  Desmote vorax Beklemischev, 1916 -- valid
  Deuterogonaria Dörjes, 1968 -- valid
  Deuterogonaria carribea (Achatz, Hooge and Tyler, 2007) -- valid
  Deuterogonaria renei (Achatz and Hooge, 2006) -- valid
  Deuterogonaria thauma (Marcus, 1952) -- valid
  Diascorhynchidae Meixner, 1929 -- valid
  Diascorhynchides Schilke, 1970 -- valid
  Diascorhynchides arenaria Schilke, 1970 -- valid
  Diascorhynchus Meixner, 1928 -- valid
  Diascorhynchus borealis Meixner, 1928 -- valid
  Diascorhynchus brevicaudatus Meixner, 1929 -- invalid
  Diascorhynchus bucina Ehlers and Ehlers, 1980 -- valid
  Diascorhynchus caligatus Ax, 1959 -- valid
  Diascorhynchus collaris Karling, 1956 -- invalid
  Diascorhynchus glandulosus (de Beauchamp, 1927) -- valid
  Diascorhynchus lappvikensis Karling, 1963 -- valid
  Diascorhynchus rubrus Boaden, 1963 -- valid
  Diascorhynchus serpens Karling, 1949 -- valid
  Diatomovora Kozloff, 1965 -- valid
  Diatomovora amoena Kozloff, 1965 -- valid
  Diatomovora jacki Hooge and Tyler, 2008 -- valid
  Dicelis Schmarda, 1859 -- invalid
  Dicelis megalops Schmarda, 1859 -- invalid
  Diceratocephala Baer, 1953 -- valid
  Diceratocephala boschmai Baer, 1953 -- valid
  Diceratocephalidae Joffe, Cannon and Schockaert, 1998 -- valid
  Dicoelandropora Ax, 1956 -- valid
  Dicoelandropora atriopapillata Ax, 1956 -- valid
  Dicteroidae Faubel, 1984 -- valid
  Dicteros Jacubowa, 1906 -- valid
  Dicteros gamblei (Laidlaw, 1902) -- invalid
  Dicteros pacificus Jacubowa, 1906 -- valid
  Didangia Faubel, 1983 -- valid
  Didangia carneyi Quiroga, Bolaños and Litvaitis, 2008 -- valid
  Didangia mactanensis Faubel, 1983 -- valid
  Didangiidae Faubel, 1983 -- valid
  Didiadema Brunet, 1965 -- valid
  Didiadema picardi Brunet, 1965 -- valid
  Didymorchis Haswell, 1900 -- valid
  Didymorchis astacopsidis Haswell, 1900 -- valid
  Didymorchis cherapsis Haswell, 1900 -- valid
  Didymorchis haswelli Mane-Garzon, 1960 -- valid
  Didymorchis paranephropis Haswell, 1900 -- valid
  Digenobothrium Palombi, 1926 -- valid
  Digenobothrium inerme Palombi, 1926 -- valid
  Digonoporus An der Lan, 1941 -- valid
  Digonoporus macroposthia An der Lan, 1941 -- valid
  Digonopyla Fischer, 1926 -- valid
  Digonopyla harmeri (Graff, 1899) -- valid
  Digonopylidae Fischer, 1926 -- invalid
  Digynopora Hyman, 1940 -- valid
  Digynopora americana Hyman, 1940 -- valid
  Dimarcus Mitchell and Kawakatsu, 1972 -- invalid
  Dimarcus villalobosi Mitchell and Kawakatsu, 1972 -- invalid
  Dimarcusidae Mitchell and Kawakatsu, 1972 -- valid
  Dinizia Marcus, 1947 -- valid
  Dinizia divae Marcus, 1947 -- valid
  Dinizia sanctaehelenae Ball, 1977 -- valid
  Dioncus Stimpson, 1855 -- invalid
  Dioncus badius Stimpson, 1855 -- invalid
  Dioncus oblongus Stimpson, 1855 -- invalid
  Diopis Diesing, 1862 -- invalid
  Diopis borealis Gaimard, 1842-45 -- invalid
  Diopis megalops (Schmarda, 1859) -- invalid
  Diopisthoporidae Westblad, 1940 -- valid
  Diopisthoporus Westblad, 1940 -- valid
  Diopisthoporus brachypharyngeus Dörjes, 1968 -- valid
  Diopisthoporus gymnopharyngeus Smith and Tyler, 1985 -- valid
  Diopisthoporus lofolitis Hooge and Smith, 2004 -- valid
  Diopisthoporus longitubus Westblad, 1940 -- valid
  Diopisthoporus psammophilus Dörjes, 1968 -- valid
  Diopsis Diesing, 1862 -- invalid
  Diopsis borealis Diesing, 1862 -- invalid
  Diopsis megalops (Schmarda, 1859) -- invalid
  Diotis Schmarda, 1859 -- invalid
  Diotis grisea Schmarda, 1859 -- invalid
  Diplanaria Darwin, 1844 -- invalid
  Diplanaria notabilis Darwin, 1844 -- invalid
  Diplandros Hyman, 1953 -- valid
  Diplandros singularis Hyman, 1953 -- valid
  Diplehnia Faubel, 1983 -- valid
  Diplehnia caeca (Hyman, 1953) -- valid
  Diplehnia caeca caeca (Hyman, 1953) -- valid
  Diplehnia caeca oculifera (Hyman, 1953) -- valid
  Diplehnia pacifica (Kato, 1939) -- valid
  Diplonchus Stimpson, 1857 -- valid
  Diplonchus marmoratus Stimpson, 1857 -- valid
  Diplopenis Volz, 1898 -- invalid
  Diplopenis intermedius Volz, 1898 -- invalid
  Diplopenis tripeti Volz, 1898 -- invalid
  Diplopharyngeata Plehn, 1896 -- valid
  Diplopharyngeata filiformis Plehn, 1896 -- valid
  Diplopharyngeatidae Plehn, 1896 -- valid
  Diplosiphon Evdonin, 1977 -- valid
  Diplosiphon baikalensis (Rubtzoff, 1929) -- valid
  Diplosiphon beckmanae Timoshkin, 1986 -- invalid
  Diplosiphon livanovi Timoshkin, 1986 -- invalid
  Diplosiphon macrorhynchus Timoshkin, 1986 -- invalid
  Diplosiphon mamkaevi Timoshkin and Kawakatsu, 1996 -- valid
  Diplosiphon mamkaevi linius Timoshkin and Kawakatsu, 1996 -- valid
  Diplosiphon mamkaevi mamkaevi Timoshkin and Kawakatsu, 1996 -- valid
  Diplosiphon microstylus Timoshkin, 1986 -- invalid
  Diplosiphon ninae Timoshkin, 1986 -- invalid
  Diplosiphon tetrastylus Timoshkin, 1986 -- invalid
  Diplosiphon wadai Timoshkin and Kawakatsu, 1996 -- valid
  Diplosolenia Haswell, 1907 -- invalid
  Diplosolenia johnstoni Haswell, 1907 -- invalid
  Diplosoleniidae Bock, 1913 -- invalid
  Diporodemus Hyman, 1938 -- valid
  Diporodemus attemsi (Bendl, 1909) -- invalid
  Diporodemus hymanae C. G. Froehlich, 1972 -- valid
  Diporodemus indigenus Hyman, 1943 -- valid
  Diporodemus merridithae Glasgow, 2013 -- valid
  Diporodemus monacensis (Heinzel, 1929) -- invalid
  Diporodemus musculosus (de Beauchamp, 1930) -- invalid
  Diporodemus plenus Hyman, 1941 -- valid
  Diporodemus yucatani Hyman, 1938 -- valid
  Diporoplana Steinböck, 1932 -- invalid
  Diporoplana cnidophora (Steinböck, 1932) -- invalid
  Diporoplana fulgipenis (Steinböck, 1932) -- invalid
  Diposthidae Woodworth, 1898 -- valid
  Diposthus Woodworth, 1898 -- valid
  Diposthus corallicola Woodworth, 1898 -- valid
  Diposthus popeae Hyman, 1959 -- valid
  Discocelidae Laidlaw, 1903 -- valid
  Discocelides Bergendal, 1893 -- valid
  Discocelides ellipsoides (Girard in Stimpson, 1854) -- invalid
  Discocelides langi Bergendal, 1893 -- valid
  Discocelididae Laidlaw, 1903 -- valid
  Discocelis Ehrenberg, 1836 -- valid
  Discocelis australis Hyman, 1959 -- invalid
  Discocelis binoculata Verrill, 1901 -- invalid
  Discocelis cyclops Verrill, 1901 -- invalid
  Discocelis fulva Kato, 1944 -- valid
  Discocelis grisea Pearse, 1938 -- invalid
  Discocelis herdmani (Laidlaw, 1904) -- invalid
  Discocelis hollemani Maghsoudlou and Rahimian, 2013 -- valid
  Discocelis insularis Hyman, 1955 -- invalid
  Discocelis japonica Yeri and Kaburaki, 1918 -- valid
  Discocelis lactea (Stimpson, 1857) -- valid
  Discocelis lichenoides (Mertens, 1833) -- valid
  Discocelis mutabilis (Verrill, 1873) -- invalid
  Discocelis parvimaculata Beveridge, 2000 -- valid
  Discocelis persica Maghsoudlou and Rahimian, 2013 -- valid
  Discocelis pusilla Kato, 1938 -- valid
  Discocelis tigrina (Blanchard, 1847) -- valid
  Discoplana Bock, 1913 -- invalid
  Discoplana concolor (Meixner, 1907) -- invalid
  Discoplana gigas (Schmarda, 1859) -- invalid
  Discoplana inquieta (Heath and McGregor, 1912) -- invalid
  Discoplana longipenis Kato, 1943 -- invalid
  Discoplana malagasensis Doignon, Artois and Deheyn, 2003 -- invalid
  Discoplana malayana (Laidlaw, 1903) -- invalid
  Discoplana pacificola (Plehn, 1896) -- invalid
  Discoplana subviridis (Plehn, 1896) -- invalid
  Discoplana takewakii Kato, 1935 -- invalid
  Discoplana viridis (Plehn, 1896) -- invalid
  Discoprosthides Faubel, 1983 -- valid
  Discoprosthides patagoniensis Faubel, 1983 -- valid
  Discoprosthididae Faubel, 1983 -- valid
  Discosolenia Freeman, 1933 -- invalid
  Discosolenia washingtonensis Freeman, 1933 -- invalid
  Discosolenia washingtoniensis Freeman, 1933 -- invalid
  Discostylochus Bock, 1925 -- valid
  Discostylochus parcus Bock, 1925 -- valid
  Discostylochus yatsui Kato, 1937 -- valid
  Diskeria Schockaert, Curini-Galletti, De Ridder and Artois, 2011 -- valid
  Diskeria gigantea Schockaert, Curini-Galletti, De Ridder and Artois, 2011 -- valid
  Diskeria tasmanica Schockaert, Curini-Galletti, De Ridder and Artois, 2011 -- valid
  Disorus Diesing, 1862 -- invalid
  Disorus viridis Ehrenberg, 1831 -- invalid
  Disparoplana Laidlaw, 1903 -- valid
  Disparoplana dubia Laidlaw, 1903 -- valid
  Distigma Ehrenberg, 1831 -- invalid
  Distigma helluo (O. F. Müller, 1773) -- invalid
  Distigma planaria Ehrenberg, 1831 -- invalid
  Distigma proteus Ehrenberg, 1831 -- invalid
  Distigma tenax Ehrenberg, 1831 -- invalid
  Distylochus Faubel, 1983 -- valid
  Distylochus isifer (Du Bois-Reymond Marcus, 1955) -- valid
  Distylochus martae (Marcus, 1947) -- valid
  Distylochus pusillus (Bock, 1913) -- valid
  Ditremagenia Palombi, 1928 -- valid
  Ditremagenia macropharynx Palombi, 1928 -- valid
  Ditremageniidae Palombi, 1928 -- valid
  Ditremagenioidea Palombi, 1928 -- valid
  Diversibipalium Kawakatsu, Ogren, E. M. Froehlich, Takai and Sasaki, 2002 -- valid
  Diversibipalium andrewsi (Whitehouse, 1919) -- valid
  Diversibipalium bleekeri (Graff, 1899) -- valid
  Diversibipalium boehmigi (J. Müller, 1902) -- valid
  Diversibipalium brauni (Mell, 1903) -- valid
  Diversibipalium brunneum (Whitehouse, 1919) -- valid
  Diversibipalium cantori (Wright, 1860) -- valid
  Diversibipalium catenatum (Graff, 1899) -- valid
  Diversibipalium claparedei (Graff, 1899) -- valid
  Diversibipalium claviforme (Loman, 1890) -- valid
  Diversibipalium delicatum (Whitehouse, 1914) -- valid
  Diversibipalium dendrophilum (Schmarda, 1859) -- valid
  Diversibipalium dihangense (Whitehouse, 1914) -- valid
  Diversibipalium ellioti (Graff, 1899) -- invalid
  Diversibipalium engeli (Hartog, 1968) -- valid
  Diversibipalium everetti (Houghton, 1870) -- invalid
  Diversibipalium everetti longitudinalis (de Beauchamp, 1933) -- invalid
  Diversibipalium expeditionis (Loman, 1895) -- valid
  Diversibipalium falcatum (Graff, 1899) -- valid
  Diversibipalium fenestratum (Graff, 1898) -- invalid
  Diversibipalium ferudpoorense (Wright, 1860) -- valid
  Diversibipalium flowei (Graff, 1899) -- valid
  Diversibipalium fuligineum (Geba, 1909) -- valid
  Diversibipalium fulvum (Kaburaki, 1922) -- invalid
  Diversibipalium fuscocephalum (Kaburaki, 1922) -- valid
  Diversibipalium gebai (Geba, 1909) -- valid
  Diversibipalium giganteum (Whitehouse, 1914) -- valid
  Diversibipalium grandidieri (Mell, 1903) -- valid
  Diversibipalium grayi (Wright, 1860) -- invalid
  Diversibipalium gulliveri (Graff, 1899) -- invalid
  Diversibipalium haasei (Graff, 1899) -- valid
  Diversibipalium hasseltii (Loman, 1890) -- valid
  Diversibipalium hildebrandi (Graff, 1899) -- invalid
  Diversibipalium houghtoni (Moseley, 1874) -- invalid
  Diversibipalium indicum (Whitehouse, 1919) -- valid
  Diversibipalium isabellinum (Geba, 1909) -- valid
  Diversibipalium jalorense (Laidlaw, 1903) -- valid
  Diversibipalium jansei (Muller, 1907) -- valid
  Diversibipalium keshavi (Saxena, 1957) -- valid
  Diversibipalium kirkpatricki (Graff, 1899) -- valid
  Diversibipalium koreense (Frieb, 1923) -- valid
  Diversibipalium kuhlii (Loman, 1890) -- valid
  Diversibipalium layardi (Graff, 1899) -- invalid
  Diversibipalium lehnerti (Graff, 1898) -- invalid
  Diversibipalium lomani (Graff, 1898) -- invalid
  Diversibipalium longitudinalis (de Beauchamp, 1933) -- valid
  Diversibipalium lunatum (Gray, 1831) -- valid
  Diversibipalium maculatum (Stimpson, 1857) -- valid
  Diversibipalium madagascarense (Graff, 1899) -- valid
  Diversibipalium marenzelleri (Mell, 1903) -- valid
  Diversibipalium megacephalum (J. Müller, 1902) -- valid
  Diversibipalium modiglianii (Graff, 1894) -- invalid
  Diversibipalium molle (Graff, 1899) -- valid
  Diversibipalium multilineaum (Makino and Shirasawa, 1983) -- valid
  Diversibipalium murinum (Graff, 1899) -- valid
  Diversibipalium natunense (Meixner, 1906) -- valid
  Diversibipalium negritorum (Graff, 1899) -- valid
  Diversibipalium nigrilumbe (Loman, 1890) -- valid
  Diversibipalium ocellatum (Graff, 1898) -- invalid
  Diversibipalium olivaceps (Geba, 1909) -- valid
  Diversibipalium piceum (Graff, 1899) -- invalid
  Diversibipalium pictum (Geba, 1909) -- valid
  Diversibipalium quadricinctum (Loman, 1890) -- valid
  Diversibipalium rauchi (Graff, 1899) -- valid
  Diversibipalium richtersi (Graff, 1899) -- valid
  Diversibipalium ridleyi (Graff, 1899) -- valid
  Diversibipalium roonwali (Ramakrishna and Chauhan, 1962) -- valid
  Diversibipalium rotungense (Whitehouse, 1914) -- valid
  Diversibipalium ruteofulvum (Kaburaki, 1922) -- invalid
  Diversibipalium salvini (Graff, 1899) -- valid
  Diversibipalium sarasini (J. Müller, 1907) -- valid
  Diversibipalium sexcinctum (Loman, 1890) -- valid
  Diversibipalium shipleyi (Graff, 1899) -- valid
  Diversibipalium simplex (Graff, 1898) -- invalid
  Diversibipalium smithi (Graff, 1899) -- invalid
  Diversibipalium solmsi (Graff, 1899) -- valid
  Diversibipalium sordidum (Whitehouse, 1914) -- valid
  Diversibipalium splendens (Whitehouse, 1919) -- valid
  Diversibipalium steindachneri (Graff, 1899) -- valid
  Diversibipalium stimpsoni (Diesing, 1862) -- valid
  Diversibipalium sumatrense (Loman, 1883) -- valid
  Diversibipalium superbum (Graff, 1899) -- valid
  Diversibipalium sylvestre (Whitehouse, 1919) -- valid
  Diversibipalium tamatavense (Graff, 1899) -- valid
  Diversibipalium tau (Mell, 1903) -- valid
  Diversibipalium tennenti (Diesing, 1862) -- valid
  Diversibipalium transversefasciatum (J. Müller, 1907) -- valid
  Diversibipalium trilineatum (Stimpson, 1857) -- invalid
  Diversibipalium tripartitum (Graff, 1899) -- valid
  Diversibipalium unicolor (Moseley, 1877) -- valid
  Diversibipalium vinosum (Kaburaki, 1925) -- valid
  Diversibipalium virchowi (Graff, 1899) -- valid
  Diversibipalium virgatum (Stimpson, 1857) -- valid
  Diversibipalium vittatum (Loman, 1888) -- valid
  Diversibipalium weberi (Loman, 1890) -- valid
  Diversibipalium whitehousei (Ogren and Kawakatsu, 1987) -- valid
  Diversibipalium wrighti (Graff, 1899) -- valid
  Djeziraia Schockaert, 1971 -- valid
  Djeziraia euxinica (Mack-Fira, 1971) -- valid
  Djeziraia incana Artois and Schockaert, 2001 -- valid
  Djeziraia longistyla Noreña, Damborenea, Faubel and Brusa, 2007 -- valid
  Djeziraia pardii Schockaert, 1971 -- valid
  Dochmiotrema von Hofsten, 1907 -- valid
  Dochmiotrema limicola Hofsten, 1907 -- valid
  Dochmiotrema paradoxa (Findenegg, 1924) -- invalid
  Dochmiotrema valaamica (Nasonov, 1917) -- invalid
  Dolichomacrostomidae Rieger, 1971 -- valid
  Dolichomacrostominae Rieger, 1971 -- valid
  Dolichomacrostomum Luther, 1947 -- valid
  Dolichomacrostomum lutheri Marcus, 1948 -- invalid
  Dolichomacrostomum mortenseni Marcus, 1950 -- invalid
  Dolichomacrostomum uniporum Luther, 1947 -- valid
  Dolichomicrostomida Janssen, Vizoso, Schulte, Littlewood, Waeschenbach and Schärer, 2015 -- valid
  Dolichoplana Moseley, 1877 -- valid
  Dolichoplana bosci Graff, 1899 -- invalid
  Dolichoplana carvalhoi Correa, 1947 -- valid
  Dolichoplana conradti Graff, 1899 -- invalid
  Dolichoplana feildeni Graff, 1899 -- invalid
  Dolichoplana harmeri Graff, 1899 -- invalid
  Dolichoplana joubini Hallez, 1894 -- invalid
  Dolichoplana mertoni Schröder, 1916 -- invalid
  Dolichoplana nietneri (Humbert and Claparède, 1862) -- invalid
  Dolichoplana picta Graff, 1899 -- invalid
  Dolichoplana procera Graff, 1899 -- invalid
  Dolichoplana signata Graff, 1899 -- invalid
  Dolichoplana striata Moseley, 1877 -- valid
  Dolichoplana tristis Graff, 1899 -- invalid
  Dolichoplana vircata Du Bois-Reymond Marcus, 1957 -- valid
  Dolichoplana voeltzkowi Graff, 1899 -- invalid
  Doliopharynx Ehlers, 1972 -- valid
  Doliopharynx geminocirro Ehlers, 1972 -- valid
  Doris Pennant, 1777 -- invalid
  Doris electrina Pennant, 1777 -- invalid
  Drepanilla Ehlers, 1979 -- valid
  Drepanilla limophila Ehlers, 1979 -- valid
  Drepanorhynchides L'Hardy, 1966 -- valid
  Drepanorhynchides diodontus L'Hardy, 1966 -- valid
  Drepanorhynchides hastatus (Meixner, 1929) -- valid
  Drepanorhynchus L'Hardy, 1963 -- invalid
  Dreuxiola Schockaert, Curini-Galletti, De Ridder, Volonterio and Artois, 2009 -- valid
  Dreuxiola philippi Schockaert, Curini-Galletti, De Ridder, Volonterio and Artois, 2009 -- valid
  Dugesia Girard, 1850 -- valid
  Dugesia aberana Neppi, 1904 -- invalid
  Dugesia aborensis (Whitehouse, 1913) -- invalid
  Dugesia absoloni (Komarek, 1919) -- valid
  Dugesia aenigma De Vries, 1984 -- valid
  Dugesia aethiopica Stocchini, Corso, Manuni and Pala, 2002 -- valid
  Dugesia afromontana Stocchino and Sluys, 2012 -- valid
  Dugesia agilis (Stringer, 1909) -- invalid
  Dugesia alpina (Dana, 1766) -- invalid
  Dugesia ambigua (Böhmig, 1902) -- invalid
  Dugesia anceps (Kenk, 1930) -- invalid
  Dugesia anceps maculata (Borelli, 1895) -- invalid
  Dugesia andamanensis (Kaburaki, 1925) -- valid
  Dugesia anderlani Kawakatsu and Hauser, 1983 -- invalid
  Dugesia andina (Borelli, 1895) -- invalid
  Dugesia annandalei (Kaburaki, 1918) -- valid
  Dugesia antillana Kenk, 1941 -- invalid
  Dugesia arabica Harrath and Sluys, 2013 -- valid
  Dugesia arcadia De Vries, 1988 -- valid
  Dugesia ariadnae De Vries, 1984 -- valid
  Dugesia arimana Hyman, 1957 -- invalid
  Dugesia arndti Marcus, 1946 -- invalid
  Dugesia artesiana Sluys and Grant, 2007 -- valid
  Dugesia astrocheta Marcus, 1953 -- valid
  Dugesia austroasiatica Kawakatsu, 1985 -- valid
  Dugesia bactriana de Beauchamp, 1959 -- valid
  Dugesia bakurianica Porfirieva, 1958 -- valid
  Dugesia barbarae Mitchell and Kawakatsu, 1973 -- invalid
  Dugesia barroisi (Whitehouse, 1914) -- invalid
  Dugesia batuensis Ball, 1970 -- valid
  Dugesia benazzii Lepori, 1951 -- valid
  Dugesia bengalensis Kawakatsu, 1983 -- valid
  Dugesia biblica Benazzi and Banchetti, 1973 -- valid
  Dugesia bifida Stocchino and Sluys, 2014 -- valid
  Dugesia bilineata (Kaburaki, 1918) -- invalid
  Dugesia boehmigi (Weiss, 1909) -- invalid
  Dugesia bonaerensis Moretto, 1996 -- invalid
  Dugesia borneana Kawakatsu, 1972 -- valid
  Dugesia brachycephala (Böhmig, 1897) -- valid
  Dugesia brigantii De Vries and Benazzi, 1983 -- valid
  Dugesia burmaensis (Kaburaki, 1918) -- valid
  Dugesia camara (Ball, 1977) -- invalid
  Dugesia cameliae (Fuhrmann, 1914) -- invalid
  Dugesia capensis Sluys, 2007 -- valid
  Dugesia chichkovi (Hranova, 1929) -- valid
  Dugesia chilla Marcus, 1954 -- invalid
  Dugesia colapha Dahm, 1967 -- invalid
  Dugesia congolensis de Beauchamp, 1951 -- invalid
  Dugesia cretica (Meixner, 1928) -- valid
  Dugesia cubana Codreanu and Balcesco, 1973 -- invalid
  Dugesia damoae De Vries, 1984 -- valid
  Dugesia debeauchampi De Vries, 1988 -- valid
  Dugesia deharvengi Kawakatsu and Mitchell, 1989 -- valid
  Dugesia diabolis Hyman, 1956 -- invalid
  Dugesia didiaphragma De Vries, 1988 -- valid
  Dugesia dimorpha (Böhmig, 1902) -- invalid
  Dugesia dorotocephala (Woodworth, 1897) -- invalid
  Dugesia dubia (Borelli, 1895) -- valid
  Dugesia ectophysa Marcus, 1953 -- valid
  Dugesia elegans De Vries, 1984 -- valid
  Dugesia etrusca Benazzi, 1944 -- valid
  Dugesia etrusca biodenodactyla Benazzi, 1965 -- valid
  Dugesia etrusca biodenodattila Lepori, 1950 -- valid
  Dugesia etrusca etrusca Benazzi, 1944 -- valid
  Dugesia etrusca labronica Lepori, 1950 -- valid
  Dugesia etrusca monoadenodactyla Lepori, 1947 -- valid
  Dugesia etrusca monodactyla Lepori, 1950 -- valid
  Dugesia evelinae (Marcus, 1955) -- invalid
  Dugesia falklandica (Westblad, 1952) -- invalid
  Dugesia festae (Borelli, 1898) -- invalid
  Dugesia festae albolineata (Borelli, 1898) -- invalid
  Dugesia fissipara (Kennel, 1888) -- valid
  Dugesia foeni Ball, 1977 -- valid
  Dugesia fontinalis (Nurse, 1950) -- valid
  Dugesia foremanii Girard, 1852 -- invalid
  Dugesia glandulosa (Kenk, 1930) -- invalid
  Dugesia golanica Bromley and Benazzi, 1991 -- valid
  Dugesia gonocephala (A. L. Dugès, 1830) -- valid
  Dugesia gonocephala bakurianica Porfirieva, 1958 -- invalid
  Dugesia gonocephala gonocephala (A. L. Dugès, 1830) -- valid
  Dugesia gonocephala ilvana Lepori, 1948 -- invalid
  Dugesia gonocephala meridionalis Benazzi, 1961 -- valid
  Dugesia gonocephala praecaucasica Porfirieva, 1958 -- valid
  Dugesia gonocephala subtentaculata (Draparnaud, 1803) -- invalid
  Dugesia gonocephala taurocaucasica (Livanov, 1951) -- valid
  Dugesia gonocephaloides Girard, 1850 -- valid
  Dugesia graffi (Weiss, 1909) -- invalid
  Dugesia guatemalensis Mitchell and Kawakatsu, 1973 -- invalid
  Dugesia hepta Pala, Casu and Vacca, 1981 -- valid
  Dugesia hoernesi (Weiss, 1909) -- invalid
  Dugesia hymanae (Sivickis, 1928) -- valid
  Dugesia hypoglauca Marcus, 1948 -- invalid
  Dugesia iberica Gourbault and Benazzi, 1979 -- invalid
  Dugesia iheringii (Böhmig, 1887) -- valid
  Dugesia ilvana Lepori, 1948 -- valid
  Dugesia indica Kawakatsu, 1969 -- valid
  Dugesia indonesiana Kawakatsu, 1973 -- valid
  Dugesia iranica (Livanov, 1951) -- valid
  Dugesia izuensis Kato, 1943 -- valid
  Dugesia japonica Ichikawa and Kawakatsu, 1964 -- valid
  Dugesia japonica ryukyuensis Kawakatsu, 1976 -- invalid
  Dugesia jeanneli (de Beauchamp, 1913) -- invalid
  Dugesia jenkinsae Benazzi and Gourbault, 1977 -- invalid
  Dugesia jimi Martins, 1970 -- invalid
  Dugesia krishnaswamyi Kawakatsu, 1975 -- valid
  Dugesia lamottei de Beauchamp, 1952 -- valid
  Dugesia lanzai Banchetti and Del Papa, 1972 -- valid
  Dugesia lata (Sivickis, 1923) -- valid
  Dugesia laurentiana (Borelli, 1897) -- valid
  Dugesia leclerci Kawakatsu and Mitchell, 1995 -- valid
  Dugesia leporii Pala, Stocchino, Corso and Casu, 2000 -- valid
  Dugesia libanica Bromley and Benazzi, 1991 -- valid
  Dugesia liguriensis De Vries, 1988 -- valid
  Dugesia lindbergi de Beauchamp, 1959 -- valid
  Dugesia longistriata (Fuhrmann, 1914) -- invalid
  Dugesia lugubris (Schmidt, 1861) -- invalid
  Dugesia lugubris wytegrensis (Sabussow, 1907) -- invalid
  Dugesia machadoi de Beauchamp, 1952 -- valid
  Dugesia mackenziei Mitchell and Kawakatsu, 1973 -- invalid
  Dugesia maculata (Leidy, 1847) -- valid
  Dugesia maghrebiana Stocchino, Manconi, Corso, Sluys, Casu and Pala, 2009 -- valid
  Dugesia malickyi De Vries, 1984 -- valid
  Dugesia mediterranea Benazzi, Baguna, Ballester and Del Papa, 1975 -- invalid
  Dugesia mertoni (Steinmann, 1914) -- valid
  Dugesia michaelsoni (Böhmig, 1902) -- valid
  Dugesia microbursalis (Hyman, 1931) -- valid
  Dugesia milloti de Beauchamp, 1952 -- valid
  Dugesia minotauros De Vries, 1984 -- valid
  Dugesia mirabilis De Vries, 1988 -- valid
  Dugesia modesta Girard, 1893 -- valid
  Dugesia monomyoda Marcus, 1953 -- valid
  Dugesia montana Nurse, 1950 -- valid
  Dugesia montana albolineata Nurse, 1950 -- valid
  Dugesia montana montana Nurse, 1950 -- valid
  Dugesia myopa De Vries, 1988 -- valid
  Dugesia nannophallus Ball, 1970 -- valid
  Dugesia nansheae De Vries, 1988 -- valid
  Dugesia neumanni (Neppi, 1904) -- valid
  Dugesia nonatoi Marcus, 1946 -- valid
  Dugesia notogaea Sluys and Kawakatsu, 1998 -- valid
  Dugesia novaguineana Kawakatsu, 1976 -- valid
  Dugesia paeta (Marcus, 1955) -- invalid
  Dugesia paramensis (Fuhrmann, 1914) -- invalid
  Dugesia patagonica (Borelli, 1901) -- invalid
  Dugesia persica Behzad, Masoud and Mahmood, 1998 -- invalid
  Dugesia pinguis (Weiss, 1910) -- invalid
  Dugesia polychroa (Schmidt, 1861) -- invalid
  Dugesia polyorchis (Fuhrmann, 1914) -- valid
  Dugesia praecaucasica Porfirieva, 1958 -- invalid
  Dugesia rava (Weiss, 1909) -- invalid
  Dugesia rincona Marcus, 1954 -- invalid
  Dugesia ryukyuensis Kawakatsu, 1976 -- valid
  Dugesia sagitta (Schmidt, 1861) -- valid
  Dugesia salina (Whitehouse, 1914) -- invalid
  Dugesia sanchezi Hyman, 1955 -- invalid
  Dugesia schauinslandi (Neppi, 1904) -- valid
  Dugesia schubarti (Marcus, 1946) -- invalid
  Dugesia seclusa (de Beauchamp, 1940) -- valid
  Dugesia siamana Kawakatsu, 1980 -- valid
  Dugesia sicula Lepori, 1948 -- valid
  Dugesia similis (Böhmig, 1902) -- valid
  Dugesia sinensis Chen and Wang, 2015 -- valid
  Dugesia subtentaculata (Draparnaud, 1803) -- valid
  Dugesia sudanica Dahm, 1971 -- invalid
  Dugesia superioris Stocchino and Sluys, 2013 -- valid
  Dugesia tahitiensis Gourbault, 1977 -- invalid
  Dugesia tamilensis Kawakatsu, 1980 -- valid
  Dugesia tanganyikae (Laidlaw, 1906) -- valid
  Dugesia taurocaucasica (Livanov, 1951) -- invalid
  Dugesia tiberiensis (Whitehouse, 1914) -- invalid
  Dugesia tigrina (Girard, 1850) -- invalid
  Dugesia tinga (Marcus, 1955) -- invalid
  Dugesia titicacana Hyman, 1939 -- invalid
  Dugesia torva (O. F. Müller, 1774) -- invalid
  Dugesia transcaucasica (Livanov, 1951) -- valid
  Dugesia tubqalis Harrath and Sluys, 2012 -- valid
  Dugesia typhlomexicana Mitchell and Kawakatsu, 1973 -- invalid
  Dugesia uenorum Kawakatsu and Mitchell, 1995 -- valid
  Dugesia ururiograndeana Kawakatsu, Hauser and Ponce de Leon, 1992 -- invalid
  Dugesia veneranda Martins, 1970 -- invalid
  Dugesia venusta (Böhmig, 1897) -- valid
  Dugesia vestibularis De Vries, 1988 -- valid
  Dugesia wimbimba (Marcus, 1970) -- invalid
  Dugesia wytegrensis (Sabussow, 1907) -- valid
  Dugesiidae Ball, 1974 -- valid
  Dunlopea Wright, 1860 -- invalid
  Dunlopea cantorea Wright, 1860 -- invalid
  Dunlopea ferudpoorensis Wright, 1860 -- invalid
  Dunlopea grayia Wright, 1860 -- invalid
  Dunwichia Faubel, Blome and Cannon, 1994 -- valid
  Dunwichia arenosa Faubel, Blome and Cannon, 1994 -- valid
  Duplacrorhynchinae Schockaert and Karling, 1970 -- invalid
  Duplacrorhynchus Schockaert and Karling, 1970 -- valid
  Duplacrorhynchus heyleni Artois and Schockaert, 1999 -- valid
  Duplacrorhynchus major Schockaert and Karling, 1970 -- valid
  Duplacrorhynchus megalophallus Artois and Schockaert, 1999 -- valid
  Duplacrorhynchus minor Schockaert and Karling, 1970 -- valid
  Duplexostylus Willems, Schockaert and Artois, 2006 -- valid
  Duplexostylus rowei Willems, Schockaert and Artois, 2006 -- valid
  Duplexostylus winsori Willems, Schockaert and Artois, 2006 -- valid
  Duplominona Karling, 1967 -- valid
  Duplominona amnica (Ball and Hay, 1977) -- valid
  Duplominona axi Martens and Curini-Galletti, 1989 -- valid
  Duplominona brasiliensis Curini-Galletti, 2014 -- valid
  Duplominona canariensis Ehlers and Ehlers, 1980 -- valid
  Duplominona canariensis bermudiensis Ax and Sopott-Ehlers, 1985 -- valid
  Duplominona canariensis canariensis Ehlers and Ehlers, 1980 -- valid
  Duplominona corsicana Martens, 1984 -- valid
  Duplominona cynaroides Martens and Curini-Galletti, 1989 -- valid
  Duplominona darwinensis Martens and Curini-Galletti, 1989 -- valid
  Duplominona filiformis Ax, 2008 -- valid
  Duplominona galapagoensis Ax and Ax, 1977 -- valid
  Duplominona istanbulensis (Ax, 1959) -- valid
  Duplominona japonica Ax, 2008 -- valid
  Duplominona kaneohei Karling, Mack-Fira and Dörjes, 1972 -- valid
  Duplominona karlingi Ax and Ax, 1977 -- valid
  Duplominona krameri Ax and Ax, 1977 -- valid
  Duplominona longicirrus Martens, 1984 -- valid
  Duplominona makassarensis Martens and Curini-Galletti, 1989 -- valid
  Duplominona mica (Marcus, 1951) -- valid
  Duplominona muslimini Martens and Curini-Galletti, 1989 -- valid
  Duplominona paucispina Martens, 1984 -- valid
  Duplominona samalonae Martens and Curini-Galletti, 1989 -- valid
  Duplominona septentrionalis Martens, 1983 -- valid
  Duplominona sieversi Ax and Ax, 1977 -- valid
  Duplominona stilifera Sopott-Ehlers and Ax, 1985 -- valid
  Duplominona sulawesiensis Martens and Curini-Galletti, 1989 -- valid
  Duplominona tridens (Marcus, 1954) -- valid
  Duplominona westbladi Karling, 1967 -- invalid
  Duplomonocelidinae Litvaitis, Curini-Galletti, Martens and Kocher, 1996 -- valid
  Duploperaclistus Martens, 1983 -- valid
  Duploperaclistus circocirrus Martens, 1983 -- valid
  Duploperaclistus garudae Martens and Curini-Galletti, 1989 -- valid
  Duploperaclistus westbladi (Karling, 1967) -- valid
  Echinoplana Haswell, 1907 -- valid
  Echinoplana celerrima Haswell, 1907 -- valid
  Echinoplana tenerrima Haswell, 1907 -- invalid
  Ectocotyla Hyman, 1944 -- valid
  Ectocotyla hirudo (Levinsen, 1879) -- valid
  Ectocotyla multitesticulata Fleming and Burt, 1978 -- valid
  Ectocotyla paguri Hyman, 1944 -- invalid
  Ectoplana Kaburaki, 1917 -- valid
  Ectoplana limuli (Ijima and Kaburaki, 1916) -- valid
  Ectoplana undata Sluys, 1986 -- valid
  Ectoplaninae Bresslau, 1933 -- valid
  Einarella Luther, 1948 -- valid
  Einarella argillophyla Luther, 1948 -- valid
  Einarhelmins Karling, 1993 -- valid
  Einarhelmins mutsa (Marcus, 1952) -- valid
  Einarhelmins stilifera (Westblad, 1955) -- valid
  Elasmodes Le Conte, 1851 -- invalid
  Elasmodes acutus (Stimpson, 1855) -- invalid
  Elasmodes discus Le Conte, 1851 -- invalid
  Elasmodes flexilis (Dalyell, 1814) -- invalid
  Elasmodes gracilis (Girard, 1850) -- invalid
  Elasmodes modestus (Quatrefage, 1845) -- invalid
  Elasmodes obtusus Collingwood, 1876 -- invalid
  Elasmodes pallida (Quatrefage, 1845) -- invalid
  Elasmodes tenellus Stimpson, 1857 -- invalid
  Elasmodes tigrinus (Blanchard, 1847) -- invalid
  Elattodemus Haslauer-Gamisch, 1982 -- invalid
  Elattodemus steinboecki Haslauer-Gamisch, 1982 -- invalid
  Eldenia Ax, 2008 -- valid
  Eldenia reducta Ax, 2008 -- valid
  Elvertia Noldt, 1989 -- valid
  Elvertia krusei Noldt, 1989 -- valid
  Emprosthommatidea Bock, 1913 -- invalid
  Emprosthopharyngidae Bock, 1913 -- invalid
  Emprosthopharynx Bock, 1913 -- valid
  Emprosthopharynx gracilis (Heath and McGregor, 1912) -- valid
  Emprosthopharynx hancocki (Hyman, 1953) -- valid
  Emprosthopharynx opisthoporus Bock, 1913 -- valid
  Emprosthopharynx pallida (Quatrefage, 1845) -- valid
  Emprosthopharynx rasae Prudhoe, 1968 -- valid
  Emprosthopharynx vanhoffeni Bock, 1931 -- valid
  Enantia Graff, 1889 -- valid
  Enantia pellucida (Pearse, 1938) -- invalid
  Enantia spinifera Graff, 1889 -- valid
  Enantiidae Graff, 1889 -- valid
  Enchiridium Bock, 1913 -- valid
  Enchiridium delicatum (Palombi, 1939) -- valid
  Enchiridium evelinae Marcus, 1949 -- valid
  Enchiridium gabriellae (Marcus, 1949) -- valid
  Enchiridium japonicum Kato, 1943 -- valid
  Enchiridium periommatum Bock, 1913 -- valid
  Enchiridium punctatum Hyman, 1953 -- valid
  Enchiridium russoi (Palombi, 1939) -- valid
  Endeavouria Ogren and Kawakatsu, 1991 -- valid
  Endeavouria septemlineata (Hyman, 1939) -- valid
  Endoaxonemata Jondelius and Thollesson, 1993 -- invalid
  Endocelis Schmankewitsch, 1873 -- valid
  Endocelis ovata Schmankewitsch, 1873 -- valid
  Endocincta Crezee, 1975 -- valid
  Endocincta punctata Crezee, 1975 -- valid
  Enterogonia Haswell, 1907 -- invalid
  Enterogonia orbicularis (Schmarda, 1859) -- invalid
  Enterogonia orbicularis pigrans Haswell, 1907 -- invalid
  Enterogonia pigrans Haswell, 1907 -- invalid
  Enterogonia pigrans novae-zealandica Bock, 1925 -- invalid
  Enterogonia pigrans novaezeylandiae Bock, 1925 -- invalid
  Enterogonimus Hallez, 1913 -- valid
  Enterogonimus aureus Hallez, 1913 -- valid
  Enterostoma austriacum Graff, 1882 -- invalid
  Enterostomula Reisinger, 1926 -- valid
  Enterostomula capitatum (Uljanin, 1870) -- invalid
  Enterostomula catinosa (Beklemischev, 1927) -- invalid
  Enterostomula crassicystifera Westblad, 1952 -- invalid
  Enterostomula dura (Fuhrmann, 1896) -- invalid
  Enterostomula evelinae Marcus, 1948 -- valid
  Enterostomula graffi (de Beauchamp, 1913) -- valid
  Enterostomula ronis Marcus, 1954 -- valid
  Enterostomula uterina Westblad, 1952 -- invalid
  Enterostomum Claparède, 1861 -- invalid
  Enterostomum austriacum Graff, 1882 -- invalid
  Enterostomum caecum Graff, 1882 -- invalid
  Enterostomum capitatum Uljanin, 1870 -- invalid
  Enterostomum catinosa (Beklemischev, 1927) -- invalid
  Enterostomum coecum Graff, 1882 -- invalid
  Enterostomum fingalianum Claparède, 1861 -- invalid
  Enterostomum flavibacillum Jensen, 1878 -- invalid
  Enterostomum mytili Sabussow, 1900 -- invalid
  Enterostomum striatum (Graff, 1878) -- invalid
  Enterostomum zooxanthella Graff, 1886 -- invalid
  Enterosyringa Ogren and Kawakatsu, 1990 -- valid
  Enterosyringa pseudorhynchodemus (Riester, 1938) -- valid
  Eolidiceros Quatrefage, 1845 -- invalid
  Eolidiceros brocchi (Risso, 1818) -- invalid
  Eolidiceros panormis Quatrefage, 1845 -- invalid
  Ependytes Picken, 1937 -- invalid
  Ependytes macedonicus Picken, 1937 -- invalid
  Espegrendia Westblad, 1954 -- valid
  Espegrendia norvegica Westblad, 1954 -- valid
  Ethmorhynchus Meixner, 1938 -- valid
  Ethmorhynchus anophtalmus Meixner, 1938 -- invalid
  Ethmorhynchus anophthalmus Meixner, 1938 -- valid
  Ethmorhynchus youngi Kolasa, 1977 -- valid
  Etmorhynchus Meixner, 1938 -- invalid
  Eucestoplana Faubel, 1983 -- valid
  Eucestoplana cuneata (Sopott-Ehlers and Schmidt, 1975) -- valid
  Eucestoplana meridionalis (Prudhoe, 1982) -- valid
  Eudendrocoelum Komarek, 1925 -- invalid
  Eudendrocoelum beauchampi (Del Papa, 1952) -- invalid
  Eudendrocoelum bohemicum (Komarek and Kunst, 1956) -- invalid
  Eudendrocoelum botosaneanui (Del Papa, 1970) -- invalid
  Eudendrocoelum gineti (de Beauchamp, 1954) -- invalid
  Eudendrocoelum hussoni (Sauber, 1970) -- invalid
  Eudendrocoelum infernale (Steinmann, 1907) -- invalid
  Eudendrocoelum jablanicense (Stankovic and Komarek, 1927) -- invalid
  Eudendrocoelum lacteum (O. F. Müller, 1773) -- invalid
  Eudendrocoelum nausicaae (Schmidt, 1861) -- invalid
  Eudendrocoelum parvioculatum (de Beauchamp, 1932) -- invalid
  Eudendrocoelum remyi (de Beauchamp, 1926) -- invalid
  Eudendrocoelum sollaudi (de Beauchamp, 1931) -- invalid
  Eudendrocoelum subterraneum (Komarek, 1919) -- invalid
  Eudendrocoelum tubuliferum (de Beauchamp, 1919) -- invalid
  Eudoxiatopoplana Winsor, 2009 -- valid
  Eudoxiatopoplana bilaticlavia Winsor, 2009 -- valid
  Eudoxiatopoplaninae Winsor, 2009 -- valid
  Euilyoida Faubel, 1983 -- valid
  Euilyoida malagasensis (Doignon, Artois and Deheyn, 2003) -- valid
  Euilyoida takewakii (Kato, 1935) -- valid
  Eukalyptorhynchia Meixner, 1928 -- invalid
  Eulatocestus Faubel, 1983 -- valid
  Eulatocestus caribbeanus (Prudhoe, 1944) -- valid
  Eulatocestus galapagensis (Hyman, 1953) -- valid
  Eulatocestus pacificus (Laidlaw, 1903) -- valid
  Eulecithophora de Beauchamp, 1961 -- invalid
  Eumecynostomum Faubel and Regier, 1983 -- valid
  Eumecynostomum altitudi Faubel and Regier, 1983 -- valid
  Eumecynostomum asterium Hooge and Tyler, 2003 -- valid
  Eumecynostomum bathycolum (Westblad, 1948) -- valid
  Eumecynostomum boreale (Faubel, 1977) -- valid
  Eumecynostomum evelinae (Marcus, 1948) -- valid
  Eumecynostomum flavescens (Dörjes, 1968) -- valid
  Eumecynostomum fragilis (Dörjes, 1968) -- valid
  Eumecynostomum juistensis (Dörjes, 1968) -- valid
  Eumecynostomum luridum Kozloff, 2000 -- valid
  Eumecynostomum macrobursalium (Westblad, 1946) -- valid
  Eumecynostomum maritimum (Dörjes, 1968) -- valid
  Eumecynostomum pallidum (Beklemischev, 1915) -- valid
  Eumecynostomum papillosum (Faubel, 1974) -- valid
  Eumecynostomum sanguineum (Beklemischev, 1915) -- invalid
  Eumecynostomum tardum (Ehlers and Dörjes, 1979) -- valid
  Eumecynostomum westbladi (Dörjes, 1968) -- valid
  Euplana Girard, 1893 -- valid
  Euplana carolinensis Hyman, 1940 -- valid
  Euplana clippertoni Hyman, 1939 -- invalid
  Euplana concolor (Meixner, 1907) -- invalid
  Euplana gigas (Schmarda, 1859) -- invalid
  Euplana gracilis (Girard, 1850) -- valid
  Euplana hymanae Marcus, 1947 -- valid
  Euplana inquieta (Heath and McGregor, 1912) -- invalid
  Euplana longipenis (Kato, 1943) -- invalid
  Euplana malayana (Laidlaw, 1903) -- invalid
  Euplana pacificola (Plehn, 1896) -- invalid
  Euplana subviridus (Plehn, 1896) -- invalid
  Euplana takewakii (Kato, 1935) -- invalid
  Euplana tropicalis Hyman, 1954 -- invalid
  Euplanaria Hesse, 1897 -- invalid
  Euplanaria absoloni (Komarek, 1919) -- invalid
  Euplanaria agilis (Stringer, 1909) -- invalid
  Euplanaria anceps Kenk, 1930 -- invalid
  Euplanaria andamanensis (Kaburaki, 1925) -- invalid
  Euplanaria andina (Borelli, 1895) -- invalid
  Euplanaria aurita (Kennel, 1888) -- invalid
  Euplanaria bohmigi (Weiss, 1909) -- invalid
  Euplanaria burmaensis (Kaburaki, 1918) -- invalid
  Euplanaria cameliae (Fuhrmann, 1914) -- invalid
  Euplanaria cretica Meixner, 1928 -- invalid
  Euplanaria dimorpha (Böhmig, 1902) -- invalid
  Euplanaria dorotocephala (Woodworth, 1897) -- invalid
  Euplanaria etrusca (Benazzi, 1944) -- invalid
  Euplanaria festae (Borelli, 1898) -- invalid
  Euplanaria glandulosa Kenk, 1930 -- invalid
  Euplanaria gonocephala (A. L. Dugès, 1830) -- invalid
  Euplanaria gonocephala cretica Meixner, 1928 -- invalid
  Euplanaria gracilis (Haldeman, 1840) -- invalid
  Euplanaria graffi (Weiss, 1909) -- invalid
  Euplanaria hoernesi (Weiss, 1909) -- invalid
  Euplanaria iheringi (Böhmig, 1887) -- invalid
  Euplanaria iranica Livanov, 1951 -- invalid
  Euplanaria jeanneli (de Beauchamp, 1913) -- invalid
  Euplanaria lata (Sivickis, 1923) -- invalid
  Euplanaria longistriata (Fuhrmann, 1914) -- invalid
  Euplanaria lugubris (Schmidt, 1861) -- invalid
  Euplanaria maculata (Leidy, 1847) -- invalid
  Euplanaria mertoni (Steinmann, 1914) -- invalid
  Euplanaria microbursalis Hyman, 1931 -- invalid
  Euplanaria neumanni (Neppi, 1904) -- invalid
  Euplanaria novangliae Hyman, 1931 -- invalid
  Euplanaria paramensis (Fuhrmann, 1914) -- invalid
  Euplanaria philadelphica Hyman, 1931 -- invalid
  Euplanaria polychroa (Schmidt, 1861) -- invalid
  Euplanaria porva (O. F. Müller, 1774) -- invalid
  Euplanaria reclusa de Beauchamp, 1940 -- invalid
  Euplanaria schauinslandi (Neppi, 1904) -- invalid
  Euplanaria seclusa de Beauchamp, 1940 -- invalid
  Euplanaria subtentaculata (Draparnaud, 1803) -- invalid
  Euplanaria taurocaucasica Livanov, 1951 -- invalid
  Euplanaria tigrina (Girard, 1850) -- invalid
  Euplanaria tigrina novangliae Hyman, 1931 -- invalid
  Euplanaria torva (O. F. Müller, 1774) -- invalid
  Euplanaria transcaucasica Livanov, 1951 -- invalid
  Euplanaria wytegrensis (Sabussow, 1907) -- invalid
  Euplanidae Marcus and Marcus, 1966 -- valid
  Euplanina Sopott-Ehlers and Schmidt, 1975 -- valid
  Euplanina horrida Sopott-Ehlers and Schmidt, 1975 -- valid
  Euplanoida Faubel, 1983 -- valid
  Euplanoida concolor (Meixner, 1907) -- valid
  Euplanoida elioti (Laidlaw, 1903) -- valid
  Euplanoida malayana (Laidlaw, 1903) -- valid
  Euplanoida pacificola (Plehn, 1896) -- valid
  Euplanoida pardalis (Laidlaw, 1902) -- invalid
  Euplanoida penangensis (Laidlaw, 1903) -- valid
  Euplanoida tropicalis (Hyman, 1954) -- valid
  Euporobothria Graff, 1909 -- invalid
  Euporobothria bohemica (Vejdovsky, 1895) -- invalid
  Euporobothria dorpatensis (Braun, 1881) -- invalid
  Euprosthiostomum Bock, 1925 -- valid
  Euprosthiostomum adhaerens Bock, 1925 -- valid
  Euprosthiostomum angustum (Bock, 1913) -- valid
  Euprosthiostomum auratum (Kato, 1937) -- valid
  Euprosthiostomum bellum (Kato, 1939) -- valid
  Euprosthiostomum exiguum (Hyman, 1959) -- valid
  Euprosthiostomum laetum (Kato, 1938) -- valid
  Euprosthiostomum matarazzoi (Marcus, 1950) -- valid
  Euprosthiostomum molle (Freeman, 1930) -- valid
  Euprosthiostomum mortenseni Marcus, 1948 -- valid
  Euprosthiostomum mortensenii Marcus, 1948 -- invalid
  Euprosthiostomum pakium Marcus and Marcus, 1968 -- valid
  Euprosthiostomum pulchrum (Bock, 1913) -- valid
  Euprosthiostomum viscosum Palombi, 1936 -- valid
  Eurylepta Ehrenberg, 1831 -- valid
  Eurylepta affinis Collingwood, 1876 -- invalid
  Eurylepta alba (Freeman, 1933) -- invalid
  Eurylepta argus (Quatrefage, 1845) -- invalid
  Eurylepta atraviridis Collingwood, 1876 -- invalid
  Eurylepta aurantiaca Heath and McGregor, 1912 -- valid
  Eurylepta auriculata Hallez, 1878 -- invalid
  Eurylepta aurita Claparède, 1861 -- invalid
  Eurylepta baeckstroemi (Bock, 1923) -- valid
  Eurylepta californica Hyman, 1959 -- valid
  Eurylepta cardiosora Schmarda, 1859 -- invalid
  Eurylepta cerebralis (Kelaart, 1858) -- invalid
  Eurylepta coccinea Stimpson, 1857 -- invalid
  Eurylepta cornuta (O. F. Müller, 1776) -- valid
  Eurylepta cornuta cornuta (O. F. Müller, 1776) -- valid
  Eurylepta cornuta lobianchi (Lang, 1879) -- valid
  Eurylepta cornuta melobesiarum (Schmidtlein, 1880) -- valid
  Eurylepta cornuta wandeli Hallez, 1907 -- invalid
  Eurylepta cristata (Quatrefage, 1845) -- invalid
  Eurylepta dalyelli Johnston, 1865 -- invalid
  Eurylepta dalyellii Johnston, 1865 -- invalid
  Eurylepta dulcis (Kelaart, 1858) -- invalid
  Eurylepta flavomarginata Ehrenberg, 1831 -- invalid
  Eurylepta fulminata Stimpson, 1855 -- invalid
  Eurylepta fulvolimbata Grube, 1867 -- valid
  Eurylepta fusca (Kelaart, 1858) -- invalid
  Eurylepta guttatomarginata Stimpson, 1855 -- invalid
  Eurylepta herberti Kirk, 1882 -- valid
  Eurylepta interrupta Stimpson, 1855 -- invalid
  Eurylepta japonica Stimpson, 1857 -- invalid
  Eurylepta kelaarti Collingwood, 1876 -- invalid
  Eurylepta kelaartii Collingwood, 1876 -- invalid
  Eurylepta leoparda Freeman, 1933 -- valid
  Eurylepta limbata (Leuckart, 1828) -- invalid
  Eurylepta lobianchii (Lang, 1879) -- invalid
  Eurylepta maculata (Pease, 1860) -- invalid
  Eurylepta maculosa Verrill, 1892 -- invalid
  Eurylepta meridiana (Ritter-Zahony, 1907) -- valid
  Eurylepta miniata Schmarda, 1859 -- invalid
  Eurylepta multicelis (Hyman, 1955) -- valid
  Eurylepta neptis Du Bois-Reymond Marcus, 1955 -- valid
  Eurylepta nigra Stimpson, 1857 -- invalid
  Eurylepta nigrocincta Schmarda, 1859 -- invalid
  Eurylepta oceanica (Darwin, 1844) -- invalid
  Eurylepta orbicularis Schmarda, 1859 -- invalid
  Eurylepta pantherina Grube, 1867 -- valid
  Eurylepta piscatoria (Marcus, 1947) -- valid
  Eurylepta praetexta Ehrenberg, 1831 -- invalid
  Eurylepta pulchra Ĝrsted, 1845 -- invalid
  Eurylepta punctata Kaburaki, 1923 -- invalid
  Eurylepta purpurea (Kelaart, 1858) -- invalid
  Eurylepta rubrocincta Schmarda, 1859 -- invalid
  Eurylepta rugosa (Hyman, 1959) -- valid
  Eurylepta sanguinolenta (Quatrefage, 1845) -- invalid
  Eurylepta striata Schmarda, 1859 -- invalid
  Eurylepta striata (Kelaart, 1858) -- invalid
  Eurylepta superba Schmarda, 1859 -- invalid
  Eurylepta susakiensis (Kato, 1934) -- invalid
  Eurylepta turma Marcus, 1952 -- valid
  Eurylepta undulata (Kelaart, 1858) -- invalid
  Eurylepta velutina (Blanchard, 1847) -- invalid
  Eurylepta violacea (Kelaart, 1858) -- valid
  Eurylepta violacea Schmarda, 1859 -- invalid
  Eurylepta viridis (Kelaart, 1858) -- invalid
  Eurylepta vittata (Montagu, 1815) -- invalid
  Eurylepta zebra (Leuckart, 1828) -- invalid
  Eurylepta zeylanica (Kelaart, 1858) -- invalid
  Euryleptidae Stimpson, 1857 -- valid
  Euryleptides Palombi, 1923 -- valid
  Euryleptides brasiliensis Palombi, 1923 -- valid
  Euryleptididae Faubel, 1984 -- valid
  Euryleptinae Stimpson, 1857 -- invalid
  Euryleptodes Heath and McGregor, 1912 -- valid
  Euryleptodes cavicola Heath and McGregor, 1912 -- valid
  Euryleptodes galikias Noreña, Marquina, Perez and Almon, 2014 -- valid
  Euryleptodes insularis Hyman, 1953 -- valid
  Euryleptodes pannulus Heath and McGregor, 1912 -- valid
  Euryleptodes phyllulus Heath and McGregor, 1912 -- valid
  Euryleptoidea Stimpson, 1857 -- valid
  Eustylochus Verrill, 1892 -- invalid
  Eustylochus ellipticus (Girard, 1850) -- invalid
  Eustylochus meridionalis Pearse, 1938 -- invalid
  Eutheama Faubel, 1983 -- invalid
  Eutheama forrestensis Bulnes and Faubel, 2003 -- invalid
  Eutheama occidua (Sopott-Ehlers and Schmidt, 1975) -- invalid
  Euxinia Graff, 1911 -- valid
  Euxinia baltica Meixner, 1938 -- valid
  Euxinia corniculata Graff, 1911 -- valid
  Eviella Ball, 1977 -- valid
  Eviella hynesae Ball, 1977 -- valid
  Exocelis Ehlers and Dörjes, 1979 -- valid
  Exocelis exopenis Ehlers and Dörjes, 1979 -- valid
  Exocelis reedi Hooge and Tyler, 2008 -- valid
  Ezona Tajika, 1980 -- valid
  Ezona habomaiensis Tajika, 1980 -- valid
  Ezona pinnigera Tajika, 1980 -- valid
  Ezoplana Tajika, 1982 -- valid
  Ezoplana masacoae Tajika, 1982 -- valid
  Ezoplana oxygona Tajika, 1982 -- valid
  Faerlea Westblad, 1945 -- valid
  Faerlea antora Marcus, 1952 -- valid
  Faerlea echinocardii Dörjes, 1972 -- valid
  Faerlea fragilis Westblad, 1945 -- valid
  Faerlea glomerata Westblad, 1945 -- valid
  Falkla Karling, 1952 -- valid
  Falkla bacillata Karling, 1952 -- valid
  Fallacohospes Kozloff, 1965 -- valid
  Fallacohospes inchoatus Kozloff, 1965 -- valid
  Fasciola Linnaeus, 1758 -- valid
  Fasciola alpina (Dana, 1766) -- invalid
  Fasciola angulata O. F. Müller, 1774 -- valid
  Fasciola brunnea O. F. Müller, 1773 -- invalid
  Fasciola candida O. F. Müller, 1774 -- valid
  Fasciola capitata O. F. Müller, 1774 -- valid
  Fasciola caudata O. F. Müller, 1774 -- valid
  Fasciola ciliata O. F. Müller, 1774 -- valid
  Fasciola composita Schrank, 1776 -- invalid
  Fasciola crenata O. F. Müller, 1773 -- invalid
  Fasciola flaccida O. F. Müller, 1774 -- valid
  Fasciola fusca Pallas, 1774 -- invalid
  Fasciola glauca O. F. Müller, 1774 -- valid
  Fasciola grossum O. F. Müller, 1774 -- invalid
  Fasciola gulo O. F. Müller, 1774 -- valid
  Fasciola helluo O. F. Müller, 1773 -- invalid
  Fasciola lactea O. F. Müller, 1773 -- invalid
  Fasciola lagena Gmelin, 1791 -- valid
  Fasciola linearis O. F. Müller, 1773 -- invalid
  Fasciola lineata O. F. Müller, 1773 -- invalid
  Fasciola marmorosa O. F. Müller, 1774 -- invalid
  Fasciola minima Schrank, 1776 -- valid
  Fasciola nigra O. F. Müller, 1773 -- invalid
  Fasciola obscura O. F. Müller, 1774 -- invalid
  Fasciola punctata O. F. Müller, 1773 -- valid
  Fasciola punctata Pallas, 1774 -- invalid
  Fasciola quandrangularis Pallas, 1774 -- valid
  Fasciola radiata O. F. Müller, 1773 -- invalid
  Fasciola rosea O. F. Müller, 1773 -- invalid
  Fasciola rostrata O. F. Müller, 1774 -- invalid
  Fasciola rubra O. F. Müller, 1774 -- valid
  Fasciola stagnalis O. F. Müller, 1774 -- valid
  Fasciola strigata O. F. Müller, 1773 -- valid
  Fasciola tentaculata O. F. Müller, 1774 -- invalid
  Fasciola terrestris O. F. Müller, 1773 -- invalid
  Fasciola tetragona O. F. Müller, 1774 -- invalid
  Fasciola torva O. F. Müller, 1774 -- invalid
  Fasciola tremellaris O. F. Müller, 1773 -- invalid
  Fasciola ventricosa Pallas, 1774 -- valid
  Fasciola viridis O. F. Müller, 1774 -- valid
  Feanora De Clerck and Schockaert, 1995 -- valid
  Feanora brevicirrus De Clerck and Schockaert, 1995 -- valid
  Fecampia Giard, 1886 -- valid
  Fecampia abyssicola Christensen, 1981 -- valid
  Fecampia balanicola Christensen and Hurley, 1977 -- valid
  Fecampia erythrocephala Giard, 1886 -- valid
  Fecampia spiralis Baylis, 1949 -- invalid
  Fecampia xanthocephala Caullery and Mesnil, 1902 -- valid
  Fecampiida Rohde, Luton and Johnson, 1994 -- invalid
  Fecampiidae Graff, 1903 -- valid
  Flagellophora Faubel and Dörjes, 1978 -- valid
  Flagellophora apelti Faubel and Dörjes, 1978 -- valid
  Fletchamia Winsor, 1991 -- valid
  Fletchamia dakini (Dendy, 1915) -- valid
  Fletchamia flavilineata (Dendy, 1915) -- valid
  Fletchamia fuscodorsalis (Steel, 1901) -- valid
  Fletchamia mediolineata (Dendy, 1891) -- valid
  Fletchamia mediolineata mediolineata (Dendy, 1891) -- valid
  Fletchamia mediolineata simularis (Steel, 1901) -- valid
  Fletchamia mmahoni (Dendy, 1891) -- valid
  Fletchamia quinquelineata (Fletcher and Hamilton, 1888) -- valid
  Fletchamia quinquelineata accentuata (Steel, 1897) -- valid
  Fletchamia quinquelineata quinquelineata (Fletcher and Hamilton, 1888) -- valid
  Fletchamia sugdeni (Dendy, 1891) -- valid
  Florianella Rieger and Sterrer, 1975 -- valid
  Florianella bipolaris Rieger and Sterrer, 1975 -- valid
  Fondicola Buchanan, 1936 -- invalid
  Fonticola Komarek, 1926 -- invalid
  Fonticola albissima (Vejdovsky, 1883) -- invalid
  Fonticola albissima catalaunica de Beauchamp, 1932 -- invalid
  Fonticola albissima dalmatica Stankovic and Komarek, 1927 -- invalid
  Fonticola albissima illyrica (Komarek, 1919) -- invalid
  Fonticola albissima macedonica (Stankovic, 1926) -- invalid
  Fonticola altaica Livanov and Zabusova, 1940 -- invalid
  Fonticola armeniaca (Komarek, 1916) -- invalid
  Fonticola bosniaca (Stankovic, 1926) -- invalid
  Fonticola bursaperforata (Darlington, 1959) -- invalid
  Fonticola cavernicola (Hyman, 1954) -- invalid
  Fonticola dalmatica Stankovic and Komarek, 1927 -- invalid
  Fonticola gracilis (Haldeman, 1840) -- invalid
  Fonticola gracilis monopharyngea (Hyman, 1945) -- invalid
  Fonticola gracilis woodworthi (Hyman, 1937) -- invalid
  Fonticola illyrica (Komarek, 1919) -- invalid
  Fonticola leptophallus Reisinger, 1963 -- invalid
  Fonticola macedonica (Stankovic, 1926) -- invalid
  Fonticola maculata (Stankovic, 1938) -- invalid
  Fonticola morgani (Stevens and Boring, 1906) -- invalid
  Fonticola morgani morgani (Stevens and Boring, 1906) -- invalid
  Fonticola morgani polycelis Kenk, 1935 -- invalid
  Fonticola nivea (Kenk, 1953) -- invalid
  Fonticola nivea tahoena (Kawakatsu, 1968) -- invalid
  Fonticola notadena (de Beauchamp, 1937) -- invalid
  Fonticola ochridana Stankovic and Komarek, 1927 -- invalid
  Fonticola olivacea (Schmidt, 1861) -- invalid
  Fonticola opisthogona Kenk, 1936 -- invalid
  Fonticola oregonensis (Hyman, 1963) -- invalid
  Fonticola papillifera (Ijima and Kaburaki, 1916) -- invalid
  Fonticola paravitta (Reisinger, 1923) -- invalid
  Fonticola paravittoides Livanov and Zabusova, 1940 -- invalid
  Fonticola pellucida (Ijima and Kaburaki, 1916) -- invalid
  Fonticola percaeca (Packard, 1879) -- invalid
  Fonticola percoecum (Packard, 1879) -- invalid
  Fonticola prosorchis Kenk, 1937 -- invalid
  Fonticola racovitzai (de Beauchamp, 1928) -- invalid
  Fonticola sibirica (Sabussow, 1903) -- invalid
  Fonticola stankovici Reisinger, 1960 -- invalid
  Fonticola subterranea (Hyman, 1937) -- invalid
  Fonticola truncata (Leidy, 1851) -- invalid
  Fonticola undulata Stankovic, 1960 -- invalid
  Fonticola velata (Stringer, 1909) -- invalid
  Fonticola vernalis (Kenk, 1944) -- invalid
  Fonticola vitta (A. L. Dugès, 1830) -- invalid
  Fonticola vivida (Ijima and Kaburaki, 1916) -- invalid
  Fovia Girard, 1854 -- invalid
  Fovia affinis (Ĝrsted, 1843) -- invalid
  Fovia graciliceps Stimpson, 1857 -- invalid
  Fovia grisea Verrill, 1893 -- invalid
  Fovia lapidaria Mereschkowsky, 1878 -- invalid
  Fovia littoralis (O. F. Müller, 1776) -- invalid
  Fovia trilobata Stimpson, 1857 -- invalid
  Fovia warreni (Girard, 1850) -- invalid
  Foviella Bock, 1925 -- valid
  Foviella affinis (Ĝrsted, 1843) -- valid
  Freemania Hyman, 1953 -- invalid
  Freemania litoricola (Heath and McGregor, 1912) -- invalid
  Friedmaniella Timoshkin and Zabrovskaya, 1985 -- valid
  Friedmaniella alba Timoshkin, 1985 -- valid
  Friedmaniella minima Timoshkin and Zabrovskaya, 1985 -- invalid
  Friedmaniella rufula Timoshkin and Zabrovskaya, 1985 -- valid
  Fuhrmannia Graff, 1908 -- invalid
  Fuhrmannia turgida (Zacharias, 1902) -- invalid
  Fulinskiella Gieysztor and Szynal, 1939 -- valid
  Fulinskiella bardeaui (Steinböck, 1926) -- valid
  Fulinskiella lapponica Luther, 1955 -- valid
  Fulinskiella sphyrocephala (Steinböck, 1931) -- invalid
  Fungorhynchus Karling, 1952 -- valid
  Fungorhynchus pistillatus Karling, 1952 -- valid
  Fusantrum Crezee, 1975 -- valid
  Fusantrum rhammiphorum Crezee, 1975 -- valid
  Fyfea Winsor, 2006 -- valid
  Fyfea carnleyi (Fyfe, 1953) -- valid
  Galapagetula Reygel, Artois and Willems, 2011 -- valid
  Galapagetula annikae Reygel, Willems and Artois, 2011 -- valid
  Galapagoplana Ax and Ax, 1974 -- valid
  Galapagoplana bituba Ax and Ax, 1974 -- valid
  Galapagorhynchus Artois and Schockaert, 1999 -- valid
  Galapagorhynchus hoxholdi Artois and Schockaert, 1999 -- valid
  Galeocephala Stimpson, 1857 -- invalid
  Galeocephala superba (Girard, 1850) -- invalid
  Galeocephala tentaculata (O. F. Müller, 1774) -- invalid
  Gallorhynchus Schockaert and Brunet, 1971 -- valid
  Gallorhynchus mediterraneus Schockaert and Brunet, 1971 -- valid
  Gallorhynchus simplex Schockaert and Brunet, 1971 -- valid
  Gandalfia Willems, Artois, Vermin, Backeljau and Schockaert, 2005 -- valid
  Gandalfia bilunata Willems, Artois, Vermin, Backeljau and Schockaert, 2005 -- valid
  Gasterotrichula Bargoni, 1896 -- invalid
  Gasterotrichula ficalbii Bargoni, 1896 -- invalid
  Gastropharyngidae Meixner, 1938 -- invalid
  Gastropharynx Meixner, 1938 -- invalid
  Gastropharynx contractilis Meixner, 1938 -- invalid
  Gastropharynx limophilus Riedl, 1956 -- invalid
  Gaziella De Clerck and Schockaert, 1995 -- valid
  Gaziella lacertosa De Clerck and Schockaert, 1995 -- valid
  Gaziella pileola De Clerck and Schockaert, 1995 -- valid
  Gelasinella Sewell and Cannon, 1998 -- valid
  Gelasinella porfirievae Sewell and Cannon, 1998 -- valid
  Gelasinella powellorum Sewell and Cannon, 1998 -- valid
  Gemelliclininae Evdonin, 1977 -- valid
  Gemelliclinus Evdonin, 1970 -- valid
  Gemelliclinus flavidus Evdonin, 1970 -- valid
  Genostoma Dörler, 1900 -- valid
  Genostoma inopinatum Hyra, 1993 -- valid
  Genostoma kozloffi Hyra, 1993 -- valid
  Genostoma marsiliensis (Calandruccio, 1897) -- valid
  Genostoma tergestina (Calandruccio, 1897) -- valid
  Genostomatidae Graff, 1903 -- valid
  Geobenazzia Minelli, 1974 -- valid
  Geobenazzia tyrrhenica Minelli, 1974 -- valid
  Geobia Diesing, 1862 -- valid
  Geobia subterranea (Schultze and F. Müller, 1857) -- valid
  Geocentrophora de Man, 1876 -- valid
  Geocentrophora applanata (Kennel, 1888) -- valid
  Geocentrophora baltica (Kennel, 1883) -- valid
  Geocentrophora boui de Beauchamp and Gourbault, 1967 -- valid
  Geocentrophora cavernicola Carpenter, 1970 -- valid
  Geocentrophora coeca Marcus, 1944 -- invalid
  Geocentrophora gigas Timoshkin, 1984 -- valid
  Geocentrophora hygrophilus (Vejdovsky, 1895) -- invalid
  Geocentrophora incognita Timoshkin and Zabrovskaya, 1984 -- valid
  Geocentrophora intersticialis Timoshkin, 1984 -- valid
  Geocentrophora leuckarti (Zacharias, 1886) -- invalid
  Geocentrophora levanidorum Timoshkin, 1984 -- valid
  Geocentrophora marcusi Darlington, 1959 -- valid
  Geocentrophora metameroides (de Beauchamp, 1913) -- valid
  Geocentrophora olgae Timoshkin, 1991 -- valid
  Geocentrophora porfirievae Timoshkin and Zabrovskaya, 1984 -- valid
  Geocentrophora sphaerocephala de Man, 1876 -- invalid
  Geocentrophora sphyrocephala de Man, 1876 -- valid
  Geocentrophora tropica Hyman, 1941 -- valid
  Geocentrophora wagini Timoshkin, 1984 -- valid
  Geocentrophora wagini abyssalis Timoshkin, 2004 -- valid
  Geocentrophora wagini wagini Timoshkin, 1984 -- valid
  Geocentrophora wasiliewi Timoshkin, 1991 -- valid
  Geodesmus Metschnikoff, 1865 -- invalid
  Geodesmus atrocyaneus Walton, 1912 -- invalid
  Geodesmus bilineatus Metschnikoff, 1865 -- invalid
  Geodesmus cockerelli (Graff, 1899) -- invalid
  Geodesmus maculatus (Fuhrmann, 1914) -- invalid
  Geodesmus montoyae (Fuhrmann, 1912) -- invalid
  Geodesmus terrestris (O. F. Müller, 1773) -- invalid
  Geodesmus voeltzkowi (Graff, 1899) -- invalid
  Geopaludicola Komarek, 1919 -- invalid
  Geopaludicola absoloni Komarek, 1919 -- invalid
  Geoplana Stimpson, 1857 -- valid
  Geoplana (Geoplana) Stimpson, 1857 -- valid
  Geoplana abundans (Graff, 1899) -- invalid
  Geoplana adae Dendy, 1891 -- invalid
  Geoplana adae extralineata Dendy, 1892 -- invalid
  Geoplana adae fusca Dendy, 1894 -- invalid
  Geoplana agricola Dendy, 1895 -- invalid
  Geoplana agricola maori Dendy, 1901 -- invalid
  Geoplana alba Dendy, 1891 -- invalid
  Geoplana alba roseolineata Dendy, 1892 -- invalid
  Geoplana albolineata Steel, 1897 -- invalid
  Geoplana albonigra Riester, 1938 -- invalid
  Geoplana albopunctata Graff, 1899 -- invalid
  Geoplana alfordensis Dendy, 1896 -- invalid
  Geoplana alterfusca Hyman, 1962 -- valid
  Geoplana amagensis Fuhrmann, 1912 -- invalid
  Geoplana andicola (Schmarda, 1859) -- invalid
  Geoplana andina Hyman, 1962 -- invalid
  Geoplana antarctica Dendy, 1909 -- invalid
  Geoplana apeva C. G. Froehlich, 1959 -- invalid
  Geoplana aphalla Hyman, 1941 -- invalid
  Geoplana applanata Graff, 1899 -- invalid
  Geoplana arenicola Steel, 1901 -- invalid
  Geoplana argus Graff, 1899 -- invalid
  Geoplana arkalabamensis Ogren and Darlington, 1991 -- valid
  Geoplana arpi Schirch, 1929 -- invalid
  Geoplana ashleyi Fyfe, 1953 -- invalid
  Geoplana assimilis Graff, 1899 -- invalid
  Geoplana assu C. G. Froehlich, 1959 -- invalid
  Geoplana astraea Marcus, 1951 -- invalid
  Geoplana atra Schultze and F. Müller, 1857 -- invalid
  Geoplana atrata Steel, 1897 -- invalid
  Geoplana atropurpurea Riester, 1938 -- invalid
  Geoplana aucklandica Dendy, 1901 -- invalid
  Geoplana austiniana Schröder, 1924 -- invalid
  Geoplana aymara Du Bois-Reymond Marcus, 1951 -- valid
  Geoplana balfouri Graff, 1899 -- invalid
  Geoplana baptistae Leal-Zanchet and Oliveira, 2012 -- invalid
  Geoplana barreirana Riester, 1938 -- invalid
  Geoplana barringtonensis Wood, 1926 -- invalid
  Geoplana beckeri C. G. Froehlich, 1959 -- valid
  Geoplana becki Fuhrmann, 1912 -- invalid
  Geoplana bergi Graff, 1899 -- invalid
  Geoplana bicolor Graff, 1899 -- invalid
  Geoplana bilinearis (Darwin, 1844) -- invalid
  Geoplana bilineata Fuhrmann, 1914 -- invalid
  Geoplana bimaculata Kaburaki, 1922 -- invalid
  Geoplana bimbergi Fuhrmann, 1914 -- valid
  Geoplana biseminalis Riester, 1938 -- invalid
  Geoplana bistriata Hyman, 1962 -- invalid
  Geoplana blanchardi Graff, 1899 -- invalid
  Geoplana blaseri Schirch, 1929 -- invalid
  Geoplana bogotensis Graff, 1899 -- invalid
  Geoplana bogotensis buergeri Busson, 1903 -- invalid
  Geoplana bohlsi Graff, 1899 -- invalid
  Geoplana bonita Schirch, 1929 -- invalid
  Geoplana brasiliensis (Blainville, 1826) -- invalid
  Geoplana braunsi Graff, 1899 -- invalid
  Geoplana bresslaui Schirch, 1929 -- invalid
  Geoplana brittlebanki Graff, 1897 -- invalid
  Geoplana burmeisteri Schultze and F. Müller, 1857 -- invalid
  Geoplana burri Riester, 1938 -- invalid
  Geoplana büttneri Graff, 1893 -- invalid
  Geoplana caapora C. G. Froehlich, 1957 -- invalid
  Geoplana caeruleonigra Riester, 1938 -- invalid
  Geoplana caissara E. M. Froehlich, 1955 -- invalid
  Geoplana caleta E. M. Froehlich, 1978 -- valid
  Geoplana cameliae Fuhrmann, 1912 -- invalid
  Geoplana canaliculata Graff, 1899 -- invalid
  Geoplana cantuta Du Bois-Reymond Marcus, 1951 -- valid
  Geoplana carbayoi Oliveira and Leal-Zanchet, 2012 -- invalid
  Geoplana cardosi Schirch, 1929 -- invalid
  Geoplana carinata Riester, 1938 -- invalid
  Geoplana carrierei Graff, 1897 -- invalid
  Geoplana cassula E. M. Froehlich, 1955 -- invalid
  Geoplana catharina Hyman, 1957 -- invalid
  Geoplana caucaensis Fuhrmann, 1914 -- valid
  Geoplana caya Du Bois-Reymond Marcus, 1951 -- valid
  Geoplana challengeri Graff, 1899 -- invalid
  Geoplana chalona Du Bois-Reymond Marcus, 1951 -- valid
  Geoplana chamissoniana Schröder, 1924 -- invalid
  Geoplana chanca E. M. Froehlich, 1978 -- valid
  Geoplana chilensis Graff, 1899 -- invalid
  Geoplana chilihua Du Bois-Reymond Marcus, 1958 -- valid
  Geoplana chimbeva E. M. Froehlich, 1955 -- invalid
  Geoplana chiriquii Hyman, 1962 -- invalid
  Geoplana chita C. G. Froehlich, 1956 -- valid
  Geoplana chiuna E. M. Froehlich, 1955 -- valid
  Geoplana chulpa Du Bois-Reymond Marcus, 1951 -- valid
  Geoplana circularis Fyfe, 1956 -- invalid
  Geoplana citrina Wood, 1926 -- invalid
  Geoplana coerulea (Moseley, 1877) -- invalid
  Geoplana collini Graff, 1899 -- invalid
  Geoplana columbiana Fuhrmann, 1914 -- invalid
  Geoplana comitatis Dendy, 1915 -- invalid
  Geoplana contamanensis Hyman, 1955 -- invalid
  Geoplana cookiana Schröder, 1924 -- invalid
  Geoplana cooperi Dendy, 1901 -- invalid
  Geoplana coxii (Fletcher and Hamilton, 1888) -- invalid
  Geoplana crawfordi de Beauchamp, 1939 -- valid
  Geoplana crioula E. M. Froehlich, 1955 -- invalid
  Geoplana cruciata Graff, 1899 -- invalid
  Geoplana cucullata Dendy, 1896 -- invalid
  Geoplana cyanea Fyfe, 1956 -- invalid
  Geoplana daemeli Graff, 1899 -- invalid
  Geoplana dakini Dendy, 1915 -- invalid
  Geoplana darwini Hallez, 1893 -- valid
  Geoplana dendyi Spencer, 1891 -- invalid
  Geoplana dictyonota Riester, 1938 -- invalid
  Geoplana diemenensis Dendy, 1894 -- invalid
  Geoplana dietrichiana Schröder, 1924 -- invalid
  Geoplana diminutiva Hyman, 1955 -- invalid
  Geoplana distincta Graff, 1899 -- invalid
  Geoplana divae Marcus, 1951 -- invalid
  Geoplana doederleini Schirch, 1929 -- invalid
  Geoplana dovei Steel, 1900 -- invalid
  Geoplana dubia Dendy, 1892 -- invalid
  Geoplana duca Marcus, 1951 -- valid
  Geoplana ehlersi Graff, 1899 -- invalid
  Geoplana elegans Schultze and F. Müller, 1857 -- valid
  Geoplana elegans Steel, 1897 -- invalid
  Geoplana elongata (Darwin, 1844) -- invalid
  Geoplana ercilla E. M. Froehlich, 1978 -- invalid
  Geoplana eschscholtziana Schröder, 1924 -- invalid
  Geoplana eudoxia Ogren and Kawakatsu, 1990 -- invalid
  Geoplana eudoximariae Ogren and Kawakatsu, 1990 -- invalid
  Geoplana eugeniae Graff, 1897 -- invalid
  Geoplana evelinae Marcus, 1951 -- invalid
  Geoplana excelentissima Negrete, Brusa and Damborenea, 2012 -- valid
  Geoplana exulans Dendy, 1901 -- invalid
  Geoplana fagicola Dendy, 1901 -- invalid
  Geoplana ferussaci Graff, 1897 -- invalid
  Geoplana ficki Amaral and Leal-Zanchet, 2012 -- invalid
  Geoplana fita C. G. Froehlich, 1959 -- invalid
  Geoplana flava Moseley, 1877 -- invalid
  Geoplana flavilineata Dendy, 1915 -- invalid
  Geoplana flavimarginata Dendy, 1896 -- invalid
  Geoplana fletcheri Dendy, 1891 -- invalid
  Geoplana fletcheri adelaidensis Dendy, 1892 -- invalid
  Geoplana fletcheri borealis Dendy, 1895 -- invalid
  Geoplana flynni Dendy, 1915 -- invalid
  Geoplana forsterorum Schröder, 1924 -- invalid
  Geoplana fragai C. G. Froehlich, 1955 -- valid
  Geoplana franciscana Leal-Zanchet and Carbayo, 2001 -- invalid
  Geoplana frosti Spencer, 1891 -- invalid
  Geoplana fryi Graff, 1899 -- invalid
  Geoplana fryi brunea Riester, 1938 -- invalid
  Geoplana fuhrmanni Hyman, 1962 -- valid
  Geoplana fusca Hyman, 1962 -- valid
  Geoplana fuscodorsalis Steel, 1901 -- invalid
  Geoplana gabriellae Du Bois-Reymond Marcus, 1951 -- valid
  Geoplana gamblei Graff, 1899 -- invalid
  Geoplana garua Du Bois-Reymond Marcus, 1951 -- invalid
  Geoplana garveyi Dendy, 1901 -- invalid
  Geoplana gaucha C. G. Froehlich, 1959 -- invalid
  Geoplana gayi (Schultze, 1836) -- valid
  Geoplana gelatinosa Dendy, 1895 -- invalid
  Geoplana gigantea Graff, 1899 -- invalid
  Geoplana glieschi C. G. Froehlich, 1959 -- invalid
  Geoplana goeldii Graff, 1899 -- invalid
  Geoplana goetschi Riester, 1938 -- invalid
  Geoplana goettei Schirch, 1929 -- invalid
  Geoplana gollmeri Graff, 1899 -- invalid
  Geoplana gonzalezi Fuhrmann, 1914 -- invalid
  Geoplana graffii Dendy, 1895 -- invalid
  Geoplana graffii angusta Dendy, 1901 -- invalid
  Geoplana graffii castanea Dendy, 1901 -- invalid
  Geoplana graffii clintonensis Dendy, 1901 -- invalid
  Geoplana graffii dorsomarmorata Dendy, 1901 -- invalid
  Geoplana graffii nigrescens Dendy, 1901 -- invalid
  Geoplana graffii nodosa Dendy, 1901 -- invalid
  Geoplana graffii occidentalis Dendy, 1896 -- invalid
  Geoplana graffii ocellata Dendy, 1901 -- invalid
  Geoplana graffii otiraensis Dendy, 1896 -- invalid
  Geoplana graffii somersii Dendy, 1896 -- invalid
  Geoplana graffii wharekauriensis Dendy, 1901 -- invalid
  Geoplana graminicola Steel, 1901 -- invalid
  Geoplana gregoryana Schröder, 1924 -- invalid
  Geoplana guacensis Fuhrmann, 1914 -- valid
  Geoplana halbani Graff, 1899 -- invalid
  Geoplana hamiltoni Dendy, 1895 -- invalid
  Geoplana hauseri C. G. Froehlich, 1959 -- invalid
  Geoplana hillii Steel, 1897 -- invalid
  Geoplana hina Marcus, 1951 -- valid
  Geoplana hoggii Dendy, 1891 -- invalid
  Geoplana howesi Dendy, 1901 -- invalid
  Geoplana howitti Dendy, 1891 -- invalid
  Geoplana howitti obsoleta Dendy, 1892 -- invalid
  Geoplana huttoni Graff, 1899 -- invalid
  Geoplana idaia Du Bois-Reymond Marcus, 1951 -- invalid
  Geoplana inaequabilis Fyfe, 1956 -- invalid
  Geoplana inaequalistriata Dendy, 1895 -- invalid
  Geoplana incognita Riester, 1938 -- invalid
  Geoplana insularis Prudhoe, 1949 -- invalid
  Geoplana iris Dendy, 1896 -- invalid
  Geoplana irua Du Bois-Reymond Marcus, 1958 -- valid
  Geoplana itatiayana Schirch, 1929 -- invalid
  Geoplana jacksoniana Dendy, 1896 -- invalid
  Geoplana jandira C. G. Froehlich, 1955 -- valid
  Geoplana joia C. G. Froehlich, 1956 -- invalid
  Geoplana josefi Carbayo and Leal-Zanchet, 2001 -- invalid
  Geoplana kenneli Graff, 1899 -- invalid
  Geoplana korotneffi Graff, 1899 -- invalid
  Geoplana krausi Graff, 1899 -- invalid
  Geoplana ladislavii Graff, 1899 -- invalid
  Geoplana laingii Dendy, 1895 -- invalid
  Geoplana lama Du Bois-Reymond Marcus, 1957 -- valid
  Geoplana lambaya Du Bois-Reymond Marcus, 1958 -- valid
  Geoplana langi Graff, 1894 -- invalid
  Geoplana lapidicola Stimpson, 1857 -- invalid
  Geoplana lareta Du Bois-Reymond Marcus, 1958 -- valid
  Geoplana lata Graff, 1899 -- invalid
  Geoplana lateropunctata Dendy, 1901 -- invalid
  Geoplana latissima Dendy, 1896 -- invalid
  Geoplana leichhardtiana Schröder, 1924 -- invalid
  Geoplana leuckarti Graff, 1899 -- invalid
  Geoplana leucophryna Marcus, 1951 -- valid
  Geoplana libbieae Du Bois-Reymond Marcus, 1958 -- invalid
  Geoplana livia E. M. Froehlich, 1955 -- invalid
  Geoplana lucasi Dendy, 1891 -- invalid
  Geoplana lumbricoides Schirch, 1929 -- invalid
  Geoplana lyra Steel, 1900 -- invalid
  Geoplana maculata (Darwin, 1844) -- invalid
  Geoplana marginata Schultze and F. Müller, 1857 -- invalid
  Geoplana marginata Graff, 1899 -- invalid
  Geoplana mariae Dendy, 1895 -- invalid
  Geoplana marmorata Schultze and F. Müller, 1857 -- invalid
  Geoplana marrineri Dendy, 1910 -- valid
  Geoplana matuta E. M. Froehlich, 1955 -- invalid
  Geoplana maximiliani Schultze and F. Müller, 1857 -- invalid
  Geoplana mayori Fuhrmann, 1912 -- valid
  Geoplana mediolineata Dendy, 1891 -- invalid
  Geoplana meixneri Riester, 1938 -- invalid
  Geoplana melanochroa Steel, 1901 -- invalid
  Geoplana meridionalis Graff, 1899 -- invalid
  Geoplana metschnikoffi Graff, 1899 -- invalid
  Geoplana metzi Graff, 1899 -- invalid
  Geoplana mexicana Hyman, 1939 -- invalid
  Geoplana meyerhansi Fuhrmann, 1914 -- invalid
  Geoplana micholitzi Graff, 1899 -- invalid
  Geoplana minor Dendy, 1892 -- invalid
  Geoplana minuta Dendy, 1891 -- invalid
  Geoplana mirim E. M. Froehlich, 1972 -- valid
  Geoplana mixopulla Ogren and Kawakatsu, 1990 -- valid
  Geoplana mmahoni Dendy, 1891 -- invalid
  Geoplana modesta Graff, 1899 -- invalid
  Geoplana moebiusi Graff, 1899 -- invalid
  Geoplana montana Hyman, 1939 -- invalid
  Geoplana mortoni Dendy, 1894 -- invalid
  Geoplana moseleyi Hutton, 1880 -- invalid
  Geoplana mourei C. G. Froehlich, 1956 -- invalid
  Geoplana muelleri Diesing, 1861 -- invalid
  Geoplana muelleriana Schröder, 1924 -- invalid
  Geoplana multicolor Graff, 1899 -- invalid
  Geoplana multipunctata (Fuhrmann, 1914) -- valid
  Geoplana munda Fletcher and Hamilton, 1888 -- invalid
  Geoplana nana C. G. Froehlich, 1956 -- invalid
  Geoplana nasuta Loman, 1890 -- invalid
  Geoplana nataliae C. G. Froehlich, 1959 -- invalid
  Geoplana nephelis Schultze and F. Müller, 1857 -- invalid
  Geoplana nichollsi Dendy, 1915 -- invalid
  Geoplana nigra C. G. Froehlich, 1959 -- valid
  Geoplana nigrocephala Fuhrmann, 1914 -- invalid
  Geoplana nigrofusca (Darwin, 1844) -- invalid
  Geoplana nobilis Graff, 1899 -- invalid
  Geoplana notocelis Bresslau, 1930 -- invalid
  Geoplana notophthalma Riester, 1938 -- valid
  Geoplana obscura Schirch, 1929 -- invalid
  Geoplana octolineata Schirch, 1929 -- invalid
  Geoplana octolineata esverdeada Schirch, 1929 -- invalid
  Geoplana octostriata Schultze and F. Müller, 1857 -- invalid
  Geoplana oerstedi Graff, 1899 -- invalid
  Geoplana olivacea Schultze and F. Müller, 1857 -- invalid
  Geoplana oliverioi C. G. Froehlich, 1955 -- invalid
  Geoplana ornata Fletcher and Hamilton, 1888 -- invalid
  Geoplana ortizi Fuhrmann, 1912 -- invalid
  Geoplana pallida (Darwin, 1844) -- invalid
  Geoplana panamensis Hyman, 1941 -- invalid
  Geoplana parca E. M. Froehlich, 1955 -- invalid
  Geoplana pardalina Graff, 1899 -- invalid
  Geoplana parva Steel, 1897 -- invalid
  Geoplana pasipha Marcus, 1951 -- invalid
  Geoplana pavani Marcus, 1951 -- valid
  Geoplana pavonina Riester, 1938 -- invalid
  Geoplana pelewensis Graff, 1899 -- invalid
  Geoplana penhana Riester, 1938 -- invalid
  Geoplana perspicillata Graff, 1899 -- invalid
  Geoplana phocaica Marcus, 1951 -- invalid
  Geoplana picadoi de Beauchamp, 1912 -- invalid
  Geoplana pichuna Du Bois-Reymond Marcus, 1951 -- valid
  Geoplana picta C. G. Froehlich, 1956 -- valid
  Geoplana pinima E. M. Froehlich, 1955 -- invalid
  Geoplana piriana Almeida and Carbayo, 2012 -- invalid
  Geoplana placilla E. M. Froehlich, 1978 -- valid
  Geoplana plana Schirch, 1929 -- invalid
  Geoplana platei Graff, 1899 -- invalid
  Geoplana plumbea C. G. Froehlich, 1956 -- invalid
  Geoplana poca C. G. Froehlich, 1957 -- invalid
  Geoplana polyophthalma Graff, 1899 -- invalid
  Geoplana ponderosa Steel, 1897 -- invalid
  Geoplana preta Riester, 1938 -- invalid
  Geoplana pseudorhynchodemus Riester, 1938 -- invalid
  Geoplana pseudovaginuloides Riester, 1938 -- invalid
  Geoplana pulchella Schultze and F. Müller, 1857 -- invalid
  Geoplana pulla (Darwin, 1844) -- invalid
  Geoplana pulverulenta Graff, 1899 -- invalid
  Geoplana purpurea Dendy, 1895 -- invalid
  Geoplana quadrangulata Dendy, 1891 -- invalid
  Geoplana quadrangulata wellingtoni Dendy, 1892 -- invalid
  Geoplana quagga Marcus, 1951 -- valid
  Geoplana quenua Du Bois-Reymond Marcus, 1958 -- valid
  Geoplana quichua Du Bois-Reymond Marcus, 1951 -- valid
  Geoplana quinquelineata Fletcher and Hamilton, 1888 -- invalid
  Geoplana quinquelineata accentuata Steel, 1897 -- invalid
  Geoplana quinquestriata Hyman, 1962 -- invalid
  Geoplana ranuii Fyfe, 1953 -- invalid
  Geoplana regia E. M. Froehlich, 1955 -- valid
  Geoplana regina Dendy, 1892 -- invalid
  Geoplana reticulata Graff, 1899 -- invalid
  Geoplana rezendei Schirch, 1929 -- invalid
  Geoplana riedeli Schirch, 1929 -- invalid
  Geoplana riesteri C. G. Froehlich, 1955 -- invalid
  Geoplana righii E. M. Froehlich, 1972 -- invalid
  Geoplana robusta Steel, 1897 -- invalid
  Geoplana rosea E. M. Froehlich, 1955 -- invalid
  Geoplana rosenbergi Meixner, 1906 -- invalid
  Geoplana rostrata Graff, 1899 -- invalid
  Geoplana rouxiana Schröder, 1924 -- invalid
  Geoplana rubicunda Fletcher and Hamilton, 1888 -- invalid
  Geoplana rubidolineata Baptista and Leal-Zanchet, 2005 -- invalid
  Geoplana ruca (Marcus, 1954) -- invalid
  Geoplana rufiventris Graff, 1894 -- valid
  Geoplana rufiventris Schultze and F. Müller, 1857 -- invalid
  Geoplana ruiva E. M. Froehlich, 1972 -- invalid
  Geoplana sagittata Graff, 1899 -- invalid
  Geoplana saima Du Bois-Reymond Marcus, 1951 -- valid
  Geoplana sanguinea (Moseley, 1877) -- invalid
  Geoplana sanguinea alba Dendy, 1891 -- invalid
  Geoplana sarasiniana Schröder, 1924 -- invalid
  Geoplana scaphoidea Steel, 1901 -- invalid
  Geoplana schubarti C. G. Froehlich, 1957 -- invalid
  Geoplana schultzei Diesing, 1862 -- invalid
  Geoplana semilineata (Darwin, 1844) -- invalid
  Geoplana semoniana Schröder, 1924 -- invalid
  Geoplana septemlineata Hyman, 1939 -- invalid
  Geoplana sexlineata Riester, 1938 -- invalid
  Geoplana sexstriata Graff, 1899 -- invalid
  Geoplana shapra Du Bois-Reymond Marcus, 1957 -- valid
  Geoplana sieboldi Graff, 1899 -- invalid
  Geoplana simularis Steel, 1901 -- invalid
  Geoplana sondaica Loman, 1890 -- invalid
  Geoplana sowerbyi Graff, 1899 -- invalid
  Geoplana spectabilis Dendy, 1895 -- invalid
  Geoplana spenceri Dendy, 1889 -- invalid
  Geoplana splendens Dendy, 1895 -- invalid
  Geoplana splendida Graff, 1899 -- invalid
  Geoplana steenstrupi Krsmanovie, 1898 -- invalid
  Geoplana stolli Graff, 1899 -- invalid
  Geoplana subpallida Hyman, 1939 -- invalid
  Geoplana subquadrangulata Dendy, 1895 -- invalid
  Geoplana subquadrangulata enderbyensis Dendy, 1909 -- invalid
  Geoplana subterranea Schultze and F. Müller, 1857 -- invalid
  Geoplana subviridis Moseley, 1877 -- invalid
  Geoplana sugdeni Dendy, 1891 -- invalid
  Geoplana sulphureus Fletcher and Hamilton, 1888 -- invalid
  Geoplana suteri Dendy, 1896 -- invalid
  Geoplana suva C. G. Froehlich, 1959 -- invalid
  Geoplana sylvaticus (Leidy, 1851) -- invalid
  Geoplana taenioides Graff, 1899 -- invalid
  Geoplana takia Du Bois-Reymond Marcus, 1951 -- valid
  Geoplana talpa Du Bois-Reymond Marcus, 1951 -- valid
  Geoplana tamboensis Fuhrmann, 1914 -- valid
  Geoplana tamoia E. M. Froehlich, 1955 -- invalid
  Geoplana tapetilla Marcus, 1951 -- invalid
  Geoplana tapira C. G. Froehlich, 1957 -- invalid
  Geoplana tasmaniana (Darwin, 1844) -- invalid
  Geoplana tasmanica Stimpson, 1857 -- valid
  Geoplana taxiarcha Marcus, 1951 -- valid
  Geoplana tennenti Diesing, 1862 -- valid
  Geoplana tenuis Dendy, 1895 -- invalid
  Geoplana terrestris (O. F. Müller, 1773) -- invalid
  Geoplana testacea Hutton, 1880 -- invalid
  Geoplana theresopolitana Schirch, 1929 -- invalid
  Geoplana tingauna Kishimoto and Carbayo, 2012 -- invalid
  Geoplana tirua E. M. Froehlich, 1978 -- valid
  Geoplana toriba C. G. Froehlich, 1957 -- valid
  Geoplana traversii Moseley, 1877 -- invalid
  Geoplana triangulata Dendy, 1895 -- invalid
  Geoplana triangulata australis Dendy, 1895 -- invalid
  Geoplana tricolor Riester, 1938 -- invalid
  Geoplana trifasciata Steel, 1897 -- invalid
  Geoplana trigueira E. M. Froehlich, 1955 -- invalid
  Geoplana trina Marcus, 1951 -- invalid
  Geoplana tristriata Schultze and F. Müller, 1857 -- invalid
  Geoplana tuxaua E. M. Froehlich, 1955 -- invalid
  Geoplana typhlops Dendy, 1894 -- invalid
  Geoplana ubaquensis Fuhrmann, 1914 -- valid
  Geoplana ucayalensis Hyman, 1955 -- invalid
  Geoplana unicolor Hyman, 1955 -- invalid
  Geoplana vaga Hyman, 1943 -- invalid
  Geoplana vaginuloides (Darwin, 1844) -- valid
  Geoplana valdiviana Grau and Carbayo, 2011 -- valid
  Geoplana variegata Fletcher and Hamilton, 1888 -- invalid
  Geoplana velina C. G. Froehlich, 1959 -- invalid
  Geoplana velutina Riester, 1938 -- invalid
  Geoplana ventrolineata Dendy, 1892 -- invalid
  Geoplana ventropunctata Dendy, 1892 -- invalid
  Geoplana vicuna Du Bois-Reymond Marcus, 1957 -- valid
  Geoplana virgata Fletcher and Hamilton, 1888 -- invalid
  Geoplana viridis Fletcher and Hamilton, 1888 -- invalid
  Geoplana vongunteni Fuhrmann, 1912 -- invalid
  Geoplana walhallae Dendy, 1891 -- invalid
  Geoplana warragulensis Graff, 1899 -- invalid
  Geoplana wetzeli Schirch, 1929 -- invalid
  Geoplana weyrauchi Du Bois-Reymond Marcus, 1951 -- invalid
  Geoplana whartoni Gulliver, 1879 -- invalid
  Geoplana yara E. M. Froehlich, 1955 -- invalid
  Geoplana zebra Schröder, 1924 -- invalid
  Geoplana zebroides Riester, 1938 -- invalid
  Geoplanidae Stimpson, 1857 -- valid
  Geoplaninae Stimpson, 1857 -- valid
  Geoplanoidea Stimpson, 1857 -- valid
  Gerstfeldtia Sabussow, 1911 -- invalid
  Getula Karling, 1980 -- valid
  Getula uncinata (Karling, 1978) -- valid
  Gieysztoria Ruebush and Hayes, 1939 -- valid
  Gieysztoria (Marcusiella) Luther, 1955 -- valid
  Gieysztoria acariaia (Marcus, 1946) -- valid
  Gieysztoria ashokae Van Steenkiste, Van Mulken and Artois, 2012 -- valid
  Gieysztoria atalaya Brusa, Damborenea and Noreña, 2008 -- valid
  Gieysztoria beklemischevi Luther, 1955 -- valid
  Gieysztoria bellis (Marcus, 1946) -- valid
  Gieysztoria beltrani (Gieysztor, 1931) -- valid
  Gieysztoria bergi (Beklemischev, 1927) -- valid
  Gieysztoria bicoronaria (Fulinski, 1933) -- valid
  Gieysztoria billabongensis Jondelius, 1997 -- valid
  Gieysztoria bimaculata Wang, Lu and Wu, 2013 -- valid
  Gieysztoria blodgetti (Silliman, 1884) -- valid
  Gieysztoria capreola (Steinböck, 1948) -- valid
  Gieysztoria chiqchi Damborenea, Brusa and Noreña, 2005 -- valid
  Gieysztoria chlynovica (Nasonov, 1919) -- valid
  Gieysztoria chlynovica chlynovica (Nasonov, 1919) -- valid
  Gieysztoria chlynovica occidentalis (Nasonov, 1920) -- valid
  Gieysztoria choctaw Van Steenkiste, Gobert and Artois, 2011 -- valid
  Gieysztoria complicata (Fuhrmann, 1914) -- valid
  Gieysztoria coronae Noreña-Janssen, 1995 -- valid
  Gieysztoria cuspidata (Schmidt, 1861) -- valid
  Gieysztoria cypris (Marcus, 1946) -- valid
  Gieysztoria diadema (Hofsten, 1907) -- valid
  Gieysztoria dodgei (Graff, 1911) -- valid
  Gieysztoria donnae Young, 1977 -- valid
  Gieysztoria eastmani (Graff, 1911) -- invalid
  Gieysztoria euchroa (Gieysztor, 1926) -- valid
  Gieysztoria evelinae (Marcus, 1946) -- valid
  Gieysztoria expedita (Hofsten, 1907) -- valid
  Gieysztoria expedita expeditoides Luther, 1955 -- invalid
  Gieysztoria expedita italica Luther, 1955 -- invalid
  Gieysztoria expeditoides Luther, 1955 -- valid
  Gieysztoria falx Brusa, Damborenea and Noreña, 2003 -- valid
  Gieysztoria faubeli Artois, Willems, De Roeck, Jocque and Brendonck, 2005 -- valid
  Gieysztoria foreli (Hofsten, 1911) -- valid
  Gieysztoria garudae Van Steenkiste, Van Mulken and Artois, 2012 -- valid
  Gieysztoria guangdongensis Wang and Xia, 2013 -- valid
  Gieysztoria huizhouensis Zhang, Wu and Wang, 2014 -- valid
  Gieysztoria hymanae (Marcus, 1946) -- valid
  Gieysztoria iberica Van Steenkiste, Tessens, Krznaric and Artois, 2011 -- valid
  Gieysztoria inflata (Okugawa, 1930) -- valid
  Gieysztoria infundibuliformis (Fuhrmann, 1894) -- valid
  Gieysztoria intricata (Marcus, 1946) -- valid
  Gieysztoria isoldeae Artois, Willems, De Roeck, Jocque and Brendonck, 2005 -- valid
  Gieysztoria italica Luther, 1955 -- valid
  Gieysztoria japonica (Okugawa, 1930) -- valid
  Gieysztoria joannae Young, 1977 -- valid
  Gieysztoria kasasapa Damborenea, Brusa and Noreña, 2005 -- valid
  Gieysztoria knipovici (Beklemischev, 1953) -- valid
  Gieysztoria koiwi (Eggers, 1925) -- valid
  Gieysztoria kolasai Young, 1977 -- valid
  Gieysztoria lugubris (Reisinger, 1924) -- valid
  Gieysztoria lugubris lugubris (Reisinger, 1924) -- valid
  Gieysztoria lugubris wigrensis (Gieysztor, 1938) -- valid
  Gieysztoria macrovariata (Weise, 1942) -- valid
  Gieysztoria macrovariata macrovariata (Weise, 1942) -- valid
  Gieysztoria macrovariata nonaspinosa Luther, 1955 -- valid
  Gieysztoria maritima Luther, 1955 -- valid
  Gieysztoria matilde Brusa, Damborenea and Noreña, 2008 -- valid
  Gieysztoria minima (Riedel, 1932) -- valid
  Gieysztoria multiovata Luther, 1955 -- invalid
  Gieysztoria namuncurai Damborenea, Brusa and Noreña, 2007 -- valid
  Gieysztoria octospinosa Luther, 1955 -- valid
  Gieysztoria okugawai (Ruebush and Hayes, 1939) -- valid
  Gieysztoria oligocentra (Steinböck, 1948) -- valid
  Gieysztoria ornata (Hofsten, 1907) -- valid
  Gieysztoria ornata drozdovicensis (Fulinski, 1915) -- valid
  Gieysztoria ornata maritima Luther, 1955 -- invalid
  Gieysztoria ornata ornata (Hofsten, 1907) -- valid
  Gieysztoria oryzae (Nasonov, 1929) -- valid
  Gieysztoria papii Young, 1977 -- valid
  Gieysztoria pavimentata (Beklemischev, 1919) -- valid
  Gieysztoria pisana Kolasa, 1981 -- valid
  Gieysztoria pseudoblodgetti Luther, 1955 -- valid
  Gieysztoria pseudodiadema Noreña-Janssen, 1995 -- valid
  Gieysztoria pulchra Wang and Deng, 2006 -- valid
  Gieysztoria qixingyanensis Wang and Rong, 2016 -- valid
  Gieysztoria quadrata Noreña-Janssen, 1995 -- valid
  Gieysztoria quadridens (Böhmig, 1898) -- valid
  Gieysztoria quadridensoides (Fuhrmann, 1914) -- valid
  Gieysztoria queenslandica Hochberg and Cannon, 2001 -- valid
  Gieysztoria ramayana Van Steenkiste, Van Mulken and Artois, 2012 -- valid
  Gieysztoria rastafariae Therriault and Kolasa, 1999 -- invalid
  Gieysztoria reggae Therriault and Kolasa, 1999 -- valid
  Gieysztoria rubra (Fuhrmann, 1894) -- valid
  Gieysztoria rubra caucasica (Nasonov, 1919) -- valid
  Gieysztoria rubra frankia (Nasonov, 1919) -- valid
  Gieysztoria rubra intermedia (Gieysztor, 1931) -- valid
  Gieysztoria rubra rubra (Fuhrmann, 1894) -- valid
  Gieysztoria rubra typica (Gieysztor, 1931) -- valid
  Gieysztoria saganae Young, 1977 -- valid
  Gieysztoria santafeensis Noreña-Janssen, 1995 -- valid
  Gieysztoria sasa Damborenea, Brusa and Noreña, 2005 -- valid
  Gieysztoria semispinosa (Fulinski and Szynal, 1927) -- valid
  Gieysztoria shantouensis Zhang, Li and Wang, 2014 -- valid
  Gieysztoria shenzhensis Wang and Wu, 2005 -- valid
  Gieysztoria shiyanensis Wang and Xia, 2014 -- valid
  Gieysztoria sibirica (Plotnikow, 1905) -- valid
  Gieysztoria stokesi Van Steenkiste and Artois, 2012 -- valid
  Gieysztoria subsalsa Luther, 1955 -- valid
  Gieysztoria superba Hartenstein and Dwine, 2000 -- valid
  Gieysztoria taurica (Nasonov, 1923) -- valid
  Gieysztoria therapaina (Marcus, 1946) -- valid
  Gieysztoria thienemanni (Reisinger, 1933) -- valid
  Gieysztoria thymara (Marcus, 1946) -- valid
  Gieysztoria tigrensis Noreña-Janssen, 1995 -- valid
  Gieysztoria transilvana (Paradi, 1882) -- valid
  Gieysztoria triangulata (Robeson, 1931) -- valid
  Gieysztoria tridesma (Marcus, 1946) -- valid
  Gieysztoria triquetra (Fuhrmann, 1894) -- valid
  Gieysztoria triquetra orientalis (Nasonov, 1929) -- valid
  Gieysztoria triquetra triquetra (Fuhrmann, 1894) -- valid
  Gieysztoria trisolena (Marcus, 1946) -- valid
  Gieysztoria uncia (Marcus, 1946) -- valid
  Gieysztoria variata Noreña-Janssen, 1995 -- valid
  Gieysztoria virgulifera (Plotnikow, 1906) -- valid
  Gieysztoria wuyishanensis Wang and Lai, 2013 -- valid
  Gieysztoria zuluensis Van Steenkiste and Artois, 2012 -- valid
  Gieysztoria zykovi (Nasonov, 1919) -- valid
  Gigantea Ogren and Kawakatsu, 1990 -- valid
  Gigantea bistriata (Hyman, 1962) -- valid
  Gigantea cameliae (Fuhrmann, 1912) -- valid
  Gigantea chiriquii (Hyman, 1962) -- valid
  Gigantea gigantea (Graff, 1899) -- valid
  Gigantea gouvernoni Jones and Sterrer, 2005 -- valid
  Gigantea idaia (Du Bois-Reymond Marcus, 1951) -- valid
  Gigantea maupoi Carbayo, 2008 -- valid
  Gigantea montana (Hyman, 1939) -- valid
  Gigantea picadoi (de Beauchamp, 1912) -- valid
  Gigantea sandersoni (Prudhoe, 1949) -- valid
  Gigantea unicolor (Hyman, 1955) -- valid
  Gigantea urubambensis Negrete, Brusa and Carbayo, 2010 -- valid
  Gigantea vongunteni (Fuhrmann, 1912) -- valid
  Girardia Ball, 1974 -- valid
  Girardia anceps (Kenk, 1930) -- valid
  Girardia anderlani (Kawakatsu and Hauser, 1983) -- valid
  Girardia andina (Borelli, 1895) -- valid
  Girardia antillana (Kenk, 1941) -- valid
  Girardia arimana (Hyman, 1957) -- valid
  Girardia arizonensis (Kenk, 1975) -- valid
  Girardia arndti (Marcus, 1946) -- valid
  Girardia aurita (Kennel, 1888) -- valid
  Girardia avertiginis Sluys, 2005 -- valid
  Girardia azteca (Benazzi and Giannini, 1971) -- valid
  Girardia barbarae (Mitchell and Kawakatsu, 1973) -- valid
  Girardia biapertura Sluys, 1997 -- valid
  Girardia bonaerensis (Moretto, 1996) -- valid
  Girardia bursalacertosa Sluys, 2005 -- valid
  Girardia cameliae (Fuhrmann, 1914) -- valid
  Girardia canai Curino and Cazzaniga, 1993 -- valid
  Girardia capacivasa Sluys and Kawakatsu, 2005 -- valid
  Girardia chilla (Marcus, 1954) -- valid
  Girardia cubana (Codreanu and Balcesco, 1973) -- valid
  Girardia desiderensis Souza and Leal-Zanchet, 2016 -- valid
  Girardia dimorpha (Böhmig, 1902) -- invalid
  Girardia dorotocephala (Woodworth, 1897) -- valid
  Girardia dubia (Borelli, 1895) -- invalid
  Girardia festai (Borelli, 1898) -- valid
  Girardia festai albolineata (Borelli, 1898) -- valid
  Girardia festai festai (Borelli, 1898) -- valid
  Girardia glandulosa (Kenk, 1930) -- invalid
  Girardia graffi (Weiss, 1909) -- valid
  Girardia guatemalensis (Mitchell and Kawakatsu, 1973) -- valid
  Girardia hoernesi (Weiss, 1909) -- invalid
  Girardia hypoglauca (Marcus, 1948) -- valid
  Girardia informis Sluys and Grant, 2006 -- valid
  Girardia jenkinsae (Benazzi and Gourbault, 1977) -- valid
  Girardia jimi (Martins, 1970) -- invalid
  Girardia jugosa Sluys, 2005 -- valid
  Girardia longistriata (Fuhrmann, 1914) -- valid
  Girardia mckenziei (Mitchell and Kawakatsu, 1973) -- valid
  Girardia microbursalis (Hyman, 1931) -- invalid
  Girardia miltgeni (Gourbault, 1980) -- invalid
  Girardia multidiverticulata Souza, Morais, Cordeiro and Leal-Zanchet, 2015 -- valid
  Girardia nonatoi (Marcus, 1946) -- invalid
  Girardia paramensis (Fuhrmann, 1914) -- valid
  Girardia pierremartini Souza and Leal-Zanchet, 2016 -- valid
  Girardia polyorchis (Fuhrmann, 1914) -- invalid
  Girardia rincona (Marcus, 1954) -- valid
  Girardia sanchezi (Hyman, 1955) -- valid
  Girardia schubarti (Marcus, 1946) -- valid
  Girardia seclusa (de Beauchamp, 1940) -- invalid
  Girardia sinensis Chen and Wang, 2015 -- valid
  Girardia sphincter Sluys and Kawakatsu, 2001 -- valid
  Girardia striata (Weiss, 1910) -- valid
  Girardia tahitiensis (Gourbault, 1977) -- valid
  Girardia tigrina (Girard, 1850) -- valid
  Girardia titicacana (Hyman, 1939) -- valid
  Girardia typhlomexicana (Mitchell and Kawakatsu, 1973) -- valid
  Girardia ururiograndeana (Kawakatsu, Hauser and Ponce de Leon, 1992) -- valid
  Girardia veneranda (Martins, 1970) -- invalid
  Glanduloderma Jaegersten, 1940 -- valid
  Glanduloderma myzostomatis Jaegersten, 1940 -- valid
  Globuliphora Westblad, 1952 -- invalid
  Globuliphora rufifrons Westblad, 1952 -- invalid
  Globuliphorinae Westblad, 1952 -- invalid
  Glossostoma Le Conte, 1851 -- valid
  Glossostoma nematoideum Le Conte, 1851 -- valid
  Glyphorhynchus Hällström and Luther in Luther, 1907 -- invalid
  Glyphorhynchus turgida (Zacharias, 1902) -- invalid
  Gnathorhynchidae Meixner, 1929 -- valid
  Gnathorhynchus Meixner, 1929 -- valid
  Gnathorhynchus aprosmeno An der Lan, 1967 -- valid
  Gnathorhynchus conocaudatus Meixner, 1929 -- valid
  Gnathorhynchus hastatus Meixner, 1929 -- invalid
  Gnathorhynchus inermis Schilke, 1970 -- valid
  Gnathorhynchus krogeni Karling, 1947 -- invalid
  Gnathorhynchus lobatus (Ax, 1952) -- invalid
  Gnathorhynchus riseri Karling, 1995 -- valid
  Gnathorhynchus rostellatus Brunet, 1973 -- valid
  Gnesioceros Diesing, 1862 -- valid
  Gnesioceros floridana (Pearse, 1938) -- valid
  Gnesioceros mertensi (Diesing, 1850) -- invalid
  Gnesioceros pellucidus (Mertens, 1833) -- invalid
  Gnesioceros sargassicola (Mertens, 1833) -- valid
  Gnesioceros sargassicola lata Hyman, 1939 -- valid
  Gnesioceros sargassicola sargassicola (Mertens, 1833) -- valid
  Gnesioceros verrilli Hyman, 1939 -- invalid
  Gnesiocerotidae Marcus and Marcus, 1966 -- valid
  Gnorimorhynchus Brunet, 1972 -- valid
  Gnorimorhynchus dividuus Brunet, 1972 -- valid
  Gnosonesima Reisinger, 1926 -- valid
  Gnosonesima antarctica Reisinger, 1926 -- valid
  Gnosonesima borealis (Westblad, 1952) -- valid
  Gnosonesima brattstroemi Karling, 1968 -- valid
  Gnosonesima mediterranea Martens and Schockaert, 1985 -- valid
  Gnosonesima reisingeri Karling, 1968 -- valid
  Gnosonesima tropicalis Schockaert and Martens, 1985 -- valid
  Gnosonesimidae Reisinger, 1926 -- valid
  Gnosonesimila Westblad, 1952 -- invalid
  Gnosonesimila borealis Westblad, 1952 -- invalid
  Goharia Beltagi, 1958 -- invalid
  Goharia obscuria Beltagi, 1958 -- invalid
  Goniocarena Schmarda, 1859 -- invalid
  Goniocarena capitata (Ĝrsted, 1844) -- invalid
  Gonostomula Westblad, 1955 -- valid
  Gonostomula anocelis Westblad, 1955 -- valid
  Graffia Levinsen, 1879 -- invalid
  Graffia capitata Levinsen, 1879 -- invalid
  Graffiella Korotneff, 1912 -- invalid
  Graffiella lamelli-rostris Korotneff, 1912 -- invalid
  Graffilla Ihering, 1880 -- valid
  Graffilla brauni Schmidt, 1886 -- valid
  Graffilla buccinicola Jameson, 1897 -- valid
  Graffilla curiosa Westblad, 1954 -- valid
  Graffilla gemellipara Linton, 1910 -- invalid
  Graffilla muricicola Ihering, 1880 -- valid
  Graffilla mytili (Levinsen, 1879) -- valid
  Graffilla parasitica (Czerniavsky, 1881) -- valid
  Graffilla pugetensis Schell, 1986 -- valid
  Graffilla tethydicola Graff, 1882 -- invalid
  Graffillidae Graff, 1904 -- valid
  Graffillinae Graff, 1904 -- valid
  Graffizoon Heath, 1928 -- valid
  Graffizoon lobatum Heath, 1928 -- valid
  Groveia Karling, 1980 -- valid
  Groveia unicornis Karling, 1980 -- valid
  Gullmariella Luther, 1948 -- valid
  Gullmariella vivipara Luther, 1948 -- valid
  Gunda Schmidt, 1862 -- invalid
  Gunda graffi Böhmig, 1893 -- invalid
  Gunda lobata Schmidt, 1861 -- invalid
  Gunda munda Wilhelmi, 1911 -- invalid
  Gunda ohlini Bergendal, 1899 -- invalid
  Gunda plebeia Schmidt, 1861 -- invalid
  Gunda segmentata Lang, 1881 -- invalid
  Gunda segmentatoides Bergendal, 1899 -- invalid
  Gunda ulvae Ĝrsted, 1843 -- invalid
  Gunda variabilis Böhmig, 1902 -- invalid
  Gunda variabilis isabellina Böhmig, 1902 -- invalid
  Gusana E. M. Froehlich, 1978 -- valid
  Gusana cruciata (Graff, 1899) -- valid
  Gusana lata (Graff, 1899) -- valid
  Gusana platei (Graff, 1899) -- valid
  Gyrator Ehrenberg, 1831 -- invalid
  Gyrator album Silliman, 1884 -- invalid
  Gyrator assimilis Levinsen, 1879 -- invalid
  Gyrator banaticus (Graff, 1875) -- invalid
  Gyrator bivittatus Uljanin, 1870 -- invalid
  Gyrator botterii (Schmidt, 1852) -- invalid
  Gyrator caledonicus (Claparède, 1861) -- invalid
  Gyrator coecus (Vejdovsky, 1880) -- invalid
  Gyrator croceus (Fabricius, 1826) -- invalid
  Gyrator danielsoni Jensen, 1878 -- invalid
  Gyrator erythrophthalmus (Schmarda, 1859) -- invalid
  Gyrator fabricii Jensen, 1878 -- invalid
  Gyrator furiosus (Schmidt, 1857) -- invalid
  Gyrator groenlandicus (Levinsen, 1879) -- invalid
  Gyrator helgolandicus (Metschnikoff, 1865) -- invalid
  Gyrator helgolandicus Attems, 1897 -- invalid
  Gyrator hermaphroditus (Ehrenberg, 1831) -- invalid
  Gyrator immundus (Schmidt, 1857) -- invalid
  Gyrator leucophraeus (Fabricius, 1826) -- invalid
  Gyrator littorales Ĝrsted, 1843 -- invalid
  Gyrator marginstus Graff, 1882 -- invalid
  Gyrator notops (A. L. Dugès, 1828) -- invalid
  Gyrator papillosus (Schmarda, 1859) -- invalid
  Gyrator reticulatus Sekera, 1901 -- invalid
  Gyrator schmidtii Jensen, 1878 -- invalid
  Gyrator steenstrupii (Schmidt, 1852) -- invalid
  Gyrator suboviformis Ĝrsted, 1843 -- invalid
  Gyrator tetrophthalmus (Schmarda, 1859) -- invalid
  Gyrator viridis Busch, 1851 -- invalid
  Gyratoris Diesing, 1862 -- invalid
  Gyratoris viridis Busch, 1851 -- invalid
  Gyratricella Karling, 1955 -- valid
  Gyratricella attemsi (Graff, 1896) -- valid
  Gyratricidae Graff, 1905 -- invalid
  Gyratricinae Graff, 1905 -- valid
  Gyratrix Ehrenberg, 1831 -- valid
  Gyratrix arenarius Evdonin, 1971 -- invalid
  Gyratrix attemsi Graff, 1896 -- invalid
  Gyratrix hermaphroditicus Ehrenberg, 1831 -- invalid
  Gyratrix hermaphroditus Ehrenberg, 1831 -- valid
  Gyratrix hermaphroditus coeca (Vejdovsky, 1880) -- valid
  Gyratrix hermaphroditus hermaphroditus Ehrenberg, 1831 -- valid
  Gyratrix hermaphroditus maculata Graff, 1911 -- valid
  Gyratrix proaviformis Karling and Schockaert, 1977 -- valid
  Gyratrix proavus Meixner, 1938 -- valid
  Gyratrix sinensis Wang and Li, 2005 -- valid
  Haga Schmidt, 1861 -- invalid
  Haga plebeia Schmidt, 1861 -- invalid
  Halammovortex Karling, 1943 -- valid
  Halammovortex eastmani (Graff, 1911) -- valid
  Halammovortex lewisi (Jones and Ferguson, 1948) -- valid
  Halammovortex macropharynx (Meixner, 1938) -- valid
  Halammovortex nigrifrons (Karling, 1935) -- valid
  Halammovortex promacropharynx Ax, 2008 -- valid
  Halammovortex pseudonigrifrons Ax, 2008 -- valid
  Halammovortex supranigrifrons Ax, 2008 -- valid
  Hallangia Westblad, 1946 -- valid
  Hallangia evelinae Marcus, 1952 -- invalid
  Hallangia proporoides Westblad, 1946 -- valid
  Hallangiidae Westblad, 1946 -- valid
  Hallezia Graff, 1908 -- invalid
  Hallezia sarsi (Jensen, 1878) -- invalid
  Haloplanella Luther, 1946 -- valid
  Haloplanella carolinensis Ax, 2008 -- valid
  Haloplanella conversa Ehlers and Sopott-Ehlers, 1989 -- valid
  Haloplanella curvistyla Luther, 1946 -- valid
  Haloplanella evelinae Marcus, 1954 -- valid
  Haloplanella hamulata Ehlers, 1974 -- valid
  Haloplanella ibla Marcus, 1952 -- valid
  Haloplanella longatuba Ax and Heller, 1970 -- valid
  Haloplanella minuta Luther, 1946 -- valid
  Haloplanella multifida Riedl, 1954 -- valid
  Haloplanella obtusituba Luther, 1946 -- valid
  Haloplanella pusilla Riedl, 1959 -- valid
  Haloplanella semicircula Ehlers and Sopott-Ehlers, 1989 -- valid
  Haloplanella semicircula sancristobalensis Ehlers and Sopott-Ehlers, 1989 -- valid
  Haloplanella semicircula santacruzensis Ehlers and Sopott-Ehlers, 1989 -- valid
  Haloplanella semicircula semicircula Ehlers and Sopott-Ehlers, 1989 -- valid
  Hangethellia Karling, 1940 -- valid
  Hangethellia calceifera Karling, 1940 -- valid
  Hangethellia calceifera calceifera Karling, 1940 -- valid
  Hangethellia calceifera norwegica Karling, 1940 -- valid
  Haplocelis Dörjes, 1968 -- valid
  Haplocelis dichona (Marcus, 1954) -- valid
  Haplodidymos Hochberg and Cannon, 2002 -- valid
  Haplodidymos rubroculatus Hochberg and Cannon, 2002 -- valid
  Haplodiscus Weldon, 1888 -- valid
  Haplodiscus acuminatus Böhmig, 1895 -- valid
  Haplodiscus agilis Beklemischev, 1927 -- invalid
  Haplodiscus bocki Dörjes, 1970 -- valid
  Haplodiscus incola (Leiper, 1902) -- valid
  Haplodiscus obtusus Böhmig, 1895 -- valid
  Haplodiscus orbicularis Böhmig, 1895 -- invalid
  Haplodiscus ovatus Böhmig, 1895 -- valid
  Haplodiscus piger Weldon, 1888 -- valid
  Haplodiscus scutiformis Böhmig, 1895 -- invalid
  Haplodiscus ussowi Sabussow, 1896 -- invalid
  Haplodiscus weldoni Böhmig, 1895 -- valid
  Haplogonaria Dörjes, 1968 -- valid
  Haplogonaria amarilla Hooge and Eppinger, 2005 -- valid
  Haplogonaria arenaria (Ax, 1959) -- valid
  Haplogonaria arenicolae Faubel and Warwick, 2005 -- invalid
  Haplogonaria baki Hooge and Tyler, 2015 -- valid
  Haplogonaria elegans Faubel, 1976 -- valid
  Haplogonaria glandulifera Dörjes, 1968 -- valid
  Haplogonaria idia (Marcus, 1954) -- valid
  Haplogonaria macrobursalia Dörjes, 1968 -- valid
  Haplogonaria minima (Westblad, 1946) -- valid
  Haplogonaria pellita (Marcus, 1951) -- valid
  Haplogonaria phyllospadicis Hooge and Tyler, 2003 -- valid
  Haplogonaria psammalia Faubel, 1974 -- valid
  Haplogonaria schillingi Hooge and Tyler, 2015 -- valid
  Haplogonaria simplex Dörjes, 1968 -- valid
  Haplogonaria sinubursalia Dörjes, 1968 -- valid
  Haplogonaria sophiae Hooge and Rocha, 2006 -- valid
  Haplogonaria stradbrokensis Hooge, 2003 -- valid
  Haplogonaria syltensis Dörjes, 1968 -- invalid
  Haplogonaria viridis Dörjes, 1968 -- invalid
  Haploophorum Marcus, 1948 -- invalid
  Haploophorum caudatum (Levinsen, 1879) -- invalid
  Haploophorum elachisterum Marcus, 1948 -- invalid
  Haploophorum groenlandicum (Levinsen, 1879) -- invalid
  Haploophorum obscurum (An der Lan, 1936) -- invalid
  Haploophorum reticulatum (Schmidt, 1852) -- invalid
  Haploophorum siphonophorum (An der Lan, 1936) -- invalid
  Haplopharyngida Karling, 1974 -- valid
  Haplopharyngidae Meixner, 1938 -- valid
  Haplopharynx Meixner, 1938 -- valid
  Haplopharynx papii Schockaert, 2014 -- valid
  Haplopharynx quadristimulus Ax, 1971 -- valid
  Haplopharynx rostratus Meixner, 1938 -- valid
  Haploplana Laidlaw, 1903 -- invalid
  Haploplana elioti Laidlaw, 1903 -- invalid
  Haploposthia An der Lan, 1936 -- valid
  Haploposthia albiventer Marcus, 1954 -- invalid
  Haploposthia brunea An der Lan, 1936 -- valid
  Haploposthia erythrocephala Kozloff, 2000 -- valid
  Haploposthia lactomaculata Tekle, 2004 -- valid
  Haploposthia microphoca Marcus, 1950 -- valid
  Haploposthia monogonophora Westblad, 1946 -- invalid
  Haploposthia opisthorcus Mamkaev, 1967 -- valid
  Haploposthia pellucidus (Westblad, 1942) -- valid
  Haploposthia rubra (An der Lan, 1936) -- valid
  Haploposthia rubropunctata Westblad, 1945 -- valid
  Haploposthia vandula Hooge and Tyler, 2002 -- valid
  Haploposthia viridis An der Lan, 1936 -- invalid
  Haploposthiidae Westblad, 1948 -- invalid
  Haplorhynchella Meixner, 1924 -- valid
  Haplorhynchella paludicola Meixner, 1924 -- valid
  Haplotestis Dörjes, 1968 -- valid
  Haplotestis curvitubus Dörjes, 1968 -- valid
  Haplovejdovskya Ax, 1954 -- valid
  Haplovejdovskya scilliensis Faubel and Warwick, 2005 -- valid
  Haplovejdovskya subterranea Ax, 1954 -- valid
  Haplovejdovskyinae Luther, 1962 -- valid
  Haplovortex Reisinger, 1924 -- valid
  Haplovortex brevitubus (Luther, 1918) -- invalid
  Haplovortex bryophilus Reisinger, 1924 -- valid
  Harenorhynchus Hoxhold, 1974 -- invalid
  Harenorhynchus proterandrius Hoxhold, 1974 -- invalid
  Harsa Marcus, 1951 -- valid
  Harsa obnixa Marcus, 1951 -- valid
  Hartogia Mack-Fira, 1968 -- valid
  Hartogia pontica Mack-Fira, 1968 -- valid
  Hartogia rosacea Mack-Fira, 1969 -- valid
  Hausera Leal-Zanchet and Souza, 2014 -- valid
  Hausera hauseri Leal-Zanchet and Souza, 2014 -- valid
  Hawadlia Schockaert, 1971 -- valid
  Hawadlia papii Schockaert, 1971 -- valid
  Heptacraspedella Cannon and Sewell, 1995 -- valid
  Heptacraspedella peratus Cannon and Sewell, 1995 -- valid
  Heroplana Faubel, 1983 -- valid
  Heroplana bayeri (Marcus and Marcus, 1968) -- valid
  Hesiolicium Crezee and Tyler, 1976 -- valid
  Hesiolicium inops Crezee and Tyler, 1976 -- valid
  Heterochaerus Haswell, 1905 -- valid
  Heterochaerus australis Haswell, 1905 -- valid
  Heterochaerus blumi (Achatz, Hooge and Tyler, 2007) -- valid
  Heterochaerus carvalhoi (Marcus, 1952) -- valid
  Heterochaerus langerhansi (Graff, 1882) -- valid
  Heterochaerus sargassi (Hyman, 1939) -- valid
  Heteromonocelis Miller and Faubel, 2003 -- valid
  Heteromonocelis australiensis Miller and Faubel, 2003 -- valid
  Heteroplana Willey, 1897 -- invalid
  Heteroplana newtoni Willey, 1897 -- invalid
  Heterostylochus Verrill, 1893 -- invalid
  Heterostylochus maculata (Quatrefage, 1845) -- invalid
  Heterostylochus maculatus (Quatrefage, 1845) -- invalid
  Hofstenia Bock, 1923 -- valid
  Hofstenia arabiensis Beltagi and Mandura, 1991 -- valid
  Hofstenia atroviridis Bock, 1923 -- valid
  Hofstenia beltagii Steinböck, 1966 -- valid
  Hofstenia giselae Steinböck, 1966 -- invalid
  Hofstenia miamia Correa, 1960 -- valid
  Hofstenia minuta Palombi, 1928 -- valid
  Hofstenia tinga Du Bois-Reymond Marcus, 1957 -- invalid
  Hofstenia viridis An der Lan, 1936 -- invalid
  Hofsteniidae Bock, 1923 -- valid
  Hofsteniola Papi, 1957 -- valid
  Hofsteniola pardii Papi, 1957 -- valid
  Hofstenioplesia Steinböck and Reisinger, 1924 -- valid
  Hofstenioplesia haswelli (Steinböck and Reisinger, 1924) -- valid
  Hoplopera Reisinger, 1924 -- valid
  Hoplopera littoralis Karling, 1957 -- valid
  Hoplopera macropharynx Reisinger, 1924 -- valid
  Hoplopera maculata Reisinger, 1924 -- valid
  Hoplopera opaca Reisinger, 1924 -- valid
  Hoplopera pusilla Ehlers, 1974 -- valid
  Hoploplana Laidlaw, 1902 -- valid
  Hoploplana californica Hyman, 1953 -- valid
  Hoploplana cupida Kato, 1938 -- valid
  Hoploplana deanna Kato, 1939 -- valid
  Hoploplana divae Marcus, 1950 -- valid
  Hoploplana elisabelloi Noreña, Rodriquez, Perez and Almon, 2015 -- valid
  Hoploplana grubei (Graff, 1892) -- invalid
  Hoploplana inquilina (Wheeler, 1894) -- valid
  Hoploplana inquilina thaisana Pearse, 1938 -- invalid
  Hoploplana insignis (Lang, 1884) -- valid
  Hoploplana luracola Smith, 1961 -- valid
  Hoploplana ornata Yeri and Kaburaki, 1918 -- valid
  Hoploplana papillosa (Lang, 1884) -- valid
  Hoploplana rosea Prudhoe, 1977 -- valid
  Hoploplana rubra Kato, 1944 -- valid
  Hoploplana schizoparellae Kato, 1944 -- invalid
  Hoploplana schizoporellae Kato, 1944 -- valid
  Hoploplana thaisana Pearse, 1938 -- invalid
  Hoploplana usaguia Smith, 1960 -- valid
  Hoploplana villosa (Lang, 1884) -- valid
  Hoploplanidae Stummer-Traunfels, 1933 -- invalid
  Humbertium Ogren and Sluys, 2001 -- valid
  Humbertium ceres (Moseley, 1874) -- valid
  Humbertium core (de Beauchamp, 1930) -- valid
  Humbertium depressum (Ritter-Zahony, 1905) -- valid
  Humbertium diana (Humbert and Claparède, 1862) -- valid
  Humbertium dodabettae (de Beauchamp, 1930) -- valid
  Humbertium ferrugineoideum (Sabussow, 1925) -- valid
  Humbertium ferrugineum (Graff, 1899) -- valid
  Humbertium girardi (Graff, 1899) -- valid
  Humbertium kelleri (Graff, 1899) -- valid
  Humbertium longicanale (Sabussow, 1925) -- valid
  Humbertium negritorum palnisium (de Beauchamp, 1930) -- invalid
  Humbertium palnisium (de Beauchamp, 1930) -- valid
  Humbertium penangense (Kawakatsu, 1986) -- valid
  Humbertium penrissenense (de Beauchamp, 1925) -- valid
  Humbertium phebe (Humbert and Claparède, 1862) -- valid
  Humbertium phebe phebe (Humbert and Claparède, 1862) -- valid
  Humbertium phebe transversefasciatum (J. Müller, 1902) -- valid
  Humbertium proserpina (Humbert and Claparède, 1862) -- valid
  Humbertium pseudophallicum (de Beauchamp, 1925) -- valid
  Humbertium ravenalae (Graff, 1899) -- valid
  Humbertium sikorai (Graff, 1899) -- valid
  Humbertium subboreale (Sabussow, 1925) -- invalid
  Humbertium umbrinum (Geba, 1909) -- valid
  Humbertium univittatum (Grube, 1866) -- valid
  Humbertium univittatum subboreale (Sabussow, 1925) -- valid
  Humbertium univittatum univittatum (Grube, 1866) -- valid
  Humbertium voigti (Graff, 1899) -- valid
  Humbertium woodworthi (Graff, 1899) -- valid
  Hydrolimax Haldeman, 1842 -- valid
  Hydrolimax bruneus Girard, 1891 -- valid
  Hydrolimax grisea Haldeman, 1843 -- valid
  Hylocelis Faubel, 1983 -- valid
  Hylocelis californica (Heath and McGregor, 1912) -- valid
  Hylocelis diabloensis Bulnes, Faubel and Ponce de Leon, 2003 -- valid
  Hylocelis huina (Marcus, 1954) -- valid
  Hymanella Castle, 1941 -- valid
  Hymanella baicalensis Timoshkin and Porfirieva, 1989 -- valid
  Hymanella retenuova Castle, 1941 -- valid
  Hymania Pearse and Littler, 1938 -- invalid
  Hymania prytherchi Pearse and Littler, 1938 -- invalid
  Hyperbulbina Livanov and Porfirieva, 1962 -- valid
  Hyperbulbina bekmanae Porfirieva, 1977 -- valid
  Hyperbulbina bifasciata (Sabussow, 1903) -- valid
  Hyperbulbina dybowskyi (Sabussow, 1903) -- valid
  Hyperbulbina graffi (Sabussow, 1903) -- invalid
  Hyperbulbina grubei (Sabussow, 1903) -- valid
  Hyperbulbina nana Porfirieva, 1977 -- valid
  Hyperpapillina Porfirieva, 1973 -- valid
  Hyperpapillina graffi (Sabussow, 1903) -- valid
  Hyperpapillina ocellata (Korotneff, 1912) -- valid
  Hypoblepharina Böhmig, 1914 -- valid
  Hypoblepharina boehmigi Karling, 1973 -- valid
  Hypoblepharina difficilis Böhmig, 1914 -- valid
  Hypoblepharina serrifera Karling and Nilsson, 1974 -- valid
  Hypoblepharina truncata Böhmig, 1914 -- valid
  Hypoblepharina vanhoffeni Böhmig, 1914 -- valid
  Hypoblepharinidae Böhmig, 1914 -- valid
  Hyporcus Graff, 1905 -- invalid
  Hyporcus breitfussi Graff, 1905 -- invalid
  Hyporcus venenosus (Uljanin, 1870) -- invalid
  Hyporhynchus Graff, 1882 -- invalid
  Hyporhynchus armatus (Jensen, 1878) -- invalid
  Hyporhynchus breitfussi (Graff, 1905) -- invalid
  Hyporhynchus coronatus Graff, 1882 -- invalid
  Hyporhynchus intermedius Attems, 1897 -- invalid
  Hyporhynchus mirabilis Pereyaslawzewa, 1892 -- invalid
  Hyporhynchus neocomensis Fuhrmann, 1904 -- invalid
  Hyporhynchus penicillatus (Schmidt, 1857) -- invalid
  Hyporhynchus piriformis Pereyaslawzewa, 1892 -- invalid
  Hyporhynchus setigerus (Schmidt, 1852) -- invalid
  Hyporhynchus venenosus (Uljanin, 1870) -- invalid
  Hypostomum Schmidt, 1848 -- invalid
  Hypostomum viride Schmidt, 1848 -- invalid
  Hypotrichina Calandruccio, 1897 -- invalid
  Hypotrichina circinnata Calandruccio, 1897 -- invalid
  Hypotrichina marsiliensis Calandruccio, 1897 -- invalid
  Hypotrichina sicula Calandruccio, 1897 -- invalid
  Hypotrichina tergestina Calandruccio, 1897 -- invalid
  Hypotrichinidae Bresslau, 1928 -- invalid
  Ichthyophaga Syromjatnikova, 1949 -- invalid
  Ichthyophaga subcutanea Syromjatnikova, 1949 -- invalid
  Idioplana Woodworth, 1898 -- valid
  Idioplana atlantica (Bock, 1913) -- valid
  Idioplana australiensis Woodworth, 1898 -- valid
  Idioplana australiensis Palombi, 1928 -- invalid
  Idioplana insignis (Laidlaw, 1904) -- valid
  Idioplana pacifica Kato, 1943 -- invalid
  Idioplaninae Bresslau, 1933 -- invalid
  Idioplanoides Barbour, 1912 -- invalid
  Idioplanoides atlantica (Bock, 1913) -- invalid
  Idioplanoides insignis (Laidlaw, 1904) -- invalid
  Igluta Marcus and Marcus, 1968 -- invalid
  Igluta tipuca Marcus and Marcus, 1968 -- invalid
  Ijimia Bergendal, 1890 -- invalid
  Ijimia cornuta (Johnston, 1822) -- invalid
  Ijimia felina (Dalyell, 1814) -- invalid
  Ijimia linkoi (Sabussow, 1901) -- invalid
  Ijimia oculimarginata (Palombi, 1931) -- invalid
  Ijimia tenuis (Ijima, 1884) -- invalid
  Ijimia tenuis altaica Livanov and Zabusova, 1940 -- invalid
  Ijimia tothi (Méhely, 1927) -- invalid
  Ilyella Faubel, 1983 -- valid
  Ilyella gigas (Schmarda, 1859) -- valid
  Ilyella purpurea (Stummer-Traunfels, 1933) -- valid
  Ilyella yrsa (Marcus and Marcus, 1968) -- valid
  Ilyplana Bock, 1925 -- valid
  Ilyplana aberrans Bock, 1925 -- valid
  Ilyplana mitsui (Kato, 1944) -- valid
  Ilyplanidae Faubel, 1983 -- valid
  Ilyplanoidea Faubel, 1983 -- valid
  Ilyplanoides Kato, 1944 -- invalid
  Ilyplanoides mitsui Kato, 1944 -- invalid
  Ilyplanoides mitsuii Kato, 1944 -- invalid
  Imbira Carbayo, Alvarez-Presas, Olivares, Marques, E. M. Froehlich and Riutort, 2013 -- valid
  Imbira guaiana (Leal-Zanchet and Carbayo, 2001) -- valid
  Imbira marcusi Carbayo, Alvarez-Presas, Olivares, Marques, E. M. Froehlich and Riutort, 2013 -- valid
  Imogine Girard, 1853 -- valid
  Imogine aomori (Kato, 1937) -- valid
  Imogine arenosus (Willey, 1897) -- valid
  Imogine catus (Du Bois-Reymond Marcus, 1958) -- valid
  Imogine ceylanicus (Laidlaw, 1904) -- valid
  Imogine conoceraea Schmarda, 1859 -- invalid
  Imogine exiguus (Hyman, 1953) -- valid
  Imogine fafai Marquina, Fernández-Álvarez and Noreña, 2015 -- valid
  Imogine hamanensis (Kato, 1944) -- valid
  Imogine hyalinus (Bock, 1913) -- valid
  Imogine ijimai (Yeri and Kaburaki, 1918) -- valid
  Imogine izuensis (Kato, 1944) -- valid
  Imogine kimae Jennings and Newman, 1996 -- valid
  Imogine lateotentare Lee, Beal and Johnston, 2005 -- valid
  Imogine lesteri Jennings and Newman, 1996 -- valid
  Imogine marmoreus (Bock, 1925) -- valid
  Imogine mcgrathi Jennings and Newman, 1996 -- valid
  Imogine mediterranea (Galleni, 1976) -- valid
  Imogine megalops (Schmarda, 1859) -- valid
  Imogine meganae Jennings and Newman, 1996 -- valid
  Imogine melihertani Bulnes, 2010 -- valid
  Imogine minimus (Palombi, 1940) -- valid
  Imogine miyadii (Kato, 1944) -- valid
  Imogine nebulosus (Girard, 1853) -- valid
  Imogine necopinata Sluys, Faubel, Rajagopal and van der Velde, 2005 -- valid
  Imogine oculifera Girard, 1853 -- valid
  Imogine oculifera Verrill, 1892 -- invalid
  Imogine orientalis (Bock, 1913) -- valid
  Imogine orientalis australis Bock, 1913 -- valid
  Imogine orientalis orientalis (Bock, 1913) -- valid
  Imogine orientalis splendida (Bock, 1913) -- valid
  Imogine orientalis superbus de Beauchamp, 1961 -- valid
  Imogine pardalotus Jennings and Newman, 1996 -- valid
  Imogine pulcher (Hyman, 1940) -- valid
  Imogine qeshmensis Maghsoudlou and Momtazi, 2014 -- valid
  Imogine refertus (Du Bois-Reymond Marcus, 1965) -- valid
  Imogine rutilis (Yeri and Kaburaki, 1918) -- valid
  Imogine sixteni (Marcus, 1947) -- valid
  Imogine speciosus (Kato, 1937) -- valid
  Imogine ticus (Marcus, 1952) -- valid
  Imogine tripartitus (Hyman, 1953) -- valid
  Imogine truncata Schmarda, 1859 -- invalid
  Imogine uniporus (Kato, 1944) -- valid
  Imogine zebra (Verrill, 1882) -- valid
  Inaloa Martens and Curini-Galletti, 1994 -- valid
  Inaloa cirrifera (Meixner, 1943) -- valid
  Inaloa scalopura (Marcus, 1949) -- valid
  Incapora Du Bois-Reymond Marcus, 1953 -- valid
  Incapora anamallensis (de Beauchamp, 1930) -- valid
  Incapora weyrauchi Du Bois-Reymond Marcus, 1953 -- valid
  Indiplana Stummer-Traunfels, 1933 -- valid
  Indiplana oosora (Schmarda, 1859) -- valid
  Indistylochus Hyman, 1955 -- invalid
  Indistylochus hewatti Hyman, 1955 -- invalid
  Inframacrostomum Ferguson, 1954 -- invalid
  Inframacrostomum rubrocinctum (Ax, 1951) -- invalid
  Interplana Faubel, 1983 -- valid
  Interplana evelinae (Marcus, 1952) -- valid
  Interplana sandiegensis (Boone, 1929) -- valid
  Interplana sandiegiensis (Boone, 1929) -- invalid
  Invenusta Sopott-Ehlers, 1976 -- valid
  Invenusta aestus Sopott-Ehlers, 1976 -- valid
  Invenusta paracnida (Karling, 1967) -- valid
  Isodiametra Hooge and Tyler, 2005 -- valid
  Isodiametra bajaensis Hooge and Eppinger, 2005 -- valid
  Isodiametra colorata (Ehlers and Dörjes, 1979) -- valid
  Isodiametra cuernos Hooge and Tyler, 2008 -- valid
  Isodiametra divae (Marcus, 1950) -- valid
  Isodiametra earnhardti (Hooge and Smith, 2004) -- valid
  Isodiametra finkei Kċnneby and Jondelius, 2013 -- valid
  Isodiametra helgolandica (Dörjes, 1968) -- valid
  Isodiametra hortulus (Hooge and Tyler, 2003) -- valid
  Isodiametra karpredi (Hooge and Tyler, 2003) -- valid
  Isodiametra marginalis (Ivanov, 1952) -- valid
  Isodiametra nicki Hooge and Tyler, 2008 -- valid
  Isodiametra norvegica (Westblad, 1946) -- valid
  Isodiametra pulchra (Smith and Bush, 1991) -- valid
  Isodiametra urua (Marcus, 1954) -- valid
  Isodiametra variomorpha (Dörjes, 1968) -- valid
  Isodiametra vexillaria (Marcus, 1948) -- valid
  Isodiametra westbladi (Marcus, 1949) -- valid
  Isodiametridae Hooge and Tyler, 2005 -- valid
  Issoca C. G. Froehlich, 1955 -- valid
  Issoca jandaia C. G. Froehlich, 1955 -- valid
  Issoca piranga C. G. Froehlich, 1955 -- valid
  Issoca potyra C. G. Froehlich, 1957 -- valid
  Issoca rezendei (Schirch, 1929) -- valid
  Issoca spatulata (Graff, 1899) -- valid
  Itaipusa Marcus, 1949 -- valid
  Itaipusa acerosa (Brunet, 1972) -- valid
  Itaipusa aculeata (Ax, 1959) -- invalid
  Itaipusa biglandula Reygel, Willems and Artois, 2011 -- valid
  Itaipusa bispina Karling, 1980 -- valid
  Itaipusa curvicirra Karling, 1980 -- valid
  Itaipusa divae Marcus, 1949 -- valid
  Itaipusa evelinae (Marcus, 1954) -- valid
  Itaipusa karlingi Mack-Fira, 1968 -- valid
  Itaipusa renei Reygel, Willems and Artois, 2011 -- valid
  Itaipusa riegeri Karling, 1978 -- valid
  Itaipusa ruffinjonesi Karling, 1978 -- valid
  Itaipusa scotica (Karling, 1954) -- valid
  Itaipusa similis (Brunet, 1972) -- valid
  Itaipusa sophiae (Graff, 1905) -- valid
  Itaipusa spinibursa Karling, 1978 -- valid
  Itaipusa variodentata (Karling, Mack-Fira and Dörjes, 1972) -- valid
  Itaipusina Karling, 1980 -- valid
  Itaipusina graefei Karling, 1980 -- valid
  Itannia Marcus, 1947 -- valid
  Itannia ornata Marcus, 1947 -- valid
  Itannia ornata murna Du Bois-Reymond Marcus, 1957 -- valid
  Itannia ornata ornata Marcus, 1947 -- valid
  Itaspiella Ax, 1956 -- valid
  Itaspiella armata (Ax, 1951) -- invalid
  Itaspiella armata magna Ax and Ax, 1967 -- invalid
  Itaspiella bodegae Karling, 1964 -- valid
  Itaspiella bursituba Karling, 1964 -- valid
  Itaspiella helgolandica (Meixner, 1938) -- valid
  Itaspiella helgolandica helgolandica (Meixner, 1938) -- valid
  Itaspiella helgolandica magna Ax and Ax, 1967 -- valid
  Itaspiella macrostilifera Tajika, 1984 -- valid
  Itaspiella parana Noreña, Damborenea and Brusa, 2005 -- valid
  Itaspis Marcus, 1952 -- valid
  Itaspis evelinae Marcus, 1952 -- valid
  Izmira Bulnes, 2010 -- valid
  Izmira cinari Bulnes, 2010 -- valid
  Izmira turkeyi Bulnes, 2010 -- valid
  Japanoplana Ax, 1994 -- valid
  Japanoplana insolita Ax, 1994 -- valid
  Jensenia Graff, 1882 -- valid
  Jensenia agilis (Fuhrmann, 1900) -- invalid
  Jensenia angulata (Jensen, 1878) -- valid
  Jensenia intermedia (Du Plessis, 1879) -- invalid
  Jensenia lewisi Jones and Ferguson, 1948 -- invalid
  Jensenia luetjohanni Ax, 1952 -- invalid
  Jensenia macropharynx Meixner, 1938 -- invalid
  Jensenia millportiana (Graff, 1882) -- invalid
  Jensenia obscura (Plotnikow, 1905) -- invalid
  Jensenia oculifera de Beauchamp, 1927 -- invalid
  Jensenia parangulata Ax and Armonies, 1990 -- valid
  Jensenia quadrioculata (Vejdovsky, 1895) -- invalid
  Jensenia serotina (Dorner, 1902) -- invalid
  Jensenia truncata (Abildgaard, 1789) -- invalid
  Jordania Sekera, 1912 -- invalid
  Jordania stolzi Sekera, 1912 -- invalid
  Jovanella An der Lan, 1939 -- valid
  Jovanella balcanica An der Lan, 1939 -- valid
  Jugatovaria Sluys and Ball, 1989 -- valid
  Jugatovaria polynesiana Sluys and Cannon, 1989 -- valid
  Jugatovaria spinosa Sluys and Ball, 1989 -- valid
  Kaburakia Bock, 1925 -- valid
  Kaburakia excelsa Bock, 1925 -- valid
  Kaburakia gloriosa Kato, 1938 -- invalid
  Kaburakia oceanica (Hyman, 1955) -- valid
  Kaitalugia Willems, Artois, Backeljau and Schockaert, 2005 -- valid
  Kaitalugia falcata Willems, Artois, Backeljau and Schockaert, 2005 -- valid
  Kaitalugia lydieae Willems, Artois, Backeljau and Schockaert, 2005 -- valid
  Kalyla Marcus, 1951 -- valid
  Kalyla gabriellae Marcus, 1951 -- valid
  Kalyla hyalina (Karling, 1962) -- invalid
  Kalyla semicirculifera (Karling, 1962) -- invalid
  Kalyptorhynchia Graff, 1905 -- invalid
  Kambanella Steinböck, 1931 -- valid
  Kambanella agilis Steinböck, 1931 -- valid
  Karkinorhynchidae Meixner, 1928 -- valid
  Karkinorhynchides Schilke, 1970 -- valid
  Karkinorhynchides megalopharynx (L'Hardy, 1966) -- invalid
  Karkinorhynchides purpureus (Schilke, 1970) -- valid
  Karkinorhynchides tetragnathus (Ax and Schilke, 1971) -- invalid
  Karkinorhynchus Meixner, 1928 -- valid
  Karkinorhynchus (Karkinorhynchides) Schilke, 1970 -- invalid
  Karkinorhynchus (Karkinorhynchus) Schilke, 1970 -- invalid
  Karkinorhynchus bruneti Schilke, 1970 -- valid
  Karkinorhynchus coecus Meixner, 1938 -- invalid
  Karkinorhynchus lhardyi Schilke, 1970 -- valid
  Karkinorhynchus listensis Schilke, 1970 -- valid
  Karkinorhynchus megalopharynx L'Hardy, 1966 -- invalid
  Karkinorhynchus primitivus Meixner, 1928 -- valid
  Karkinorhynchus purpureus Schilke, 1970 -- invalid
  Karkinorhynchus tetragnathus Ax and Schilke, 1971 -- invalid
  Karlingia Ferguson, 1954 -- valid
  Karlingia lutheri (Marcus, 1948) -- valid
  Karlingiinae Rieger, 1971 -- valid
  Kata Marcus, 1949 -- valid
  Kata evelinae Marcus, 1949 -- valid
  Kata galapagoensis Ax and Ax, 1974 -- valid
  Kata galea Ax and Sopott-Ehlers, 1987 -- valid
  Kata leroda Marcus, 1950 -- valid
  Kataplana Ax, 1956 -- valid
  Kataplana arcuata Sopott-Ehlers, 1976 -- valid
  Kataplana celeretrix Bursey, Smith and Litviatis, 2012 -- valid
  Kataplana germanica (Meixner, 1938) -- valid
  Kataplana mesopharynx Ax, 1956 -- valid
  Kataria Faubel, 1983 -- valid
  Kataria gloriosa (Kato, 1938) -- valid
  Katheurylepta Faubel, 1984 -- valid
  Katheurylepta susakiensis (Kato, 1934) -- valid
  Kawanabella Timoshkin, 2004 -- valid
  Kawanabella afanasyevae Timoshkin, 2004 -- valid
  Kenkia Hyman, 1937 -- valid
  Kenkia glandulosa (Hyman, 1956) -- valid
  Kenkia hoffmasteri (Hyman, 1954) -- invalid
  Kenkia lewisi (Kenk, 1975) -- valid
  Kenkia rhynchida Hyman, 1937 -- valid
  Kenkiidae Hyman, 1937 -- valid
  Kenkiinae Hyman, 1937 -- invalid
  Kirgisella Beklemischev, 1927 -- valid
  Kirgisella forcipata Beklemischev, 1927 -- valid
  Kirgisellinae Luther, 1962 -- valid
  Klattia Kepner, Stirewalt and Ferguson, 1939 -- invalid
  Klattia virginiensis Kepner, Stirewalt and Ferguson, 1939 -- invalid
  Koinocystella Karling, 1952 -- valid
  Koinocystella inermis Karling, 1952 -- valid
  Koinocystididae Meixner, 1924 -- valid
  Koinocystis Meixner, 1924 -- valid
  Koinocystis dolichocephalus (Pereyaslawzewa, 1892) -- invalid
  Koinocystis fluvialis (Sibiriakova, 1929) -- valid
  Koinocystis fluviatus (Sibiriakova, 1929) -- invalid
  Koinocystis heinckei (Attems, 1897) -- invalid
  Koinocystis lacustris Meixner, 1926 -- valid
  Koinocystis neocomensis (Fuhrmann, 1904) -- valid
  Koinocystis relicta Beklemischev, 1927 -- invalid
  Koinocystis sophiae (Graff, 1905) -- invalid
  Koinocystis spinosa Beklemischev, 1927 -- invalid
  Koinocystis taeniophoris Steinböck, 1933 -- valid
  Koinocystis tvaerminnensis Karling, 1931 -- invalid
  Koinostylochus Faubel, 1983 -- valid
  Koinostylochus burchami (Heath and McGregor, 1912) -- valid
  Koinostylochus elongatus (Kato, 1937) -- valid
  Koinostylochus fulvus (Yeri and Kaburaki, 1918) -- valid
  Koinostylochus longipenis (Kato, 1937) -- valid
  Koinostylochus meridialis (Kato, 1938) -- valid
  Koinostylochus notoensis (Kato, 1944) -- valid
  Koinostylochus ostreophagus (Hyman, 1955) -- valid
  Koinostylochus siamensis (Palombi, 1923) -- valid
  Koinostylochus stimpsoni (Kato, 1937) -- valid
  Koinostylochus takeshitai (Yeri and Kaburaki, 1918) -- valid
  Kontikia C. G. Froehlich, 1955 -- valid
  Kontikia (Kontikia) C. G. Froehlich, 1955 -- valid
  Kontikia (Laubenfelsia) Ogren, Kawakatsu and E. M. Froehlich, 1993 -- valid
  Kontikia andersoni Jones, 1981 -- valid
  Kontikia ashleyi (Fyfe, 1953) -- valid
  Kontikia assimilis (Graff, 1899) -- valid
  Kontikia bulbosa Sluys, 1983 -- valid
  Kontikia canaliculata (Graff, 1899) -- valid
  Kontikia circularis (Fyfe, 1956) -- valid
  Kontikia cookiana (Schröder, 1924) -- valid
  Kontikia cyanea (Fyfe, 1956) -- valid
  Kontikia forsterorum (Schröder, 1924) -- valid
  Kontikia insularis (Prudhoe, 1949) -- valid
  Kontikia kenneli (Graff, 1899) -- valid
  Kontikia kewense (Moseley, 1878) -- invalid
  Kontikia korotneffi (Graff, 1899) -- invalid
  Kontikia marrineri (Dendy, 1910) -- invalid
  Kontikia mexicana (Hyman, 1939) -- invalid
  Kontikia micholitzi (Graff, 1899) -- invalid
  Kontikia nasuta (Loman, 1890) -- valid
  Kontikia orana C. G. Froehlich, 1955 -- valid
  Kontikia pelewensis (Graff, 1899) -- valid
  Kontikia quadrilineata (Haslauer-Gamisch, 1982) -- valid
  Kontikia ranuii (Fyfe, 1953) -- valid
  Kontikia renschi (Haslauer-Gamisch, 1982) -- valid
  Kontikia traversii (Moseley, 1877) -- valid
  Kontikia ventrolineata (Dendy, 1892) -- valid
  Kontikia whartoni (Gulliver, 1879) -- valid
  Kronborgia Christensen and Kanneworff, 1964 -- valid
  Kronborgia amphipodicola Christensen and Kanneworff, 1964 -- valid
  Kronborgia caridicola Kanneworff and Christensen, 1966 -- valid
  Kronborgia isopodicola Blair and Williams, 1987 -- valid
  Kronborgia pugettensis Shinn and Christensen, 1985 -- valid
  Kronborgia spiralis (Baylis, 1949) -- valid
  Krumbachia Reisinger, 1924 -- valid
  Krumbachia appendiculata Schwank, 1980 -- valid
  Krumbachia exigua (Dorner, 1902) -- valid
  Krumbachia guttulata Schwank, 1980 -- valid
  Krumbachia hiemalis Schwank, 1979 -- valid
  Krumbachia hungarica (Gelei, 1904) -- valid
  Krumbachia microbursalis Kolasa, 1981 -- valid
  Krumbachia minuta Ruebush, 1938 -- valid
  Krumbachia opaca (Nasonov, 1923) -- invalid
  Krumbachia opisthoformis (Nasonov, 1924) -- invalid
  Krumbachia palmeni (Nasonov, 1917) -- invalid
  Krumbachia palmeni rhynchocephala (Beklemischev, 1921) -- invalid
  Krumbachia paludicola Schwank, 1979 -- valid
  Krumbachia styriaca Reisinger, 1924 -- valid
  Krumbachia subterranea Reisinger, 1933 -- valid
  Krumbachia virginiana (Kepner and Carter, 1931) -- valid
  Krumbachia virginiana glandulosa (Ruebush, 1935) -- valid
  Krumbachia virginiana virginiana (Kepner and Carter, 1931) -- valid
  Kuma Marcus, 1950 -- valid
  Kuma albiventer (Marcus, 1954) -- valid
  Kuma asilhas Hooge and Rocha, 2006 -- valid
  Kuma belca Marcus, 1952 -- valid
  Kuma blacki Hooge and Tyler, 2008 -- valid
  Kuma brevicauda Marcus, 1950 -- valid
  Kuma flava Hooge and Smith, 2004 -- valid
  Kuma monogonophora (Westblad, 1946) -- valid
  Kuma viridis (An der Lan, 1936) -- valid
  Kylosphaera Jensen, 1878 -- invalid
  Kylosphaera armata Jensen, 1878 -- invalid
  Kymocarens Ehlers and Ehlers, 1981 -- valid
  Kymocarens kanakorum Willems, Artois, Backeljau and Schockaert, 2005 -- valid
  Kymocarens proxenetoides Ehlers and Ehlers, 1981 -- valid
  Kymocarens tibialis Ehlers and Ehlers, 1981 -- valid
  Kytorhynchella Rieger, 1974 -- valid
  Kytorhynchella karlingi Rieger, 1974 -- valid
  Kytorhynchella meixneri Rieger, 1974 -- valid
  Kytorhynchella riedli Rieger, 1974 -- valid
  Kytorhynchidae Rieger, 1974 -- valid
  Kytorhynchus Rieger, 1974 -- valid
  Kytorhynchus (Eukytorhynchus) Boyko, 1996 -- valid
  Kytorhynchus (Kytorhynchoides) Rieger, 1974 -- valid
  Kytorhynchus (Kytorhynchus) Rieger, 1974 -- valid
  Kytorhynchus macrostylus Rieger, 1974 -- valid
  Kytorhynchus microstylus Rieger, 1974 -- valid
  Kytorhynchus oculatus Rieger, 1974 -- valid
  Kytorynchidarum Schockaert and Martens, 1985 -- invalid
  Lagenopolycystis Artois and Schockaert, 2000 -- valid
  Lagenopolycystis peresi (Brunet, 1965) -- valid
  Lagenorhynchus Brunet, 1965 -- invalid
  Lagenorhynchus peresi Brunet, 1965 -- invalid
  Laidlawia Herzig, 1905 -- valid
  Laidlawia polygenia Palombi, 1938 -- valid
  Laidlawia trigonoporus Herzig, 1905 -- valid
  Laidlawiana Prudhoe, 1985 -- invalid
  Laidlawiana penangensis (Laidlaw, 1903) -- invalid
  Laidlawiidae Herzig, 1905 -- valid
  Laidlawiinae Herzig, 1905 -- invalid
  Lamelliposthia Steinböck, 1932 -- invalid
  Lamelliposthia rubromaculata Steinböck and Lanser, 1932 -- invalid
  Langia Czerniavsky, 1881 -- invalid
  Langia parasitica Czerniavsky, 1881 -- invalid
  Latocestidae Laidlaw, 1903 -- valid
  Latocestinae Laidlaw, 1903 -- valid
  Latocestus Plehn, 1896 -- valid
  Latocestus argus Laidlaw, 1903 -- valid
  Latocestus atlanticus Plehn, 1896 -- invalid
  Latocestus brasiliensis Hyman, 1955 -- valid
  Latocestus callizona (Marcus, 1947) -- valid
  Latocestus caribbeanus Prudhoe, 1944 -- invalid
  Latocestus galapagensis Hyman, 1953 -- invalid
  Latocestus maldivensis (Laidlaw, 1902) -- valid
  Latocestus marginatus Meixner, 1907 -- valid
  Latocestus mexicana (Hyman, 1953) -- valid
  Latocestus ocellatus Marcus, 1947 -- invalid
  Latocestus pacificus Laidlaw, 1903 -- invalid
  Latocestus plehni Laidlaw, 1906 -- valid
  Latocestus viridis Bock, 1913 -- valid
  Latocestus whartoni (Pearse, 1938) -- valid
  Latoplana Faubel, 1983 -- valid
  Latoplana levis (Hyman, 1953) -- valid
  Lauraplana Miller and Faubel, 2003 -- valid
  Lauraplana arrawarrensis Miller and Faubel, 2003 -- valid
  Lecithoepitheliata Reisinger, 1924 -- invalid
  Leguta Karling, 1980 -- valid
  Leguta chelifera (Karling, 1954) -- valid
  Lehardyia Karling, 1983 -- valid
  Lehardyia alleithoros Whitson, Smith and Litvaitis, 2011 -- valid
  Lehardyia megalopharynx (L'Hardy, 1966) -- valid
  Lehardyia tetragnatha (Ax and Schilke, 1971) -- valid
  Lehardyia trisulca Noldt, 1986 -- invalid
  Leimacopsidae Diesing, 1861 -- invalid
  Leimacopsis Diesing, 1862 -- invalid
  Leimacopsis terricola (Schmarda, 1859) -- invalid
  Lekanorhynchus Meixner, 1938 -- valid
  Lekanorhynchus remanei Meixner, 1938 -- valid
  Lenkunya Winsor, 1991 -- valid
  Lenkunya adae (Dendy, 1891) -- valid
  Lenkunya adae adae (Dendy, 1891) -- valid
  Lenkunya adae extralineata (Dendy, 1892) -- valid
  Lenkunya adae fusca (Dendy, 1894) -- valid
  Lenkunya arenicola (Steel, 1901) -- valid
  Lenkunya frosti (Spencer, 1891) -- valid
  Lenkunya munda (Fletcher and Hamilton, 1888) -- invalid
  Lenkunya ornata (Fletcher and Hamilton, 1888) -- valid
  Lenkunya virgata (Fletcher and Hamilton, 1888) -- valid
  Lenopharynginae Ehlers, 1972 -- valid
  Lenopharynx Beklemischev, 1929 -- valid
  Lenopharynx bathos Willems, Sandberg and Jondelius, 2007 -- valid
  Lenopharynx languidus Beklemischev, 1929 -- valid
  Lenopharynx triops Marcus, 1951 -- valid
  Lenopharynx tubatus Schockaert and Martens, 1985 -- valid
  Leptocera Jacubowa, 1906 -- invalid
  Leptocera delicata Jacubowa, 1906 -- invalid
  Leptoplana Ehrenberg, 1831 -- valid
  Leptoplana acticola Boone, 1929 -- invalid
  Leptoplana acuta Stimpson, 1855 -- valid
  Leptoplana affinis (Stimpson, 1857) -- invalid
  Leptoplana alba Lang in Schmidtlein, 1880 -- invalid
  Leptoplana alba Kelaart, 1858 -- invalid
  Leptoplana alcinoi Schmidt, 1861 -- invalid
  Leptoplana angusta Pearse, 1938 -- invalid
  Leptoplana angusta Pearse and Littler, 1938 -- invalid
  Leptoplana angusta Verrill, 1893 -- invalid
  Leptoplana arcta (Quatrefage, 1845) -- invalid
  Leptoplana atomata (O. F. Müller, 1776) -- invalid
  Leptoplana aurantiaca Collingwood, 1876 -- invalid
  Leptoplana australis Laidlaw, 1904 -- invalid
  Leptoplana australis (Schmarda, 1859) -- invalid
  Leptoplana bacteoalba Palombi, 1939 -- invalid
  Leptoplana badia (Stimpson, 1855) -- invalid
  Leptoplana brunnea Cheeseman, 1882 -- valid
  Leptoplana californica Plehn, 1898 -- invalid
  Leptoplana capensis (Schmarda, 1859) -- valid
  Leptoplana cherchiae Plehn, 1896 -- invalid
  Leptoplana chierchiae Plehn, 1896 -- invalid
  Leptoplana chilensis Schmarda, 1859 -- invalid
  Leptoplana chloranota (Boone, 1929) -- invalid
  Leptoplana collaris Stimpson, 1855 -- invalid
  Leptoplana concolor Meixner, 1907 -- invalid
  Leptoplana constipata (Stimpson, 1857) -- invalid
  Leptoplana crassiuscula (Stimpson, 1857) -- invalid
  Leptoplana cribraria (Stimpson, 1857) -- invalid
  Leptoplana delicatula Stimpson, 1857 -- valid
  Leptoplana diaphana Stummer-Traunfels, 1933 -- valid
  Leptoplana discus (Le Conte, 1851) -- valid
  Leptoplana droebachensis Ĝrsted, 1845 -- invalid
  Leptoplana drowbachensis Hyman, 1940 -- invalid
  Leptoplana dubia (Schmarda, 1859) -- invalid
  Leptoplana ellipsis (Dalyell, 1853) -- invalid
  Leptoplana ellipsoides Girard in Stimpson, 1854 -- invalid
  Leptoplana elongata (Quatrefage, 1845) -- invalid
  Leptoplana erythrotaenia (Schmarda, 1859) -- invalid
  Leptoplana fallax (Quatrefage, 1845) -- invalid
  Leptoplana ferruginea (Schmarda, 1859) -- invalid
  Leptoplana flexilis (Dalyell, 1814) -- invalid
  Leptoplana folium Verrill, 1873 -- invalid
  Leptoplana formosa (Darwin, 1844) -- valid
  Leptoplana fulva (Kelaart, 1858) -- valid
  Leptoplana fusca Stimpson, 1857 -- valid
  Leptoplana gardineri Laidlaw, 1904 -- invalid
  Leptoplana genicotyla (Palombi, 1939) -- invalid
  Leptoplana gigas Schmarda, 1859 -- invalid
  Leptoplana gracilis (Girard, 1850) -- invalid
  Leptoplana graffii Laidlaw, 1906 -- invalid
  Leptoplana grandis (Stimpson, 1857) -- invalid
  Leptoplana haloglena (Schmarda, 1859) -- invalid
  Leptoplana hamata (Schmidt, 1861) -- invalid
  Leptoplana humilis Stimpson, 1857 -- invalid
  Leptoplana hyalina Ehrenberg, 1831 -- valid
  Leptoplana inconspicua (Pease, 1860) -- valid
  Leptoplana inquieta Heath and McGregor, 1912 -- invalid
  Leptoplana irrorata (Pease, 1860) -- valid
  Leptoplana jaltensis (Czerniavsky, 1881) -- invalid
  Leptoplana kuekenthalli Plehn, 1896 -- invalid
  Leptoplana kukenthali Plehn, 1896 -- invalid
  Leptoplana lactea (Stimpson, 1857) -- invalid
  Leptoplana lacteoalba Verrill, 1900 -- invalid
  Leptoplana lactoalba Verrill, 1900 -- invalid
  Leptoplana lactoalba tincta Verrill, 1901 -- invalid
  Leptoplana lanceolata Schmarda, 1859 -- invalid
  Leptoplana levigata (Quatrefage, 1845) -- invalid
  Leptoplana lichenoides (Mertens, 1833) -- invalid
  Leptoplana limnoriae Hyman, 1953 -- invalid
  Leptoplana littoralis Morgan, 1905 -- valid
  Leptoplana lutea Ĝrsted, 1844 -- invalid
  Leptoplana luteola (Delle Chiaje, 1822) -- invalid
  Leptoplana lyrosora (Schmarda, 1859) -- invalid
  Leptoplana macrorhyncha (Schmarda, 1859) -- invalid
  Leptoplana macrosora Schmarda, 1859 -- valid
  Leptoplana maculosa Stimpson, 1857 -- valid
  Leptoplana malayana Laidlaw, 1903 -- invalid
  Leptoplana mertensii (Claparède, 1861) -- valid
  Leptoplana microsora (Schmarda, 1859) -- invalid
  Leptoplana modesta (Quatrefage, 1845) -- invalid
  Leptoplana monosora Schmarda, 1859 -- invalid
  Leptoplana moseleyi Lang, 1884 -- valid
  Leptoplana nadiae Melouk, 1941 -- invalid
  Leptoplana nationalis Plehn, 1896 -- invalid
  Leptoplana nigripunctata Ĝrsted, 1844 -- valid
  Leptoplana notabilis (Darwin, 1844) -- valid
  Leptoplana oblonga Stimpson, 1857 -- valid
  Leptoplana obovata (Schmarda, 1859) -- invalid
  Leptoplana obscura Stimpson, 1855 -- invalid
  Leptoplana obtusum (Collingwood, 1876) -- valid
  Leptoplana oosora (Schmarda, 1859) -- invalid
  Leptoplana ophryoglena (Schmarda, 1859) -- valid
  Leptoplana orbicularis (Schmarda, 1859) -- invalid
  Leptoplana otophora Schmarda, 1859 -- invalid
  Leptoplana pacificola Plehn, 1896 -- invalid
  Leptoplana pallida (Quatrefage, 1845) -- invalid
  Leptoplana panamensis Plehn, 1896 -- invalid
  Leptoplana pardalis Laidlaw, 1902 -- invalid
  Leptoplana patellarum Stimpson, 1855 -- invalid
  Leptoplana patellensis Collingwood, 1876 -- invalid
  Leptoplana pellucida Grube, 1840 -- invalid
  Leptoplana polycyclia (Schmarda, 1859) -- valid
  Leptoplana polysora (Schmarda, 1859) -- invalid
  Leptoplana punctata Stimpson, 1857 -- valid
  Leptoplana punctata (Kelaart, 1858) -- invalid
  Leptoplana purpurea Schmarda, 1859 -- invalid
  Leptoplana rupicola Heath and McGregor, 1912 -- invalid
  Leptoplana saxicola Heath and McGregor, 1912 -- invalid
  Leptoplana schizoporellae Hallez, 1893 -- valid
  Leptoplana schoenbornii Stimpson, 1857 -- valid
  Leptoplana schonbornii Stimpson, 1857 -- invalid
  Leptoplana sciophila Boone, 1929 -- invalid
  Leptoplana sparsa Stimpson, 1855 -- invalid
  Leptoplana stimpsoni Diesing, 1862 -- invalid
  Leptoplana striata Schmarda, 1859 -- valid
  Leptoplana subauriculata (Johnston, 1836) -- invalid
  Leptoplana subviridis Plehn, 1896 -- invalid
  Leptoplana suteri Jacubowa, 1906 -- invalid
  Leptoplana taenia (Schmarda, 1859) -- valid
  Leptoplana tenebrosa (Stimpson, 1857) -- valid
  Leptoplana tenella (Stimpson, 1857) -- valid
  Leptoplana tigrina (Blanchard, 1847) -- invalid
  Leptoplana timida Heath and McGregor, 1912 -- invalid
  Leptoplana trapezoglena (Schmarda, 1859) -- valid
  Leptoplana tremellaris (O. F. Müller, 1773) -- valid
  Leptoplana tremellaris mediterranea Bock, 1913 -- valid
  Leptoplana tremellaris taurica Jacubowa, 1909 -- invalid
  Leptoplana tremellaris tremellaris (O. F. Müller, 1773) -- valid
  Leptoplana trullaeformis Stimpson, 1855 -- valid
  Leptoplana tuba Grube, 1871 -- invalid
  Leptoplana variabilis (Girard, 1850) -- invalid
  Leptoplana vesiculata Hyman, 1939 -- valid
  Leptoplana virilis Verrill, 1893 -- invalid
  Leptoplana vitrea Lang, 1884 -- invalid
  Leptoplanella Faubel, 1983 -- valid
  Leptoplanella californica (Woodworth, 1894) -- valid
  Leptoplanidae Stimpson, 1857 -- valid
  Leptoplaninae Stimpson, 1857 -- invalid
  Leptoplanoidea Stimpson, 1857 -- valid
  Leptostylochus Bock, 1925 -- valid
  Leptostylochus capensis Palombi, 1938 -- valid
  Leptostylochus elongatus Bock, 1925 -- valid
  Leptostylochus gracilis Kato, 1934 -- valid
  Leptostylochus novacambrensis Hyman, 1959 -- valid
  Leptostylochus ovatus Kato, 1937 -- invalid
  Leptostylochus pacificus (Kato, 1943) -- valid
  Leptostylochus palombii Faubel, 1983 -- valid
  Leptostylochus polysorus (Schmarda, 1859) -- valid
  Leptoteredra Hallez, 1913 -- valid
  Leptoteredra maculata (Hallez, 1905) -- valid
  Leptoteredra stylostomoides (Gemmill and Leiper, 1907) -- invalid
  Leptoteredra tentaculata Kato, 1943 -- valid
  Leucolesma Marcus, 1948 -- valid
  Leucolesma corderoi Marcus, 1948 -- valid
  Leucon Uljanin, 1870 -- invalid
  Leucon ornata Graff, 1882 -- invalid
  Leucon ovatus Uljanin, 1870 -- invalid
  Leuconoplana Leuckart, 1871 -- invalid
  Leuconoplana ornatus (Uljanin, 1870) -- invalid
  Leuconoplana ovatus (Uljanin, 1870) -- invalid
  Liana E. M. Froehlich, 1978 -- valid
  Liana guasa E. M. Froehlich, 1978 -- valid
  Licheniplana Heath and McGregor, 1912 -- invalid
  Licheniplana lepida Heath and McGregor, 1912 -- invalid
  Limipolycystis Schilke, 1970 -- valid
  Limipolycystis curvitubo Schilke, 1970 -- valid
  Limipolycystis falx Artois, Willems and Schockaert, 2012 -- valid
  Limipolycystis friedae Artois, Willems and Schockaert, 2012 -- valid
  Limipolycystis libra Artois, Willems and Schockaert, 2012 -- valid
  Limipolycystis sicilicula Artois, Willems and Schockaert, 2012 -- valid
  Limipolycystis swedmarki Karling, 1978 -- invalid
  Limipolycystis wallbergi Artois, Willems and Schockaert, 2012 -- valid
  Limirhynchus Schilke, 1970 -- valid
  Limirhynchus curvitubo (Schilke, 1970) -- invalid
  Limirhynchus danicus Schilke, 1970 -- valid
  Limnoplana Faubel, 1983 -- valid
  Limnoplana amara (Kaburaki, 1918) -- valid
  Limnoplana annardalei (Kaburaki, 1918) -- valid
  Limnoposthia Faubel and Kolasa, 1978 -- valid
  Limnoposthia polonica (Kolasa and Faubel, 1974) -- valid
  Limnoruanis Kolasa, 1977 -- valid
  Limnoruanis romanae Kolasa, 1977 -- valid
  Limnostylochidae Faubel, 1983 -- valid
  Limnostylochus Bock, 1913 -- valid
  Limnostylochus amara (Kaburaki, 1918) -- invalid
  Limnostylochus annandalei (Kaburaki, 1918) -- invalid
  Limnostylochus annardalei (Kaburaki, 1918) -- invalid
  Limnostylochus borneensis (Stummer-Traunfels, 1902) -- valid
  Limnotyphloplanida Van Steenkiste, Tessens, Willems, Backeljau, Jondelius and Artois, 2013 -- invalid
  Linella Timoshkin, 2004 -- valid
  Linella leontyevae Timoshkin, 2004 -- valid
  Linella livanovi (Timoshkin, 1986) -- valid
  Linella macrorhynchus (Timoshkin, 1986) -- valid
  Linguabana Rundell and Leander, 2014 -- invalid
  Linguabana tulai Rundell and Leander, 2014 -- invalid
  Lioniella Riedl, 1954 -- valid
  Lioniella petiti Riedl, 1954 -- valid
  Listea Ax and Heller, 1970 -- valid
  Listea paradoxa Ax, 1959 -- invalid
  Listea simplex Ax and Heller, 1970 -- valid
  Lithophora Steinböck, 1925 -- invalid
  Litucivis Ax and Heller, 1970 -- valid
  Litucivis serpens Ax and Heller, 1970 -- valid
  Lonchoplanella Ehlers, 1974 -- valid
  Lonchoplanella axi Ehlers, 1974 -- valid
  Longiprostatum Hyman, 1953 -- valid
  Longiprostatum rickettsi Hyman, 1953 -- valid
  Lophorhynchus Hällström and Luther in Luther, 1907 -- invalid
  Lophorhynchus turgida (Zacharias, 1902) -- invalid
  Loutfia Khalil and Azim, 1937 -- invalid
  Loutfia loutfia Khalil and Azim, 1937 -- invalid
  Ludmila Uljanin, 1870 -- invalid
  Ludmila graciosus Uljanin, 1870 -- invalid
  Luriculus Faubel, Rohde and Watson, 1994 -- valid
  Luriculus australiensis Faubel, Rohde and Watson, 1994 -- valid
  Luriculus castor (Sterrer and Rieger, 1990) -- valid
  Luriculus minos (Sterrer, 1992) -- valid
  Luriculus tyndareus (Sterrer and Rieger, 1990) -- valid
  Luridae Sterrer and Rieger, 1990 -- valid
  Lurus Marcus, 1950 -- valid
  Lurus castor Sterrer and Rieger, 1990 -- invalid
  Lurus evelinae Marcus, 1950 -- valid
  Lurus minos Sterrer, 1992 -- invalid
  Lurus pollux Sterrer and Rieger, 1990 -- valid
  Lurus tyndareus Sterrer and Rieger, 1990 -- invalid
  Lurymare Marcus and Marcus, 1968 -- valid
  Lurymare clavocapitata Marquina, Teresa Aguado and Noreña, 2015 -- valid
  Lurymare delicatum (Palombi, 1939) -- invalid
  Lurymare drygalskii (Bock, 1931) -- valid
  Lurymare gabriellae (Marcus, 1949) -- invalid
  Lurymare katoi (Poulter, 1975) -- valid
  Lurymare matarazzoi (Marcus, 1950) -- invalid
  Lurymare monosorum (Schmarda, 1859) -- valid
  Lurymare purum (Kato, 1937) -- invalid
  Lurymare russoi (Palombi, 1939) -- invalid
  Lurymare singulare (Laidlaw, 1904) -- valid
  Lurymare utarum (Marcus, 1952) -- invalid
  Luteostriata Carbayo, 2010 -- valid
  Luteostriata abundans (Graff, 1899) -- valid
  Luteostriata arturi (Lemos and Leal-Zanchet, 2008) -- valid
  Luteostriata caissara (E. M. Froehlich, 1955) -- valid
  Luteostriata ceciliae (E. M. Froehlich and Leal-Zanchet, 2003) -- valid
  Luteostriata ernesti (Leal-Zanchet and E. M. Froehlich, 2006) -- valid
  Luteostriata fita (C. G. Froehlich, 1959) -- valid
  Luteostriata graffi (Leal-Zanchet and E. M. Froehlich, 2006) -- valid
  Luteostriata muelleri (Diesing, 1861) -- valid
  Luteostriata pseudoceciliae (Lemos and Leal-Zanchet, 2008) -- valid
  Lutheria Hofsten, 1907 -- valid
  Lutheria gallica de Beauchamp, 1948 -- invalid
  Lutheria interstitialis Lanfranchi and Papi, 1978 -- valid
  Lutheria minuta Hofsten, 1907 -- valid
  Lutheria minuta interstitialis Lanfranchi and Papi, 1978 -- invalid
  Lutheria moroderi (Gieysztor, 1931) -- valid
  Lutheriella Hartog, 1966 -- valid
  Lutheriella diplostyla Hartog, 1966 -- valid
  Mabelaplana Bulnes, Faubel and Ponce de Leon, 2003 -- valid
  Mabelaplana santateresae Bulnes, Faubel and Ponce de Leon, 2003 -- valid
  Macginitiella Hyman, 1953 -- valid
  Macginitiella delmaris Hyman, 1953 -- valid
  Macroatrium Riser, 1981 -- valid
  Macroatrium serosum Riser, 1981 -- valid
  Macrocotyla Hyman, 1956 -- invalid
  Macrocotyla glandularis Hyman, 1956 -- invalid
  Macrocotyla glandulosa Hyman, 1956 -- invalid
  Macrocotyla hoffmasteri (Hyman, 1954) -- invalid
  Macrocotyla lewisi Kenk, 1975 -- invalid
  Macrogynium Meserve, 1934 -- valid
  Macrogynium ovalis Meserve, 1934 -- valid
  Macrophysaliophora Reisinger, 1924 -- valid
  Macrophysaliophora inconstans Reisinger, 1924 -- valid
  Macrorhynchinae Evdonin, 1977 -- invalid
  Macrorhynchus Graff, 1882 -- valid
  Macrorhynchus assimilis (Levinsen, 1879) -- invalid
  Macrorhynchus bivittatus Pereyaslawzewa, 1892 -- invalid
  Macrorhynchus bivittatus (Uljanin, 1870) -- invalid
  Macrorhynchus coeruleus Fuhrmann, 1898 -- invalid
  Macrorhynchus croceus (Fabricius, 1826) -- valid
  Macrorhynchus dolichocephalus (Pereyaslawzewa, 1892) -- invalid
  Macrorhynchus goetti (Bresslau, 1906) -- invalid
  Macrorhynchus groenlandicus (Levinsen, 1879) -- valid
  Macrorhynchus helgolandicus (Metschnikoff, 1865) -- invalid
  Macrorhynchus immundum (Schmidt, 1857) -- valid
  Macrorhynchus kefferstoni (Claparède, 1863) -- invalid
  Macrorhynchus lemanus (Forel and Du Plessis, 1874) -- invalid
  Macrorhynchus leucophraeus (Fabricius, 1826) -- invalid
  Macrorhynchus mamertinus (Graff, 1874) -- invalid
  Macrorhynchus manusferrea Artois and Schockaert, 2001 -- valid
  Macrorhynchus minutus (Uljanin, 1870) -- invalid
  Macrorhynchus naegelii (Kölliker, 1845) -- invalid
  Macrorhynchus papillatus (Mereschkowsky, 1878) -- invalid
  Macrorhynchus spiralis Pereyaslawzewa, 1892 -- invalid
  Macrostoma Ĝrsted, 1843 -- invalid
  Macrostomida Karling, 1940 -- valid
  Macrostomidae Beneden, 1870 -- valid
  Macrostomorpha Doe, 1986 -- invalid
  Macrostomum Schmidt, 1848 -- valid
  Macrostomum acus Wang, 2005 -- valid
  Macrostomum acutum Ax, 2008 -- valid
  Macrostomum aegyptium Beltagi, 1972 -- valid
  Macrostomum album Higley, 1918 -- invalid
  Macrostomum amaniense Young, 1976 -- valid
  Macrostomum amurense Beklemischev, 1950 -- valid
  Macrostomum anocele Riedel, 1932 -- invalid
  Macrostomum appendiculatum (Fabricius, 1826) -- valid
  Macrostomum appendiculatum Beklemischev, 1922 -- invalid
  Macrostomum appendiculatum Beklemischev, 1915 -- invalid
  Macrostomum appendiculatum brasiliensis Marcus, 1952 -- invalid
  Macrostomum appendiculatum distinguenda Papi, 1951 -- invalid
  Macrostomum appendiculatum finnlandensis Ferguson, 1940 -- invalid
  Macrostomum appendiculatum sensitivum Silliman, 1884 -- invalid
  Macrostomum appendiculatum sillimani Ferguson, 1939 -- invalid
  Macrostomum appendiculatum stirewalti Jones and Ferguson, 1941 -- invalid
  Macrostomum astericis Schmidt and Sopott-Ehlers, 1976 -- valid
  Macrostomum auriculatum Nasonov, 1935 -- valid
  Macrostomum auritum Schultze, 1851 -- invalid
  Macrostomum australiense Faubel, Blome and Cannon, 1994 -- valid
  Macrostomum axi Papi, 1959 -- valid
  Macrostomum balticum Luther, 1947 -- valid
  Macrostomum balticum balticum Luther, 1947 -- valid
  Macrostomum balticum meridionalis Papi, 1953 -- valid
  Macrostomum baringoense Young, 1976 -- valid
  Macrostomum beauchampi Ferguson, 1939 -- invalid
  Macrostomum beaufortensis Ferguson, 1937 -- invalid
  Macrostomum bellebaruchae Ax, 2008 -- valid
  Macrostomum bicaudatum Wang, Sun and Zhang, 2015 -- valid
  Macrostomum bicurvistyla Armonies and Hellwig, 1987 -- valid
  Macrostomum boreale Riedel, 1932 -- valid
  Macrostomum brevituba Armonies and Hellwig, 1987 -- valid
  Macrostomum bulbostylum Kepner and Stiff, 1932 -- invalid
  Macrostomum burti Ax and Armonies, 1987 -- valid
  Macrostomum cairoense Beltagi, 1972 -- valid
  Macrostomum calcaris Ax, 2008 -- valid
  Macrostomum caprariae Papi, 1959 -- valid
  Macrostomum carolinense Ferguson, 1940 -- valid
  Macrostomum catarractae Gieysztor, 1938 -- valid
  Macrostomum caudatum Uljanin, 1870 -- invalid
  Macrostomum ceylanicum Schmarda, 1859 -- valid
  Macrostomum christinae Young, 1976 -- valid
  Macrostomum claparedii Beneden, 1870 -- invalid
  Macrostomum clavistylum Beklemischev, 1951 -- valid
  Macrostomum clavituba Ax, 2008 -- valid
  Macrostomum collistylum Ferguson, 1939 -- valid
  Macrostomum contortum Beklemischev, 1951 -- valid
  Macrostomum coomerensis Faubel and Cameron, 2001 -- valid
  Macrostomum coxi Young, 1976 -- valid
  Macrostomum curvata Papi, 1951 -- valid
  Macrostomum curvistylum Ferguson, 1939 -- valid
  Macrostomum curvituba Luther, 1947 -- valid
  Macrostomum delphax Marcus, 1946 -- valid
  Macrostomum deltanensis Beltagi and El-Said, 2002 -- valid
  Macrostomum distinguenda Papi, 1951 -- invalid
  Macrostomum distinguendum Papi, 1951 -- valid
  Macrostomum dongyuanensis Wang and Sun, 2015 -- valid
  Macrostomum dorsiforum Beltagi, 1972 -- valid
  Macrostomum elgonense de Beauchamp, 1935 -- valid
  Macrostomum ensiferum Beklemischev, 1951 -- valid
  Macrostomum erinaceum Girard, 1893 -- invalid
  Macrostomum ermini Ax, 1959 -- valid
  Macrostomum evelinae Marcus, 1946 -- valid
  Macrostomum extraculum Ax and Armonies, 1990 -- valid
  Macrostomum fergussoni Beklemischev, 1951 -- valid
  Macrostomum finlandense elgonense de Beauchamp, 1935 -- invalid
  Macrostomum finnlandense Ferguson, 1940 -- valid
  Macrostomum flexum Ax, 2008 -- valid
  Macrostomum frigorophilum Ferguson, 1940 -- valid
  Macrostomum gabriellae Schmidt and Sopott-Ehlers, 1976 -- invalid
  Macrostomum gallicum Ax, 2008 -- valid
  Macrostomum galloprovinciale Schmidt and Sopott-Ehlers, 1976 -- valid
  Macrostomum georgeense Young, 1976 -- valid
  Macrostomum gieysztori Ferguson, 1939 -- invalid
  Macrostomum gigas Okugawa, 1930 -- invalid
  Macrostomum gilberti Ferguson, 1939 -- valid
  Macrostomum glochistylum Ferguson, 1939 -- valid
  Macrostomum glochostylum Ferguson, 1939 -- invalid
  Macrostomum glocostylum Ferguson, 1939 -- invalid
  Macrostomum goharii Beltagi, Ibrahim and Moustafa, 2000 -- valid
  Macrostomum gracile Pereyaslawzewa, 1892 -- valid
  Macrostomum gracile Gieysztor, 1931 -- invalid
  Macrostomum graffi Ferguson, 1939 -- valid
  Macrostomum granulophorum Ferguson, 1940 -- valid
  Macrostomum greenwoodi Faubel and Cameron, 2001 -- valid
  Macrostomum guttulatum Ax, 2008 -- valid
  Macrostomum hamatum Luther, 1947 -- valid
  Macrostomum heyuanensis Wang and Sun, 2015 -- valid
  Macrostomum hofsteni Rogozin, 2012 -- valid
  Macrostomum hustedi Jones, 1944 -- invalid
  Macrostomum hystricinum Beklemischev, 1951 -- valid
  Macrostomum hystricinum Chodorowski, 1959 -- invalid
  Macrostomum hystricinum hystricinum Beklemischev, 1951 -- valid
  Macrostomum hystricinum marinum Rieger, 1977 -- valid
  Macrostomum hystrix Ĝrsted, 1843 -- valid
  Macrostomum ideficis Schmidt and Sopott-Ehlers, 1976 -- valid
  Macrostomum incurvatum Ax, 2008 -- valid
  Macrostomum inductum Kolasa, 1971 -- valid
  Macrostomum inflatum Beklemischev, 1951 -- valid
  Macrostomum infundibuliferum Plotnikow, 1905 -- valid
  Macrostomum intermedium Tu, 1934 -- valid
  Macrostomum ismailiensis Beltagi, Ibrahim and Moustafa, 2001 -- valid
  Macrostomum japonicum Okugawa, 1930 -- valid
  Macrostomum japonicum quiritium Beklemischev, 1951 -- invalid
  Macrostomum johni Young, 1972 -- valid
  Macrostomum karlingi Papi, 1953 -- valid
  Macrostomum kawamurai Okugawa, 1930 -- invalid
  Macrostomum kepneri Ferguson and Jones, 1940 -- valid
  Macrostomum korsakovi Nasonov, 1921 -- valid
  Macrostomum lacustre Beklemischev, 1951 -- invalid
  Macrostomum leptos An der Lan, 1939 -- valid
  Macrostomum lewisi Ferguson, 1939 -- valid
  Macrostomum lignano Ladurner, Schärer, Salvenmoser and Rieger, 2005 -- valid
  Macrostomum lineare Uljanin, 1870 -- valid
  Macrostomum longistyliferum Ax, 1956 -- valid
  Macrostomum longituba Papi, 1953 -- valid
  Macrostomum lutheri Beklemischev, 1927 -- valid
  Macrostomum lutheri Gieysztor, 1930 -- invalid
  Macrostomum magnacurvituba Ax, 1994 -- valid
  Macrostomum majesticis Schmidt and Sopott-Ehlers, 1976 -- valid
  Macrostomum mediterraneum Ax, 1956 -- valid
  Macrostomum megalogastricum Pereyaslawzewa, 1892 -- valid
  Macrostomum minuta Luther, 1947 -- invalid
  Macrostomum minutum Luther, 1947 -- valid
  Macrostomum miraculicis Schmidt and Sopott-Ehlers, 1976 -- invalid
  Macrostomum mosquense Beklemischev, 1951 -- valid
  Macrostomum mystrophorum Meixner, 1926 -- valid
  Macrostomum nairobiense Young, 1976 -- valid
  Macrostomum nassonovi (Nasonov, 1921) -- valid
  Macrostomum niloticum Beltagi, 1972 -- valid
  Macrostomum norfolkensis Jones and Ferguson, 1940 -- valid
  Macrostomum obelicis Schmidt and Sopott-Ehlers, 1976 -- valid
  Macrostomum obtusa Wang, 2006 -- valid
  Macrostomum obtusum Vejdovsky, 1895 -- valid
  Macrostomum obtusum korsakovi Nasonov, 1926 -- invalid
  Macrostomum ontarioense Ferguson, 1943 -- valid
  Macrostomum ophiocephalum Steinböck, 1931 -- invalid
  Macrostomum orthostylum Braun, 1885 -- valid
  Macrostomum orthostylum curvata Papi, 1951 -- invalid
  Macrostomum orthostylum recurva Papi, 1951 -- invalid
  Macrostomum parmum Ball, 1977 -- valid
  Macrostomum parthenopeum Beklemischev, 1951 -- invalid
  Macrostomum peteraxi Mack-Fira, 1971 -- valid
  Macrostomum phillipsi Ferguson and Stirewalt, 1938 -- valid
  Macrostomum phocurum Marcus, 1954 -- valid
  Macrostomum phytophilum Beklemischev, 1951 -- invalid
  Macrostomum pithecusae Papi, 1959 -- valid
  Macrostomum platensis Adami, Damborenea and Ronderos, 2012 -- valid
  Macrostomum poznaniense Kolasa, 1973 -- valid
  Macrostomum prognosticis Schmidt and Sopott-Ehlers, 1976 -- valid
  Macrostomum pseudoobscurum Beklemischev, 1927 -- valid
  Macrostomum pseudoobtusum Beklemischev, 1927 -- invalid
  Macrostomum puntapiedrensis Brusa, 2006 -- valid
  Macrostomum purpureum Reisinger and Kelbetz, 1964 -- valid
  Macrostomum pusillum Ax, 1951 -- valid
  Macrostomum quiritium Beklemischev, 1951 -- valid
  Macrostomum rectum Ax, 2008 -- valid
  Macrostomum recurvostylum Ferguson, 1940 -- valid
  Macrostomum retortum Papi, 1951 -- valid
  Macrostomum reynoldsi Ferguson, 1939 -- valid
  Macrostomum reynoldsoni Young, 1976 -- valid
  Macrostomum rhabdophorum Beklemischev, 1927 -- valid
  Macrostomum riedeli Ferguson, 1940 -- valid
  Macrostomum romanicum Mack-Fira, 1968 -- valid
  Macrostomum rossicum Beklemischev, 1951 -- invalid
  Macrostomum rostratum Papi, 1951 -- valid
  Macrostomum rubrocinctum Ax, 1951 -- valid
  Macrostomum ruebushi Ferguson, 1940 -- valid
  Macrostomum ruebushi carolinensis Ferguson, 1940 -- invalid
  Macrostomum ruebushi crenatostylum Ferguson, 1940 -- valid
  Macrostomum ruebushi finnlandensis Ferguson, 1940 -- invalid
  Macrostomum ruebushi frigorophilum Ferguson, 1940 -- invalid
  Macrostomum ruebushi granulophorum Ferguson, 1940 -- invalid
  Macrostomum ruebushi kepneri Ferguson and Jones, 1940 -- invalid
  Macrostomum ruebushi recurvostylum Ferguson, 1940 -- invalid
  Macrostomum ruebushi ruebushi Ferguson, 1940 -- valid
  Macrostomum ruebushi schmitti Hayes and Ferguson, 1940 -- invalid
  Macrostomum ruebushi shenandoahensis Ferguson, 1940 -- invalid
  Macrostomum ruebushi truncatum Ferguson, 1940 -- invalid
  Macrostomum saifunicum Nasonov, 1929 -- valid
  Macrostomum salemensis Beltagi and El-Said, 2003 -- valid
  Macrostomum salinum Ax and Borkott, 1968 -- invalid
  Macrostomum schmitti Hayes and Ferguson, 1940 -- valid
  Macrostomum schultzii Claparède, 1863 -- invalid
  Macrostomum scrobiculariae Villot, 1878 -- invalid
  Macrostomum semicirculatum Ax, 2008 -- valid
  Macrostomum sensitivum Silliman, 1884 -- valid
  Macrostomum setosum Schmarda, 1859 -- invalid
  Macrostomum shenandoahense Ferguson, 1940 -- valid
  Macrostomum silesiacum Kolasa, 1973 -- valid
  Macrostomum sinensis Wang, 2005 -- valid
  Macrostomum sinyaense Young, 1976 -- valid
  Macrostomum siphonophorum (Schmidt, 1852) -- invalid
  Macrostomum spirale Ax, 1956 -- invalid
  Macrostomum spirale Schulz and Meyer, 1939 -- invalid
  Macrostomum stepposus Rogozin, 2012 -- valid
  Macrostomum stylopensillum Jones, 1939 -- valid
  Macrostomum subterraneum Rixen, 1961 -- valid
  Macrostomum tennesseense Ferguson, 1940 -- valid
  Macrostomum tenuicauda Luther, 1947 -- valid
  Macrostomum thermale Reisinger, 1933 -- valid
  Macrostomum thermophilum Riedel, 1932 -- invalid
  Macrostomum thingithuense Young, 1976 -- valid
  Macrostomum timavi Graff, 1905 -- valid
  Macrostomum troubadicus Schmidt and Sopott-Ehlers, 1976 -- valid
  Macrostomum truncatum Ferguson, 1940 -- valid
  Macrostomum tuba Graff, 1882 -- valid
  Macrostomum tuba bulbostylum Ferguson and Jones, 1940 -- invalid
  Macrostomum tuba gigas Okugawa, 1930 -- invalid
  Macrostomum tuba minuta Luther, 1947 -- invalid
  Macrostomum tuba tuba Graff, 1882 -- valid
  Macrostomum tuba verbekei Marcus and Du Bois-Reymond Marcus, 1957 -- valid
  Macrostomum tubum Graff, 1882 -- invalid
  Macrostomum uncinatum Ax, 2008 -- valid
  Macrostomum vejdovski Ferguson and Jones, 1940 -- invalid
  Macrostomum vejdovskyi Ferguson, 1940 -- valid
  Macrostomum velastylum Brusa, 2006 -- valid
  Macrostomum ventriflavum Pereyaslawzewa, 1892 -- invalid
  Macrostomum virginianum Ferguson, 1937 -- valid
  Macrostomum viride Beneden, 1870 -- valid
  Macrostomum viride elgonense de Beauchamp, 1935 -- invalid
  Macrostomum viride rostrata Papi, 1951 -- invalid
  Macrostomum xiamensis Wang and Luo, 2004 -- valid
  Maehrenthalia Graff, 1905 -- valid
  Maehrenthalia agilis (Levinsen, 1879) -- valid
  Maehrenthalia americana Ax and Armonies, 1990 -- valid
  Maehrenthalia caligulachaena Ehlers and Ehlers, 1981 -- invalid
  Maehrenthalia coeca Luther, 1948 -- invalid
  Maehrenthalia delamarei Ax, 1956 -- invalid
  Maehrenthalia dubia Ax, 1956 -- invalid
  Maehrenthalia intermedia (Graff, 1882) -- invalid
  Maehrenthalia lutheri Marcus, 1952 -- invalid
  Maehrenthalia simplex Ax, 1959 -- invalid
  Maehrenthalia uncinata Ax, 1959 -- invalid
  Maehrenthaliella Karling, 1985 -- valid
  Maehrenthaliella intermedia (Graff, 1882) -- valid
  Magnetia Hochberg and Cannon, 2003 -- valid
  Magnetia queenslandica Hochberg and Cannon, 2003 -- valid
  Mahurubia Willems, Artois, Vermin, Backeljau and Schockaert, 2005 -- valid
  Mahurubia clava Willems, Artois, Vermin, Backeljau and Schockaert, 2005 -- valid
  Maiazoon Newman and Cannon, 1996 -- invalid
  Maiazoon orsaki Newman and Cannon, 1996 -- invalid
  Marcomesostoma Janssen and Faubel, 1992 -- valid
  Marcomesostoma evelinae (Marcus, 1955) -- valid
  Marcusella Westblad, 1953 -- invalid
  Marcusella atriovillosa Westblad, 1953 -- invalid
  Marcusella dendrastorum (Stunkard and Corliss, 1951) -- invalid
  Marcusella pallida Hickman, 1956 -- invalid
  Marcusia Artois and Schockaert, 1998 -- invalid
  Marcusia Hyman, 1953 -- valid
  Marcusia ernesti Hyman, 1953 -- valid
  Marcusia yagana (Marcus, 1954) -- invalid
  Marcusiola Steinböck, 1966 -- valid
  Marcusiola tinga (Du Bois-Reymond Marcus, 1957) -- valid
  Mariareuterella Timoshkin and Grygier, 2005 -- valid
  Mariareuterella baeckmanae (Timoshkin, 1986) -- valid
  Mariareuterella grygieri (Timoshkin, 2004) -- valid
  Mariareuterella kasteri (Timoshkin, 2004) -- valid
  Mariareuterella lyudmilae (Timoshkin, 2004) -- valid
  Mariareuterella martensi (Timoshkin, 2004) -- valid
  Mariareuterella mazepovae (Timoshkin, 2004) -- valid
  Mariareuterella nigmatullini (Timoshkin, 2004) -- valid
  Mariareuterella nikitinae (Timoshkin, 2004) -- valid
  Mariareuterella pleschinskayae (Timoshkin, 2004) -- valid
  Mariareuterella sabirovi (Timoshkin, 2004) -- valid
  Mariareuterella saetosouncinata (Timoshkin, 2004) -- valid
  Mariareuterella salemaai (Timoshkin, 2004) -- valid
  Mariareuterella schetinnikovi (Timoshkin, 2004) -- valid
  Maricola Hallez, 1892 -- invalid
  Marinellia Riedl, 1954 -- invalid
  Marinellia lingulifera Riedl, 1954 -- invalid
  Mariplanella Ax and Heller, 1970 -- valid
  Mariplanella frisia Ax and Heller, 1970 -- valid
  Mariplanellinae Ax and Heller, 1970 -- valid
  Marirhynchus Schilke, 1970 -- valid
  Marirhynchus longasaeta Schilke, 1970 -- valid
  Maritigrella Newman and Cannon, 2000 -- valid
  Maritigrella aureolineatus (Verrill, 1901) -- valid
  Maritigrella crozieri (Hyman, 1939) -- valid
  Maritigrella eschara Newman and Cannon, 2000 -- valid
  Maritigrella fuscopunctata (Prudhoe, 1978) -- valid
  Maritigrella makranica Maghsoudlou and Rahimian, 2014 -- valid
  Maritigrella marygarsonae Newman and Cannon, 2000 -- valid
  Maritigrella newmanae Bolaños, Quiroga and Litvaitis, 2007 -- valid
  Maritigrella ocellata Newman and Cannon, 2000 -- valid
  Maritigrella stellata Newman and Cannon, 2000 -- valid
  Maritigrella virgulata Newman and Cannon, 2000 -- valid
  Matuxia Carbayo, Alvarez-Presas, Olivares, Marques, E. M. Froehlich and Riutort, 2013 -- valid
  Matuxia matuta (E. M. Froehlich, 1955) -- valid
  Matuxia tuxaua (E. M. Froehlich, 1955) -- valid
  Meara Westblad, 1949 -- valid
  Meara stichopi Westblad, 1949 -- valid
  Mecynostomidae Dörjes, 1968 -- valid
  Mecynostomum Beneden, 1870 -- valid
  Mecynostomum agile Jensen, 1878 -- invalid
  Mecynostomum arenarium Ax, 1959 -- invalid
  Mecynostomum auritum (Schultze, 1851) -- valid
  Mecynostomum auritum flavescens (Westblad, 1946) -- invalid
  Mecynostomum auritum glandulosum (Westblad, 1946) -- invalid
  Mecynostomum auritum typica (Westblad, 1946) -- invalid
  Mecynostomum bathycola Westblad, 1948 -- invalid
  Mecynostomum caudatum (Uljanin, 1870) -- valid
  Mecynostomum cordiforme Levinsen, 1879 -- invalid
  Mecynostomum daenum Marcus, 1954 -- invalid
  Mecynostomum evelinae Marcus, 1948 -- invalid
  Mecynostomum filiferum Ax, 1963 -- valid
  Mecynostomum haplovarium Dörjes, 1968 -- valid
  Mecynostomum idium Marcus, 1954 -- invalid
  Mecynostomum lentiferum Levinsen, 1879 -- invalid
  Mecynostomum lutheri (Westblad, 1946) -- invalid
  Mecynostomum macrobursalium (Westblad, 1946) -- invalid
  Mecynostomum macrospiriferum (Westblad, 1946) -- invalid
  Mecynostomum minimum (Westblad, 1946) -- invalid
  Mecynostomum pallidum (Beklemischev, 1915) -- invalid
  Mecynostomum pellitum Marcus, 1951 -- invalid
  Mecynostomum predatum Faubel, 1976 -- valid
  Mecynostomum pulchellum (Uljanin, 1870) -- invalid
  Mecynostomum rhomboides (Westblad, 1946) -- invalid
  Mecynostomum sanguineum (Beklemischev, 1915) -- invalid
  Mecynostomum sizilianum Riedl, 1954 -- invalid
  Mecynostomum tenuissimum (Westblad, 1946) -- invalid
  Mecynostomum torquens Kozloff, 2000 -- valid
  Mediofusata Kornakova and Joffe, 1999 -- invalid
  Megaloascos Evdonin, 1970 -- valid
  Megaloascos psammophilum Evdonin, 1970 -- valid
  Megamorion Rieger and Sterrer, 1968 -- valid
  Megamorion brevicauda Rieger and Sterrer, 1968 -- valid
  Megastomum Schmarda, 1859 -- invalid
  Megastomum ferrugineum Schmarda, 1859 -- invalid
  Meidiama Marcus, 1946 -- valid
  Meidiama lutheri Marcus, 1946 -- valid
  Meidiama schockaerti Martens and Curini-Galletti, 1993 -- valid
  Meidiama uruguayensis Schockaert, Curini-Galletti, De Ridder, Volonterio and Artois, 2009 -- valid
  Meidiamidae Schockaert, Curini-Galletti, De Ridder, Volonterio and Artois, 2009 -- valid
  Meiocheta Rieger, 1971 -- valid
  Meiocheta spiralis (Ax, 1952) -- valid
  Meixneria Bock, 1913 -- valid
  Meixneria furva Bock, 1913 -- valid
  Meixnerides Westblad, 1952 -- valid
  Meixnerides armatus Westblad, 1952 -- valid
  Meixnerididae Westblad, 1952 -- valid
  Meixueria de Beauchamp, 1961 -- invalid
  Melloplana Faubel, 1983 -- valid
  Melloplana ferruginea (Schmarda, 1859) -- valid
  Melloplana japonica (Kato, 1937) -- valid
  Memyla Marcus, 1952 -- valid
  Memyla phocanella Marcus, 1952 -- valid
  Mesocastrada Volz, 1898 -- valid
  Mesocastrada fuhrmanni Volz, 1898 -- valid
  Mesocastrada iberiensis Noreña, Campo and Real, 1999 -- valid
  Mesocela Jacubowa, 1906 -- valid
  Mesocela caledonica Jacubowa, 1906 -- valid
  Mesoda Marcus, 1949 -- valid
  Mesoda Faubel, 1983 -- invalid
  Mesoda gabriellae Marcus, 1949 -- valid
  Mesoda septentrionalis Sopott, 1972 -- invalid
  Mesoda thelura (Marcus, 1951) -- valid
  Mesodiscus Minot, 1877 -- invalid
  Mesodiscus inversiporus Minot, 1877 -- invalid
  Mesophaenocora Noreña, Brusa, Ponce de Leon and Damborenea, 2005 -- valid
  Mesophaenocora polyova Noreña, Brusa, Ponce de Leon and Damborenea, 2005 -- valid
  Mesophaenocorinae Noreña, Brusa, Ponce de Leon and Damborenea, 2005 -- valid
  Mesopharynx Schmarda, 1859 -- invalid
  Mesopharynx diglena Schmarda, 1859 -- invalid
  Mesopharynx otophorus Schmarda, 1859 -- invalid
  Mesoplana Crezee, 1976 -- invalid
  Mesorhynchus Karling, 1956 -- valid
  Mesorhynchus terminostylis Karling, 1956 -- valid
  Mesostoma Ehrenberg, 1837 -- valid
  Mesostoma africanum Kolasa, 1976 -- valid
  Mesostoma agile Levinsen, 1879 -- invalid
  Mesostoma ajpetri Nasonov, 1924 -- invalid
  Mesostoma andicola (Schmarda, 1859) -- valid
  Mesostoma andrewsi Hyman, 1957 -- invalid
  Mesostoma angulare Higley, 1918 -- valid
  Mesostoma antarcticum Dreyer, 1918 -- valid
  Mesostoma appia Kolasa, 1984 -- invalid
  Mesostoma appinum Kolasa and Schwartz, 1988 -- valid
  Mesostoma arctica Hyman, 1938 -- valid
  Mesostoma armatum Fuhrmann, 1894 -- invalid
  Mesostoma armeniacium Plotnikow, 1906 -- invalid
  Mesostoma aselli Kennel, 1898 -- invalid
  Mesostoma balatonicum Szigethy, 1897 -- valid
  Mesostoma banaticum Graff, 1875 -- invalid
  Mesostoma bifidum McIntosh, 1874 -- invalid
  Mesostoma bistrigatum Diesing, 1850 -- valid
  Mesostoma bologoviense Plotnikow, 1906 -- invalid
  Mesostoma brincki Marcus, 1970 -- valid
  Mesostoma californicum Hyman, 1957 -- valid
  Mesostoma canum Weiss, 1909 -- valid
  Mesostoma chlorosticum Schmidt, 1857 -- invalid
  Mesostoma chromobactrium Braun, 1885 -- invalid
  Mesostoma chusholensis Ruebush, 1939 -- valid
  Mesostoma climenti Nasonov, 1924 -- valid
  Mesostoma coecum Silliman, 1884 -- invalid
  Mesostoma columbianum Hyman, 1939 -- valid
  Mesostoma craci Schmidt, 1857 -- valid
  Mesostoma cuenoti Dörler, 1900 -- valid
  Mesostoma curvipenis Hyman, 1955 -- valid
  Mesostoma cyathus Schmidt, 1858 -- invalid
  Mesostoma cycloposthe Dorner, 1902 -- invalid
  Mesostoma echinatus Uljanin, 1870 -- invalid
  Mesostoma ehrenbergii (Focke, 1836) -- valid
  Mesostoma ehrenbergii quadrangularis (Focke, 1836) -- invalid
  Mesostoma ehrenbergii wardii Husted and Ruebush, 1940 -- invalid
  Mesostoma ellipticum Uljanin, 1870 -- invalid
  Mesostoma ensifer Uljanin, 1870 -- invalid
  Mesostoma evelinae Marcus, 1955 -- invalid
  Mesostoma ewerum Du Bois-Reymond Marcus, 1951 -- valid
  Mesostoma exigua Dorner, 1902 -- invalid
  Mesostoma extremeniensis Noreña, Campo and Real, 1999 -- valid
  Mesostoma fallax Schmidt, 1858 -- invalid
  Mesostoma flabelliferum Levinsen, 1879 -- invalid
  Mesostoma flavida Graff, 1882 -- invalid
  Mesostoma fusiforma (A. L. Dugès, 1830) -- invalid
  Mesostoma georgianum Darlington, 1959 -- valid
  Mesostoma gonocephalum Silliman, 1884 -- invalid
  Mesostoma gracile (Schmarda, 1859) -- invalid
  Mesostoma graffi Mereschkowsky, 1878 -- invalid
  Mesostoma griseum (O. F. Müller, 1789) -- invalid
  Mesostoma grossum (O. F. Müller, 1774) -- invalid
  Mesostoma hallezianum Vejdovsky, 1880 -- invalid
  Mesostoma hartmeyer Weiss, 1910 -- valid
  Mesostoma herclotsiannum de Man, 1874 -- invalid
  Mesostoma hirudo Schmidt, 1858 -- valid
  Mesostoma hirudo Sekera, 1889 -- invalid
  Mesostoma inversum de Beauchamp, 1954 -- invalid
  Mesostoma karrooense Dreyer, 1915 -- valid
  Mesostoma lacteum Neppi, 1904 -- invalid
  Mesostoma lanceola Braun, 1885 -- invalid
  Mesostoma lapponicum Schmidt, 1852 -- invalid
  Mesostoma lenticulata Schmidt, 1852 -- invalid
  Mesostoma lingua (Abildgaard, 1789) -- valid
  Mesostoma lingua Schmidt, 1848 -- invalid
  Mesostoma lingua baoensis Ruebush, 1939 -- valid
  Mesostoma lingua cyathus Sekera, 1889 -- valid
  Mesostoma lingua lacustris Brinkmann, 1906 -- valid
  Mesostoma lingua lingua (Abildgaard, 1789) -- valid
  Mesostoma lingua typica Brinkmann, 1906 -- valid
  Mesostoma lugdunense de Man, 1874 -- invalid
  Mesostoma macropenis Hyman, 1939 -- valid
  Mesostoma macroprostatum Hyman, 1939 -- valid
  Mesostoma maculatum Hofsten, 1916 -- valid
  Mesostoma magnum Kolasa and Schwartz, 1988 -- valid
  Mesostoma marmoratum Schultze, 1851 -- invalid
  Mesostoma marmoratum groenlandica Levinsen, 1879 -- invalid
  Mesostoma masovicum Dorner, 1902 -- valid
  Mesostoma metopoglena (Schmarda, 1859) -- valid
  Mesostoma michaelseni Weiss, 1909 -- valid
  Mesostoma minimum Fuhrmann, 1894 -- invalid
  Mesostoma montanum Graff, 1875 -- invalid
  Mesostoma morgiense Du Plessis, 1876 -- invalid
  Mesostoma murmanicum Nasonov, 1923 -- valid
  Mesostoma mutabile Böhmig, 1902 -- valid
  Mesostoma nassanoffii Graff, 1882 -- invalid
  Mesostoma neapolitanum Graff, 1882 -- invalid
  Mesostoma nigrirostrum Braun, 1885 -- valid
  Mesostoma obtusum Schultze, 1851 -- invalid
  Mesostoma orabiensis Beltagi and El-Said, 2004 -- valid
  Mesostoma oscari Graff, 1903 -- invalid
  Mesostoma ovoideum Schmidt, 1852 -- invalid
  Mesostoma pattersoni Silliman, 1884 -- valid
  Mesostoma personatum Schmidt, 1848 -- invalid
  Mesostoma perspicua Fuhrmann, 1894 -- invalid
  Mesostoma platycephalum Braun, 1885 -- valid
  Mesostoma platygastricum Hofsten, 1924 -- valid
  Mesostoma pratense Schultze, 1851 -- invalid
  Mesostoma primitivum (Sabussow, 1929) -- valid
  Mesostoma productum (Schmidt, 1848) -- valid
  Mesostoma productum lanceolatum Gelei, 1933 -- valid
  Mesostoma productum productum (Schmidt, 1848) -- valid
  Mesostoma punctatum Braun, 1885 -- valid
  Mesostoma pusillum Schmidt, 1848 -- invalid
  Mesostoma radiatum (O. F. Müller, 1773) -- invalid
  Mesostoma raugeense Braun, 1885 -- valid
  Mesostoma rhynchotum Braun, 1885 -- valid
  Mesostoma robertsoni Graff, 1882 -- invalid
  Mesostoma rostratum Hallez, 1879 -- invalid
  Mesostoma rostratum (O. F. Müller, 1774) -- invalid
  Mesostoma segne Fuhrmann, 1894 -- invalid
  Mesostoma sensitivum Uljanin, 1870 -- invalid
  Mesostoma shebinensis Beltagi, Ibrahim and Moustafa, 2001 -- valid
  Mesostoma sibollae Kolasa, 1976 -- valid
  Mesostoma sigmoideum Plotnikow, 1905 -- invalid
  Mesostoma simplex Higley, 1918 -- invalid
  Mesostoma solea Schmidt, 1857 -- invalid
  Mesostoma sphaeropharynx (Schmarda, 1859) -- invalid
  Mesostoma splendida Graff, 1882 -- invalid
  Mesostoma stagni (Dalyell, 1853) -- valid
  Mesostoma stimulosum Graff, 1903 -- valid
  Mesostoma striatus Uljanin, 1870 -- invalid
  Mesostoma strigatum (O. F. Müller, 1773) -- invalid
  Mesostoma sulphureum (Schmidt, 1848) -- invalid
  Mesostoma tetragonum (O. F. Müller, 1774) -- valid
  Mesostoma tetragonum Schmidt, 1848 -- invalid
  Mesostoma thamagai Artois, Willems, De Roeck, Jocque and Brendonck, 2005 -- valid
  Mesostoma timbunka Kolasa, 1984 -- invalid
  Mesostoma togarmensis Ruebush, 1939 -- valid
  Mesostoma truncatum Graff, 1882 -- invalid
  Mesostoma truncula Schmidt, 1858 -- invalid
  Mesostoma tubiseminalis Smith, 1998 -- valid
  Mesostoma ucamara Noreña, Damborenea and Escobedo, 2006 -- valid
  Mesostoma uljanini Sabussow, 1900 -- invalid
  Mesostoma variabile Weismann, 1864 -- invalid
  Mesostoma vejdovskyi Jaworowski, 1895 -- invalid
  Mesostoma vernale Hyman, 1955 -- valid
  Mesostoma viaregginum Kolasa, 1976 -- valid
  Mesostoma violaceum Levinsen, 1879 -- invalid
  Mesostoma virginiana Kepner, Stirewalt and Ferguson, 1939 -- invalid
  Mesostoma viridatum (Abildgaard, 1789) -- invalid
  Mesostoma vittatus Ĝrsted, 1844 -- invalid
  Mesostoma vivipara Timoshkin, 1985 -- valid
  Mesostoma viviparum Silliman, 1884 -- invalid
  Mesostoma wandae Nasonov, 1877 -- invalid
  Mesostoma wandae Schmidt, 1858 -- invalid
  Mesostoma wanum Kolasa, 1984 -- invalid
  Mesostoma wardii Woodworth, 1896 -- invalid
  Mesostoma yungi Fuhrmann, 1900 -- invalid
  Mesostoma zariae Kolasa and Mead, 1981 -- valid
  Mesostominae Hyman, 1955 -- valid
  Mesostomum hystrix Schmarda, 1859 -- invalid
  Mesovortex An der Lan, 1939 -- invalid
  Mesovortex stankovici An der Lan, 1939 -- invalid
  Messoplana Hartog, 1966 -- valid
  Messoplana aremorica Ehlers and Sopott-Ehlers, 1989 -- valid
  Messoplana canariensis Ehlers and Ehlers, 1980 -- valid
  Messoplana elegans (Luther, 1948) -- valid
  Messoplana falcata (Ax, 1953) -- valid
  Messoplana falcata falcata (Ax, 1953) -- valid
  Messoplana falcata valida Ax, 1974 -- valid
  Messoplana floralis Ehlers, 1974 -- valid
  Messoplana geminata Hartog, 1966 -- valid
  Messoplana globulifera Artois, Vermin and Schockaert, 2000 -- valid
  Messoplana helgolandica Ax, 1971 -- valid
  Messoplana minuta Artois, Vermin and Schockaert, 2000 -- valid
  Messoplana pacifica Karling, 1986 -- valid
  Messoplana roscoffensis Ehlers, 1980 -- valid
  Messoplana rugata Ehlers, 1974 -- valid
  Messoplana spiralis Artois, Vermin and Schockaert, 2000 -- valid
  Metamesostoma Schubotz, 1922 -- valid
  Metamesostoma damariense Schubotz, 1922 -- valid
  Metaposthia Palombi, 1923 -- valid
  Metaposthia norfolkensis Palombi, 1923 -- valid
  Mexistylochus Hyman, 1953 -- invalid
  Mexistylochus levis Hyman, 1953 -- invalid
  Mexistylochus tuberculatus Hyman, 1953 -- invalid
  Miava Marcus, 1954 -- valid
  Miava ernesti Hyman, 1958 -- invalid
  Miava evelinae Marcus, 1954 -- valid
  Micaplana Kato, 1937 -- valid
  Micaplana misae Kato, 1937 -- valid
  Microarchicotylus Porfirieva and Timoshkin, 2015 -- valid
  Microarchicotylus elegans (Porfirieva, Timoshkin and Zaytseva, 2009) -- valid
  Microarchicotylus ochroleucus Porfirieva and Timoshkin, 2015 -- valid
  Microarchicotylus stringulatus (Korotneff, 1912) -- valid
  Microbothrium fragile Olsson, 1868 -- invalid
  Microcalyptorhynchus Kepner and Ruebush, 1935 -- valid
  Microcalyptorhynchus virginianus Kepner and Ruebush, 1935 -- valid
  Microcelis Plehn, 1899 -- invalid
  Microcelis schauinslandi Plehn, 1899 -- invalid
  Microdalyellia Gieysztor, 1938 -- valid
  Microdalyellia (Gieysztoria) Ruebush and Hayes, 1939 -- invalid
  Microdalyellia abursalis (Ruebush, 1937) -- valid
  Microdalyellia acariaia Marcus, 1946 -- invalid
  Microdalyellia arctica (Nasonov, 1923) -- valid
  Microdalyellia armigera (Schmidt, 1861) -- valid
  Microdalyellia armigera armigera (Schmidt, 1861) -- valid
  Microdalyellia armigera chaetifera (Nasonov, 1919) -- invalid
  Microdalyellia armigera microphthalma (Vejdovsky, 1895) -- valid
  Microdalyellia armigera scapulifera (Nasonov, 1919) -- invalid
  Microdalyellia armigera unguifera (Nasonov, 1920) -- invalid
  Microdalyellia armigera vinculosa (Szynal, 1933) -- valid
  Microdalyellia armygera (Schmidt, 1861) -- invalid
  Microdalyellia arndti Mead and Kolasa, 1984 -- valid
  Microdalyellia articulata (Graff, 1911) -- invalid
  Microdalyellia aspinosa (Szynal, 1932) -- invalid
  Microdalyellia bellis Marcus, 1946 -- invalid
  Microdalyellia beltrami (Gieysztor, 1931) -- invalid
  Microdalyellia benacensis (Steinböck, 1932) -- invalid
  Microdalyellia bergi (Beklemischev, 1927) -- invalid
  Microdalyellia bicornis (Nasonov, 1926) -- valid
  Microdalyellia bicoronaria (Fulinski, 1933) -- invalid
  Microdalyellia bipennata Noreña, Campo and Real, 1999 -- valid
  Microdalyellia biwae (Okugawa, 1930) -- valid
  Microdalyellia blodgetti (Silliman, 1884) -- invalid
  Microdalyellia brevimana (Beklemischev, 1921) -- valid
  Microdalyellia brevimana brevimana (Beklemischev, 1921) -- valid
  Microdalyellia brevimana nasonovi Gieysztor, 1938 -- valid
  Microdalyellia brevispina (Hofsten, 1907) -- valid
  Microdalyellia brevistyla (Eggers, 1925) -- invalid
  Microdalyellia chlynovica (Nasonov, 1919) -- invalid
  Microdalyellia circulobursalis (Ruebush, 1937) -- valid
  Microdalyellia complicata (Fuhrmann, 1914) -- invalid
  Microdalyellia cuspidata (Schmidt, 1861) -- invalid
  Microdalyellia cypris Marcus, 1946 -- invalid
  Microdalyellia dastychi Kolasa, 1981 -- valid
  Microdalyellia deses (Riedel, 1932) -- valid
  Microdalyellia diadema (Hofsten, 1907) -- invalid
  Microdalyellia dissimilis (Szynal, 1932) -- invalid
  Microdalyellia dodgei (Graff, 1911) -- invalid
  Microdalyellia dubitativa (Sibiriakova, 1929) -- valid
  Microdalyellia eastmani (Graff, 1911) -- invalid
  Microdalyellia erythrocephala (Steinböck, 1949) -- valid
  Microdalyellia euchroa (Gieysztor, 1926) -- invalid
  Microdalyellia evelinae Marcus, 1946 -- invalid
  Microdalyellia expedita (Hofsten, 1907) -- invalid
  Microdalyellia fairchildi (Graff, 1911) -- valid
  Microdalyellia fibrosa (Szynal, 1932) -- invalid
  Microdalyellia foreli (Hofsten, 1911) -- invalid
  Microdalyellia fulcrifera (Weise, 1942) -- valid
  Microdalyellia fusca (Fuhrmann, 1894) -- valid
  Microdalyellia fusca filifera (Nasonov, 1919) -- valid
  Microdalyellia fusca fusca (Fuhrmann, 1894) -- valid
  Microdalyellia gilesi Jones and Hayes, 1941 -- valid
  Microdalyellia graffi (Hallez, 1878) -- invalid
  Microdalyellia groenlandica (Riedel, 1932) -- valid
  Microdalyellia guangdongensis Wang and Rong, 2016 -- valid
  Microdalyellia henophora (Weise, 1942) -- valid
  Microdalyellia hunanensis Wang and Wu, 2008 -- valid
  Microdalyellia hymanae Marcus, 1946 -- invalid
  Microdalyellia incerta (Böhmig, 1902) -- valid
  Microdalyellia inflata (Okugawa, 1930) -- invalid
  Microdalyellia infundibuliformis (Fuhrmann, 1894) -- invalid
  Microdalyellia intricata Marcus, 1946 -- invalid
  Microdalyellia japonica (Okugawa, 1930) -- invalid
  Microdalyellia kenyae Young, 1977 -- valid
  Microdalyellia kessleri (Plotnikow, 1906) -- invalid
  Microdalyellia kharkowiensis (Markow, 1904) -- valid
  Microdalyellia knipovici Beklemischev, 1953 -- invalid
  Microdalyellia koiwi (Eggers, 1925) -- invalid
  Microdalyellia kupelwieseri (Meixner, 1915) -- valid
  Microdalyellia lugubris (Reisinger, 1924) -- invalid
  Microdalyellia lugubris wigrensis Gieysztor, 1938 -- invalid
  Microdalyellia lutheri (Nasonov, 1917) -- invalid
  Microdalyellia macrobursalis van der Land, 1965 -- valid
  Microdalyellia maialis Kolasa, 1979 -- valid
  Microdalyellia microphthalma (Vejdovsky, 1895) -- invalid
  Microdalyellia minima (An der Lan, 1939) -- valid
  Microdalyellia minima (Riedel, 1932) -- invalid
  Microdalyellia mohicana (Graff, 1911) -- valid
  Microdalyellia mollosovi (Nasonov, 1920) -- valid
  Microdalyellia multiovata (Luther, 1955) -- valid
  Microdalyellia muyuensis Wang and Wu, 2005 -- valid
  Microdalyellia nanella (Beklemischev, 1921) -- valid
  Microdalyellia nassonovi Beklemischev, 1950 -- invalid
  Microdalyellia ohlsoni Luther, 1955 -- valid
  Microdalyellia okugawai Ruebush and Hayes, 1939 -- invalid
  Microdalyellia ornata (Hofsten, 1907) -- invalid
  Microdalyellia oryzae (Nasonov, 1929) -- invalid
  Microdalyellia paucispinosa (Sekera, 1888) -- valid
  Microdalyellia pavimentata (Beklemischev, 1919) -- invalid
  Microdalyellia picta (Schmidt, 1848) -- valid
  Microdalyellia picta picta (Schmidt, 1848) -- valid
  Microdalyellia picta toutriensis (Fulinski and Szynal, 1933) -- valid
  Microdalyellia pugiofera (Weise, 1942) -- valid
  Microdalyellia quadridens (Böhmig, 1898) -- invalid
  Microdalyellia quadridensoides (Fuhrmann, 1914) -- invalid
  Microdalyellia rastafariae (Therriault and Kolasa, 1999) -- valid
  Microdalyellia rheesi (Graff, 1911) -- valid
  Microdalyellia rochesteriana (Graff, 1911) -- valid
  Microdalyellia rossi (Graff, 1911) -- valid
  Microdalyellia rossi karisalmica (Nasonov, 1917) -- valid
  Microdalyellia rossi maxima (Ruebush, 1937) -- valid
  Microdalyellia rossi minima (Ruebush, 1937) -- valid
  Microdalyellia rossi rossi (Graff, 1911) -- valid
  Microdalyellia rossi tennesseensis (Ruebush and Hayes, 1939) -- invalid
  Microdalyellia rossi virginiana (Ruebush, 1937) -- valid
  Microdalyellia rubra (Fuhrmann, 1894) -- invalid
  Microdalyellia ruebushi Luther, 1955 -- valid
  Microdalyellia sawayai Marcus, 1946 -- valid
  Microdalyellia schmidtii (Graff, 1882) -- valid
  Microdalyellia schockaerti Willems, Artois, Jocqué and Brendonck, 2007 -- valid
  Microdalyellia semispinosa (Fulinski and Szynal, 1927) -- invalid
  Microdalyellia shennongjiae Wang and Wu, 2005 -- valid
  Microdalyellia shenzhensis Wang and Wu, 2005 -- valid
  Microdalyellia sibirica (Plotnikow, 1905) -- invalid
  Microdalyellia sillimani (Graff, 1911) -- valid
  Microdalyellia sinensis Wang and Wu, 2005 -- valid
  Microdalyellia taurica (Nasonov, 1923) -- invalid
  Microdalyellia tennesseensis (Ruebush and Hayes, 1939) -- valid
  Microdalyellia therapaina Marcus, 1946 -- invalid
  Microdalyellia thienemanni (Reisinger, 1933) -- invalid
  Microdalyellia thymara Marcus, 1946 -- invalid
  Microdalyellia transilvana (Paradi, 1882) -- invalid
  Microdalyellia triangulata (Robeson, 1931) -- invalid
  Microdalyellia tridentata (Szynal, 1932) -- invalid
  Microdalyellia tridesma Marcus, 1946 -- invalid
  Microdalyellia triquetra (Fuhrmann, 1894) -- invalid
  Microdalyellia triseriata Beklemischev, 1950 -- valid
  Microdalyellia trisolena Marcus, 1946 -- invalid
  Microdalyellia tsurugae (Nasonov, 1929) -- valid
  Microdalyellia uncia (Marcus, 1946) -- invalid
  Microdalyellia variospinosa (Fulinski and Szynal, 1933) -- valid
  Microdalyellia vinculosa (Szynal, 1933) -- invalid
  Microdalyellia virginiana (Ruebush, 1937) -- invalid
  Microdalyellia virgulifer (Plotnikow, 1906) -- invalid
  Microdalyellia wiszniewskii Gieysztor, 1938 -- invalid
  Microdalyellia zykovi (Nasonov, 1919) -- invalid
  Micropalaeosoma Poinar, 2004 -- valid
  Micropalaeosoma balticus (Poinar, 2003) -- valid
  Micropharynx Jaegerskiold, 1896 -- valid
  Micropharynx murmanica Awerinzeir, 1925 -- valid
  Micropharynx parasitica Jaegerskiold, 1896 -- valid
  Microplana Vejdovsky, 1889 -- valid
  Microplana aberana (Mell, 1904) -- valid
  Microplana aixandrei Vila-Farré, Mateos, Sluys and Romero, 2008 -- valid
  Microplana albicollis (Graff, 1899) -- invalid
  Microplana atrocyanea (Walton, 1912) -- invalid
  Microplana atropurpurea (Graff, 1899) -- valid
  Microplana attemsi (Bendl, 1909) -- valid
  Microplana britannica (Percival, 1925) -- invalid
  Microplana carli (Fuhrmann, 1914) -- invalid
  Microplana ceylonica Graff, 1889 -- valid
  Microplana cherangani (de Beauchamp, 1936) -- valid
  Microplana cockerelli (Graff, 1899) -- invalid
  Microplana costaricensis (de Beauchamp, 1913) -- valid
  Microplana decenni (Battalgazi, 1945) -- invalid
  Microplana gadesensis Vila-Farré, Mateos, Sluys and Romero, 2008 -- valid
  Microplana garavi Du Bois-Reymond Marcus, 1957 -- valid
  Microplana gebavoeltzkowi Ogren and Kawakatsu, 1988 -- invalid
  Microplana giustii Minelli, 1976 -- valid
  Microplana graffi (Geba, 1909) -- valid
  Microplana grazalemica Vila-Farré, Mateos, Sluys and Romero, 2008 -- valid
  Microplana groga Jones, Webster, Littlewood and McDonald, 2008 -- valid
  Microplana haitiensis (Prudhoe, 1949) -- valid
  Microplana harea Marcus, 1953 -- valid
  Microplana henrici (Bendl, 1908) -- valid
  Microplana hovassei (de Beauchamp, 1934) -- valid
  Microplana howesi (Scharff, 1900) -- valid
  Microplana humicola Vejdovsky, 1889 -- valid
  Microplana hyalina Vila-Farré and Sluys, 2011 -- valid
  Microplana indica (Chaurasia, 1985) -- valid
  Microplana kwiskea Jones, Webster, Littlewood and McDonald, 2008 -- valid
  Microplana mahnerti Minelli, 1977 -- invalid
  Microplana mediostriata (Geba, 1909) -- valid
  Microplana monacensis (Heinzel, 1929) -- invalid
  Microplana montoyai (Fuhrmann, 1912) -- valid
  Microplana nana Mateos, Giribet and Carranza, 1998 -- valid
  Microplana natalensis (Jameson, 1907) -- valid
  Microplana neumanni (Mell, 1904) -- valid
  Microplana peneckei (Meixner, 1921) -- valid
  Microplana pereraca Marcus and Marcus, 1959 -- valid
  Microplana purpurea (Bendl, 1908) -- valid
  Microplana pyrenaica (Graff, 1893) -- invalid
  Microplana richardi (Bendl, 1909) -- invalid
  Microplana robusta Vila-Farré and Sluys, 2011 -- valid
  Microplana ruca Marcus, 1954 -- invalid
  Microplana rufocephalata Hyman, 1954 -- valid
  Microplana ruteocephala Kaburaki, 1922 -- invalid
  Microplana scharffi (Graff, 1899) -- valid
  Microplana styriaca (Freisling, 1935) -- invalid
  Microplana teres (Graff, 1899) -- invalid
  Microplana termitophaga Jones, Darlington and Newson, 1990 -- valid
  Microplana terrestris (O. F. Müller, 1773) -- valid
  Microplana tetracladea (Wilczynski, 1920) -- invalid
  Microplana thwaitesi (Moseley, 1874) -- invalid
  Microplana thwaitesii (Moseley, 1874) -- valid
  Microplana trifuscolineata (Kaburaki, 1920) -- valid
  Microplana tristriata (Geba, 1909) -- valid
  Microplana uniductus (de Beauchamp, 1930) -- valid
  Microplana unilineata (Frieb, 1923) -- valid
  Microplana viridis (Jameson, 1907) -- valid
  Microplana voeltzkowi (Graff, 1899) -- valid
  Microplana yaravi Du Bois-Reymond Marcus, 1957 -- valid
  Microplaninae Pantin, 1953 -- valid
  Microposthia Faubel, 1974 -- valid
  Microposthia listensis Faubel, 1974 -- valid
  Microrhynchus Kepner and Ruebush, 1935 -- invalid
  Microrhynchus virginianus Kepner and Ruebush, 1935 -- invalid
  Microstomidae Luther, 1907 -- valid
  Microstomum Schmidt, 1848 -- valid
  Microstomum achroophthalmum Diesing, 1862 -- valid
  Microstomum bioculatum Faubel, 1984 -- valid
  Microstomum bispiralis Stirewalt, 1937 -- valid
  Microstomum breviceps Marcus, 1951 -- valid
  Microstomum canum Fuhrmann, 1894 -- valid
  Microstomum caudatum Leidy, 1852 -- invalid
  Microstomum coerulescens (Schmarda, 1859) -- valid
  Microstomum crildensis Faubel, 1984 -- valid
  Microstomum davenporti Graff, 1911 -- valid
  Microstomum dermophthalmum Riedel, 1932 -- valid
  Microstomum diplolethicum Steinböck, 1931 -- invalid
  Microstomum gabriellae Marcus, 1950 -- valid
  Microstomum giganteum Hallez, 1878 -- invalid
  Microstomum groenlandicum Levinsen, 1879 -- valid
  Microstomum hanatum Westblad, 1953 -- valid
  Microstomum inerme Zacharias, 1894 -- invalid
  Microstomum jenseni Riedel, 1932 -- valid
  Microstomum leucops (A. L. Dugès, 1828) -- invalid
  Microstomum lineare (O. F. Müller, 1773) -- valid
  Microstomum lineare giganteum Hallez, 1878 -- valid
  Microstomum lineare lineare (O. F. Müller, 1773) -- valid
  Microstomum littorale (Ĝrsted, 1845) -- valid
  Microstomum lucidum Fuhrmann, 1898 -- valid
  Microstomum melanophthalmum Steinböck, 1933 -- valid
  Microstomum mortenseni Riedel, 1932 -- valid
  Microstomum mundum Graff, 1905 -- valid
  Microstomum ornatum Uljanin, 1870 -- valid
  Microstomum papillosum Graff, 1882 -- valid
  Microstomum paradii Graff, 1913 -- valid
  Microstomum philadelphicum Leidy, 1852 -- valid
  Microstomum punctatum Dorner, 1902 -- valid
  Microstomum rhabdotum Marcus, 1951 -- valid
  Microstomum rubromaculatum Graff, 1882 -- valid
  Microstomum septentrionale Sabussow, 1900 -- valid
  Microstomum spiculifer Faubel, 1974 -- valid
  Microstomum spiriferum Westblad, 1953 -- valid
  Microstomum tortipenis Steinböck, 1938 -- invalid
  Microstomum trichotum Marcus, 1950 -- valid
  Microstomum ulum Marcus, 1950 -- valid
  Microstomum unicolor Diesing, 1862 -- valid
  Microstomum variabile Leidy, 1851 -- invalid
  Microstylochus Kato, 1937 -- invalid
  Microstylochus akkeshiensis Kato, 1937 -- invalid
  Microvahine Karling, Mack-Fira and Dörjes, 1972 -- valid
  Microvahine corallicola Karling, Mack-Fira and Dörjes, 1972 -- valid
  Minona Marcus, 1946 -- valid
  Minona alba (Levinsen, 1879) -- invalid
  Minona albocincta Curini-Galletti, 1997 -- valid
  Minona amnica Ball and Hay, 1977 -- invalid
  Minona australis Curini-Galletti and Cannon, 1996 -- valid
  Minona baltica Karling and Kinnander, 1953 -- valid
  Minona beaglei Martens and Curini-Galletti, 1989 -- valid
  Minona bermudensis Ax and Sopott-Ehlers, 1985 -- valid
  Minona bistylifera Karling, Mack-Fira and Dörjes, 1972 -- valid
  Minona concharum Curini-Galletti and Cannon, 1996 -- valid
  Minona cornupenis Karling, 1966 -- valid
  Minona degadti Martens, 1983 -- valid
  Minona divae Marcus, 1951 -- valid
  Minona dolichovesicula Tajika, 1982 -- valid
  Minona evelinae Marcus, 1946 -- valid
  Minona fernandinensis Ax and Ax, 1977 -- valid
  Minona gemella Ax and Sopott-Ehlers, 1985 -- valid
  Minona gigantea Ax and Armonies, 1990 -- valid
  Minona hastata Martens and Curini-Galletti, 1989 -- valid
  Minona heronensis Curini-Galletti and Cannon, 1996 -- valid
  Minona ileanae Curini-Galletti, 1997 -- valid
  Minona indonesiana Martens and Curini-Galletti, 1989 -- valid
  Minona insularis (Meixner, 1928) -- invalid
  Minona istanbulensis Ax, 1959 -- invalid
  Minona itaipus (Marcus, 1950) -- invalid
  Minona mica Marcus, 1951 -- invalid
  Minona minuta Ax, 2008 -- valid
  Minona obscura Karling, 1967 -- valid
  Minona paulmartensi Curini-Galletti, 1991 -- valid
  Minona pelvivaginalis Tajika, 1982 -- valid
  Minona peteraxi Karling, 1978 -- valid
  Minona proculvaginata Curini-Galletti and Cannon, 1996 -- valid
  Minona pseudoileanae Curini-Galletti, 1997 -- valid
  Minona puertoricana Curini-Galletti, 1991 -- valid
  Minona queenslandensis Faubel and Rohde, 1998 -- valid
  Minona secta Sopott-Ehlers and Ax, 1985 -- valid
  Minona stimula Ax and Ax, 1977 -- invalid
  Minona tridens Marcus, 1954 -- invalid
  Minona trigonopora Ax, 1956 -- valid
  Minoninae Karling, 1978 -- valid
  Miodendrocoelum de Beauchamp, 1929 -- valid
  Miodendrocoelum parisi de Beauchamp, 1929 -- valid
  Miroplana Kato, 1931 -- valid
  Miroplana paulula Sluys, 2005 -- valid
  Miroplana shenzhensis Wang and Yu, 2013 -- valid
  Miroplana trifasciata Kato, 1931 -- valid
  Mirostylochus Kato, 1937 -- valid
  Mirostylochus akkashiensis Kato, 1937 -- valid
  Mirostylochus sachalinensis Tokinova, 2003 -- valid
  Mirostylochus striatus Tokinova, 2003 -- valid
  Mitchellia Kawakatsu and Chapman, 1983 -- invalid
  Mitchellia sarawakana Kawakatsu and Chapman, 1983 -- invalid
  Mityuscha Timoshkin, 2004 -- valid
  Mityuscha elenae Timoshkin, 2004 -- valid
  Mityuscha galinae Timoshkin, 2004 -- valid
  Mityuscha parvulus Timoshkin, 2004 -- valid
  Moevenbergia Armonies and Hellwig, 1987 -- valid
  Moevenbergia oculofagi Reise and Ax, 1979 -- invalid
  Moevenbergia una Armonies and Hellwig, 1987 -- valid
  Monobiceros Faubel, 1984 -- valid
  Monobiceros langi Faubel, 1984 -- valid
  Monocelididae Hofsten, 1907 -- valid
  Monocelidinae Hofsten, 1907 -- valid
  Monocelis Ehrenberg, 1831 -- valid
  Monocelis agilis Schultze, 1851 -- invalid
  Monocelis alba Levinsen, 1879 -- invalid
  Monocelis alboguttata Curini-Galletti, 1991 -- valid
  Monocelis algicola Curini-Galletti and Casu, 2016 -- valid
  Monocelis anguilla Schmidt, 1857 -- valid
  Monocelis anguilla anguilla Schmidt, 1857 -- valid
  Monocelis anguilla suchumica Czerniavsky, 1881 -- valid
  Monocelis anta Marcus, 1954 -- valid
  Monocelis assimilis Jensen, 1878 -- invalid
  Monocelis balanocephala (Böhmig, 1902) -- valid
  Monocelis bathycola Westblad, 1952 -- invalid
  Monocelis beata Curini-Galletti and Cannon, 1996 -- valid
  Monocelis bipunctata Leydig, 1854 -- invalid
  Monocelis caudatus Uljanin, 1870 -- valid
  Monocelis cincta Karling, 1967 -- valid
  Monocelis cirrhosa Marcus, 1949 -- valid
  Monocelis cirrifera Meixner, 1943 -- invalid
  Monocelis colpotriplicis Tajika, 1982 -- valid
  Monocelis corallicola Curini-Galletti and Cannon, 1996 -- valid
  Monocelis durhami Hyman, 1964 -- valid
  Monocelis excavata Diesing, 1862 -- invalid
  Monocelis exquisita Curini-Galletti and Casu, 2016 -- valid
  Monocelis fasciata Graff, 1911 -- invalid
  Monocelis fuhrmanni Midelburg, 1908 -- valid
  Monocelis fusca Ĝrsted, 1843 -- valid
  Monocelis galapagoensis Ax and Ax, 1977 -- valid
  Monocelis gamblei Graff, 1893 -- invalid
  Monocelis glaucus Diesing, 1862 -- invalid
  Monocelis gracilis (Meixner, 1938) -- valid
  Monocelis hamata Jensen, 1878 -- invalid
  Monocelis hirudo Levinsen, 1879 -- invalid
  Monocelis honorei (Steinböck, 1932) -- invalid
  Monocelis hopkinsi Karling, 1967 -- valid
  Monocelis hyalina Beneden, 1861 -- invalid
  Monocelis insularis Meixner, 1928 -- invalid
  Monocelis lacteus (Gaimard, 1842-45) -- valid
  Monocelis lata Francotte, 1882 -- invalid
  Monocelis lineata (O. F. Müller, 1773) -- valid
  Monocelis longiceps (A. L. Dugès, 1830) -- valid
  Monocelis longistyla Martens and Curini-Galletti, 1987 -- valid
  Monocelis macrobulbus Curini-Galletti and Cannon, 1996 -- valid
  Monocelis mediterranea Curini-Galletti and Mura, 1998 -- valid
  Monocelis nexilis Curini-Galletti and Cannon, 1996 -- valid
  Monocelis nitida Riedl, 1959 -- valid
  Monocelis nonscripta Curini-Galletti, 2014 -- valid
  Monocelis oculifera Ax and Ax, 1977 -- valid
  Monocelis oophaga Friedmann, 1924 -- invalid
  Monocelis ophiocephala Schmidt, 1861 -- invalid
  Monocelis orientalis Beklemischev, 1922 -- invalid
  Monocelis pardus (Marcus, 1954) -- valid
  Monocelis parvula Curini-Galletti and Mura, 1998 -- valid
  Monocelis pictocephala Martens and Curini-Galletti, 1989 -- valid
  Monocelis protractilis Graff, 1874 -- invalid
  Monocelis psilus (Marcus, 1954) -- valid
  Monocelis rotulifer Miller and Faubel, 2003 -- valid
  Monocelis rupisrubrae Curini-Galletti and Cannon, 1996 -- valid
  Monocelis rutilans (Abildgaard, 1789) -- invalid
  Monocelis scalopura Marcus, 1949 -- invalid
  Monocelis spatulicauda Girard, 1851 -- valid
  Monocelis spectator Sopott-Ehlers and Ax, 1985 -- valid
  Monocelis spinosa Jensen, 1878 -- invalid
  Monocelis subulatus Levinsen, 1879 -- invalid
  Monocelis tabira Marcus, 1950 -- valid
  Monocelis tenella Karling, 1967 -- valid
  Monocelis tenella japonica Tajika, 1982 -- valid
  Monocelis tenella tenella Karling, 1967 -- valid
  Monocelis truncatus Uljanin, 1870 -- invalid
  Monocelis unipunctata Schultze, 1851 -- invalid
  Monocelis unipunctata (Fabricius, 1826) -- invalid
  Monocelis viridirostris Sabussow, 1900 -- invalid
  Monocelis wilhelmii Graff, 1911 -- valid
  Monocelopsis Ax, 1951 -- valid
  Monocelopsis carolinensis Ax, 2008 -- valid
  Monocelopsis otoplanoides Ax, 1951 -- valid
  Monocelopsis septentrionalis (Sopott, 1972) -- valid
  Monochoerus Lohner and Micoletzky, 1911 -- invalid
  Monochoerus boehmigi Brauner, 1920 -- invalid
  Monochoerus chuni Brauner, 1920 -- invalid
  Monochoerus illardatus Lohner and Micoletzky, 1911 -- invalid
  Monochoerus lineatus Peebles, 1915 -- invalid
  Monocotylus Korotneff, 1912 -- invalid
  Monocotylus cingulatus Korotneff, 1912 -- invalid
  Monocotylus karafutoensis Okugawa, 1953 -- invalid
  Monocotylus subniger Korotneff, 1912 -- invalid
  Monodiscus Plate, 1914 -- valid
  Monodiscus macbridei Fernando, 1952 -- valid
  Monodiscus parvus Plate, 1914 -- valid
  Monoophorum Böhmig, 1890 -- valid
  Monoophorum catinosum Beklemischev, 1927 -- invalid
  Monoophorum durum Fuhrmann, 1896 -- invalid
  Monoophorum elongatum (Gamble, 1879) -- invalid
  Monoophorum graffi de Beauchamp, 1913 -- invalid
  Monoophorum granulosum Beklemischev, 1927 -- valid
  Monoophorum mutsum Marcus, 1952 -- invalid
  Monoophorum pleiocelis Graff, 1911 -- valid
  Monoophorum ruseri Reisinger, 1926 -- valid
  Monoophorum stiliferum Westblad, 1955 -- invalid
  Monoophorum striatum (Graff, 1878) -- valid
  Monoophorum tigacum Marcus, 1950 -- valid
  Monoophorum triste Graff, 1911 -- invalid
  Monoophorum tubiferum (Westblad, 1955) -- valid
  Monoporus Graff, 1891 -- invalid
  Monoporus rubropunctata (O. Schmidt, 1852) -- invalid
  Monoposthia Ehlers and Dörjes, 1979 -- invalid
  Monoposthia pseudovesicula Ehlers and Dörjes, 1979 -- invalid
  Monops Diesing, 1862 -- invalid
  Monops agilis Diesing, 1862 -- invalid
  Monops agilis (Schultze, 1851) -- invalid
  Monops assimilis (Jensen, 1878) -- invalid
  Monops elegans Gaimard, 1842-45 -- invalid
  Monops flustrae (Dalyell, 1853) -- invalid
  Monops fuscus (Ĝrsted, 1843) -- invalid
  Monops lineatus (O. F. Müller, 1773) -- invalid
  Monops nigroflavus Gaimard, 1842-45 -- invalid
  Monops obesus Gaimard, 1842-45 -- invalid
  Monops spatulicauda (Girard, 1851) -- invalid
  Monops subulatus O. F. Müller, 1788 -- invalid
  Monops umbrinus Gaimard, 1842-45 -- invalid
  Monosolenia Hyman, 1953 -- valid
  Monosolenia asymmetrica Hyman, 1953 -- valid
  Monostichoplana Ax, 1956 -- valid
  Monostichoplana filum (Meixner, 1938) -- valid
  Monostichoplana filum filum (Meixner, 1938) -- valid
  Monostichoplana filum neapolitana Ax, Weidemann and Ehlers, 1978 -- valid
  Monostichoplana fonsecai Curini-Galletti, 2014 -- valid
  Monostichoplana tenuissima Ax, 1956 -- valid
  Monostoma Diesing, 1862 -- invalid
  Monotocelis Meixner, 1938 -- invalid
  Monotocelis gracilis Meixner, 1938 -- invalid
  Monotoplana Meixner, 1938 -- valid
  Monotoplana diorchis Meixner, 1938 -- valid
  Monotoplana rufifrons (Westblad, 1952) -- valid
  Monotoplanidae Ax, 1958 -- valid
  Monotus Diesing, 1862 -- valid
  Monotus agilis Graff, 1882 -- invalid
  Monotus albicinctus (Schultze, 1849) -- invalid
  Monotus albus (Levinsen, 1879) -- valid
  Monotus bipunctatus (Leydig, 1854) -- invalid
  Monotus crenulatum (Schmarda, 1859) -- valid
  Monotus diesingi (Schmidt, 1852) -- invalid
  Monotus excavatus Diesing, 1862 -- invalid
  Monotus fusca (Ĝrsted, 1843) -- invalid
  Monotus glauca (Diesing, 1862) -- invalid
  Monotus hirudo (Levinsen, 1879) -- invalid
  Monotus hyalina (Beneden, 1861) -- valid
  Monotus johnstoni Diesing, 1862 -- invalid
  Monotus lacteus Gaimard, 1842-45 -- invalid
  Monotus lineatus (O. F. Müller, 1773) -- invalid
  Monotus mesopharynx Diesing, 1862 -- valid
  Monotus morgiensis (Du Plessis, 1876) -- invalid
  Monotus paradoxa (Ĝrsted, 1843) -- invalid
  Monotus relictus Zacharias, 1885 -- invalid
  Monotus rutilans (Ehrenberg, 1831) -- invalid
  Monotus schultzii (Schmidt, 1852) -- invalid
  Monotus setosus Du Plessis, 1889 -- invalid
  Monotus spatulicauda (Girard, 1851) -- invalid
  Monotus unipunctatus (Fabricius, 1826) -- invalid
  Monotus viridirostris Sabussow, 1900 -- invalid
  Monticellina Westblad, 1953 -- valid
  Monticellina longituba Westblad, 1953 -- valid
  Morimiurella Timoshkin, 2010 -- valid
  Morimiurella nakanoi Timoshkin, 2010 -- valid
  Mucroplana Sopott-Ehlers and Schmidt, 1975 -- valid
  Mucroplana caelata Sopott-Ehlers and Schmidt, 1975 -- valid
  Mucroplanidae Faubel, 1983 -- valid
  Multipeniata Nasonov, 1927 -- valid
  Multipeniata (Paramultipeniata) Kulinitch, 1974 -- invalid
  Multipeniata batalansae Nasonov, 1927 -- valid
  Multipeniata birmanse (Westblad, 1956) -- valid
  Multipeniata californica Karling and Jondelius, 1995 -- valid
  Multipeniata kho Nasonov, 1927 -- valid
  Multipeniatidae Karling, 1940 -- valid
  Munseoma Bulnes, Faubel and Park, 2005 -- valid
  Munseoma maculata Bulnes, Faubel and Park, 2005 -- valid
  Myobulla Artois and Schockaert, 2000 -- valid
  Myobulla dunata Artois and Schockaert, 2000 -- valid
  Myobulla myobulla Artois and Schockaert, 2000 -- valid
  Myobulla swedmarki (Karling, 1978) -- valid
  Myomacrostomum Rieger, 1986 -- valid
  Myomacrostomum bichaeta Rieger, 1986 -- valid
  Myomacrostomum rubrioculum Janssen, Vizoso, Schulte, Littlewood, Waeschenbach and Schärer, 2015 -- valid
  Myomacrostomum unichaeta Rieger, 1986 -- valid
  Myopea Crezee, 1975 -- valid
  Myopea crassula Crezee, 1975 -- valid
  Myopea latafaucium Crezee, 1975 -- valid
  Myoramyxa Newman and Cannon, 1997 -- valid
  Myoramyxa pardalota Newman and Cannon, 1997 -- valid
  Myoretronectes Noreña-Janssen and Faubel, 1996 -- valid
  Myoretronectes paranaensis Noreña-Janssen and Faubel, 1996 -- valid
  Myostenostomum Luther, 1960 -- valid
  Myostenostomum bulbocaudatum Luther, 1960 -- valid
  Myostenostomum gigerium (Kepner and Carter, 1931) -- invalid
  Myostenostomum ilmenicum Rogozin, 1992 -- valid
  Myostenostomum lutheri Rogozin, 1992 -- valid
  Myostenostomum marcusi Rogozin, 1992 -- valid
  Myostenostomum tauricum (Nasonov, 1924) -- invalid
  Myostenostomum vanderlandi Rogozin, 1992 -- valid
  Myostomella Riedl, 1954 -- invalid
  Myostomella pulchella Riedl, 1954 -- invalid
  Myostomellidae Riedl, 1954 -- invalid
  Myozona Marcus, 1949 -- valid
  Myozona aerumnosa Sopott-Ehlers and Schmidt, 1974 -- valid
  Myozona evelinae Marcus, 1949 -- valid
  Myozona lutheri Papi, 1953 -- valid
  Myozona psila Sopott-Ehlers and Schmidt, 1974 -- valid
  Myozona purpurea Faubel, 1974 -- valid
  Myozona stylifera Ax, 1956 -- valid
  Myozonaria Rieger, 1968 -- valid
  Myozonaria americana Rieger, 1971 -- invalid
  Myozonaria arcassonensis Rieger, 1971 -- valid
  Myozonaria ascia Sopott-Ehlers and Schmidt, 1974 -- valid
  Myozonaria bistylifera Rieger, 1968 -- valid
  Myozonaria carolinensis Rieger, 1971 -- invalid
  Myozonaria falcis Sopott-Ehlers, 1976 -- valid
  Myozonaria fissipara Janssen, Vizoso, Schulte, Littlewood, Waeschenbach and Schärer, 2015 -- valid
  Myozonaria jenneri Rieger and Tyler, 1974 -- valid
  Myozonaria mediterranea Rieger, 1971 -- invalid
  Myozonaria microstyla Rieger, 1971 -- invalid
  Myozonariinae Janssen, Vizoso, Schulte, Littlewood, Waeschenbach and Schärer, 2015 -- valid
  Myozonella Beklemischev, 1955 -- valid
  Myozonella microstomoidis Beklemischev, 1955 -- valid
  Myrmeciplana Graff, 1911 -- valid
  Myrmeciplana elegans Graff, 1911 -- valid
  Nadina Uljanin, 1870 -- valid
  Nadina evelinae (Marcus, 1952) -- valid
  Nadina minuta (Claparède, 1863) -- valid
  Nadina pulchella Uljanin, 1870 -- valid
  Nadina sensitiva Uljanin, 1870 -- invalid
  Nadinidae Dörjes, 1968 -- valid
  Namyhplana Brusa and Damborenea, 2013 -- valid
  Namyhplana henriettae Brusa and Damborenea, 2013 -- valid
  Nannorhynchides Karling, 1964 -- valid
  Nannorhynchides corneus Brunet, 1965 -- valid
  Nannorhynchides harparius Brunet, 1965 -- valid
  Nannorhynchides herdlaensis (Karling, 1956) -- valid
  Nannorhynchides nigrescens Evdonin, 1971 -- invalid
  Nannorhynchides vividus Brunet, 1965 -- valid
  Nannorhynchididae Evdonin, 1977 -- valid
  Nannorhynchidinae Evdonin, 1977 -- invalid
  Nannorhynchus Karling, 1956 -- invalid
  Napoliplana Ax, Weidemann and Ehlers, 1978 -- valid
  Napoliplana cinctata Ax, Weidemann and Ehlers, 1978 -- valid
  Nautiloplana Stimpson, 1857 -- invalid
  Nautiloplana cristata (Quatrefage, 1845) -- invalid
  Nautiloplana oceanica (Darwin, 1844) -- invalid
  Necia Marcus, 1950 -- valid
  Necia boreoceloides Curini-Galletti, 1997 -- valid
  Necia sopha Marcus, 1950 -- valid
  Nematoplana Meixner, 1938 -- valid
  Nematoplana asita Marcus, 1950 -- valid
  Nematoplana caesarea Curini-Galletti and Martens, 1992 -- valid
  Nematoplana calamus Curini-Galletti, Oggiano and Casu, 2001 -- valid
  Nematoplana cannoni Curini-Galletti, Oggiano and Casu, 2002 -- valid
  Nematoplana caribbea Curini-Galletti and Martens, 1992 -- valid
  Nematoplana ciliovesiculae Tajika, 1979 -- valid
  Nematoplana coelogynoporoides Meixner, 1938 -- valid
  Nematoplana corsicana Curini-Galletti and Martens, 1992 -- valid
  Nematoplana cyclops Curini-Galletti, Oggiano and Casu, 2002 -- valid
  Nematoplana erythraeensis Curini-Galletti and Martens, 1992 -- valid
  Nematoplana ezoplanoides Curini-Galletti, Oggiano and Casu, 2002 -- valid
  Nematoplana hamata Curini-Galletti, Oggiano and Casu, 2002 -- valid
  Nematoplana indica Curini-Galletti, Oggiano and Casu, 2001 -- valid
  Nematoplana martensi Curini-Galletti, Oggiano and Casu, 2002 -- valid
  Nematoplana mirabilis Curini-Galletti, 2014 -- valid
  Nematoplana naia Marcus, 1949 -- valid
  Nematoplana nigrocapitula Ax, 1966 -- valid
  Nematoplana pullolineata Tajika, 1979 -- valid
  Nematoplana riegeri Curini-Galletti and Martens, 1992 -- valid
  Nematoplana rubra Curini-Galletti, Oggiano and Casu, 2002 -- valid
  Nematoplana sinaitica Curini-Galletti and Martens, 1992 -- valid
  Nematoplanidae Meixner, 1938 -- valid
  Nematorhynchidae Schilke, 1969 -- valid
  Nematorhynchus Schilke, 1969 -- valid
  Nematorhynchus parvoacumine Schilke, 1969 -- valid
  Nemertinoides Riser, 1987 -- valid
  Nemertinoides elongatus Riser, 1987 -- valid
  Nemertinoides glandulosum Meyer-Wachsmuth, Curini Galletti and Jondelius, 2014 -- valid
  Nemertinoides wolfgangi Meyer-Wachsmuth, Curini Galletti and Jondelius, 2014 -- valid
  Nemertoderma Steinböck, 1930 -- valid
  Nemertoderma bathycola Steinböck, 1930 -- valid
  Nemertoderma psammicola Sterrer, 1970 -- invalid
  Nemertoderma rubra Faubel, 1976 -- invalid
  Nemertoderma westbladi (Westblad, 1937) -- valid
  Nemertodermatida Karling, 1940 -- valid
  Nemertodermatidae Steinböck, 1930 -- valid
  Nemertoscolex Greeff, 1877 -- invalid
  Nemertoscolex parasiticus Greeff, 1877 -- invalid
  Neochildia Bush, 1975 -- valid
  Neochildia fusca Bush, 1975 -- valid
  Neodalyellida Willems, Wallberg, Jondelius, Littlewood, Backeljau, Schockaert and Artois, 2006 -- invalid
  Neodendrocoelum Stankovic and Komarek, 1927 -- valid
  Neodendrocoelum adenodactylosum Stankovic and Komarek, 1927 -- invalid
  Neodendrocoelum album Komarek, 1953 -- valid
  Neodendrocoelum cruciferum Stankovic, 1969 -- invalid
  Neodendrocoelum findeneggi Reisinger, 1971 -- invalid
  Neodendrocoelum grande Paunovic and Rimsa, 1968 -- valid
  Neodendrocoelum jablanicense Stankovic and Komarek, 1927 -- invalid
  Neodendrocoelum komareki Stankovic, 1969 -- invalid
  Neodendrocoelum lacustre Stankovic, 1938 -- invalid
  Neodendrocoelum lychnidicum Stankovic, 1969 -- invalid
  Neodendrocoelum maculatum Stankovic and Komarek, 1927 -- invalid
  Neodendrocoelum magnum Stankovic, 1969 -- invalid
  Neodendrocoelum nausicae (Schmidt, 1861) -- invalid
  Neodendrocoelum ochridense Stankovic and Komarek, 1927 -- invalid
  Neodendrocoelum plesiophthalmum (de Beauchamp, 1937) -- invalid
  Neodendrocoelum prespense Stankovic, 1969 -- invalid
  Neodendrocoelum sanctinaumi Stankovic and Komarek, 1927 -- invalid
  Neodendrocoelum suetinaumi Geus, 1967 -- valid
  Neognathorhynchus Karling, 1956 -- valid
  Neognathorhynchus lobatus (Ax, 1952) -- valid
  Neognathorhynchus longostilo Schilke, 1970 -- invalid
  Neognathorhynchus suecicus Karling, 1956 -- valid
  Neokytorhynchus Ehlers and Ehlers, 1981 -- valid
  Neokytorhynchus pacificus Ehlers and Ehlers, 1981 -- valid
  Neomecynostomum Faubel and Regier, 1983 -- valid
  Neomecynostomum granulum (Dörjes, 1968) -- valid
  Neoophora Westblad, 1948 -- invalid
  Neoplacorhynchus Evdonin, 1977 -- valid
  Neoplacorhynchus bakuensis Evdonin, 1977 -- valid
  Neoplanocera Yeri and Kaburaki, 1918 -- valid
  Neoplanocera elongata Yeri and Kaburaki, 1918 -- valid
  Neoplanocera steueri (Steinböck, 1937) -- valid
  Neopolycystis Karling, 1955 -- valid
  Neopolycystis tridentata Karling, 1955 -- valid
  Neoschizorhynchus Schilke, 1970 -- valid
  Neoschizorhynchus brevipharynggus Schilke, 1970 -- valid
  Neoschizorhynchus longipharynggus Schilke, 1970 -- valid
  Neoschizorhynchus parvorostro Ax and Heller, 1970 -- valid
  Neostylochus Yeri and Kaburaki, 1920 -- valid
  Neostylochus caraibica (Palombi, 1923) -- valid
  Neostylochus fulvopunctatus Yeri and Kaburaki, 1920 -- valid
  Neostylochus pacificus Bock, 1923 -- valid
  Neostylochus viridis Bock, 1925 -- valid
  Neotyphloplanida Willems, Wallberg, Jondelius, Littlewood, Backeljau, Schockaert and Artois, 2006 -- invalid
  Neoutelga Karling, 1980 -- valid
  Neoutelga inermis Karling, 1980 -- valid
  Nephtheaplana Prudhoe, 1985 -- invalid
  Nephtheaplana tropica (Hyman, 1959) -- invalid
  Neppia Ball, 1974 -- valid
  Neppia boehmigi (Weiss, 1909) -- invalid
  Neppia evelinae (Marcus, 1955) -- valid
  Neppia falklandica (Westblad, 1952) -- valid
  Neppia jeanneli (de Beauchamp, 1913) -- valid
  Neppia magnibursalis Sluys and Kawakatsu, 2001 -- valid
  Neppia montana (Nurse, 1950) -- invalid
  Neppia paeta (Marcus, 1955) -- valid
  Neppia schubarti (Marcus, 1946) -- invalid
  Neppia tinga (Marcus, 1955) -- valid
  Neppia wimbimba (Marcus, 1970) -- valid
  Nerpa Marcus, 1948 -- valid
  Nerpa evelinae Marcus, 1948 -- valid
  Nesion Hyman, 1956 -- valid
  Nesion arcticum Hyman, 1956 -- valid
  Nesioninae Hyman, 1956 -- invalid
  Newzealandia Ogren and Kawakatsu, 1991 -- valid
  Newzealandia agricola (Dendy, 1895) -- valid
  Newzealandia agricola agricola (Dendy, 1895) -- valid
  Newzealandia agricola maori (Dendy, 1901) -- valid
  Newzealandia graffii (Dendy, 1895) -- valid
  Newzealandia graffii angusta (Dendy, 1901) -- valid
  Newzealandia graffii castanea (Dendy, 1901) -- valid
  Newzealandia graffii clintonensis (Dendy, 1901) -- valid
  Newzealandia graffii graffii (Dendy, 1895) -- valid
  Newzealandia graffii nigrescens (Dendy, 1901) -- valid
  Newzealandia graffii nodosa (Dendy, 1901) -- valid
  Newzealandia graffii occidentalis (Dendy, 1896) -- valid
  Newzealandia graffii otiraensis (Dendy, 1896) -- valid
  Newzealandia graffii somersii (Dendy, 1896) -- valid
  Newzealandia graffii wharekauriensis (Dendy, 1901) -- valid
  Newzealandia inaequabilis (Fyfe, 1956) -- valid
  Newzealandia inaequalistriata (Dendy, 1895) -- valid
  Newzealandia iris (Dendy, 1896) -- valid
  Newzealandia moseleyi (Hutton, 1880) -- valid
  Nexilidae Holleman and Hand, 1962 -- invalid
  Nexilis Holleman and Hand, 1962 -- valid
  Nexilis epichitonius Holleman and Hand, 1962 -- valid
  Nigerrhynchus Schilke, 1970 -- valid
  Nigerrhynchus opisthoporus Schilke, 1970 -- valid
  Niobe Girard, 1852 -- valid
  Niobe zonata Girard, 1852 -- valid
  Nonatona Marcus, 1952 -- valid
  Nonatona euscopa Marcus, 1952 -- valid
  Notentera Joffe, Selivanova and Kornakova, 1997 -- valid
  Notentera ivanovi Joffe, Selivanova and Kornakova, 1997 -- valid
  Notenteridae Joffe, Selivanova and Kornakova, 1997 -- valid
  Notocaryoplana Steinböck, 1935 -- valid
  Notocaryoplana arctica Steinböck, 1935 -- valid
  Notocaryoplana geminofollicularis Tajika, 1983 -- valid
  Notocaryoplanella Ax, 1956 -- invalid
  Notocaryoplanella glandulosa (Ax, 1951) -- invalid
  Notocaryoturbella Lanfranchi, 1969 -- valid
  Notocaryoturbella bigermaria Lanfranchi, 1969 -- valid
  Notocelis Dörjes, 1968 -- valid
  Notocelis gullmarensis (Westblad, 1946) -- valid
  Notocelis gullmarensis maculata Karling, Mack-Fira and Dörjes, 1972 -- invalid
  Notocelis maculata Karling, Mack-Fira and Dörjes, 1972 -- valid
  Notocelis rubidocula Kozloff, 2000 -- valid
  Notocelis subsalina (Ax, 1959) -- valid
  Notocirridae Faubel, 1983 -- invalid
  Notocirrus Faubel, 1983 -- invalid
  Notocirrus neupommerensis Faubel, 1983 -- invalid
  Notocomplana Faubel, 1983 -- valid
  Notocomplana acticola (Boone, 1929) -- valid
  Notocomplana celeris (Freeman, 1933) -- valid
  Notocomplana chierchiae (Plehn, 1896) -- valid
  Notocomplana erythrotaenia (Schmarda, 1859) -- valid
  Notocomplana evelinae (Marcus, 1947) -- valid
  Notocomplana gardineri (Laidlaw, 1904) -- valid
  Notocomplana humilis (Stimpson, 1857) -- valid
  Notocomplana koreana (Kato, 1937) -- valid
  Notocomplana lapunda (Marcus and Marcus, 1968) -- valid
  Notocomplana libera (Kato, 1939) -- valid
  Notocomplana litoricola (Heath and McGregor, 1912) -- valid
  Notocomplana longiducta (Hyman, 1959) -- valid
  Notocomplana longisaccata (Hyman, 1959) -- valid
  Notocomplana martae (Marcus, 1948) -- valid
  Notocomplana mexicana (Hyman, 1953) -- valid
  Notocomplana microsora (Schmarda, 1859) -- valid
  Notocomplana natans (Freeman, 1933) -- valid
  Notocomplana otophora (Schmarda, 1859) -- valid
  Notocomplana palaoensis (Kato, 1943) -- valid
  Notocomplana palta (Marcus, 1954) -- valid
  Notocomplana rupicola (Heath and McGregor, 1912) -- valid
  Notocomplana sanguinea (Freeman, 1933) -- valid
  Notocomplana sanjuania (Freeman, 1933) -- valid
  Notocomplana saxicola (Heath and McGregor, 1912) -- valid
  Notocomplana sciophila (Boone, 1929) -- valid
  Notocomplana septentrionalis (Kato, 1937) -- valid
  Notocomplana sophia (Kato, 1939) -- valid
  Notocomplana syntoma (Marcus, 1947) -- valid
  Notocomplana tavoyensis (Prudhoe, 1950) -- valid
  Notocomplana timida (Heath and McGregor, 1912) -- valid
  Notodactylus Baer, 1953 -- valid
  Notodactylus handschini (Baer, 1945) -- valid
  Notogynaphallia Ogren and Kawakatsu, 1990 -- valid
  Notogynaphallia abundans (Graff, 1899) -- invalid
  Notogynaphallia albonigra (Riester, 1938) -- invalid
  Notogynaphallia andina (Hyman, 1962) -- valid
  Notogynaphallia arturi Lemos and Leal-Zanchet, 2008 -- invalid
  Notogynaphallia atra (Schultze and F. Müller, 1857) -- valid
  Notogynaphallia bergi (Graff, 1899) -- invalid
  Notogynaphallia biseminalis (Riester, 1938) -- valid
  Notogynaphallia caissara (E. M. Froehlich, 1955) -- invalid
  Notogynaphallia ceciliae E. M. Froehlich and Leal-Zanchet, 2003 -- invalid
  Notogynaphallia ernesti Leal-Zanchet and E. M. Froehlich, 2006 -- invalid
  Notogynaphallia fita (C. G. Froehlich, 1959) -- invalid
  Notogynaphallia froehlichae Ogren and Kawakatsu, 1990 -- valid
  Notogynaphallia garua (Du Bois-Reymond Marcus, 1951) -- valid
  Notogynaphallia goetschi (Riester, 1938) -- valid
  Notogynaphallia graffi Leal-Zanchet and E. M. Froehlich, 2006 -- invalid
  Notogynaphallia guaiana Leal-Zanchet and Carbayo, 2001 -- invalid
  Notogynaphallia marginata (Graff, 1899) -- invalid
  Notogynaphallia matuta (E. M. Froehlich, 1955) -- invalid
  Notogynaphallia meixneri (Riester, 1938) -- valid
  Notogynaphallia modesta (Graff, 1899) -- valid
  Notogynaphallia mourei (C. G. Froehlich, 1956) -- valid
  Notogynaphallia muelleri (Diesing, 1861) -- invalid
  Notogynaphallia nana (C. G. Froehlich, 1956) -- valid
  Notogynaphallia nataliae (C. G. Froehlich, 1959) -- invalid
  Notogynaphallia nawei Negrete, Leal-Zanchet and Brusa, 2015 -- valid
  Notogynaphallia octostriata (Schultze and F. Müller, 1857) -- valid
  Notogynaphallia parca (E. M. Froehlich, 1955) -- valid
  Notogynaphallia plumbea (C. G. Froehlich, 1956) -- valid
  Notogynaphallia pseudoceciliae Lemos and Leal-Zanchet, 2008 -- invalid
  Notogynaphallia quinquestriata (Hyman, 1962) -- valid
  Notogynaphallia schultzei (Diesing, 1862) -- valid
  Notogynaphallia sexlineata (Riester, 1938) -- valid
  Notogynaphallia sexstriata (Graff, 1899) -- valid
  Notogynaphallia tuxaua (E. M. Froehlich, 1955) -- invalid
  Notomonoophorum Luther, 1948 -- valid
  Notomonoophorum coecum Luther, 1948 -- valid
  Notomonoophorum oculatum Westblad, 1954 -- valid
  Notoplana Laidlaw, 1903 -- valid
  Notoplana acticola (Boone, 1929) -- invalid
  Notoplana alcinoi (Schmidt, 1861) -- valid
  Notoplana annula Marcus and Marcus, 1968 -- valid
  Notoplana atlantica (Plehn, 1896) -- valid
  Notoplana atlantica Bock, 1913 -- invalid
  Notoplana atomata (O. F. Müller, 1776) -- invalid
  Notoplana australis (Schmarda, 1859) -- valid
  Notoplana australis (Laidlaw, 1904) -- invalid
  Notoplana australis huina Marcus, 1954 -- invalid
  Notoplana bahamensis Bock, 1913 -- invalid
  Notoplana binoculata (Verrill, 1901) -- invalid
  Notoplana caribbeana Hyman, 1939 -- invalid
  Notoplana celeris Freeman, 1933 -- invalid
  Notoplana chierchiae (Plehn, 1896) -- invalid
  Notoplana comes Cannon and Grygier, 1991 -- valid
  Notoplana cotylifera Meixner, 1907 -- valid
  Notoplana delicata (Jacubowa, 1906) -- valid
  Notoplana delicata Yeri and Kaburaki, 1918 -- invalid
  Notoplana distincta Prudhoe, 1982 -- valid
  Notoplana divae Marcus, 1948 -- valid
  Notoplana dubia (Schmarda, 1859) -- valid
  Notoplana erythrotaenia (Schmarda, 1859) -- invalid
  Notoplana evansii Laidlaw, 1903 -- invalid
  Notoplana fallax (Quatrefage, 1845) -- invalid
  Notoplana ferruginea (Schmarda, 1859) -- invalid
  Notoplana gardineri (Laidlaw, 1904) -- invalid
  Notoplana haloglena (Schmarda, 1859) -- valid
  Notoplana humilis (Stimpson, 1857) -- invalid
  Notoplana igiliensis Galleni, 1974 -- valid
  Notoplana inquieta Freeman, 1933 -- invalid
  Notoplana inquieta (Heath and McGregor, 1912) -- invalid
  Notoplana inquilina Hyman, 1955 -- valid
  Notoplana insularis Hyman, 1939 -- valid
  Notoplana japonica Kato, 1937 -- invalid
  Notoplana koreana Kato, 1937 -- invalid
  Notoplana kuekenthali (Plehn, 1896) -- valid
  Notoplana lactoalba (Verrill, 1900) -- invalid
  Notoplana lapunda Marcus and Marcus, 1968 -- invalid
  Notoplana libera Kato, 1939 -- invalid
  Notoplana longastyletta (Freeman, 1933) -- valid
  Notoplana longicrumena Prudhoe, 1982 -- valid
  Notoplana longiducta Hyman, 1959 -- invalid
  Notoplana longisaccata Hyman, 1959 -- invalid
  Notoplana longisaccati Hyman, 1959 -- invalid
  Notoplana martae Marcus, 1948 -- invalid
  Notoplana megala Marcus, 1952 -- invalid
  Notoplana micheli Marcus, 1949 -- valid
  Notoplana micronesiana Hyman, 1959 -- valid
  Notoplana microsora (Schmarda, 1859) -- invalid
  Notoplana mortenseni Bock, 1913 -- invalid
  Notoplana natans Freeman, 1933 -- invalid
  Notoplana nationalis (Plehn, 1896) -- invalid
  Notoplana otophora (Schmarda, 1859) -- invalid
  Notoplana ovalis Bock, 1913 -- invalid
  Notoplana palaoensis Kato, 1943 -- invalid
  Notoplana palta Marcus, 1954 -- invalid
  Notoplana parvula Palombi, 1923 -- valid
  Notoplana patellarum (Stimpson, 1855) -- invalid
  Notoplana pegnis Nicoll, 1934 -- valid
  Notoplana plecta Marcus, 1947 -- valid
  Notoplana plehni (Bock, 1913) -- invalid
  Notoplana puma Marcus, 1954 -- valid
  Notoplana queruca Marcus and Marcus, 1968 -- valid
  Notoplana robusta Palombi, 1928 -- invalid
  Notoplana rugulosa Hagiya, 1992 -- valid
  Notoplana rupicola (Heath and McGregor, 1912) -- invalid
  Notoplana sanguinea Freeman, 1933 -- invalid
  Notoplana sanjuania Freeman, 1933 -- invalid
  Notoplana sanpedrensis Freeman, 1930 -- valid
  Notoplana sawayai Marcus, 1947 -- valid
  Notoplana saxicola (Heath and McGregor, 1912) -- invalid
  Notoplana sciophila (Boone, 1929) -- invalid
  Notoplana segnis Freeman, 1933 -- invalid
  Notoplana septentrionalis Kato, 1937 -- invalid
  Notoplana serica Kato, 1938 -- valid
  Notoplana similis Dawydoff, 1952 -- valid
  Notoplana sophia Kato, 1939 -- invalid
  Notoplana stilifera Bock, 1923 -- valid
  Notoplana suteri (Jacubowa, 1906) -- valid
  Notoplana syntoma Marcus, 1947 -- invalid
  Notoplana tavoyensis Prudhoe, 1950 -- invalid
  Notoplana timida (Heath and McGregor, 1912) -- invalid
  Notoplana tipuca (Marcus and Marcus, 1968) -- valid
  Notoplana virilis (Verrill, 1893) -- invalid
  Notoplana vitrea (Lang, 1884) -- valid
  Notoplana willeyi Jacubowa, 1906 -- valid
  Notoplanella Bock, 1931 -- valid
  Notoplanella inarmata Bock, 1931 -- valid
  Notoplanidae Marcus and Marcus, 1966 -- valid
  Notoplanides Palombi, 1928 -- invalid
  Notoplanides Marcus and Marcus, 1968 -- invalid
  Notoplanides alcha Marcus and Marcus, 1968 -- invalid
  Notoplanides opisthopharynx Palombi, 1928 -- invalid
  Notoplehnia Faubel, 1983 -- valid
  Notoplehnia nationalis (Plehn, 1896) -- valid
  Notothrix Hickman, 1956 -- valid
  Notothrix inquilina Hickman, 1956 -- valid
  Novibipalium Kawakatsu, Ogren and E. M. Froehlich, 1998 -- valid
  Novibipalium alterifuscatum Kawakatsu, Ogren and E. M. Froehlich, 1998 -- valid
  Novibipalium falsifuscatum Kawakatsu, Ogren and E. M. Froehlich, 1998 -- valid
  Novibipalium miyukiae Kawakatsu, Sluys and Ogren, 2005 -- valid
  Novibipalium murayamai Kawakatsu, Sluys and Ogren, 2005 -- valid
  Novibipalium trifuscostriatum (Kaburaki, 1922) -- valid
  Novibipalium venosum (Kaburaki, 1922) -- valid
  Nuchenceros Gemmill and Leiper, 1907 -- invalid
  Nuchenceros orcadensis Gemmill and Leiper, 1907 -- invalid
  Nuchenoceros Gemmill and Leiper, 1907 -- invalid
  Nygulgus Marcus, 1954 -- valid
  Nygulgus evelinae Marcus, 1954 -- valid
  Nymphozoon Hyman, 1959 -- valid
  Nymphozoon bayeri Hyman, 1959 -- valid
  Oahuhawaiiana Kawakatsu and Mitchell, 1984 -- invalid
  Oahuhawaiiana kazukolinda Kawakatsu and Mitchell, 1984 -- invalid
  Obama Carbayo, Alvarez-Presas, Olivares, Marques, E. M. Froehlich and Riutort, 2013 -- valid
  Obama anthropophila Amaral, Carbayo and Leal-Zanchet, 2015 -- valid
  Obama apeva (C. G. Froehlich, 1959) -- valid
  Obama applanata (Graff, 1899) -- valid
  Obama argus (Graff, 1899) -- valid
  Obama assu (C. G. Froehlich, 1959) -- valid
  Obama baptistae (Leal-Zanchet and Oliveira, 2012) -- valid
  Obama braunsi (Graff, 1899) -- valid
  Obama burmeisteri (Schultze and F. Müller, 1857) -- valid
  Obama carbayoi (Oliveira and Leal-Zanchet, 2012) -- valid
  Obama carinata (Riester, 1938) -- valid
  Obama carrierei (Graff, 1897) -- valid
  Obama catharina (Hyman, 1957) -- valid
  Obama decidualis Amaral and Leal-Zanchet, 2015 -- valid
  Obama dictyonota (Riester, 1938) -- valid
  Obama divae (Marcus, 1951) -- valid
  Obama eudoxia (Ogren and Kawakatsu, 1990) -- valid
  Obama eudoximariae (Ogren and Kawakatsu, 1990) -- valid
  Obama evelinae (Marcus, 1951) -- valid
  Obama ferussaci (Graff, 1897) -- valid
  Obama ficki (Amaral and Leal-Zanchet, 2012) -- valid
  Obama fryi (Graff, 1899) -- valid
  Obama glieschi (C. G. Froehlich, 1959) -- valid
  Obama itatiayana (Schirch, 1929) -- valid
  Obama josefi (Carbayo and Leal-Zanchet, 2001) -- valid
  Obama ladislavii (Graff, 1899) -- valid
  Obama livia (E. M. Froehlich, 1955) -- valid
  Obama maculipunctata Rossi, Amaral, Ribeiro, Cauduro, Fick, Valiati and Leal-Zanchet, 2015 -- valid
  Obama marmorata (Schultze and F. Müller, 1857) -- valid
  Obama metzi (Graff, 1899) -- valid
  Obama otavioi Carbayo, 2016 -- valid
  Obama poca (C. G. Froehlich, 1957) -- valid
  Obama polyophthalma (Graff, 1899) -- valid
  Obama riesteri (C. G. Froehlich, 1955) -- valid
  Obama rufiventris (Schultze and F. Müller, 1857) -- valid
  Obama ruiva (E. M. Froehlich, 1972) -- valid
  Obama schubarti (C. G. Froehlich, 1957) -- valid
  Obama trigueira (E. M. Froehlich, 1955) -- valid
  Obolkinaella Timoshkin, 2004 -- valid
  Obolkinaella genkali Timoshkin, 2004 -- valid
  Obrimoposthia Sluys and Ball, 1989 -- valid
  Obrimoposthia acuminata Sluys and Ball, 1989 -- valid
  Obrimoposthia aparala Sluys and De Vries, 1989 -- valid
  Obrimoposthia hallezi (Böhmig, 1908) -- valid
  Obrimoposthia ohlini (Bergendal, 1899) -- valid
  Obrimoposthia wandeli (Hallez, 1906) -- valid
  Oculoplana Pearse, 1938 -- invalid
  Oculoplana whartoni Pearse, 1938 -- invalid
  Odontorhynchus Karling, 1947 -- valid
  Odontorhynchus aculeatus Karling, 1956 -- valid
  Odontorhynchus lonchiferus Karling, 1947 -- valid
  Oekiocolax Reisinger, 1929 -- valid
  Oekiocolax plagiostomorum Reisinger, 1929 -- valid
  Oligochoerus Beklemischev, 1963 -- valid
  Oligochoerus bakuensis Beklemischev, 1963 -- valid
  Oligochoerus chlorella Beklemischev, 1963 -- valid
  Oligochoerus conops Beklemischev, 1963 -- valid
  Oligochoerus erythrophthalmus Beklemischev, 1963 -- valid
  Oligochoerus limnophilus Ax and Dörjes, 1966 -- valid
  Oligochoerus melanops Beklemischev, 1963 -- valid
  Oligochoerus polonicus Kolasa and Faubel, 1974 -- invalid
  Oligochoerus xanthella Beklemischev, 1963 -- valid
  Oligoclado Pearse, 1938 -- valid
  Oligoclado floridanus Pearse, 1938 -- valid
  Oligocladus Lang, 1884 -- valid
  Oligocladus albus Freeman, 1933 -- invalid
  Oligocladus auritus (Claparède, 1861) -- valid
  Oligocladus bathymodiensis Quiroga, Bolaños and Litvaitis, 2008 -- valid
  Oligocladus sanguinolentus (Quatrefage, 1845) -- valid
  Oligocladus voightae Quiroga, Bolaños and Litvaitis, 2006 -- valid
  Oligofilomorpha Dörjes, 1971 -- valid
  Oligofilomorpha interstitiophilum Faubel, 1974 -- valid
  Oligofilomorpha karlingi Dörjes, 1971 -- valid
  Olisthanella Voigt, 1892 -- valid
  Olisthanella albiensis Sekera, 1912 -- valid
  Olisthanella arctica Nasonov, 1923 -- invalid
  Olisthanella bresslaui Sekera, 1906 -- invalid
  Olisthanella brinkmanni Sekera, 1912 -- valid
  Olisthanella caeca Sibiriakova, 1929 -- valid
  Olisthanella coeca (Silliman, 1884) -- valid
  Olisthanella elegans Nasonov, 1919 -- invalid
  Olisthanella exigua (Dorner, 1902) -- invalid
  Olisthanella halleziana (Vejdovsky, 1880) -- invalid
  Olisthanella hungarica Gelei, 1904 -- invalid
  Olisthanella iphigeniae Graff, 1905 -- invalid
  Olisthanella isaevi Nasonov, 1924 -- valid
  Olisthanella lugdunense (de Man, 1874) -- invalid
  Olisthanella luteophila Kolasa, 1981 -- valid
  Olisthanella lutheri Sekera, 1906 -- invalid
  Olisthanella multispina Beklemischev, 1924 -- valid
  Olisthanella nassonoffii (Graff, 1882) -- invalid
  Olisthanella nassonovi Sekera, 1912 -- valid
  Olisthanella obtusa (Schultze, 1851) -- valid
  Olisthanella opaca (Nasonov, 1923) -- invalid
  Olisthanella opistomiformis Nasonov, 1924 -- valid
  Olisthanella otophthalma (Plotnikow, 1906) -- invalid
  Olisthanella otophthalma tricuspidata Beklemischev, 1921 -- invalid
  Olisthanella palmeni Nasonov, 1917 -- valid
  Olisthanella palmeni palmeni Nasonov, 1917 -- valid
  Olisthanella palmeni rhynchocephala Beklemischev, 1921 -- valid
  Olisthanella parva Marcus, 1946 -- invalid
  Olisthanella petropolitana Beklemischev, 1923 -- invalid
  Olisthanella septentrionalis Nasonov, 1924 -- invalid
  Olisthanella sexmaculata (Nasonov, 1923) -- invalid
  Olisthanella splendida (Graff, 1882) -- invalid
  Olisthanella tricurata Sibiriakova, 1929 -- invalid
  Olisthanella truncula (Schmidt, 1858) -- valid
  Olisthanella truncula fusikorum Nasonov, 1929 -- valid
  Olisthanella truncula lucida Nasonov, 1926 -- valid
  Olisthanella truncula truncula (Schmidt, 1858) -- valid
  Olisthanella valaamica Nasonov, 1917 -- invalid
  Olisthanella vejdovskyi (Jaworowski, 1895) -- invalid
  Olisthanella virginiana Kepner and Carter, 1931 -- invalid
  Olisthanella virginiana glandulosa Ruebush, 1935 -- invalid
  Olisthanella virginiana virginiana Kepner and Carter, 1931 -- invalid
  Olisthanellinae Luther, 1904 -- valid
  Olisthanellinella Reisinger, 1924 -- valid
  Olisthanellinella rotundula Reisinger, 1924 -- valid
  Olisthanelliola Schwank, 1980 -- valid
  Olisthanelliola stylifera Schwank, 1980 -- valid
  Omalostomum Beneden, 1870 -- valid
  Omalostomum claparedii (Beneden, 1870) -- valid
  Omalostomum dubium de Beauchamp, 1927 -- invalid
  Omalostomum schultzei (Claparède, 1863) -- valid
  Ommatoplana Laidlaw, 1903 -- valid
  Ommatoplana akkashiensis (Kato, 1937) -- invalid
  Ommatoplana levis (Hyman, 1953) -- invalid
  Ommatoplana mexicana Hyman, 1953 -- valid
  Ommatoplana oceanica Hyman, 1955 -- invalid
  Ommatoplana tuberculata Laidlaw, 1903 -- valid
  Ommatoplea Diesing, 1862 -- invalid
  Ommatoplea armata (A. L. Dugès, 1830) -- invalid
  Oneppus Marcus, 1952 -- valid
  Oneppus denticulatus Evdonin, 1977 -- valid
  Oneppus lacus Marcus, 1954 -- valid
  Oneppus timius Marcus, 1952 -- valid
  Opisthobursa Benazzi, 1972 -- valid
  Opisthobursa josephinae Benazzi, 1975 -- valid
  Opisthobursa mexicana Benazzi, 1972 -- valid
  Opisthobursidae Benazzi and Giannini, 1973 -- invalid
  Opisthocystis Sekera, 1912 -- valid
  Opisthocystis abyssalis Timoshkin, 1986 -- valid
  Opisthocystis aleksandri Timoshkin, Zaytseva and Gutsol, 2009 -- valid
  Opisthocystis angarensis (Sibiriakova, 1929) -- valid
  Opisthocystis bilobata (Nasonov, 1935) -- valid
  Opisthocystis campanulata (Nasonov, 1935) -- valid
  Opisthocystis cariottus Timoshkin, 1986 -- valid
  Opisthocystis curvistylus Timoshkin, 1986 -- valid
  Opisthocystis drobyshevae Timoshkin, 2010 -- valid
  Opisthocystis evdonini Timoshkin, 2010 -- valid
  Opisthocystis goettei (Bresslau, 1906) -- valid
  Opisthocystis hendelbergi Timoshkin, 2010 -- valid
  Opisthocystis humilistylus Timoshkin, 2010 -- valid
  Opisthocystis igori Timoshkin, Zaytseva and Gutsol, 2009 -- valid
  Opisthocystis intersticialis Lukhnev and Timoshkin, 2014 -- valid
  Opisthocystis joffei Timoshkin, 2010 -- valid
  Opisthocystis kornilorum Timoshkin, Zaytseva and Gutsol, 2009 -- valid
  Opisthocystis kotikovae Timoshkin, 2010 -- valid
  Opisthocystis marinae Timoshkin, Gutsol and Zaytseva, 2009 -- valid
  Opisthocystis meyeri Timoshkin, Zaytseva and Gutsol, 2009 -- valid
  Opisthocystis multifidus (Nasonov, 1935) -- valid
  Opisthocystis novikovae Timoshkin, 2010 -- valid
  Opisthocystis novitzkyi Timoshkin, Zaytseva and Gutsol, 2009 -- valid
  Opisthocystis octopropagostylus Lukhnev and Timoshkin, 2014 -- valid
  Opisthocystis pedistylus Timoshkin, 1986 -- valid
  Opisthocystis riegeri Timoshkin, 2010 -- valid
  Opisthocystis sabussovi Timoshkin, 1986 -- valid
  Opisthocystis seehauseni Timoshkin, 2010 -- valid
  Opisthocystis selavinovae Timoshkin, 2010 -- valid
  Opisthocystis sokolovi Timoshkin, 2010 -- valid
  Opisthocystis stepashi Timoshkin, Zaytseva and Gutsol, 2009 -- valid
  Opisthocystis sturmbaueri Timoshkin, Zaytseva and Gutsol, 2009 -- valid
  Opisthocystis trifida (Nasonov, 1935) -- valid
  Opisthocystis trifidostylus Timoshkin, 2010 -- valid
  Opisthocystis umylinae Timoshkin, 2010 -- valid
  Opisthocystis votyakovi Timoshkin, 2010 -- valid
  Opisthocystis wilkei Timoshkin, 2010 -- valid
  Opisthocystis wilkei elegans Timoshkin, 2010 -- valid
  Opisthocystis wilkei wilkei Timoshkin, 2010 -- valid
  Opisthocystis zerbstboroffkae Timoshkin, 2010 -- valid
  Opisthogenia Palombi, 1928 -- valid
  Opisthogenia crassus (Verrill, 1892) -- invalid
  Opisthogenia tentaculata Palombi, 1928 -- valid
  Opisthogeniidae Palombi, 1928 -- valid
  Opisthogenioidea Palombi, 1928 -- valid
  Opisthoporata Reisinger, 1924 -- invalid
  Opisthoporus Minot, 1877 -- invalid
  Opisthoporus tergestina Minot, 1877 -- invalid
  Opisthoporus tergestinus Minot, 1877 -- invalid
  Opistominae Luther, 1963 -- valid
  Opistomum Schmidt, 1848 -- valid
  Opistomum arsenii Nasonov, 1917 -- valid
  Opistomum diglena (Schmarda, 1859) -- invalid
  Opistomum dimitrii Nasonov, 1919 -- valid
  Opistomum fuscum Weise, 1942 -- valid
  Opistomum immigrans Ax, 1956 -- valid
  Opistomum oculata Pereyaslawzewa, 1892 -- invalid
  Opistomum pallidum Schmidt, 1848 -- valid
  Opistomum schultzeanum (Diesing, 1862) -- invalid
  Opistomum serpentina (Dalyell, 1853) -- invalid
  Opistomum striatum Graff, 1878 -- invalid
  Opistomum tundrae Nasonov, 1923 -- valid
  Opistomum vejdovskyi Sekera, 1912 -- invalid
  Orbiculorhynchus Noldt, 1986 -- valid
  Orbiculorhynchus luebbeni Noldt, 1989 -- valid
  Orcus Uljanin, 1870 -- invalid
  Orcus venenosus Uljanin, 1870 -- invalid
  Oregoniplana Holmquist and Karling, 1972 -- valid
  Oregoniplana opisthopora Holmquist and Karling, 1972 -- valid
  Oregoniplana pantherina Sluys, 1989 -- valid
  Orthodemus Hyman, 1954 -- invalid
  Orthodemus albicollis (Graff, 1899) -- invalid
  Orthodemus indica Chaurasia, 1985 -- invalid
  Orthodemus terrestris (O. F. Müller, 1773) -- invalid
  Orthoplana Steinböck, 1932 -- valid
  Orthoplana borealis (Steinböck, 1931) -- valid
  Orthoplana bregazzii Karling, 1973 -- valid
  Orthoplana filum (Meixner, 1938) -- invalid
  Orthoplana foliacea (Meixner, 1938) -- invalid
  Orthoplana kohni Ax and Ax, 1967 -- valid
  Orthoplana lunae Meini, 2015 -- valid
  Orthoplana mediterranea Ax, 1956 -- valid
  Orthoplana porsildi (Steinböck, 1932) -- invalid
  Orthoplana sewardensis Ax and Armonies, 1990 -- valid
  Orthostomum Ehrenberg, 1831 -- invalid
  Orthostomum pellucidum Ehrenberg, 1831 -- invalid
  Orthostomum rubrocinctum Grube, 1840 -- invalid
  Orthostomum siphonophorum (Schmidt, 1852) -- valid
  Oruphiscolops Kato, 1957 -- invalid
  Oruphiscolops japonicus Kato, 1947 -- invalid
  Ostenocula Sluys, 1989 -- valid
  Ostenocula harmsi (Lehmensick, 1937) -- valid
  Othelosoma Gray, 1869 -- valid
  Othelosoma africanum (Graff, 1899) -- valid
  Othelosoma angolense (de Beauchamp, 1951) -- valid
  Othelosoma caffrum (Jameson, 1907) -- valid
  Othelosoma chinum Marcus, 1953 -- valid
  Othelosoma conyum Marcus, 1953 -- valid
  Othelosoma cylindricum (de Beauchamp, 1913) -- valid
  Othelosoma duplamaculosum Sluys and Neumann, 2017 -- valid
  Othelosoma evelinae Marcus, 1970 -- valid
  Othelosoma flavescens (Jameson, 1907) -- valid
  Othelosoma flavum Moseley, 1877 -- invalid
  Othelosoma fuscum Moseley, 1877 -- invalid
  Othelosoma gnaum Marcus, 1955 -- valid
  Othelosoma gravelyi (de Beauchamp, 1930) -- valid
  Othelosoma hepaticarum (Jameson, 1907) -- valid
  Othelosoma hirudineum (de Beauchamp, 1930) -- valid
  Othelosoma huntum Marcus, 1955 -- valid
  Othelosoma impensum Sluys and Neumann, 2017 -- valid
  Othelosoma joburgi Jones, 2004 -- valid
  Othelosoma kukkal (de Beauchamp, 1930) -- valid
  Othelosoma laticlavium Sluys and Neumann, 2017 -- valid
  Othelosoma lineaenigrum Sluys and Neumann, 2017 -- valid
  Othelosoma macrothylax (de Beauchamp, 1936) -- valid
  Othelosoma marcusi de Beauchamp, 1956 -- valid
  Othelosoma marlieri de Beauchamp, 1956 -- valid
  Othelosoma musculosum (de Beauchamp, 1930) -- valid
  Othelosoma nigrescens (Mell, 1904) -- valid
  Othelosoma notabile (Graff, 1899) -- valid
  Othelosoma nyanga Jones and Cumming, 2005 -- valid
  Othelosoma polecatum Marcus, 1953 -- valid
  Othelosoma pugum Marcus, 1953 -- valid
  Othelosoma retractile (de Beauchamp, 1930) -- valid
  Othelosoma rudebecki Marcus, 1955 -- valid
  Othelosoma saegeri Marcus, 1955 -- valid
  Othelosoma sholanum (de Beauchamp, 1930) -- valid
  Othelosoma simile Sluys and Neumann, 2017 -- valid
  Othelosoma speciosum (Graff, 1896) -- valid
  Othelosoma symondsii Gray, 1869 -- valid
  Othelosoma torquatum (de Beauchamp, 1930) -- valid
  Othelosoma voleum Marcus, 1953 -- valid
  Othelosoma wauzen Marcus, 1955 -- valid
  Otocelididae Westblad, 1948 -- valid
  Otocelis Diesing, 1862 -- valid
  Otocelis chiridotae Beklemischev, 1915 -- invalid
  Otocelis dichona Marcus, 1954 -- invalid
  Otocelis erinae Hooge and Rocha, 2006 -- valid
  Otocelis gullmarensis Westblad, 1946 -- invalid
  Otocelis luteola (Kozloff, 1965) -- valid
  Otocelis marisalba (Sabussow, 1899) -- invalid
  Otocelis phycophilus Ehlers and Dörjes, 1979 -- valid
  Otocelis rubropunctata (O. Schmidt, 1852) -- valid
  Otocelis sachalinensis Ivanov, 1952 -- valid
  Otocelis sandara Hooge and Tyler, 2003 -- valid
  Otocelis westbladi Ax, 1959 -- valid
  Otomesostoma Graff, 1882 -- valid
  Otomesostoma arovi Timoshkin, Lukhnev and Zaytseva, 2010 -- valid
  Otomesostoma auditivum (Du Plessis, 1874) -- valid
  Otomesostoma morgiensis (Du Plessis, 1876) -- invalid
  Otomesostomatidae Hofsten, 1907 -- valid
  Otoplana Du Plessis, 1889 -- valid
  Otoplana antipa An der Lan, 1964 -- valid
  Otoplana armata Ax, 1951 -- invalid
  Otoplana baltica Meixner, 1938 -- invalid
  Otoplana borealis Steinböck, 1931 -- invalid
  Otoplana bosporana Ax, 1959 -- valid
  Otoplana chapuisi Graff, 1893 -- invalid
  Otoplana circinnata (Calandruccio, 1897) -- invalid
  Otoplana falcataspina Meini, 2013 -- valid
  Otoplana filum Meixner, 1938 -- invalid
  Otoplana fluviatilis Gieysztor, 1938 -- invalid
  Otoplana foliacea Meixner, 1938 -- invalid
  Otoplana glandulosa Ax, 1951 -- invalid
  Otoplana helgolandica Meixner, 1938 -- invalid
  Otoplana intermedia Du Plessis, 1889 -- valid
  Otoplana labronica Meini, 2013 -- valid
  Otoplana maculata Steinböck, 1931 -- invalid
  Otoplana oxyspina Lanfranchi and Melai, 2007 -- valid
  Otoplana proxima Lanfranchi and Melai, 2010 -- valid
  Otoplana schulzi (Ax, 1951) -- invalid
  Otoplana setosus (Du Plessis, 1889) -- valid
  Otoplana sicula (Calandruccio, 1897) -- invalid
  Otoplana subterranea Ax, 1951 -- invalid
  Otoplana truncaspina Lanfranchi, 1969 -- valid
  Otoplanella Ax, 1956 -- valid
  Otoplanella baltica (Meixner, 1938) -- valid
  Otoplanella schulzi (Ax, 1951) -- valid
  Otoplanidae Hallez, 1892 -- valid
  Otoplanidia Meixner, 1938 -- valid
  Otoplanidia endocystis Meixner, 1938 -- valid
  Otoplaninae Hallez, 1892 -- valid
  Oxyposthia Ivanov, 1952 -- valid
  Oxyposthia praedator Ivanov, 1952 -- valid
  Oxyposthia praedator praedator Ivanov, 1952 -- valid
  Oxyposthia praedator rufa Ivanov, 1952 -- valid
  Ozametra Marcus, 1949 -- valid
  Ozametra arbora (Ozaki, 1932) -- valid
  Ozametra elegans Westblad, 1953 -- invalid
  Ozametra striata Hickman, 1955 -- invalid
  Pachyplana Stimpson, 1857 -- invalid
  Pachyplana lactea Stimpson, 1857 -- invalid
  Pacifides Holmquist and Karling, 1972 -- valid
  Pacifides gladiatoris Sluys, 1989 -- valid
  Pacifides psammophilus Holmquist and Karling, 1972 -- valid
  Paedomecynostomum Dörjes, 1968 -- valid
  Paedomecynostomum bruneum Dörjes, 1968 -- valid
  Paedomecynostomum psammophilum (Beklemischev, 1957) -- invalid
  Palaeodendrocoelum Codreanu, 1949 -- invalid
  Palaeodendrocoelum danubialis Codreanu, 1951 -- invalid
  Palaeodendrocoelum geticum (Codreanu and Balcesco, 1970) -- invalid
  Palaeodendrocoelum ingulensis Dyganova and Bortcevich, 1983 -- invalid
  Palaeodendrocoelum romanodanubialis Codreanu, 1949 -- invalid
  Palaua Faubel, 1983 -- valid
  Palaua tropica (Hyman, 1959) -- valid
  Palauidae Faubel, 1983 -- valid
  Palladia Evdonin, 1977 -- valid
  Palladia nigrescens (Evdonin, 1971) -- valid
  Palmenia Luther, 1912 -- invalid
  Palmenia tvaerminnensis Luther, 1912 -- invalid
  Palmeniola Forsius, 1925 -- invalid
  Palmeniola tvaerminnensis (Luther, 1912) -- invalid
  Palombiella Westblad, 1952 -- valid
  Palombiella macquari Nurse, 1964 -- invalid
  Palombiella stephensoni (Palombi, 1938) -- valid
  Palombiellinae Sluys, 1989 -- valid
  Paludicola Hallez, 1892 -- invalid
  Papia Karling, 1956 -- valid
  Papia bifida Karling, 1956 -- valid
  Papiella Mack-Fira, 1970 -- valid
  Papiella otophthalma (Plotnikow, 1906) -- valid
  Papilloplana Kenk, 1974 -- valid
  Papilloplana grisea (Sabussow, 1903) -- valid
  Papilloplana leucocephala (Sabussow, 1903) -- valid
  Papilloplana papillosa (Korotneff, 1912) -- valid
  Papilloplana zebra Kenk, 1974 -- valid
  Paraba Carbayo, Alvarez-Presas, Olivares, Marques, E. M. Froehlich and Riutort, 2013 -- valid
  Paraba caapora (C. G. Froehlich, 1957) -- valid
  Paraba cassula (E. M. Froehlich, 1955) -- valid
  Paraba franciscana (Leal-Zanchet and Carbayo, 2001) -- valid
  Paraba gaucha (C. G. Froehlich, 1959) -- valid
  Paraba goettei (Schirch, 1929) -- valid
  Paraba incognita (Riester, 1938) -- valid
  Paraba multicolor (Graff, 1899) -- valid
  Paraba phocaica (Marcus, 1951) -- valid
  Paraba piriana (Almeida and Carbayo, 2012) -- valid
  Paraba preta (Riester, 1938) -- valid
  Paraba rubidolineata (Baptista and Leal-Zanchet, 2005) -- valid
  Paraba suva (C. G. Froehlich, 1959) -- valid
  Paraba tapira (C. G. Froehlich, 1957) -- valid
  Paraba tingauna (Kishimoto and Carbayo, 2012) -- valid
  Paraboninia Prudhoe, 1944 -- valid
  Paraboninia caymanensis Prudhoe, 1944 -- valid
  Parabyrsophlebs Karling, 1985 -- valid
  Parabyrsophlebs coeca (Luther, 1948) -- valid
  Paracalviria Schockaert, Curini-Galletti, De Ridder and Artois, 2011 -- valid
  Paracalviria islandica Schockaert, Curini-Galletti, De Ridder and Artois, 2011 -- valid
  Paracaridinicola Baer, 1953 -- valid
  Paracaridinicola indica (Annandale, 1912) -- valid
  Paracaridinicolinae Baer, 1953 -- valid
  Paracatenula Sterrer and Rieger, 1974 -- valid
  Paracatenula erato Sterrer and Rieger, 1974 -- valid
  Paracatenula galateia Dirks, Gruber-Vodicka, Leisch, Sterrer and Ott, 2011 -- valid
  Paracatenula kalliope Sterrer and Rieger, 1974 -- valid
  Paracatenula polyhymnia Sterrer and Rieger, 1974 -- valid
  Paracatenula urania Sterrer and Rieger, 1974 -- valid
  Parachrorhynchus Karling, 1956 -- valid
  Parachrorhynchus axi Karling, 1956 -- valid
  Parachrorhynchus bergensis Karling, 1956 -- valid
  Parachrorhynchus jondelii Artois and Schockaert, 2001 -- valid
  Paracicerina Meixner, 1928 -- valid
  Paracicerina deltoides Martens and Schockaert, 1981 -- valid
  Paracicerina elegans Evdonin, 1971 -- invalid
  Paracicerina globulosa Brunet, 1973 -- valid
  Paracicerina laboeica Meixner, 1928 -- valid
  Paracicerina maristoi Karling, 1952 -- valid
  Paraconvoluta Westblad, 1946 -- invalid
  Paraconvoluta diversicolor (Ĝrsted, 1845) -- invalid
  Paraconvoluta virescens (Ĝrsted, 1845) -- invalid
  Paractinoposthia Ehlers and Dörjes, 1981 -- valid
  Paractinoposthia pseudovesicula (Ehlers and Dörjes, 1979) -- valid
  Paradendrocoelum Kenk, 1930 -- invalid
  Paradendrocoelum abditum Kenk, 1940 -- invalid
  Paradendrocoelum alexandrinae (Codreanu and Balcesco, 1970) -- invalid
  Paradendrocoelum carpathicum (Komarek, 1926) -- invalid
  Paradendrocoelum cavatica (Fries, 1874) -- invalid
  Paradendrocoelum cavatica sollaudi (de Beauchamp, 1931) -- invalid
  Paradendrocoelum hankoi (Gelei, 1927) -- invalid
  Paradendrocoelum hercynicum (Flossner, 1959) -- invalid
  Paradendrocoelum infernale (Steinmann, 1907) -- invalid
  Paradendrocoelum longipenis (Komarek, 1916) -- invalid
  Paradendrocoelum sollaudi (de Beauchamp, 1931) -- invalid
  Paradendrocoelum spelaeum (Kenk, 1924) -- invalid
  Paradendrocoelum tubuliferum (de Beauchamp, 1919) -- invalid
  Paradendrocoelum voinovi (Codreanu, 1929) -- invalid
  Paradoxoplana Ax, 1956 -- valid
  Paradoxoplana solida Ax, 1956 -- valid
  Paraeodendrocoelum Kenk, 1930 -- invalid
  Parafallacohospes Shinn, 1987 -- valid
  Parafallacohospes bransfieldensis Shinn, 1987 -- valid
  Paragnathorhynchus Meixner, 1938 -- valid
  Paragnathorhynchus subterraneus Meixner, 1938 -- valid
  Parahaplodiscus An der Lan, 1936 -- invalid
  Parahaplodiscus ruber An der Lan, 1936 -- invalid
  Parahaplogonaria Dörjes, 1968 -- valid
  Parahaplogonaria maxima Dörjes, 1968 -- valid
  Parahaploposthia Dörjes, 1968 -- valid
  Parahaploposthia avesicula Dörjes, 1968 -- valid
  Parahaploposthia brunea Faubel, 1976 -- valid
  Parahaploposthia cerebroepitheliata Dörjes, 1968 -- valid
  Parahaploposthia gracilis Faubel, 1977 -- invalid
  Parahaploposthia longituba Hooge and Tyler, 2007 -- valid
  Parahaploposthia thiophilus Fegley, Smith and Rieger, 1984 -- valid
  Parahaploposthia velvetum Hooge and Tyler, 2002 -- valid
  Parainvenusta Curini-Galletti, 2010 -- valid
  Parainvenusta englarorum Curini-Galletti, 2010 -- valid
  Parakontikia Winsor, 1991 -- valid
  Parakontikia atrata (Steel, 1897) -- valid
  Parakontikia chapmani (Ogren and Kawakatsu, 1988) -- valid
  Parakontikia coxii (Fletcher and Hamilton, 1888) -- valid
  Parakontikia lyra (Steel, 1900) -- valid
  Parakontikia melanochroa (Steel, 1901) -- valid
  Parakontikia ventrolineata (Dendy, 1892) -- invalid
  Paramacrostomum Riedel, 1932 -- valid
  Paramacrostomum quiesztoria (Bedini and Papi, 1970) -- invalid
  Paramacrostomum tricladoides Riedel, 1932 -- valid
  Paramalostomum Ax, 1951 -- invalid
  Paramecynostomum Dörjes, 1968 -- valid
  Paramecynostomum carchedonium Kozloff, 1998 -- valid
  Paramecynostomum diversicolor (Ĝrsted, 1845) -- valid
  Paramesostoma Attems, 1896 -- valid
  Paramesostoma helgolandicum Ax, 1959 -- valid
  Paramesostoma neapolitanum (Graff, 1882) -- valid
  Paramesostoma pachydermum (Pereyaslawzewa, 1892) -- invalid
  Paramesostominae Luther, 1948 -- valid
  Paramonotus Meixner, 1938 -- valid
  Paramonotus hamatus (Jensen, 1878) -- valid
  Paramyozonaria Rieger, 1971 -- valid
  Paramyozonaria bermudense Sopott-Ehlers and Schmidt, 1974 -- invalid
  Paramyozonaria bermudensis Rieger, 1971 -- valid
  Paramyozonaria bruneti Rieger, 1971 -- invalid
  Paramyozonaria riegeri Sopott-Ehlers and Schmidt, 1974 -- valid
  Paramyozonaria rosacea Tyler, 1975 -- invalid
  Paramyozonaria simplex Rieger and Tyler, 1974 -- valid
  Paranandroplana Prudhoe, 1985 -- invalid
  Paranandroplana portoricensis (Hyman, 1955) -- invalid
  Paranaperus Westblad, 1942 -- invalid
  Paranaperus pellucidus Westblad, 1942 -- invalid
  Paranotothrix Cannon, 1982 -- valid
  Paranotothrix queenslandicus Cannon, 1982 -- valid
  Paraphanostoma Westblad, 1942 -- invalid
  Paraphanostoma brachyposthium Westblad, 1942 -- invalid
  Paraphanostoma crassum Westblad, 1942 -- invalid
  Paraphanostoma cycloposthium Westblad, 1942 -- invalid
  Paraphanostoma dubium Westblad, 1942 -- invalid
  Paraphanostoma etium Marcus, 1954 -- invalid
  Paraphanostoma gracilis Westblad, 1945 -- invalid
  Paraphanostoma leptoposthium Riedl, 1956 -- invalid
  Paraphanostoma macroposthium (Steinböck, 1931) -- invalid
  Paraphanostoma submaculatum Westblad, 1942 -- invalid
  Paraphanostoma trianguliferum Westblad, 1942 -- invalid
  Paraphanostoma westbladi Marcus, 1950 -- invalid
  Parapharyngiella Willems, Artois, Vermin, Backeljau and Schockaert, 2005 -- valid
  Parapharyngiella involucrum Willems, Artois, Vermin, Backeljau and Schockaert, 2005 -- valid
  Paraplana Ax, 1956 -- valid
  Paraplana biscayensis Ax, 1956 -- valid
  Paraplanaria Ball and Gourbault, 1978 -- valid
  Paraplanaria dactyligera (Kenk, 1935) -- valid
  Paraplanaria occulta (Kenk, 1969) -- valid
  Paraplanocera Laidlaw, 1902 -- valid
  Paraplanocera aurora Laidlaw, 1903 -- valid
  Paraplanocera discus (Willey, 1897) -- valid
  Paraplanocera fritillata Hyman, 1959 -- valid
  Paraplanocera laidlawi Jacubowa, 1906 -- invalid
  Paraplanocera langi (Laidlaw, 1902) -- invalid
  Paraplanocera langii (Laidlaw, 1902) -- valid
  Paraplanocera marginata Meyer, 1922 -- valid
  Paraplanocera misakiensis Yeri and Kaburaki, 1918 -- valid
  Paraplanocera oceanica (Hyman, 1953) -- valid
  Paraplanocera oligoglena (Schmarda, 1859) -- valid
  Paraplanocera rotumanensis Laidlaw, 1903 -- valid
  Paraplanocera rubrifasciata Kato, 1937 -- valid
  Paraplehnia Bock, 1923 -- invalid
  Paraplehnia Hyman, 1953 -- invalid
  Paraplehnia japonica (Bock, 1923) -- invalid
  Paraplehnia pacifica (Kato, 1939) -- invalid
  Paraproboscifer De Clerck, 1994 -- valid
  Paraproboscifer alacerregis De Clerck, 1994 -- valid
  Paraproporus Westblad, 1945 -- valid
  Paraproporus diovatus Dörjes, 1968 -- valid
  Paraproporus elegans (An der Lan, 1936) -- valid
  Paraproporus rosettiformis Faubel, 1974 -- valid
  Paraproporus rubescens Westblad, 1945 -- valid
  Paraproporus tinctus Marcus, 1952 -- invalid
  Paraproporus xanthus Marcus, 1950 -- valid
  Paraprostatum Faubel and Sluys, 2007 -- valid
  Paraprostatum echinolittorinae Faubel and Sluys, 2007 -- valid
  Pararhynchella Ehlers and Ehlers, 1981 -- valid
  Pararhynchella fusca Ehlers and Ehlers, 1981 -- valid
  Paraschizorhynchoides Schilke, 1970 -- valid
  Paraschizorhynchoides glandulis Schilke, 1970 -- valid
  Paraschizorhynchoides glandulis glandulis Schilke, 1970 -- valid
  Paraschizorhynchoides glandulis hopkinsi Karling, 1989 -- valid
  Paraschizorhynchus Meixner, 1938 -- invalid
  Paraschizorhynchus arenarius Meixner, 1938 -- invalid
  Paraschizorhynchus mirabilis Meixner, 1938 -- invalid
  Parastylochus Bock, 1913 -- valid
  Parastylochus astis Bock, 1913 -- valid
  Parastylostomum Faubel, 1984 -- valid
  Parastylostomum hozawai (Kato, 1939) -- valid
  Parastylostomum maculatum (Kato, 1944) -- valid
  Paratenerrhynchus Brunet, 1972 -- valid
  Paratenerrhynchus triplex Brunet, 1972 -- valid
  Parathylacorhynchus Dean, 1980 -- valid
  Parathylacorhynchus reidi Dean, 1980 -- valid
  Paratomella Dörjes, 1966 -- valid
  Paratomella rubra Rieger and Ott, 1971 -- valid
  Paratomella unichaeta Dörjes, 1966 -- valid
  Paratomellidae Dörjes, 1966 -- valid
  Paraustrorhynchus Karling and Schockaert, 1977 -- valid
  Paraustrorhynchus caligatus Willems, Schockaert and Artois, 2006 -- valid
  Paraustrorhynchus elixus (Marcus, 1954) -- valid
  Paraustrorhynchus neleae Artois and Tessens, 2008 -- valid
  Paraustrorhynchus pacificus Karling and Schockaert, 1977 -- valid
  Parautelga Karling, 1964 -- valid
  Parautelga bilioi Karling, 1964 -- valid
  Parautelga kielensis Ax, 1960 -- invalid
  Paravortex Wahl, 1906 -- valid
  Paravortex cardii Hallez, 1908 -- valid
  Paravortex gemellipara (Linton, 1910) -- valid
  Paravortex karlingi Pike and Burt, 1981 -- valid
  Paravortex mesodesma Brusa, Ponce de Leon and Damborenea, 2006 -- valid
  Paravortex nicolli Szidat, 1965 -- valid
  Paravortex panopea Brusa, Vazquez and Cremonte, 2011 -- valid
  Paravortex scrobiculariae (Graff, 1882) -- valid
  Paravortex tapetis Noury-Srairi, 1989 -- valid
  Pareurylepta Faubel, 1984 -- valid
  Pareurylepta punctata (Kaburaki, 1923) -- valid
  Pareurylepta wandeli (Hallez, 1907) -- valid
  Paromalostomum Ax, 1951 -- valid
  Paromalostomum atratum Rieger, 1971 -- valid
  Paromalostomum coronum Spurr, 1983 -- valid
  Paromalostomum dubium (de Beauchamp, 1927) -- valid
  Paromalostomum fusculum Ax, 1952 -- valid
  Paromalostomum massiliensis Rieger, 1971 -- valid
  Paromalostomum mediterraneum Ax, 1955 -- invalid
  Paromalostomum minutum Rieger, 1971 -- valid
  Paromalostomum minuum Rieger, 1971 -- invalid
  Paromalostomum notandum Ax, 1951 -- invalid
  Paromalostomum parvum Rieger, 1971 -- valid
  Paromalostomum proceracauda Pawlak, 1969 -- valid
  Paromalostomum scilliensis Faubel and Warwick, 2005 -- valid
  Paromalostomum spiralis Ax, 1952 -- invalid
  Paromalostomum subflavum Sopott-Ehlers and Schmidt, 1974 -- valid
  Parotocelis Kozloff, 1965 -- invalid
  Parotocelis Ehlers and Dörjes, 1979 -- invalid
  Parotocelis luteola Kozloff, 1965 -- invalid
  Parotocelis luteopunctata Ehlers and Dörjes, 1979 -- invalid
  Parotoplana Meixner, 1938 -- valid
  Parotoplana ambrosolii Curini-Galletti and Delogu, 2014 -- valid
  Parotoplana axi Delogu and Curini-Galletti, 2009 -- valid
  Parotoplana bermudensis Ax and Sopott-Ehlers, 1987 -- valid
  Parotoplana bicupa Sopott-Ehlers, 1976 -- valid
  Parotoplana capitata Meixner, 1938 -- valid
  Parotoplana carthagoensis Delogu and Curini-Galletti, 2009 -- valid
  Parotoplana circinnata (Calandruccio, 1897) -- valid
  Parotoplana crassispina Delogu and Curini-Galletti, 2009 -- valid
  Parotoplana cucullata Delogu, Casu and Curini-Galletti, 2008 -- valid
  Parotoplana fretigaditani Delogu, Casu and Curini-Galletti, 2008 -- valid
  Parotoplana geminispina Delogu and Curini-Galletti, 2009 -- valid
  Parotoplana gracilispina Delogu and Curini-Galletti, 2009 -- valid
  Parotoplana ichnusae Delogu and Curini-Galletti, 2009 -- valid
  Parotoplana impastatoi Curini-Galletti and Delogu, 2014 -- valid
  Parotoplana jondelii Delogu and Curini-Galletti, 2007 -- valid
  Parotoplana lata Ax and Sopott-Ehlers, 1987 -- valid
  Parotoplana livatinoi Curini-Galletti and Delogu, 2014 -- valid
  Parotoplana macrostyla Lanfranchi, 1978 -- valid
  Parotoplana mastigophora Delogu, Casu and Curini-Galletti, 2008 -- valid
  Parotoplana mollis Ax and Sopott-Ehlers, 1987 -- valid
  Parotoplana moya Marcus, 1949 -- valid
  Parotoplana multispinosa Ax, 1956 -- valid
  Parotoplana obtusispina Delogu and Curini-Galletti, 2009 -- valid
  Parotoplana pacifica Ax and Ax, 1967 -- valid
  Parotoplana papii Ax, 1956 -- valid
  Parotoplana primitiva Ax, 1956 -- valid
  Parotoplana procerostyla Ax, 1956 -- valid
  Parotoplana pulchrispina Delogu and Curini-Galletti, 2009 -- valid
  Parotoplana pythagorae Delogu and Curini-Galletti, 2007 -- valid
  Parotoplana renatae Ax, 1956 -- valid
  Parotoplana rosignana Lanfranchi and Melai, 2008 -- valid
  Parotoplana spathifera Delogu and Curini-Galletti, 2007 -- valid
  Parotoplana subtilis Ax and Sopott-Ehlers, 1987 -- valid
  Parotoplana terpsichore Delogu and Curini-Galletti, 2007 -- valid
  Parotoplana truncaspina (Lanfranchi, 1969) -- invalid
  Parotoplana tubifera Curini-Galletti and Delogu, 2014 -- valid
  Parotoplana turgida Ax and Ax, 1974 -- valid
  Parotoplana uncinata Lanfranchi, 1978 -- valid
  Parotoplana varispinosa Delogu, Casu and Curini-Galletti, 2008 -- valid
  Parotoplanella Ax, 1956 -- valid
  Parotoplanella heterorhabditica Lanfranchi, 1969 -- valid
  Parotoplanella progermaria Ax, 1956 -- valid
  Parotoplanina Ax, 1956 -- valid
  Parotoplanina antaliformis Curini-Galletti, 2014 -- valid
  Parotoplanina geminoducta Ax, 1956 -- valid
  Parotoplaninae Ax, 1956 -- valid
  Parviplana Hyman, 1953 -- valid
  Parviplana californica (Woodworth, 1894) -- invalid
  Parviplana hymani Faubel, 1983 -- valid
  Parviplana lynca (Du Bois-Reymond Marcus, 1958) -- valid
  Pasipha Ogren and Kawakatsu, 1990 -- valid
  Pasipha aphalla (Hyman, 1941) -- valid
  Pasipha astraea (Marcus, 1951) -- valid
  Pasipha atla Negrete and Brusa, 2016 -- valid
  Pasipha backesi Leal-Zanchet, Rossi and Seitenfus, 2012 -- valid
  Pasipha biseminalis (Riester, 1938) -- invalid
  Pasipha brevilineata Leal-Zanchet, Rossi and Alvarenga, 2012 -- valid
  Pasipha caeruleonigra (Riester, 1938) -- valid
  Pasipha cafusa (C. G. Froehlich, 1956) -- valid
  Pasipha chilensis (Graff, 1899) -- valid
  Pasipha chimbeva (E. M. Froehlich, 1955) -- valid
  Pasipha diminutiva (Hyman, 1955) -- valid
  Pasipha ercilla (E. M. Froehlich, 1978) -- valid
  Pasipha hauseri (C. G. Froehlich, 1959) -- valid
  Pasipha johnsoni Negrete and Brusa, 2016 -- valid
  Pasipha mbya Negrete and Brusa, 2016 -- valid
  Pasipha oliverioi (C. G. Froehlich, 1955) -- valid
  Pasipha pasipha (Marcus, 1951) -- valid
  Pasipha penhana (Riester, 1938) -- valid
  Pasipha pinima (E. M. Froehlich, 1955) -- valid
  Pasipha plana (Schirch, 1929) -- valid
  Pasipha pulchella (Schultze and F. Müller, 1857) -- valid
  Pasipha rosea (E. M. Froehlich, 1955) -- valid
  Pasipha splendida (Graff, 1899) -- valid
  Pasipha tapetilla (Marcus, 1951) -- valid
  Pasipha trina (Marcus, 1951) -- invalid
  Pasipha velina (C. G. Froehlich, 1959) -- valid
  Pasipha velutina (Riester, 1938) -- valid
  Pasipha weyrauchi (Du Bois-Reymond Marcus, 1951) -- valid
  Paucumara Sluys, 1989 -- valid
  Paucumara trigonocephala (Ijima and Kaburaki, 1916) -- valid
  Paulodora Marcus, 1948 -- valid
  Paulodora ancora Artois and Tessens, 2008 -- valid
  Paulodora asymmetrica Artois and Schockaert, 2001 -- valid
  Paulodora contorta (Schockaert and Karling, 1975) -- valid
  Paulodora contortoides Artois and Tessens, 2008 -- valid
  Paulodora dolichocephala (Pereyaslawzewa, 1892) -- valid
  Paulodora drepanophora Artois and Tessens, 2008 -- valid
  Paulodora felis (Marcus, 1954) -- valid
  Paulodora felis asymmetrica Artois and Schockaert, 2001 -- invalid
  Paulodora felis felis (Marcus, 1954) -- valid
  Paulodora fredelyna (Marcus, 1948) -- valid
  Paulodora hamifer Artois and Tessens, 2008 -- valid
  Paulodora matarazzoi Marcus, 1948 -- valid
  Paulodora porcellus Artois and Tessens, 2008 -- valid
  Paulodora riedli (Karling, 1956) -- valid
  Paulodora schockaerti Artois and Tessens, 2008 -- valid
  Paulodora subcontorta (Schockaert, 1982) -- valid
  Paulodora watsoni Artois and Tessens, 2008 -- valid
  Peasea Marschall, 1873 -- invalid
  Peasea inconspicua (Pease, 1860) -- invalid
  Peasea irrorata (Pease, 1860) -- invalid
  Peasea maculata (Pease, 1860) -- invalid
  Peasea reticulata (Gray, 1860) -- invalid
  Peasea tentaculata (Pease, 1860) -- invalid
  Peasia Gray and Pease, 1860 -- invalid
  Peasia inconspicua Pease, 1860 -- invalid
  Peasia irrorata Pease, 1860 -- invalid
  Peasia maculata Pease, 1860 -- invalid
  Peasia reticulata Gray, 1860 -- invalid
  Peasia tentaculata Pease, 1860 -- invalid
  Pelagoplana Bock, 1913 -- invalid
  Pelagoplana sargassicola (Mertens, 1833) -- invalid
  Pelmatoplana Graff, 1896 -- valid
  Pelmatoplana aurantia Whitehouse, 1914 -- invalid
  Pelmatoplana bangoiana de Beauchamp, 1939 -- invalid
  Pelmatoplana blomefieldi Graff, 1899 -- invalid
  Pelmatoplana bogoriensis Graff, 1899 -- valid
  Pelmatoplana braueri (Graff, 1899) -- valid
  Pelmatoplana buettneri Graff, 1899 -- invalid
  Pelmatoplana coonoorensis de Beauchamp, 1930 -- invalid
  Pelmatoplana crassus de Beauchamp, 1939 -- invalid
  Pelmatoplana dawydoffi de Beauchamp, 1939 -- invalid
  Pelmatoplana glandulosa de Beauchamp, 1925 -- invalid
  Pelmatoplana graffi Fuhrmann, 1912 -- valid
  Pelmatoplana greeni Graff, 1899 -- invalid
  Pelmatoplana guentheri Graff, 1899 -- invalid
  Pelmatoplana himalayensis Whitehouse, 1919 -- invalid
  Pelmatoplana humberti Graff, 1899 -- invalid
  Pelmatoplana ijimai Graff, 1899 -- invalid
  Pelmatoplana indosinicus de Beauchamp, 1939 -- invalid
  Pelmatoplana inflata Graff, 1899 -- invalid
  Pelmatoplana japonica (Kaburaki, 1922) -- invalid
  Pelmatoplana kotzebueana Schröder, 1924 -- invalid
  Pelmatoplana maculosa Whitehouse, 1919 -- invalid
  Pelmatoplana maheensis (Graff, 1899) -- valid
  Pelmatoplana martensi Graff, 1899 -- invalid
  Pelmatoplana moluccana Graff, 1899 -- valid
  Pelmatoplana nilgiriensis (Whitehouse, 1919) -- invalid
  Pelmatoplana pseudophallus de Beauchamp, 1939 -- valid
  Pelmatoplana rotunda Whitehouse, 1919 -- invalid
  Pelmatoplana sarasinorum Graff, 1899 -- invalid
  Pelmatoplana sondaica (Loman, 1890) -- invalid
  Pelmatoplana striata Whitehouse, 1919 -- invalid
  Pelmatoplana treubi Graff, 1899 -- invalid
  Pelmatoplana trimeni Graff, 1899 -- invalid
  Pelmatoplana willeyi Busson, 1903 -- invalid
  Pelmatoplaninae Ogren and Kawakatsu, 1991 -- invalid
  Pelmatoplaninini Ogren and Kawakatsu, 1991 -- valid
  Pelophila Dörjes, 1968 -- valid
  Pelophila cavernosa Dörjes, 1968 -- invalid
  Pelophila lutheri (Westblad, 1946) -- valid
  Pelophila pachymorpha Dörjes, 1968 -- valid
  Penecurva Livanov and Zabusova, 1940 -- invalid
  Penecurva albata Ichikawa and Kawakatsu, 1962 -- invalid
  Penecurva fontinalis (Sabussow, 1903) -- invalid
  Penecurva iwamai (Ichikawa and Kawakatsu, 1962) -- invalid
  Penecurva mesorchis Livanov and Zabusova, 1940 -- invalid
  Penecurva mesorchis praeputialis Livanov and Zabusova, 1940 -- invalid
  Penecurva sibirica (Sabussow, 1903) -- invalid
  Penecurva teletzkiana Livanov and Zabusova, 1940 -- invalid
  Penecurva teletzkiana longopharyngea Livanov and Zabusova, 1940 -- invalid
  Penecurva vivida (Ijima and Kaburaki, 1916) -- invalid
  Pentacoelidae Luther, 1961 -- invalid
  Pentacoelum Westblad, 1935 -- valid
  Pentacoelum caspium Beklemischev, 1954 -- invalid
  Pentacoelum fucoideum Westblad, 1935 -- valid
  Pentacoelum hispaniensis Sluys, 1989 -- valid
  Pentacoelum kazukolinda (Kawakatsu and Mitchell, 1984) -- valid
  Pentacoelum punctatum (Brandtner, 1935) -- valid
  Pentaplana Marcus, 1949 -- valid
  Pentaplana divae Marcus, 1949 -- valid
  Penula Kelaart, 1858 -- invalid
  Penula alba Kelaart, 1858 -- invalid
  Penula fulva Kelaart, 1858 -- invalid
  Penula ocellata Kelaart, 1858 -- invalid
  Penula punctata Kelaart, 1858 -- invalid
  Peraclistus Steinböck, 1932 -- valid
  Peraclistus bathycolus (Steinböck, 1932) -- invalid
  Peraclistus itaipus Marcus, 1950 -- valid
  Peraclistus itaipus Westblad, 1952 -- invalid
  Peraclistus oophagus (Friedmann, 1924) -- valid
  Peraclistus prostenopharynx (Steinböck, 1932) -- invalid
  Peraclistus stimula (Ax and Ax, 1977) -- valid
  Peraclistus westbladi (Karling, 1967) -- invalid
  Perandropora Reisinger, 1924 -- valid
  Perandropora macroposthia Reisinger, 1924 -- valid
  Pericelidae Laidlaw, 1902 -- valid
  Pericelididae Laidlaw, 1902 -- invalid
  Pericelis Laidlaw, 1902 -- valid
  Pericelis beyerleyana (Collingwood, 1876) -- invalid
  Pericelis byerleyana (Collingwood, 1876) -- valid
  Pericelis cata Marcus and Marcus, 1968 -- valid
  Pericelis ernesti (Hyman, 1953) -- invalid
  Pericelis hymanae Poulter, 1974 -- valid
  Pericelis orbicularia (Schmarda, 1859) -- valid
  Pericelis orbicularis (Schmarda, 1859) -- invalid
  Permatoplana Kawakatsu and Basil, 1971 -- invalid
  Perocephalus Graff, 1896 -- invalid
  Perocephalus hilgendorfi Graff, 1896 -- invalid
  Perocephalus ravenalae Graff, 1899 -- invalid
  Perocephalus ravenalae bimaculata Graff, 1899 -- invalid
  Perocephalus sikorai Graff, 1899 -- invalid
  Perocephalus tamatavensis Graff, 1899 -- invalid
  Persica Maghsoudlou, Bulnes and Rahimian, 2015 -- valid
  Persica qeshmensis Maghsoudlou, Bulnes and Rahimian, 2015 -- valid
  Petaliella Ehlers, 1974 -- valid
  Petaliella spiracauda Ehlers, 1974 -- valid
  Phaenocelis Stummer-Traunfels, 1933 -- valid
  Phaenocelis insularis (Hyman, 1944) -- invalid
  Phaenocelis medvedica Marcus, 1952 -- valid
  Phaenocelis mexicana Hyman, 1953 -- invalid
  Phaenocelis peleca Marcus and Marcus, 1968 -- invalid
  Phaenocelis purpurea (Schmarda, 1859) -- valid
  Phaenocora Ehrenberg, 1837 -- valid
  Phaenocora (Megaloderostoma) Beklemischev, 1929 -- invalid
  Phaenocora (Pseudophaenocora) Gilbert, 1938 -- invalid
  Phaenocora achaeorum Nasonov, 1919 -- valid
  Phaenocora adenticulata Gilbert, 1938 -- valid
  Phaenocora agassizi Graff, 1911 -- invalid
  Phaenocora aglobulata Houben, Van Steenkiste and Artois, 2014 -- valid
  Phaenocora alticola Ruebush, 1939 -- valid
  Phaenocora anomalocoela (Haswell, 1905) -- valid
  Phaenocora anophthalma (Vejdovsky, 1895) -- valid
  Phaenocora baltica (Braun, 1885) -- invalid
  Phaenocora beauchampi Sekera, 1930 -- invalid
  Phaenocora bresslaui Marcus, 1946 -- valid
  Phaenocora brincki Marcus and Marcus, 1959 -- valid
  Phaenocora chappuisi de Beauchamp, 1936 -- invalid
  Phaenocora chloroxantha Marcus, 1946 -- valid
  Phaenocora clavigera Hofsten, 1907 -- valid
  Phaenocora coecum (Fuhrmann, 1894) -- invalid
  Phaenocora cucurbitina Beklemischev, 1919 -- valid
  Phaenocora evelinae Marcus, 1946 -- valid
  Phaenocora falciodenticulata Gilbert, 1938 -- valid
  Phaenocora foliacea (Böhmig, 1914) -- valid
  Phaenocora gagarini Korgina, 2014 -- valid
  Phaenocora galiziana (Schmidt, 1858) -- valid
  Phaenocora gilberti Houben, Van Steenkiste and Artois, 2014 -- valid
  Phaenocora gilberti Houben and Artois, 2015 -- valid
  Phaenocora gracilis (Vejdovsky, 1895) -- valid
  Phaenocora highlandense Gilbert, 1935 -- valid
  Phaenocora jucunda Cognetti de Martiis, 1914 -- invalid
  Phaenocora kepneri Gilbert, 1935 -- valid
  Phaenocora lutheri Gilbert, 1937 -- valid
  Phaenocora megacephala (Higley, 1918) -- invalid
  Phaenocora megalops (A. L. Dugès, 1830) -- invalid
  Phaenocora polycirra (Beklemischev, 1929) -- valid
  Phaenocora rufodorsata (Sekera, 1903) -- valid
  Phaenocora salinarum (Graff, 1882) -- valid
  Phaenocora salinarum salinarum (Graff, 1882) -- valid
  Phaenocora salinarum subsalsa Beklemischev, 1927 -- valid
  Phaenocora sinensis Wang and Sun, 2011 -- valid
  Phaenocora stagnalis (Fuhrmann, 1900) -- invalid
  Phaenocora subsalina Luther, 1921 -- invalid
  Phaenocora sulfophila (Gilbert, 1938) -- invalid
  Phaenocora typhlops (Vejdovsky, 1880) -- valid
  Phaenocora typhlops subsalina Luther, 1921 -- invalid
  Phaenocora unipunctata (Ĝrsted, 1843) -- valid
  Phaenocora variodentata Meixner, 1915 -- valid
  Phaenocora vejdovskyi (Vejdovsky, 1895) -- invalid
  Phaenocora virginiana Gilbert, 1935 -- valid
  Phaenocora vjatkensis Nasonov, 1919 -- valid
  Phaenocorinae Wahl, 1910 -- valid
  Phaenoplana Faubel, 1983 -- valid
  Phaenoplana challengeri (Graff, 1892) -- valid
  Phaenoplana conoceraea (Schmarda, 1859) -- valid
  Phaenoplana longipenis (Hyman, 1953) -- valid
  Phaenoplana peleca (Marcus and Marcus, 1968) -- valid
  Phaenoplana taiwanica (Kato, 1943) -- valid
  Phagocata Leidy, 1847 -- valid
  Phagocata albata (Ichikawa and Kawakatsu, 1962) -- valid
  Phagocata albissima (Vejdovsky, 1883) -- valid
  Phagocata altaica (Livanov and Zabusova, 1940) -- valid
  Phagocata angusta Kenk, 1977 -- valid
  Phagocata arethusa (Dalyell, 1814) -- valid
  Phagocata armeniaca (Komarek, 1916) -- valid
  Phagocata asymmetrica Vila-Farré and Sluys, 2011 -- valid
  Phagocata bosniaca (Stankovic, 1926) -- valid
  Phagocata bulbosa Kenk, 1970 -- valid
  Phagocata bursaperforata Darlington, 1959 -- valid
  Phagocata carolinensis Kenk, 1979 -- valid
  Phagocata cavernicola Hyman, 1954 -- valid
  Phagocata coarctica (Arndt, 1920) -- valid
  Phagocata cornuta Chichoff, 1903 -- valid
  Phagocata coronata Girard, 1891 -- invalid
  Phagocata crenophila Carpenter, 1969 -- valid
  Phagocata dalmatica (Stankovic and Komarek, 1927) -- valid
  Phagocata delamarei (Gourbault, 1969) -- valid
  Phagocata fawcetti Ball and Gourbault, 1975 -- valid
  Phagocata flamenca Vila-Farré and Sluys, 2011 -- valid
  Phagocata fontinalis (Sabussow, 1903) -- valid
  Phagocata gallaeciae Vila-Farré and Sluys, 2011 -- valid
  Phagocata gracilis (Haldeman, 1840) -- valid
  Phagocata gracilis gracilis (Haldeman, 1840) -- invalid
  Phagocata gracilis monopharyngea Hyman, 1945 -- invalid
  Phagocata gracilis woodworthi Hyman, 1937 -- invalid
  Phagocata graeca Vila-Farré and Sluys, 2011 -- valid
  Phagocata hamptonae Kenk, 1982 -- valid
  Phagocata hellenica Vila-Farré and Sluys, 2011 -- valid
  Phagocata holleri Kenk, 1979 -- valid
  Phagocata illyrica (Komarek, 1919) -- valid
  Phagocata iwamai Ichikawa and Kawakatsu, 1962 -- valid
  Phagocata kawakatsui Okugawa, 1956 -- valid
  Phagocata kawakatsui kawakatsui Okugawa, 1956 -- valid
  Phagocata kawakatsui naganoensis Ni-imura, 1986 -- valid
  Phagocata leptophallus (Reisinger, 1963) -- valid
  Phagocata macedonica (Stankovic, 1926) -- valid
  Phagocata maculata (Stankovic, 1938) -- valid
  Phagocata mesorchis (Livanov and Zabusova, 1940) -- valid
  Phagocata mesorchis mesorchis (Livanov and Zabusova, 1940) -- valid
  Phagocata mesorchis praeputialis (Livanov and Zabusova, 1940) -- valid
  Phagocata miyadii Okugawa, 1939 -- invalid
  Phagocata monopharyngea Hyman, 1945 -- valid
  Phagocata morgani (Stevens and Boring, 1906) -- valid
  Phagocata morgani morgani (Stevens and Boring, 1906) -- valid
  Phagocata morgani polycelis (Kenk, 1935) -- valid
  Phagocata nivea Kenk, 1953 -- valid
  Phagocata nivea nivea Kenk, 1953 -- invalid
  Phagocata nivea tahoena Kawakatsu, 1968 -- invalid
  Phagocata nordeni Kenk, 1977 -- valid
  Phagocata notadena (de Beauchamp, 1937) -- valid
  Phagocata notorchis Kenk, 1987 -- valid
  Phagocata ochridana (Stankovic and Komarek, 1927) -- valid
  Phagocata olivacea (Schmidt, 1861) -- valid
  Phagocata opisthogona (Kenk, 1936) -- valid
  Phagocata oregonensis Hyman, 1963 -- valid
  Phagocata papillifera (Ijima and Kaburaki, 1916) -- valid
  Phagocata paravitta (Reisinger, 1923) -- valid
  Phagocata paravittoides (Livanov and Zabusova, 1940) -- valid
  Phagocata pellucida (Ijima and Kaburaki, 1916) -- valid
  Phagocata procera Kenk, 1984 -- valid
  Phagocata prosorchis (Kenk, 1937) -- valid
  Phagocata pygmaea Kenk, 1987 -- valid
  Phagocata pyrenaica Vila-Farré and Sluys, 2011 -- valid
  Phagocata racovitzai (de Beauchamp, 1928) -- valid
  Phagocata sibirica (Sabussow, 1903) -- valid
  Phagocata spuria Kenk, 1987 -- valid
  Phagocata stankovici (Reisinger, 1960) -- valid
  Phagocata subterranea Hyman, 1937 -- valid
  Phagocata suginoi Kawakatsu, 1974 -- valid
  Phagocata tahoena Kawakatsu, 1968 -- valid
  Phagocata teletzkiana (Livanov and Zabusova, 1940) -- valid
  Phagocata teletzkiana longopharyngea (Livanov and Zabusova, 1940) -- valid
  Phagocata teletzkiana teletzkiana (Livanov and Zabusova, 1940) -- valid
  Phagocata tenella Ichikawa and Kawakatsu, 1963 -- valid
  Phagocata teshirogii Ichikawa and Kawakatsu, 1962 -- valid
  Phagocata tigrina (Girard, 1850) -- invalid
  Phagocata toyo-okaensis Ni-imura, 1988 -- invalid
  Phagocata truncata Leidy, 1851 -- invalid
  Phagocata tshukotica Porfirieva, 1980 -- valid
  Phagocata uenoi Okugawa, 1939 -- invalid
  Phagocata ullala Sluys, Ribas and Baguna, 1995 -- valid
  Phagocata undulata (Stankovic, 1960) -- valid
  Phagocata velata (Stringer, 1909) -- valid
  Phagocata vernalis Kenk, 1944 -- valid
  Phagocata virilis Kenk, 1977 -- valid
  Phagocata vitta (A. L. Dugès, 1830) -- valid
  Phagocata vivida (Ijima and Kaburaki, 1916) -- valid
  Phagocata woodworthi Hyman, 1937 -- valid
  Pharyngia Nilsson, Wallberg and Jondelius, 2011 -- valid
  Pharyngia furva Nilsson, Wallberg and Jondelius, 2011 -- valid
  Philachoerus Dörjes, 1968 -- valid
  Philachoerus johanni Dörjes, 1968 -- valid
  Philactinoposthia Dörjes, 1968 -- valid
  Philactinoposthia adenogonaria Dörjes, 1968 -- valid
  Philactinoposthia brevis Nilsson, Wallberg and Jondelius, 2011 -- valid
  Philactinoposthia coneyi Hooge and Rocha, 2006 -- valid
  Philactinoposthia diploposthia Dörjes, 1968 -- valid
  Philactinoposthia helgolandica Dörjes, 1968 -- valid
  Philactinoposthia ischiae Nilsson, Wallberg and Jondelius, 2011 -- valid
  Philactinoposthia multipunctata Nilsson, Wallberg and Jondelius, 2011 -- valid
  Philactinoposthia novaecaledoniae Nilsson, Wallberg and Jondelius, 2011 -- valid
  Philactinoposthia pusilla (Westblad, 1946) -- valid
  Philactinoposthia rhammifera (Westblad, 1946) -- valid
  Philactinoposthia saliens (Graff, 1882) -- valid
  Philactinoposthia stylifera (Westblad, 1946) -- valid
  Philactinoposthia stylifera brasiliensis Hooge and Rocha, 2006 -- valid
  Philactinoposthia stylifera stylifera (Westblad, 1946) -- valid
  Philactinoposthia tenebrosa Ehlers and Dörjes, 1979 -- valid
  Philactinoposthia viridis Dörjes, 1968 -- valid
  Philactinoposthia viridorhabditis Dörjes, 1968 -- valid
  Philocelis Dörjes, 1968 -- valid
  Philocelis brueggemanni Hooge and Tyler, 2003 -- valid
  Philocelis cellata Dörjes, 1968 -- valid
  Philocelis karlingi (Westblad, 1946) -- valid
  Philocelis karlingi karlingi (Westblad, 1946) -- valid
  Philocelis karlingi pacifica Ehlers and Dörjes, 1979 -- valid
  Philocelis robrochai Hooge and Rocha, 2006 -- valid
  Philomecynostomum Dörjes, 1968 -- valid
  Philomecynostomum lapillum Dörjes, 1968 -- valid
  Philosyrtis Giard, 1904 -- valid
  Philosyrtis aegusae Lanfranchi, Melai and Meini, 2011 -- valid
  Philosyrtis armoricae Sopott-Ehlers, 1985 -- valid
  Philosyrtis coomansi Martens and Schockaert, 1981 -- valid
  Philosyrtis eumeca Marcus, 1950 -- valid
  Philosyrtis fennica Ax, 1954 -- valid
  Philosyrtis germanica Meixner, 1938 -- invalid
  Philosyrtis monotoides Giard, 1904 -- invalid
  Philosyrtis rauli Noreña, Damborenea and Brusa, 2005 -- valid
  Philosyrtis rotundicephala Sopott, 1972 -- valid
  Philosyrtis rutilata Sopott-Ehlers, 1976 -- valid
  Philosyrtis sanjuanensis Ax and Ax, 1967 -- valid
  Philosyrtis santacruzensis Ax and Ax, 1974 -- valid
  Phonorhynchella Karling, 1956 -- valid
  Phonorhynchella biarcuata Karling, 1956 -- valid
  Phonorhynchoides Beklemischev, 1927 -- valid
  Phonorhynchoides carinostylis Ax and Armonies, 1987 -- valid
  Phonorhynchoides flagellatus Beklemischev, 1927 -- valid
  Phonorhynchoides haegheni Artois and Schockaert, 2001 -- invalid
  Phonorhynchoides japonicus Ax, 2008 -- valid
  Phonorhynchoides linguatus Artois and Tessens, 2008 -- invalid
  Phonorhynchoides somaliensis Schockaert, 1971 -- valid
  Phonorhynchoidinae Tessens, Janssen and Artois, 2014 -- valid
  Phonorhynchus Graff, 1905 -- valid
  Phonorhynchus bitubatus Meixner, 1938 -- valid
  Phonorhynchus helgolandicus (Metschnikoff, 1865) -- valid
  Phonorhynchus helgolandicus contorted Karling, 1982 -- valid
  Phonorhynchus helgolandicus helgolandicus (Metschnikoff, 1865) -- valid
  Phonorhynchus helgolandicus spatula Karling, 1982 -- valid
  Phonorhynchus helgolandicus umbrella Karling, 1982 -- valid
  Phonorhynchus helgolandicus veil Karling, 1982 -- valid
  Phonorhynchus helgolandicus winged Karling, 1982 -- valid
  Phonorhynchus laevitubus Ax, 2008 -- valid
  Phonorhynchus lemanus (Du Plessis, 1895) -- invalid
  Phonorhynchus mamertinus (Graff, 1874) -- invalid
  Phonorhynchus pearsei Ferguson, Stirewalt and Kepner, 1940 -- valid
  Phonorhynchus pernix Ax, 1959 -- valid
  Phrikoceros Newman and Cannon, 1996 -- valid
  Phrikoceros baibaiye Newman and Cannon, 1996 -- valid
  Phrikoceros diadaleos Newman and Cannon, 1996 -- valid
  Phrikoceros fritillus Newman and Cannon, 1996 -- valid
  Phrikoceros galacticus Newman and Cannon, 1996 -- valid
  Phrikoceros katoi Newman and Cannon, 1996 -- valid
  Phrikoceros mopsus (Marcus, 1952) -- valid
  Phylloplana Laidlaw, 1903 -- invalid
  Phylloplana chloranota Boone, 1929 -- invalid
  Phylloplana lactea Laidlaw, 1903 -- invalid
  Phylloplana litoricola Heath and McGregor, 1912 -- invalid
  Phylloplana purpurea Stummer-Traunfels, 1933 -- invalid
  Phylloplana tropicalis (Hyman, 1954) -- invalid
  Phylloplana viridis (Freeman, 1933) -- invalid
  Picola Achatz and Hooge, 2006 -- invalid
  Picola carribea Achatz, Hooge and Tyler, 2007 -- invalid
  Picola renei Achatz and Hooge, 2006 -- invalid
  Pilamonila Willems, Artois, Vermin, Backeljau and Schockaert, 2004 -- valid
  Pilamonila bimascula Willems, Artois, Vermin, Backeljau and Schockaert, 2004 -- valid
  Pilgramilla Sekera, 1912 -- invalid
  Pilgramilla sphagnorum Sekera, 1912 -- invalid
  Pimea Winsor, 1991 -- valid
  Pimea monticola Winsor, 1991 -- valid
  Piscinquilinus Sluys and Kawakatsu, 2005 -- valid
  Piscinquilinus subcutaneus (Syromjatnikova, 1949) -- valid
  Pistrix Marcus, 1951 -- invalid
  Pistrix thelura Marcus, 1951 -- invalid
  Placocephalus Graff, 1896 -- invalid
  Placocephalus bergendali Graff, 1899 -- invalid
  Placocephalus bleekeri Graff, 1899 -- invalid
  Placocephalus dubius (Loman, 1890) -- invalid
  Placocephalus fuscatum (Stimpson, 1857) -- invalid
  Placocephalus gracilis (Loman, 1890) -- invalid
  Placocephalus hasselti (Loman, 1890) -- invalid
  Placocephalus isabellinus Geba, 1909 -- invalid
  Placocephalus javanus (Loman, 1883) -- invalid
  Placocephalus kewensis (Moseley, 1878) -- invalid
  Placocephalus kraepelini Ritter-Zahony, 1905 -- invalid
  Placocephalus mollis Graff, 1899 -- invalid
  Placocephalus murinus Graff, 1899 -- invalid
  Placocephalus niger Ritter-Zahony, 1905 -- invalid
  Placocephalus pictus (Geba, 1909) -- invalid
  Placocephalus richtersi Graff, 1899 -- invalid
  Placocephalus semperi Graff, 1899 -- invalid
  Placocephalus stimpsoni (Diesing, 1862) -- invalid
  Placocephalus superbus Whitehouse, 1914 -- invalid
  Placocephalus umbrinus Geba, 1909 -- invalid
  Placocephalus virchowi Graff, 1899 -- invalid
  Placocephalus virgatum (Stimpson, 1857) -- invalid
  Placorhynchidae Meixner, 1938 -- valid
  Placorhynchus Karling, 1931 -- valid
  Placorhynchus bidens Brunet, 1973 -- valid
  Placorhynchus dimorphis Karling, 1947 -- valid
  Placorhynchus doei Karling, 1995 -- valid
  Placorhynchus echinulatus Karling, 1947 -- valid
  Placorhynchus magnaspina Ax, 2008 -- valid
  Placorhynchus meridionalis Karling, 1952 -- valid
  Placorhynchus octaculeatus Karling, 1931 -- valid
  Placorhynchus octaculeatus dimorphis Karling, 1947 -- invalid
  Placorhynchus pacificus Karling, 1989 -- valid
  Placorhynchus paratetraculeatus Ax and Armonies, 1990 -- valid
  Placorhynchus separatus Ax, 2008 -- valid
  Placorhynchus tetraculeatus Armonies and Hellwig, 1987 -- valid
  Plagiostomidae Graff, 1882 -- valid
  Plagiostomula Westblad, 1956 -- valid
  Plagiostomula vivipara Westblad, 1956 -- valid
  Plagiostomum Schmidt, 1852 -- valid
  Plagiostomum (Plagiostomum) Schmidt, 1852 -- invalid
  Plagiostomum (Plicastoma) Graff, 1904 -- invalid
  Plagiostomum abboti Karling, 1962 -- valid
  Plagiostomum achromaticum Mahan, 1946 -- valid
  Plagiostomum acoluthum Marcus, 1948 -- valid
  Plagiostomum album Hyman, 1938 -- valid
  Plagiostomum anocelis Brandtner, 1934 -- valid
  Plagiostomum anthracinum Kulinitch, 1978 -- valid
  Plagiostomum arcticum Brandtner, 1934 -- invalid
  Plagiostomum autectum Marcus, 1948 -- valid
  Plagiostomum benedeni (Schmidt, 1852) -- valid
  Plagiostomum bimaculatum Graff, 1882 -- invalid
  Plagiostomum birmanse Westblad, 1956 -- invalid
  Plagiostomum boehmigi Karling and Jondelius, 1995 -- valid
  Plagiostomum boreale Schmidt, 1852 -- invalid
  Plagiostomum brandtneri (Westblad, 1956) -- valid
  Plagiostomum caecum Böhmig, 1914 -- valid
  Plagiostomum caspicum Grimm, 1876 -- valid
  Plagiostomum caudatum Levinsen, 1879 -- valid
  Plagiostomum cavernae (Riedl, 1959) -- invalid
  Plagiostomum chinoecetis Brandtner, 1934 -- valid
  Plagiostomum chionoecetis Brandtner, 1934 -- invalid
  Plagiostomum chromogastrum Graff, 1890 -- valid
  Plagiostomum cilioejaculator Brusa, 2006 -- valid
  Plagiostomum cinctum Meixner, 1938 -- valid
  Plagiostomum clusum Marcus, 1951 -- valid
  Plagiostomum cospicum Graff, 1882 -- invalid
  Plagiostomum cuticulata Brandtner, 1934 -- valid
  Plagiostomum cuticulata cuticulata Brandtner, 1934 -- valid
  Plagiostomum cuticulata scandinavica (Westblad, 1956) -- valid
  Plagiostomum dahlgreni Kepner, Stirewalt and Ferguson, 1941 -- valid
  Plagiostomum dioicum (Metschnikoff, 1865) -- invalid
  Plagiostomum drygalskii Böhmig, 1914 -- valid
  Plagiostomum elachisterum (Marcus, 1948) -- valid
  Plagiostomum elongatum Gamble, 1893 -- valid
  Plagiostomum evelinae Marcus, 1946 -- valid
  Plagiostomum fabrei Fuhrmann, 1896 -- valid
  Plagiostomum falklandicum Westblad, 1952 -- valid
  Plagiostomum fasciatum Kulinitch, 1978 -- invalid
  Plagiostomum filicauda Westblad, 1956 -- valid
  Plagiostomum flavum Brandtner, 1934 -- valid
  Plagiostomum funebris (Uljanin, 1870) -- invalid
  Plagiostomum gibbum Norén and Jondelius, 2004 -- valid
  Plagiostomum giganteum Sluys, 1992 -- valid
  Plagiostomum girardi (Schmidt, 1857) -- valid
  Plagiostomum girardi bermudensis Karling, 1978 -- valid
  Plagiostomum girardi girardi (Schmidt, 1857) -- valid
  Plagiostomum girardi groenlandica (Levinsen, 1879) -- valid
  Plagiostomum girardi hymani Karling, 1962 -- valid
  Plagiostomum girardi major Böhmig, 1890 -- valid
  Plagiostomum girardi minima Böhmig, 1890 -- valid
  Plagiostomum girardi ponticum Pereyaslawzewa, 1892 -- valid
  Plagiostomum groenlandicum (Levinsen, 1879) -- invalid
  Plagiostomum haploposthia Marcus, 1948 -- invalid
  Plagiostomum hartmani Karling, 1962 -- valid
  Plagiostomum hartmeyeri Weiss, 1909 -- valid
  Plagiostomum hedgpethi Karling, 1962 -- valid
  Plagiostomum hedgpethi behringensis Kulinitch, 1970 -- valid
  Plagiostomum hedgpethi hedgpethi Karling, 1962 -- valid
  Plagiostomum hymani Karling, 1962 -- invalid
  Plagiostomum karlingi (Kulinitch, 1970) -- invalid
  Plagiostomum koreni Jensen, 1878 -- valid
  Plagiostomum kurrum Marcus, 1951 -- valid
  Plagiostomum lacustre Baylis, 1927 -- valid
  Plagiostomum langi Karling, 1962 -- valid
  Plagiostomum lapinum Marcus, 1952 -- valid
  Plagiostomum lemani (Forel and Du Plessis, 1874) -- valid
  Plagiostomum lobatum (Tozawa, 1918) -- valid
  Plagiostomum lobatum kurilense Kulinitch, 1979 -- valid
  Plagiostomum lobatum lobatum (Tozawa, 1918) -- valid
  Plagiostomum lutheri Böhmig, 1914 -- invalid
  Plagiostomum lutile Norén and Jondelius, 2004 -- valid
  Plagiostomum maculatum Graff, 1882 -- valid
  Plagiostomum makropharynx Brandtner, 1934 -- invalid
  Plagiostomum makroposthia Brandtner, 1934 -- valid
  Plagiostomum mamkaevi Kulinitch, 1978 -- valid
  Plagiostomum megalopharynx Brandtner, 1934 -- invalid
  Plagiostomum meledanum Graff, 1911 -- valid
  Plagiostomum micropharynx An der Lan, 1936 -- invalid
  Plagiostomum mirabile Marcus, 1948 -- invalid
  Plagiostomum morgani Graff, 1911 -- valid
  Plagiostomum nonatoi Marcus, 1948 -- valid
  Plagiostomum norvegicum (Karling, 1940) -- valid
  Plagiostomum nostrum Westblad, 1956 -- valid
  Plagiostomum nucleipharyngeum Karling and Jondelius, 1995 -- valid
  Plagiostomum obscurum An der Lan, 1936 -- invalid
  Plagiostomum ochroleucum Graff, 1882 -- valid
  Plagiostomum opisthogonimum Reisinger, 1926 -- valid
  Plagiostomum oyense de Beauchamp, 1921 -- invalid
  Plagiostomum paradoxum An der Lan, 1936 -- valid
  Plagiostomum parasitorum Brandtner, 1934 -- valid
  Plagiostomum personatum Norén and Jondelius, 2004 -- valid
  Plagiostomum petrophilum Brandtner, 1934 -- valid
  Plagiostomum philippinense Graff, 1882 -- valid
  Plagiostomum planum Silliman, 1884 -- invalid
  Plagiostomum ponticum Pereyaslawzewa, 1892 -- invalid
  Plagiostomum porsildi Brandtner, 1934 -- valid
  Plagiostomum productum (Riedl, 1959) -- invalid
  Plagiostomum providensiensis Kulinitch, 1970 -- valid
  Plagiostomum pseudomaculatum (Gamble, 1893) -- valid
  Plagiostomum quadrioculatum Zacharias, 1894 -- valid
  Plagiostomum remanei Marcus, 1954 -- valid
  Plagiostomum reticulatum (Schmidt, 1852) -- valid
  Plagiostomum rovignense (Steinböck, 1933) -- valid
  Plagiostomum rufodorsatum (Uljanin, 1870) -- invalid
  Plagiostomum sagax Marcus, 1951 -- valid
  Plagiostomum sagitta (Uljanin, 1870) -- valid
  Plagiostomum siphonophorum (Schmidt, 1852) -- invalid
  Plagiostomum sorrentinum Riedl, 1954 -- valid
  Plagiostomum spadix (Riedl, 1959) -- invalid
  Plagiostomum spongiphilum (Riedl, 1959) -- valid
  Plagiostomum stellatum Graff, 1911 -- valid
  Plagiostomum striatum Westblad, 1956 -- valid
  Plagiostomum sulphureum Graff, 1882 -- valid
  Plagiostomum thelotrichum Marcus, 1951 -- valid
  Plagiostomum torquatum Karling, 1940 -- valid
  Plagiostomum violaceum Fuhrmann, 1896 -- valid
  Plagiostomum vittatum (Frey and Leuckart, 1847) -- valid
  Plagiostomum vorax Brandtner, 1934 -- valid
  Plagiostomum whitmani Graff, 1911 -- valid
  Plagiostomum wilsoni Graff, 1911 -- valid
  Plagiostomum xenophilum Riedl, 1959 -- valid
  Plagiotata Plehn, 1896 -- valid
  Plagiotata promiscua Plehn, 1896 -- valid
  Plagnolia de Beauchamp and Gourbault, 1964 -- valid
  Plagnolia vandeli de Beauchamp and Gourbault, 1964 -- valid
  Planaria O. F. Müller, 1776 -- valid
  Planaria aborensis Whitehouse, 1913 -- invalid
  Planaria affinis Ĝrsted, 1843 -- invalid
  Planaria agilis Stringer, 1909 -- invalid
  Planaria albissima Vejdovsky, 1883 -- invalid
  Planaria alpina (Dana, 1766) -- invalid
  Planaria alpina alba Oye, 1935 -- invalid
  Planaria alpina bathycola Steinmann, 1911 -- invalid
  Planaria alpina corsica Arndt, 1920 -- invalid
  Planaria amara Fox, 1927 -- invalid
  Planaria ambigua Böhmig, 1902 -- invalid
  Planaria andina Borelli, 1895 -- invalid
  Planaria angarensis Gerstfeldt, 1858 -- invalid
  Planaria annandalei Kaburaki, 1918 -- invalid
  Planaria anophthalma Mrazek, 1907 -- invalid
  Planaria appendiculata Fabricius, 1826 -- invalid
  Planaria armata Kelaart, 1858 -- invalid
  Planaria armeniaca Komarek, 1916 -- invalid
  Planaria atomata O. F. Müller, 1776 -- invalid
  Planaria aurantiaca Delle Chiaje, 1822 -- invalid
  Planaria aurea Kelaart, 1858 -- invalid
  Planaria auriculatum O. F. Müller, 1784 -- invalid
  Planaria aurita Kennel, 1888 -- invalid
  Planaria barroisi Whitehouse, 1914 -- valid
  Planaria bilinearis Darwin, 1844 -- invalid
  Planaria bilineata Kaburaki, 1918 -- invalid
  Planaria bilobata Leuckart, 1828 -- invalid
  Planaria bituberculata Leuckart, 1828 -- invalid
  Planaria boehmigi Weiss, 1909 -- invalid
  Planaria bosniaca Stankovic, 1926 -- invalid
  Planaria brachycephala Böhmig, 1897 -- invalid
  Planaria brasiliensis Blainville, 1826 -- invalid
  Planaria brementi de Beauchamp, 1919 -- invalid
  Planaria brocchi (Risso, 1818) -- invalid
  Planaria burmaensis Kaburaki, 1918 -- invalid
  Planaria caeca A. L. Dugès, 1830 -- invalid
  Planaria cameliae Fuhrmann, 1914 -- invalid
  Planaria cavatica Fries, 1874 -- invalid
  Planaria cerebralis Kelaart, 1858 -- invalid
  Planaria chichkovi Hranova, 1929 -- invalid
  Planaria convoluta Abildgaard, 1806 -- invalid
  Planaria corniculata Dalyell, 1853 -- invalid
  Planaria cornuta O. F. Müller, 1776 -- invalid
  Planaria crocea Fabricius, 1826 -- invalid
  Planaria cruciatus Fabricius, 1826 -- invalid
  Planaria dactyligera Kenk, 1935 -- invalid
  Planaria dactyligera musculosa Kenk, 1969 -- invalid
  Planaria dicquemari (Risso, 1818) -- invalid
  Planaria dicquemaris Delle Chiaje, 1841 -- invalid
  Planaria dicquemaris verrucosa (Delle Chiaje, 1829) -- invalid
  Planaria dimorpha Böhmig, 1902 -- invalid
  Planaria dioica Claparède, 1863 -- invalid
  Planaria dorotocephala Woodworth, 1897 -- invalid
  Planaria dubia Borelli, 1895 -- invalid
  Planaria dubia maculata Borelli, 1895 -- invalid
  Planaria dulcis Kelaart, 1858 -- invalid
  Planaria ehrenbergii Focke, 1836 -- invalid
  Planaria ehrenbergii quadrangularis Focke, 1836 -- invalid
  Planaria elegans Kelaart, 1858 -- invalid
  Planaria elegans Darwin, 1844 -- invalid
  Planaria ellipsis Dalyell, 1853 -- invalid
  Planaria elongata Darwin, 1844 -- invalid
  Planaria emarginata Fabricius, 1826 -- invalid
  Planaria festae Borelli, 1898 -- invalid
  Planaria festae albolineata Borelli, 1898 -- invalid
  Planaria fissipara Kennel, 1888 -- invalid
  Planaria flava Delle Chiaje, 1822 -- valid
  Planaria flexilis Dalyell, 1814 -- invalid
  Planaria flustrae Dalyell, 1853 -- invalid
  Planaria fodina Dalyell, 1853 -- invalid
  Planaria foecunda Dalyell, 1853 -- invalid
  Planaria fontana Schrank, 1803 -- valid
  Planaria foremanii (Girard, 1852) -- invalid
  Planaria formosa Darwin, 1844 -- invalid
  Planaria frequens Leidy, 1855 -- invalid
  Planaria fuliginosus Leidy, 1851 -- valid
  Planaria fulva O. F. Müller, 1789 -- invalid
  Planaria fusca Kelaart, 1858 -- invalid
  Planaria gesserensis O. F. Müller, 1784 -- invalid
  Planaria gialliccia Delle Chiaje, 1828 -- invalid
  Planaria gibba Fabricius, 1826 -- invalid
  Planaria gigas Leuckart, 1828 -- valid
  Planaria gonocephala A. L. Dugès, 1830 -- invalid
  Planaria gonocephaloides (Girard, 1850) -- invalid
  Planaria gracilis Haldeman, 1840 -- invalid
  Planaria graffi Weiss, 1909 -- invalid
  Planaria grisea O. F. Müller, 1789 -- invalid
  Planaria grisescens Fabricius, 1826 -- invalid
  Planaria grossa (O. F. Müller, 1774) -- invalid
  Planaria grubii Sabussow, 1903 -- invalid
  Planaria grubiiformis Sabussow, 1929 -- invalid
  Planaria hebes Dalyell, 1852 -- invalid
  Planaria hoernesi Weiss, 1909 -- invalid
  Planaria hymani Sivickis, 1928 -- invalid
  Planaria ignorata Raspail, 1902 -- valid
  Planaria iheringii Böhmig, 1887 -- invalid
  Planaria incisa Darwin, 1844 -- invalid
  Planaria infernalis Steinmann, 1907 -- invalid
  Planaria jeanneli de Beauchamp, 1913 -- invalid
  Planaria kempi Whitehouse, 1913 -- valid
  Planaria lactea O. F. Müller, 1776 -- invalid
  Planaria lactea bathycola Steinmann, 1909 -- invalid
  Planaria lata Sivickis, 1923 -- invalid
  Planaria laurentiana Borelli, 1897 -- invalid
  Planaria lemani (Forel and Du Plessis, 1874) -- invalid
  Planaria leucophraea Fabricius, 1826 -- invalid
  Planaria lichenoides Mertens, 1833 -- invalid
  Planaria limacina Fabricius, 1826 -- invalid
  Planaria limbata Leuckart, 1828 -- invalid
  Planaria limuli Graff, 1879 -- invalid
  Planaria lineare (O. F. Müller, 1773) -- invalid
  Planaria lingua Abildgaard, 1789 -- invalid
  Planaria littoralis O. F. Müller, 1776 -- invalid
  Planaria longiceps A. L. Dugès, 1830 -- invalid
  Planaria longistriata Fuhrmann, 1914 -- invalid
  Planaria lugubris Schmidt, 1861 -- invalid
  Planaria lutea (Ĝrsted, 1844) -- invalid
  Planaria luteola Delle Chiaje, 1822 -- valid
  Planaria macedonica Stankovic, 1926 -- invalid
  Planaria macrostomum Darwin, 1844 -- invalid
  Planaria maculata Dalyell, 1853 -- valid
  Planaria maculata Darwin, 1844 -- invalid
  Planaria marmorata Bosc, 1802 -- invalid
  Planaria marmorosa O. F. Müller, 1776 -- valid
  Planaria meleagrina Kelaart, 1858 -- invalid
  Planaria mertoni Steinmann, 1914 -- invalid
  Planaria michaelseni Böhmig, 1902 -- invalid
  Planaria montenigrina Mrazek, 1904 -- invalid
  Planaria morgani Stevens and Boring, 1906 -- invalid
  Planaria mrazeki Vejdovsky, 1895 -- invalid
  Planaria muelleri Delle Chiaje, 1829 -- invalid
  Planaria mulleri Audouin, 1827 -- invalid
  Planaria neapolitana Delle Chiaje, 1841 -- invalid
  Planaria neapolitana Goette, 1878 -- invalid
  Planaria nesidensis Delle Chiaje, 1822 -- valid
  Planaria neumanni Neppi, 1904 -- invalid
  Planaria nigricans Fabricius, 1826 -- invalid
  Planaria nigrocincta Laidlaw, 1903 -- invalid
  Planaria nigrofasciata Grube, 1872 -- invalid
  Planaria nigrofusca Darwin, 1844 -- invalid
  Planaria notulata Bosc, 1802 -- invalid
  Planaria occulta Kenk, 1969 -- invalid
  Planaria oceanica Darwin, 1844 -- invalid
  Planaria onegensis Sabussow, 1903 -- valid
  Planaria pallida Darwin, 1844 -- invalid
  Planaria papilionis Kelaart, 1858 -- invalid
  Planaria papillifera Ijima and Kaburaki, 1916 -- invalid
  Planaria paramensis Fuhrmann, 1914 -- invalid
  Planaria paravitta Reisinger, 1923 -- invalid
  Planaria pardalina Grube, 1872 -- invalid
  Planaria patagonica Borelli, 1901 -- invalid
  Planaria pellucida Ijima and Kaburaki, 1916 -- invalid
  Planaria pellucida Bosc, 1803 -- invalid
  Planaria pellucida Mertens, 1833 -- invalid
  Planaria pinguis Weiss, 1910 -- invalid
  Planaria polychroa Schmidt, 1861 -- invalid
  Planaria polyorchis Fuhrmann, 1914 -- invalid
  Planaria pulla Darwin, 1844 -- invalid
  Planaria punctata (O. F. Müller, 1773) -- invalid
  Planaria punctatum Carus, 1863 -- valid
  Planaria purpurea Kelaart, 1858 -- invalid
  Planaria racovitzai de Beauchamp, 1928 -- invalid
  Planaria radiata (O. F. Müller, 1773) -- invalid
  Planaria rava Weiss, 1909 -- invalid
  Planaria retusa Vivianini, 1805 -- invalid
  Planaria rosea (O. F. Müller, 1773) -- valid
  Planaria rostrata (O. F. Müller, 1774) -- invalid
  Planaria rutilans Abildgaard, 1789 -- invalid
  Planaria saline Whitehouse, 1914 -- invalid
  Planaria sargassicola Mertens, 1833 -- invalid
  Planaria schauinslandi Neppi, 1904 -- invalid
  Planaria schlosseri Girard, 1873 -- invalid
  Planaria semilineata Darwin, 1844 -- invalid
  Planaria serpentina Dalyell, 1853 -- invalid
  Planaria sibirica Sabussow, 1903 -- invalid
  Planaria similis Böhmig, 1902 -- invalid
  Planaria simplex Woodworth, 1896 -- valid
  Planaria simplicissima Morgan, 1904 -- invalid
  Planaria simplissima Curtis, 1900 -- invalid
  Planaria siphunculus Delle Chiaje, 1822 -- invalid
  Planaria stagni Dalyell, 1853 -- invalid
  Planaria striata Kelaart, 1858 -- invalid
  Planaria stringulata Korotneff, 1912 -- invalid
  Planaria subauriculata Johnston, 1836 -- invalid
  Planaria subtentaculata Draparnaud, 1803 -- invalid
  Planaria subulata O. F. Müller, 1788 -- invalid
  Planaria subulata Fabricius, 1780 -- invalid
  Planaria suesensis (Ehrenberg, 1831) -- invalid
  Planaria sylvatica Leidy, 1851 -- invalid
  Planaria tanganyika Laidlaw, 1906 -- invalid
  Planaria tasmaniana Darwin, 1844 -- invalid
  Planaria teratophila Steinmann, 1908 -- invalid
  Planaria tetragona (O. F. Müller, 1774) -- invalid
  Planaria thesea Kelaart, 1858 -- invalid
  Planaria tiberiensis Whitehouse, 1914 -- invalid
  Planaria torva (O. F. Müller, 1774) -- valid
  Planaria torva korsika Arndt, 1926 -- invalid
  Planaria tremellaris Grube, 1840 -- valid
  Planaria tremellaris (O. F. Müller, 1773) -- invalid
  Planaria truncata (Leidy, 1851) -- invalid
  Planaria tuberculata Delle Chiaje, 1828 -- invalid
  Planaria tubulosa Fabricius, 1826 -- invalid
  Planaria ulvae (Ĝrsted, 1843) -- invalid
  Planaria ulvae Uljanin, 1870 -- invalid
  Planaria undulata Kelaart, 1858 -- invalid
  Planaria unionicola Woodworth, 1897 -- valid
  Planaria unipunctata Fabricius, 1826 -- invalid
  Planaria vaginuloides Darwin, 1844 -- invalid
  Planaria variegata Dalyell, 1853 -- invalid
  Planaria velata Stringer, 1909 -- invalid
  Planaria velellae Lesson, 1830 -- valid
  Planaria velox Dalyell, 1814 -- invalid
  Planaria venusta Böhmig, 1897 -- invalid
  Planaria verrucosa Delle Chiaje, 1829 -- valid
  Planaria vevellae Lesson, 1830 -- invalid
  Planaria violacea Delle Chiaje, 1822 -- invalid
  Planaria violacea Kelaart, 1858 -- invalid
  Planaria viridata Abildgaard, 1789 -- invalid
  Planaria viridis Kelaart, 1858 -- invalid
  Planaria vitta A. L. Dugès, 1830 -- invalid
  Planaria vittata Montagu, 1815 -- invalid
  Planaria wytegrensis Sabussow, 1907 -- invalid
  Planaria zebra Leuckart, 1828 -- invalid
  Planaria zeylanica Kelaart, 1858 -- invalid
  Planaridium Pease, 1860 -- invalid
  Planariidae Stimpson, 1857 -- valid
  Planarioidea Stimpson, 1857 -- valid
  Planctoplana Graff, 1892 -- invalid
  Planctoplana challengeri Graff, 1892 -- invalid
  Planctoplanella Hyman, 1940 -- valid
  Planctoplanella atlantica Hyman, 1940 -- valid
  Planeolis Stimpson, 1857 -- invalid
  Planeolis panormis (Quatrefage, 1845) -- invalid
  Planocera Blainville, 1828 -- valid
  Planocera amphibola (Schmarda, 1859) -- invalid
  Planocera amphibolus (Schmarda, 1859) -- invalid
  Planocera armata Laidlaw, 1902 -- valid
  Planocera aurea (Kelaart, 1858) -- valid
  Planocera bituberculata (Leuckart, 1828) -- invalid
  Planocera burchami Heath and McGregor, 1912 -- invalid
  Planocera californica Heath and McGregor, 1912 -- invalid
  Planocera ceratommata (Palombi, 1936) -- valid
  Planocera corniculata (Dalyell, 1853) -- invalid
  Planocera corniculatus (Dalyell, 1853) -- invalid
  Planocera crosslandi Laidlaw, 1903 -- valid
  Planocera dictyota (Schmarda, 1859) -- valid
  Planocera dictyotus (Schmarda, 1859) -- invalid
  Planocera discoidea Willey, 1897 -- invalid
  Planocera discoides Willey, 1897 -- valid
  Planocera discus Willey, 1897 -- invalid
  Planocera edmondsi Prudhoe, 1982 -- valid
  Planocera elegans (Kelaart, 1858) -- invalid
  Planocera elliptica Girard, 1850 -- invalid
  Planocera folia (Grube, 1840) -- valid
  Planocera folium (Grube, 1840) -- invalid
  Planocera gaimardi Blainville, 1828 -- invalid
  Planocera gilchristi Jacubowa, 1906 -- valid
  Planocera graffi Lang, 1879 -- valid
  Planocera grubei Graff, 1892 -- invalid
  Planocera hawaiensis Heath, 1907 -- valid
  Planocera hawaiiensis Heath, 1907 -- invalid
  Planocera heda Kato, 1944 -- valid
  Planocera heteroglena (Schmarda, 1859) -- invalid
  Planocera inquilina Wheeler, 1894 -- invalid
  Planocera insignis Lang, 1884 -- invalid
  Planocera langi Laidlaw, 1902 -- invalid
  Planocera langii Laidlaw, 1902 -- invalid
  Planocera marginata (Stimpson, 1857) -- invalid
  Planocera muelleri (Audouin, 1827) -- invalid
  Planocera mulleri (Audouin, 1827) -- invalid
  Planocera multitentaculata Kato, 1944 -- valid
  Planocera nebulosa Girard, 1853 -- invalid
  Planocera oligoglena (Schmarda, 1859) -- invalid
  Planocera oxyceraea (Schmarda, 1859) -- invalid
  Planocera oxycerea (Schmarda, 1859) -- invalid
  Planocera pacifica Hyman, 1954 -- valid
  Planocera papillosa Lang, 1884 -- invalid
  Planocera pelagica (Moseley, 1877) -- invalid
  Planocera pellucida (Mertens, 1833) -- valid
  Planocera profunda Kato, 1937 -- valid
  Planocera purpurea Yeri and Kaburaki, 1918 -- valid
  Planocera rainieri Belloc, 1961 -- valid
  Planocera reticulata (Stimpson, 1855) -- valid
  Planocera sandiegensis Boone, 1929 -- invalid
  Planocera sargassicola (Mertens, 1833) -- invalid
  Planocera simrothi Graff, 1892 -- invalid
  Planocera suesensis (Ehrenberg, 1831) -- invalid
  Planocera thesea (Kelaart, 1858) -- valid
  Planocera tridentata Hyman, 1953 -- valid
  Planocera uncinata Palombi, 1939 -- valid
  Planocera villosa Lang, 1884 -- invalid
  Planoceridae Lang, 1884 -- valid
  Planocerodes Palombi, 1936 -- invalid
  Planocerodes ceratommata Palombi, 1936 -- invalid
  Planoceroidea Lang, 1884 -- valid
  Planoceropsis Verrill, 1893 -- invalid
  Planoceropsis nebulosa (Girard, 1853) -- invalid
  Planoceros Ehrenberg, 1831 -- invalid
  Planoceros gaimardi (Blainville, 1828) -- invalid
  Platamonia Busch, 1851 -- invalid
  Platamonia tergestina Busch, 1851 -- invalid
  Platydemus Graff, 1896 -- valid
  Platydemus africanus Graff, 1899 -- invalid
  Platydemus albicinctus Graff, 1899 -- invalid
  Platydemus assimilis Wood, 1926 -- invalid
  Platydemus atropurpureus Graff, 1899 -- invalid
  Platydemus bistriatus (Grube, 1868) -- invalid
  Platydemus bivittatus Graff, 1899 -- valid
  Platydemus boehmigi Geba, 1909 -- invalid
  Platydemus boholicus Graff, 1899 -- invalid
  Platydemus conspersus Graff, 1899 -- invalid
  Platydemus dubius (Spencer, 1892) -- invalid
  Platydemus fasciatus (Spencer, 1892) -- valid
  Platydemus fletcheri (Spencer, 1892) -- invalid
  Platydemus grandis (Spencer, 1892) -- valid
  Platydemus insularis Graff, 1899 -- invalid
  Platydemus joliveti de Beauchamp, 1972 -- valid
  Platydemus kraepelini Graff, 1899 -- invalid
  Platydemus laterolineatus (Spencer, 1892) -- invalid
  Platydemus leidyi Graff, 1899 -- invalid
  Platydemus lineolatus Graff, 1899 -- invalid
  Platydemus lividus Graff, 1899 -- valid
  Platydemus longibulbus de Beauchamp, 1972 -- valid
  Platydemus luteicollis Graff, 1899 -- invalid
  Platydemus macrophthalmus Graff, 1899 -- valid
  Platydemus manokwari de Beauchamp, 1962 -- valid
  Platydemus mediolineatus (Spencer, 1892) -- invalid
  Platydemus miniatus Graff, 1899 -- invalid
  Platydemus montanus Mell, 1904 -- invalid
  Platydemus moseleyi (Fletcher and Hamilton, 1888) -- invalid
  Platydemus niger (Fletcher and Hamilton, 1888) -- invalid
  Platydemus pindaudei de Beauchamp, 1972 -- valid
  Platydemus quadrilineatus Haslauer-Gamisch, 1982 -- invalid
  Platydemus quadristriatus (Grube, 1868) -- invalid
  Platydemus renschi Haslauer-Gamisch, 1982 -- invalid
  Platydemus septemstriatus Graff, 1899 -- invalid
  Platydemus sumbawaeiensis Haslauer-Gamisch, 1982 -- invalid
  Platydemus tabatteldili Graff, 1899 -- invalid
  Platydemus thwaitesii (Moseley, 1874) -- invalid
  Platydemus trilineatus (Fletcher and Hamilton, 1888) -- invalid
  Platydemus vanheurni de Beauchamp, 1929 -- valid
  Platydemus victoriae (Dendy, 1891) -- valid
  Platydemus zimmermanni de Beauchamp, 1952 -- valid
  Platyhelminthes Minot, 1876 -- valid -- flatworms, plathelminthes, platodes, platelminte
  Plehnia Bock, 1913 -- valid
  Plehnia arctica (Plehn, 1896) -- valid
  Plehnia caeca Hyman, 1953 -- invalid
  Plehnia caeca oculifera Hyman, 1953 -- invalid
  Plehnia ellipsoides (Girard in Stimpson, 1854) -- valid
  Plehnia japonica Bock, 1923 -- valid
  Plehnia ovatus (Kato, 1937) -- valid
  Plehnia pacifica Kato, 1939 -- invalid
  Plehnia tropica Hyman, 1959 -- invalid
  Plehniidae Bock, 1913 -- valid
  Pleioplana Faubel, 1983 -- valid
  Pleioplana atomata (O. F. Müller, 1776) -- valid
  Pleioplana bosphorensis Bulnes, Kalkan and Karhan, 2009 -- valid
  Pleioplana californica (Plehn, 1898) -- valid
  Pleioplana delicata (Yeri and Kaburaki, 1918) -- valid
  Pleioplana inquieta (Heath and McGregor, 1912) -- invalid
  Pleioplana megala (Marcus, 1952) -- invalid
  Pleioplana mortenseni (Bock, 1913) -- valid
  Pleioplana okusi Bulnes, Kalkan and Karhan, 2009 -- valid
  Pleioplanidae Faubel, 1983 -- valid
  Plessisia Graff, 1904 -- invalid
  Plicastoma Graff, 1904 -- valid
  Plicastoma astrum Marcus, 1947 -- valid
  Plicastoma bimaculatum (Graff, 1882) -- valid
  Plicastoma carvalhoi Marcus, 1947 -- valid
  Plicastoma cavernae Riedl, 1959 -- valid
  Plicastoma cuticulata (Brandtner, 1934) -- invalid
  Plicastoma glaucum Riedl, 1959 -- valid
  Plicastoma jenseni (Reisinger, 1935) -- valid
  Plicastoma karlingi Kulinitch, 1970 -- valid
  Plicastoma lutheri (Böhmig, 1914) -- valid
  Plicastoma micropharynx (An der Lan, 1936) -- valid
  Plicastoma norvegicum Karling, 1940 -- invalid
  Plicastoma phocae Marcus, 1947 -- valid
  Plicastoma productum Riedl, 1959 -- valid
  Plicastoma spadix Riedl, 1959 -- valid
  Plicastoma xenophthalmum Riedl, 1959 -- valid
  Pluribursaeplana Ax and Ax, 1967 -- valid
  Pluribursaeplana illgi Ax and Ax, 1967 -- valid
  Pocillorhynchus Brunet, 1973 -- valid
  Pocillorhynchus agilis Brunet, 1973 -- valid
  Pocillorhynchus minutus Brunet, 1973 -- valid
  Pocillorhynchus spiroductus Schockaert, 1982 -- valid
  Podoplana Korotneff, 1912 -- invalid
  Podoplana olivacea Korotneff, 1912 -- invalid
  Pogaina Marcus, 1954 -- valid
  Pogaina adriatica (Dörler, 1900) -- invalid
  Pogaina alaskana Ax and Armonies, 1990 -- valid
  Pogaina annulata Ax, 1970 -- valid
  Pogaina arcassonensis Ehlers and Sopott-Ehlers, 1989 -- valid
  Pogaina bicornis Karling, 1986 -- valid
  Pogaina hanleyi Jondelius, 1997 -- valid
  Pogaina japonica Ax, 2008 -- valid
  Pogaina kinnei Ax, 1970 -- valid
  Pogaina murmanica (Graff, 1905) -- invalid
  Pogaina natans (Ax, 1951) -- valid
  Pogaina oncostylis Ax and Armonies, 1987 -- valid
  Pogaina paranygulgus Karling, 1986 -- valid
  Pogaina scypha Ax, 2008 -- valid
  Pogaina suecica (Luther, 1948) -- valid
  Pogaina suslica (Marcus, 1951) -- valid
  Pogaina tifa Marcus, 1954 -- valid
  Pogaina ussuriensis (Nasonov, 1932) -- valid
  Polliculus Van Steenkiste, Volonterio, Schockaert and Artois, 2008 -- valid
  Polliculus cochlearis Van Steenkiste, Volonterio, Schockaert and Artois, 2008 -- valid
  Polycanthiidae Hooge, 2003 -- invalid
  Polycanthus Hooge, 2003 -- valid
  Polycanthus torosus Hooge, 2003 -- valid
  Polycelis Ehrenberg, 1831 -- valid
  Polycelis (Polycelidia) Livanov and Zabusova, 1940 -- valid
  Polycelis (Polycelis) Ehrenberg, 1831 -- valid
  Polycelis (Rjabuschinskya) Sabussow, 1916 -- invalid
  Polycelis (Sorocelides) Sabussow, 1929 -- invalid
  Polycelis akkeshi Ichikawa and Kawakatsu, 1963 -- invalid
  Polycelis almaatina (Sabussow, 1947) -- invalid
  Polycelis asiatica Selivanova, 1985 -- invalid
  Polycelis aurantiacus Panceri, 1875 -- valid
  Polycelis auriculata Ijima and Kaburaki, 1916 -- invalid
  Polycelis australis Schmarda, 1859 -- invalid
  Polycelis benazzii de Beauchamp, 1955 -- valid
  Polycelis bilinearis Diesing, 1850 -- valid
  Polycelis borealis Kenk, 1953 -- invalid
  Polycelis borelli Vandel, 1921 -- invalid
  Polycelis brunnea (O. F. Müller, 1773) -- invalid
  Polycelis capensis Schmarda, 1859 -- invalid
  Polycelis catulus Girard, 1893 -- valid
  Polycelis cormita Hunt, 1948 -- valid
  Polycelis cornuta (Johnston, 1822) -- invalid
  Polycelis cornuta borelli Vandel, 1921 -- invalid
  Polycelis cornuta brunnea Borelli, 1893 -- invalid
  Polycelis cornuta fissipara Thienemann, 1949 -- invalid
  Polycelis cornuta viganensis (A. L. Dugès, 1830) -- invalid
  Polycelis coronata (Girard, 1891) -- valid
  Polycelis coronata borealis Kenk, 1953 -- invalid
  Polycelis coronata brevipenis Kenk, 1972 -- valid
  Polycelis coronata coronata (Girard, 1891) -- valid
  Polycelis coronata monticola Kenk and Hampton, 1982 -- valid
  Polycelis eburnea (Muth, 1912) -- valid
  Polycelis elegans Diesing, 1850 -- valid
  Polycelis ellipsis (Dalyell, 1853) -- invalid
  Polycelis elongata (Sabussow, 1929) -- invalid
  Polycelis erythrotaenia Schmarda, 1859 -- invalid
  Polycelis eudendrocoeloides (Sabussow, 1929) -- invalid
  Polycelis eurantron (Sabussow, 1936) -- valid
  Polycelis fallax Quatrefage, 1845 -- valid
  Polycelis felina (Dalyell, 1814) -- valid
  Polycelis felina borelli Vandel, 1921 -- valid
  Polycelis felina brunnea Borelli, 1893 -- valid
  Polycelis felina felina (Dalyell, 1814) -- valid
  Polycelis felina viganensis (A. L. Dugès, 1830) -- valid
  Polycelis ferruginea Schmarda, 1859 -- invalid
  Polycelis gracilis (Seidl, 1911) -- valid
  Polycelis haloglena Schmarda, 1859 -- invalid
  Polycelis hepta Hansen-Melander, Melander and Reynoldsen, 1954 -- valid
  Polycelis hyalina Schmidt, 1861 -- invalid
  Polycelis ijimai Kaburaki, 1917 -- invalid
  Polycelis jinglensis Liu, 1996 -- valid
  Polycelis jingyuanica Liu, 1996 -- valid
  Polycelis karafto Ijima and Kaburaki, 1916 -- invalid
  Polycelis kashmirica Liu, 1993 -- valid
  Polycelis koslowi (Sabussow, 1911) -- valid
  Polycelis koslowi eburnea (Muth, 1912) -- invalid
  Polycelis koslowi tibetica Hyman, 1934 -- invalid
  Polycelis kulsaika Zabusov-Zhdanova, 1947 -- valid
  Polycelis lactea (Seidl, 1911) -- invalid
  Polycelis laevigatus Quatrefage, 1846 -- invalid
  Polycelis lhunzhubica Liu, 1993 -- valid
  Polycelis lineoliger Blanchard, 1849 -- valid
  Polycelis linkoi Sabussow, 1901 -- valid
  Polycelis lyrosora Schmarda, 1859 -- invalid
  Polycelis macrorhynchus Schmarda, 1859 -- invalid
  Polycelis microsora Schmarda, 1859 -- invalid
  Polycelis modestus Quatrefage, 1845 -- invalid
  Polycelis monticola Kenk and Hampton, 1982 -- invalid
  Polycelis mutabilis Verrill, 1873 -- invalid
  Polycelis nigra (O. F. Müller, 1773) -- valid
  Polycelis nigra brunnea (O. F. Müller, 1773) -- valid
  Polycelis nigra ehrenbergi Berninger, 1911 -- valid
  Polycelis nigra nigra (O. F. Müller, 1773) -- valid
  Polycelis nigra panniculata Perkins, 1928 -- valid
  Polycelis nigra viganensis Diesing, 1850 -- valid
  Polycelis nigrofusca Diesing, 1850 -- valid
  Polycelis nyingchica Liu, 1993 -- valid
  Polycelis obovata Schmarda, 1859 -- invalid
  Polycelis oculimarginata (Palombi, 1931) -- valid
  Polycelis oosora Schmarda, 1859 -- invalid
  Polycelis ophryoglena Schmarda, 1859 -- invalid
  Polycelis orbicularis Schmarda, 1859 -- invalid
  Polycelis pallida Diesing, 1850 -- valid
  Polycelis pallidus Quatrefage, 1845 -- invalid
  Polycelis pamirensis de Beauchamp, 1961 -- valid
  Polycelis panniculatus Girard, 1893 -- valid
  Polycelis pathan de Beauchamp, 1959 -- valid
  Polycelis polychroa Girard, 1893 -- valid
  Polycelis polyopis Sabussow, 1936 -- valid
  Polycelis pulla Diesing, 1850 -- valid
  Polycelis receptaculosa (Livanov and Zabusova, 1940) -- valid
  Polycelis relicta (Sabussow, 1929) -- valid
  Polycelis remota Smith, 1988 -- invalid
  Polycelis roseimaculatus Blanchard, 1849 -- valid
  Polycelis sabussowi (Seidl, 1911) -- invalid
  Polycelis sabussowi almaatina (Sabussow, 1947) -- invalid
  Polycelis sapporo (Ijima and Kaburaki, 1916) -- valid
  Polycelis schmidti (Sabussow, 1916) -- invalid
  Polycelis schulmanii Grimm, 1876 -- invalid
  Polycelis sierrensis Kenk, 1973 -- valid
  Polycelis sinensis Liu, 1993 -- valid
  Polycelis stummeri (Seidl, 1911) -- invalid
  Polycelis surantion Sabussow, 1936 -- valid
  Polycelis tasmanica Darwin, 1844 -- valid
  Polycelis tenuis Ijima, 1884 -- valid
  Polycelis tenuis altaica (Livanov and Zabusova, 1940) -- invalid
  Polycelis tibetica Hyman, 1934 -- valid
  Polycelis tibetica (Sabussow, 1911) -- invalid
  Polycelis tigrina Blanchard, 1847 -- invalid
  Polycelis tothi Méhely, 1927 -- valid
  Polycelis trapezoglena Schmarda, 1859 -- invalid
  Polycelis vaginuloides Diesing, 1850 -- valid
  Polycelis variabilis Girard, 1850 -- valid
  Polycelis wutaishanica Liu, 1993 -- valid
  Polycelis xigazensis Liu, 1993 -- valid
  Polychaerus Buchanan, 1892 -- invalid
  Polychoerus Mark, 1892 -- valid
  Polychoerus carmelensis Costello and Costello, 1938 -- valid
  Polychoerus caudatus Mark, 1892 -- valid
  Polychoerus ebenhochi Achatz, Hooge and Tyler, 2007 -- valid
  Polychoerus gordoni Achatz, Hooge, Wallberg, Jondelius and Tyler, 2009 -- valid
  Polychoerus langerhansi (Graff, 1882) -- invalid
  Polychoerus langherhansi Beklemischev, 1914 -- invalid
  Polychoerus parvus Achatz, Hooge and Tyler, 2007 -- valid
  Polychoerus virescens (Ĝrsted, 1845) -- invalid
  Polycladida Lang, 1884 -- valid -- polyclads
  Polycladodes Steinmann, 1910 -- invalid
  Polycladodes affine (Codreanu and Balcesco, 1970) -- invalid
  Polycladodes alba Steinmann, 1910 -- invalid
  Polycladodes caecum (Komarek, 1926) -- invalid
  Polycladodes caspicum (Porfirieva and Dyganova, 1973) -- invalid
  Polycladodes cavatica (Fries, 1874) -- invalid
  Polycladodes decemoculata (Komarek, 1919) -- invalid
  Polycladodes subterranea Hartmann, 1921 -- invalid
  Polycladodes voinovi Codreanu, 1929 -- invalid
  Polycladus Blanchard, 1845 -- valid
  Polycladus andicola Schmarda, 1859 -- invalid
  Polycladus darwini Diesing, 1862 -- valid
  Polycladus elongatus Stimpson, 1857 -- valid
  Polycladus gayi Blanchard, 1847 -- valid
  Polycladus maculatus (Darwin, 1844) -- invalid
  Polycladus semilineatus (Darwin, 1844) -- invalid
  Polycotylus Korotneff, 1912 -- invalid
  Polycotylus profundus Korotneff, 1912 -- invalid
  Polycotylus validus Korotneff, 1912 -- invalid
  Polycystidae Graff, 1905 -- invalid
  Polycystididae Graff, 1905 -- valid
  Polycystidinae Graff, 1905 -- valid
  Polycystis Kölliker, 1845 -- valid
  Polycystis ali Schockaert, 1982 -- valid
  Polycystis ali ali Schockaert, 1982 -- valid
  Polycystis ali californica Karling, 1986 -- invalid
  Polycystis ali galapagos Karling, 1986 -- valid
  Polycystis ali somali Karling, 1986 -- valid
  Polycystis angarensis Sibiriakova, 1929 -- invalid
  Polycystis assimilis (Levinsen, 1879) -- invalid
  Polycystis australis Willems, Schockaert and Artois, 2006 -- valid
  Polycystis bilobata Nasonov, 1935 -- invalid
  Polycystis caledonicus (Claparède, 1861) -- invalid
  Polycystis californica Karling, 1986 -- valid
  Polycystis campanulata Nasonov, 1935 -- invalid
  Polycystis contorta Schockaert and Karling, 1975 -- invalid
  Polycystis crocea (Fabricius, 1826) -- invalid
  Polycystis dolichocephala Pereyaslawzewa, 1892 -- invalid
  Polycystis elsae Artois and Tessens, 2008 -- valid
  Polycystis felis Marcus, 1954 -- invalid
  Polycystis gabriellae (Marcus, 1948) -- valid
  Polycystis georgii Graff, 1905 -- invalid
  Polycystis goettei Bresslau, 1906 -- invalid
  Polycystis groenlandica Levinsen, 1879 -- invalid
  Polycystis hamata Karling, 1986 -- valid
  Polycystis hibernica Southern, 1936 -- invalid
  Polycystis intubata Graff, 1905 -- invalid
  Polycystis intubata erythea Beklemischev, 1927 -- invalid
  Polycystis irregulatus Nasonov, 1935 -- invalid
  Polycystis mamertinus (Graff, 1874) -- invalid
  Polycystis matarazzoi (Marcus, 1948) -- invalid
  Polycystis minuta (Uljanin, 1870) -- invalid
  Polycystis multifida Nasonov, 1935 -- invalid
  Polycystis naegelii Kölliker, 1845 -- valid
  Polycystis orientalis Evdonin, 1968 -- valid
  Polycystis riedli Karling, 1956 -- invalid
  Polycystis robusta (Karling, 1931) -- invalid
  Polycystis roosevelti Graff, 1911 -- invalid
  Polycystis steueri Steinböck, 1933 -- invalid
  Polycystis subcontorta Schockaert, 1982 -- invalid
  Polycystis taeniophoris (Steinböck, 1933) -- invalid
  Polycystis tenuis Beklemischev, 1921 -- invalid
  Polycystis trifida Nasonov, 1935 -- invalid
  Polycystis tripalmata Beklemischev, 1927 -- invalid
  Polycystis yagana Marcus, 1954 -- valid
  Polyphalloplana de Beauchamp, 1951 -- valid
  Polyphalloplana bocki de Beauchamp, 1951 -- valid
  Polyporus Plehn, 1897 -- valid
  Polyporus caecus Plehn, 1897 -- valid
  Polyposthia Bergendal, 1893 -- valid
  Polyposthia similis Bergendal, 1893 -- valid
  Polyposthides Palombi, 1923 -- valid
  Polyposthides affinis Palombi, 1923 -- valid
  Polyposthides caraibica Palombi, 1923 -- valid
  Polyposthides karimalensis Palombi, 1924 -- invalid
  Polyposthides karimatensis Palombi, 1924 -- valid
  Polyposthiidae Bergendal, 1893 -- valid
  Polyrhabdoplana Ax and Ax, 1967 -- valid
  Polyrhabdoplana perforata Tajika, 1983 -- valid
  Polyrhabdoplana posttestis Ax and Ax, 1967 -- valid
  Polysolenoposthia Steinböck, 1932 -- invalid
  Polysolenoposthia bathycola Steinböck and Lanser, 1932 -- invalid
  Polysolenoposthia porsildi Steinböck and Lanser, 1932 -- invalid
  Polystyliphora Ax, 1958 -- valid
  Polystyliphora australiensis Faubel and Rohde, 1998 -- valid
  Polystyliphora axi Curini-Galletti and Martens, 1991 -- valid
  Polystyliphora cannoni Curini-Galletti, 1998 -- valid
  Polystyliphora darwini Ax and Ax, 1974 -- valid
  Polystyliphora eilatensis Curini-Galletti and Martens, 1991 -- valid
  Polystyliphora filum Ax, 1958 -- valid
  Polystyliphora karlingi Curini-Galletti and Martens, 1991 -- valid
  Polystyliphora marisrubri Curini-Galletti and Martens, 1991 -- valid
  Polystyliphora novaehollandiae Curini-Galletti, 1998 -- valid
  Polystyliphora persimilis Curini-Galletti, 1998 -- valid
  Polystyliphora portistephensii Curini-Galletti, 1998 -- valid
  Polystyliphora queenslandica Curini-Galletti, 1998 -- valid
  Polystyliphoridae Ax, 1958 -- valid
  Pontaralia Mack-Fira, 1968 -- valid
  Pontaralia beklemischevi Mack-Fira, 1968 -- valid
  Pontaralia relicta (Beklemischev, 1927) -- valid
  Pontaralia spinosa (Beklemischev, 1927) -- invalid
  Porfirievia Timoshkin, 1997 -- valid
  Porfirievia barguzinensis Timoshkin, 1997 -- valid
  Porfirievia bathyalis Timoshkin, 1997 -- valid
  Porfirievia ermakovi Timoshkin, 1997 -- valid
  Porfirievia kawanabei Timoshkin, 1997 -- valid
  Porfirievia minima (Timoshkin and Zabrovskaya, 1985) -- valid
  Porfirievia schirobokovi Timoshkin, 1997 -- valid
  Porfirievia xantha Timoshkin, 1997 -- valid
  Porrocystidinae Evdonin, 1977 -- invalid
  Porrocystis Reisinger, 1926 -- valid
  Porrocystis assimilis (Levinsen, 1879) -- valid
  Porrocystis drygalskii Reisinger, 1926 -- invalid
  Poseidoplanella Willems, Artois, Vermin, Backeljau and Schockaert, 2005 -- valid
  Poseidoplanella halleti Willems, Artois, Vermin, Backeljau and Schockaert, 2005 -- valid
  Postaphanostoma Dörjes, 1968 -- valid
  Postaphanostoma atriomagnum Dörjes, 1968 -- valid
  Postaphanostoma filum Dörjes, 1968 -- valid
  Postaphanostoma glandulosum Dörjes, 1968 -- valid
  Postaphanostoma nilssoni Kċnneby and Jondelius, 2013 -- valid
  Postbursoplana Ax, 1956 -- valid
  Postbursoplana donoraticensis Meini, 2015 -- valid
  Postbursoplana fibulata Ax, 1956 -- valid
  Postbursoplana macromystax Lanfranchi, 1969 -- valid
  Postbursoplana minima Ax, 1956 -- valid
  Postbursoplana parafibulata Lanfranchi, Melai and Meini, 2010 -- valid
  Postbursoplana pontica Ax, 1959 -- valid
  Postbursoplana propontica Ax, 1959 -- valid
  Postbursoplana tyrrhenica Lanfranchi, 1969 -- valid
  Postenterogonia Faubel, 1983 -- valid
  Postenterogonia orbicularis (Schmarda, 1859) -- valid
  Posticopora Kozloff, 2000 -- valid
  Posticopora luteopunctata (Ehlers and Dörjes, 1979) -- valid
  Postmecynostomum Dörjes, 1968 -- valid
  Postmecynostomum glandulosum (Westblad, 1946) -- valid
  Postmecynostomum pictum Dörjes, 1968 -- valid
  Praeanaperus Faubel and Regier, 1983 -- valid
  Praeanaperus tetraposthia Faubel and Regier, 1983 -- valid
  Praeaphanostoma Dörjes, 1968 -- valid
  Praeaphanostoma brevifrons Dörjes, 1968 -- valid
  Praeaphanostoma chaetocaudatum Dörjes, 1968 -- valid
  Praeaphanostoma foramivora Hooge and Tyler, 2008 -- valid
  Praeaphanostoma gusana Hooge and Eppinger, 2005 -- valid
  Praeaphanostoma longum Dörjes, 1968 -- valid
  Praeaphanostoma lutheri (Westblad, 1946) -- invalid
  Praeaphanostoma musculosum Ehlers and Dörjes, 1979 -- valid
  Praeaphanostoma parvum Rieger and Ott, 1971 -- valid
  Praeaphanostoma rubrum Dörjes, 1968 -- valid
  Praeaphanostoma sizilianum (Riedl, 1954) -- valid
  Praeaphanostoma thalasophilum Ehlers and Dörjes, 1979 -- valid
  Praeaphanostoma vitreum Ehlers and Dörjes, 1979 -- valid
  Praeaphanostoma wadsworthi Hooge and Tyler, 2003 -- valid
  Praebursoplana Ax, 1956 -- valid
  Praebursoplana reisingeri Ax, 1956 -- valid
  Praebursoplana steinboecki Ax, 1956 -- valid
  Praebursoplana subsalina Ax, 1956 -- valid
  Praeconvoluta Dörjes, 1968 -- valid
  Praeconvoluta bocasensis Hooge and Tyler, 2008 -- valid
  Praeconvoluta castinea Hooge and Tyler, 2003 -- valid
  Praeconvoluta karinae Dörjes, 1968 -- valid
  Praeconvoluta minor Faubel, 1974 -- valid
  Praeconvoluta schmidti Faubel, 1977 -- valid
  Praeconvoluta stephania Faubel and Regier, 1983 -- valid
  Praeconvoluta tigrina Hooge and Tyler, 2003 -- valid
  Praeconvoluta tigrinus Hooge, 2001 -- invalid
  Praeconvoluta tornuva Tyler and Hooge, 1999 -- valid
  Praesagittifera Kostenko and Mamkaev, 1990 -- valid
  Praesagittifera gracilis (Yamasu, 1982) -- valid
  Praesagittifera naikaiensis (Yamasu, 1982) -- valid
  Praesagittifera shikoki Kostenko and Mamkaev, 1990 -- valid
  Praestheceraeus Faubel, 1984 -- valid
  Praestheceraeus bellostriatus (Hyman, 1953) -- valid
  Pratoplana Ax, 1960 -- valid
  Pratoplana ayorae Ehlers and Sopott-Ehlers, 1989 -- valid
  Pratoplana galeata Ehlers, 1974 -- valid
  Pratoplana salsa Ax, 1960 -- valid
  Pregermarium Stirewalt, Ferguson and Kepner, 1942 -- valid
  Pregermarium beaufortensis Stirewalt, Ferguson and Kepner, 1942 -- valid
  Pregermarium carolinensis Stirewalt, Ferguson and Kepner, 1942 -- valid
  Preminona Karling, 1966 -- valid
  Preminona insularis (Meixner, 1928) -- valid
  Prevortex Ferroniere, 1901 -- invalid
  Prevortex balticus (Schultze, 1851) -- invalid
  Proactinoposthia Dörjes, 1968 -- invalid
  Proactinoposthia pelophila Dörjes, 1968 -- invalid
  Proamphibolella An der Lan, 1939 -- valid
  Proamphibolella sanctinaumi An der Lan, 1939 -- valid
  Proamphibolella simplex An der Lan, 1939 -- valid
  Proantropora Mamkaev, 1967 -- invalid
  Proantropora murmanicus Mamkaev, 1967 -- invalid
  Proaphanostoma Dörjes, 1972 -- valid
  Proaphanostoma An der Lan, 1936 -- invalid
  Proaphanostoma tenuissima (Westblad, 1946) -- valid
  Proaphanostoma variabile Steinböck and Lanser, 1932 -- invalid
  Proaphanostoma viride (An der Lan, 1936) -- invalid
  Probursa Hyman, 1944 -- valid
  Probursa moei Correa, 1960 -- valid
  Probursa veneris Hyman, 1944 -- valid
  Probursinae Hyman, 1944 -- invalid
  Procerodella Sluys, 1989 -- valid
  Procerodella asahinai (Kato, 1943) -- valid
  Procerodella cervix Sluys and Kawakatsu, 2005 -- valid
  Procerodella japonica (Kato, 1955) -- valid
  Procerodella macrostoma (Darwin, 1844) -- valid
  Procerodes Girard, 1850 -- valid
  Procerodes anatolicus (Benazzi, 1981) -- valid
  Procerodes asahinai Kato, 1943 -- invalid
  Procerodes australis Sluys, 1989 -- valid
  Procerodes canadensis (Hyman, 1953) -- invalid
  Procerodes dahli Marcus and Marcus, 1959 -- valid
  Procerodes dohrni Wilhelmi, 1909 -- valid
  Procerodes frequens (Leidy, 1855) -- invalid
  Procerodes gerlachei Böhmig, 1907 -- invalid
  Procerodes graciliceps (Stimpson, 1857) -- invalid
  Procerodes graffi (Böhmig, 1893) -- invalid
  Procerodes grisea Verrill, 1873 -- invalid
  Procerodes hallezi Böhmig, 1908 -- invalid
  Procerodes harmsi Lehmensick, 1937 -- invalid
  Procerodes ireneae Hartog, 1968 -- invalid
  Procerodes japonica Kato, 1955 -- invalid
  Procerodes jaqueti Böhmig, 1906 -- invalid
  Procerodes kerguelenensis Hyman, 1958 -- invalid
  Procerodes lacteus Ijima and Kaburaki, 1916 -- valid
  Procerodes limuli Ijima and Kaburaki, 1916 -- invalid
  Procerodes litoralis (O. F. Müller, 1776) -- invalid
  Procerodes littoralis Beneden, 1860 -- invalid
  Procerodes littoralis (O. F. Müller, 1776) -- valid
  Procerodes lobatus (Schmidt, 1861) -- valid
  Procerodes lobatus lobatus (Schmidt, 1861) -- valid
  Procerodes lobatus solowetzkianus Sabussow, 1900 -- valid
  Procerodes macrostoma (Darwin, 1844) -- invalid
  Procerodes marginata Hallez, 1906 -- invalid
  Procerodes munda Wilhelmi, 1911 -- invalid
  Procerodes ohlini (Bergendal, 1899) -- invalid
  Procerodes pacificus Hyman, 1954 -- valid
  Procerodes plebeius (Schmidt, 1861) -- valid
  Procerodes sameha Marcus and Marcus, 1959 -- invalid
  Procerodes sanderi Hauser, 1987 -- invalid
  Procerodes segmentata (Lang, 1881) -- invalid
  Procerodes segmentatoides (Bergendal, 1899) -- invalid
  Procerodes solowetzkiana Sabussow, 1900 -- invalid
  Procerodes trigonocephala Ijima and Kaburaki, 1916 -- invalid
  Procerodes trilobata (Stimpson, 1857) -- invalid
  Procerodes ulvae (Ĝrsted, 1843) -- invalid
  Procerodes variabilis (Böhmig, 1902) -- valid
  Procerodes variabilis isabellina (Böhmig, 1902) -- valid
  Procerodes variabilis variabilis (Böhmig, 1902) -- valid
  Procerodes wandeli Hallez, 1906 -- invalid
  Procerodes warreni (Girard, 1850) -- invalid
  Procerodes wheatlandi Girard, 1850 -- invalid
  Procerodidae Diesing, 1862 -- valid
  Procerodinae Diesing, 1862 -- invalid
  Procerodoidea Diesing, 1862 -- valid
  Proceropharynx Ehlers, 1972 -- valid
  Proceropharynx anophthalmus (Meixner, 1929) -- valid
  Proceropharynx litoralis Ehlers, 1972 -- valid
  Proceropharynx profundum Willems, Sandberg and Jondelius, 2007 -- valid
  Proceros Quatrefage, 1845 -- invalid
  Proceros albicornis Stimpson, 1857 -- invalid
  Proceros argus Quatrefage, 1845 -- invalid
  Proceros aurantiacus (Delle Chiaje, 1822) -- invalid
  Proceros auritus (Claparède, 1861) -- invalid
  Proceros buskii Collingwood, 1876 -- invalid
  Proceros cardiosorus (Schmarda, 1859) -- invalid
  Proceros concinnus Collingwood, 1876 -- invalid
  Proceros cristatus Quatrefage, 1845 -- invalid
  Proceros hancockanus Collingwood, 1876 -- invalid
  Proceros limbatus (Leuckart, 1828) -- invalid
  Proceros lobianchii Lang, 1879 -- invalid
  Proceros melobesiarum Schmidtlein, 1880 -- invalid
  Proceros miniatus (Schmarda, 1859) -- invalid
  Proceros nigrocinctus (Schmarda, 1859) -- invalid
  Proceros orbicularis (Schmarda, 1859) -- invalid
  Proceros sanguinolentus Quatrefage, 1845 -- invalid
  Proceros striatus (Schmarda, 1859) -- invalid
  Proceros superbus (Schmarda, 1859) -- invalid
  Proceros tuberculatus Schmidtlein, 1880 -- invalid
  Proceros velutinus Blanchard, 1847 -- invalid
  Proceros violaceus (Schmarda, 1859) -- invalid
  Proceros zebra (Leuckart, 1828) -- invalid
  Procheliplana Meixner, 1938 -- invalid
  Procheliplana magnifica Meixner, 1938 -- invalid
  Proconvoluta Dörjes, 1968 -- valid
  Proconvoluta primitiva Dörjes, 1968 -- valid
  Procotyla Leidy, 1857 -- valid
  Procotyla armatus Korotneff, 1912 -- valid
  Procotyla baicalensis Sabussow, 1903 -- invalid
  Procotyla fluviatilis Leidy, 1857 -- valid
  Procotyla leidyi Girard, 1893 -- valid
  Procotyla magnus Korotneff, 1912 -- invalid
  Procotyla typhlops Kenk, 1935 -- valid
  Proderostoma Hallez, 1908 -- invalid
  Proderostoma cardii (Hallez, 1908) -- invalid
  Prognathorhynchus Meixner, 1929 -- valid
  Prognathorhynchus anophthalmus Meixner, 1929 -- invalid
  Prognathorhynchus busheki Ax, 1997 -- valid
  Prognathorhynchus campylostylus Karling, 1947 -- valid
  Prognathorhynchus canaliculatus Karling, 1947 -- valid
  Prognathorhynchus dividibulbosus Ax and Armonies, 1990 -- valid
  Prognathorhynchus dubius Meixner, 1929 -- valid
  Prognathorhynchus eurytuba Ax and Armonies, 1987 -- valid
  Prognathorhynchus karlingi Ax, 1953 -- valid
  Prognathorhynchus lacteus Evdonin, 1971 -- valid
  Prognathorhynchus parvulus Brunet, 1973 -- valid
  Prognathorhynchus stilofer Schilke, 1970 -- invalid
  Prognathorhynchus typhlus L'Hardy, 1964 -- valid
  Progyrator Sekera, 1901 -- valid
  Progyrator mamertinus (Graff, 1874) -- valid
  Progyrator reticulatus Sekera, 1901 -- invalid
  Prolatocestus Faubel, 1983 -- valid
  Prolatocestus ocellatus (Marcus, 1947) -- valid
  Prolecithophora Karling, 1940 -- invalid
  Prolecithoplana Karling, 1940 -- invalid
  Prolecithoplana lutheri Karling, 1940 -- invalid
  Promacrostomum An der Lan, 1939 -- valid
  Promacrostomum gieysztori (Ferguson, 1939) -- invalid
  Promacrostomum palum Sluys, 1986 -- valid
  Promacrostomum paradoxicum An der Lan, 1939 -- invalid
  Promacrostomum paradoxum An der Lan, 1939 -- valid
  Promesostoma Graff, 1882 -- valid
  Promesostoma agile (Levinsen, 1879) -- invalid
  Promesostoma alaskanum Ax and Armonies, 1990 -- valid
  Promesostoma balticum Luther, 1918 -- valid
  Promesostoma bilineatum Pereyaslawzewa, 1892 -- valid
  Promesostoma bilobatum Ax and Armonies, 1987 -- valid
  Promesostoma bipartitum Ax, 1956 -- valid
  Promesostoma caligulatum Ax, 1952 -- valid
  Promesostoma cochleare Karling, 1935 -- valid
  Promesostoma dennisalleni Ax, 1995 -- valid
  Promesostoma digitosum Ax, 1995 -- valid
  Promesostoma dipterostylum Karling, 1967 -- valid
  Promesostoma ellipticum (Uljanin, 1870) -- valid
  Promesostoma elongatulum (Uljanin, 1870) -- valid
  Promesostoma ensifer (Uljanin, 1870) -- valid
  Promesostoma ericae Faubel, 1980 -- invalid
  Promesostoma excellens Meixner, 1938 -- invalid
  Promesostoma fibulatum Ax and Armonies, 1987 -- valid
  Promesostoma gallicum Ax, 1956 -- valid
  Promesostoma gracilis Ax, 1951 -- valid
  Promesostoma graffi (Mereschkowsky, 1878) -- invalid
  Promesostoma hamatum Beklemischev, 1953 -- valid
  Promesostoma hamiferumm Meixner, 1938 -- invalid
  Promesostoma hymanae Ax, 1968 -- valid
  Promesostoma infundibulum Ax, 1968 -- valid
  Promesostoma karlingi Ehlers, 1974 -- valid
  Promesostoma kergroixense Ehlers and Sopott-Ehlers, 1989 -- valid
  Promesostoma kristenseni Ax, 1993 -- valid
  Promesostoma lenticulatum (Schmidt, 1852) -- valid
  Promesostoma lugubra Meixner, 1938 -- invalid
  Promesostoma maculosum Ax, 1956 -- valid
  Promesostoma marmoratum (Schultze, 1851) -- valid
  Promesostoma marmoratum groenlandicum (Levinsen, 1879) -- invalid
  Promesostoma marmoratum marmoratum (Schultze, 1851) -- valid
  Promesostoma marmoratum nudum Graff, 1905 -- valid
  Promesostoma marmoratum solowetzkianum Sabussow, 1897 -- invalid
  Promesostoma meixneri Ax, 1951 -- valid
  Promesostoma meixneri meixneri Ax, 1951 -- valid
  Promesostoma meixneri roscoffensis Ehlers, 1980 -- valid
  Promesostoma minima Pereyaslawzewa, 1892 -- invalid
  Promesostoma minutum Ax, 1956 -- valid
  Promesostoma murmanica Graff, 1905 -- invalid
  Promesostoma neglectum Karling, 1967 -- valid
  Promesostoma norvegicum Karling, 1967 -- valid
  Promesostoma nynaesiensis Karling, 1957 -- valid
  Promesostoma ovoideum (Schmidt, 1852) -- valid
  Promesostoma ovoideum ovoideum (Schmidt, 1852) -- valid
  Promesostoma ovoideum purum Graff, 1905 -- valid
  Promesostoma pachidermum Pereyaslawzewa, 1892 -- invalid
  Promesostoma paracochlearis Ax, 1952 -- valid
  Promesostoma pedicellatum Pereyaslawzewa, 1892 -- invalid
  Promesostoma rostratum Ax, 1951 -- valid
  Promesostoma sartagine Ax and Ehlers, 1973 -- valid
  Promesostoma scylax Marcus, 1952 -- valid
  Promesostoma serpentistylum Ax, 1952 -- valid
  Promesostoma solea (Schmidt, 1857) -- valid
  Promesostoma solea inornatum Graff, 1905 -- valid
  Promesostoma solea solea (Schmidt, 1857) -- valid
  Promesostoma spirale Beklemischev, 1953 -- valid
  Promesostoma spiriferum Karling, 1967 -- valid
  Promesostoma tenebrosum Ax and Ehlers, 1973 -- valid
  Promesostoma teshirogii Ax, 1992 -- valid
  Promesostomidae -- valid
  Promesostominae -- valid
  Promonotinae Marcus, 1949 -- invalid
  Promonotus Beklemischev, 1927 -- valid
  Promonotus arcassonensis Ax, 1959 -- valid
  Promonotus brevirostris (Steinböck, 1932) -- invalid
  Promonotus erinaceus Marcus, 1950 -- valid
  Promonotus groenlandicus (Steinböck, 1932) -- invalid
  Promonotus hyrcanus Beklemischev, 1927 -- valid
  Promonotus longirostris (Steinböck, 1932) -- invalid
  Promonotus marci Ax, 1954 -- valid
  Promonotus orientalis Beklemischev, 1927 -- valid
  Promonotus orthocirrus Karling, 1967 -- valid
  Promonotus pardus Marcus, 1954 -- invalid
  Promonotus ponticus Ax, 1959 -- valid
  Promonotus psilus Marcus, 1954 -- invalid
  Promonotus schultzei Meixner, 1943 -- valid
  Promonotus sphaerobursa Martens and Curini-Galletti, 1999 -- valid
  Promonotus spinosissimus Martens and Curini-Galletti, 1999 -- valid
  Promonotus villacae Marcus, 1949 -- valid
  Promonotus wilsoni (Stirewalt, Kepner and Ferguson, 1940) -- valid
  Proporata Reisinger, 1924 -- invalid
  Proporidae Graff, 1882 -- valid
  Proporoplana Reisinger, 1935 -- invalid
  Proporoplana jenseni Reisinger, 1935 -- invalid
  Proporus Schmidt, 1848 -- valid
  Proporus bermudensis Hooge and Tyler, 2002 -- valid
  Proporus brochii Westblad, 1946 -- valid
  Proporus carolinensis Hooge and Smith, 2004 -- valid
  Proporus cyclops Schmidt, 1848 -- invalid
  Proporus lonchitis Dörjes, 1971 -- valid
  Proporus minimus (An der Lan, 1936) -- valid
  Proporus rubropunctatus O. Schmidt, 1852 -- invalid
  Proporus venenosus (Schmidt, 1852) -- valid
  Proporus venenosus venenosus (Schmidt, 1852) -- valid
  Proporus venenosus violaceous Graff, 1882 -- valid
  Proporus venenosus viridiflavus Riedl, 1959 -- valid
  Proporus viridis (Busch, 1851) -- invalid
  Propozonopora Riedl, 1954 -- invalid
  Prorhynchella Ruebush, 1939 -- valid
  Prorhynchella minuta Ruebush, 1939 -- valid
  Prorhynchidae Hallez, 1894 -- valid
  Prorhynchopsis de Beauchamp, 1912 -- valid
  Prorhynchopsis minuta de Beauchamp, 1913 -- valid
  Prorhynchus Schultze, 1851 -- valid
  Prorhynchus alpinus Steinböck, 1924 -- valid
  Prorhynchus applanatus Kennel, 1888 -- invalid
  Prorhynchus baikalensis Timoshkin, 1991 -- valid
  Prorhynchus balticus Kennel, 1883 -- invalid
  Prorhynchus brincki Marcus, 1955 -- valid
  Prorhynchus complanatus Kennel, 1888 -- invalid
  Prorhynchus curvistylus Braun, 1885 -- invalid
  Prorhynchus fluviatilis Leydig, 1854 -- invalid
  Prorhynchus fontinalis Vejdovsky, 1895 -- valid
  Prorhynchus hastatus Steinböck, 1924 -- valid
  Prorhynchus haswelli Steinböck and Reisinger, 1924 -- invalid
  Prorhynchus hygrophilus Vejdovsky, 1895 -- invalid
  Prorhynchus leuckarti Zacharias, 1886 -- invalid
  Prorhynchus maximus Zacharias, 1888 -- invalid
  Prorhynchus metameroides de Beauchamp, 1913 -- invalid
  Prorhynchus ponticus Steinböck, 1927 -- valid
  Prorhynchus putealis Haswell, 1898 -- valid
  Prorhynchus rivularis Fedschenko, 1872 -- invalid
  Prorhynchus serpentinus (Dalyell, 1853) -- invalid
  Prorhynchus sphyrocephalus (de Man, 1876) -- invalid
  Prorhynchus stagnalis Schultze, 1851 -- valid
  Prorhynchus stagnalis biwaensis Timoshkin, Grygier and Kawakatsu, 2004 -- valid
  Prorhynchus stagnalis interstitialis An der Lan, 1967 -- valid
  Prorhynchus stagnalis stagnalis Schultze, 1851 -- valid
  Prorhynchus tasmaniensis Hickman, 1933 -- valid
  Prorhynchus tenuis Girard, 1894 -- invalid
  Prorogonophora Riedl, 1954 -- valid
  Prorogonophora perspicua Riedl, 1954 -- valid
  Proschizorhynchella Schilke, 1970 -- valid
  Proschizorhynchella atopus (Marcus, 1950) -- valid
  Proschizorhynchella bivaginata (Schilke, 1970) -- valid
  Proschizorhynchella echinulata (L'Hardy, 1965) -- valid
  Proschizorhynchella faeroeensis (Steinböck, 1931) -- valid
  Proschizorhynchella helgolandica (Karling and L'Hardy, 1965) -- valid
  Proschizorhynchella inflata Karling, 1989 -- valid
  Proschizorhynchella lingulata Karling, 1989 -- valid
  Proschizorhynchella nahantensis (Doe, 1974) -- valid
  Proschizorhynchella oculata (Meixner, 1928) -- valid
  Proschizorhynchella pacifica (Evdonin, 1969) -- valid
  Proschizorhynchella papillata (Doe, 1974) -- valid
  Proschizorhynchella robusta Noldt, 1989 -- valid
  Proschizorhynchella schilkei Karling, 1989 -- valid
  Proschizorhynchella spiracirro (Schilke, 1970) -- valid
  Proschizorhynchoides Noldt, 1989 -- valid
  Proschizorhynchoides macrostylus (L'Hardy, 1963) -- valid
  Proschizorhynchus Meixner, 1928 -- valid
  Proschizorhynchus (Proschizorhynchella) Schilke, 1970 -- invalid
  Proschizorhynchus (Proschizorhynchus) Meixner, 1938 -- invalid
  Proschizorhynchus anophthalmus L'Hardy, 1965 -- valid
  Proschizorhynchus arenarius (de Beauchamp, 1927) -- valid
  Proschizorhynchus atopus Marcus, 1950 -- invalid
  Proschizorhynchus bivaginatus Schilke, 1970 -- invalid
  Proschizorhynchus echinulatus L'Hardy, 1965 -- invalid
  Proschizorhynchus faeroeensis Steinböck, 1931 -- invalid
  Proschizorhynchus gullmarensis Karling, 1950 -- valid
  Proschizorhynchus gullmarensis tricingulatus Ax, 1959 -- invalid
  Proschizorhynchus helgolandicus Karling and L'Hardy, 1965 -- invalid
  Proschizorhynchus lunatus Brunet, 1970 -- valid
  Proschizorhynchus nahantensis Doe, 1974 -- invalid
  Proschizorhynchus oculatus Meixner, 1928 -- invalid
  Proschizorhynchus pacificus Evdonin, 1969 -- invalid
  Proschizorhynchus papillatus Doe, 1974 -- invalid
  Proschizorhynchus pectinatus L'Hardy, 1965 -- valid
  Proschizorhynchus reniformis Brunet, 1970 -- valid
  Proschizorhynchus spiracirro Schilke, 1970 -- invalid
  Proschizorhynchus tricingulatus Ax, 1959 -- valid
  Proschizorhynchus triductibus Schilke, 1970 -- valid
  Prosencephalus Uljanin, 1870 -- invalid
  Prosencephalus pulchellus Uljanin, 1870 -- invalid
  Proseriata Meixner, 1938 -- invalid
  Prosogynopora Laumer and Curini-Galletti, 2014 -- valid
  Prosogynopora riseri Laumer and Curini-Galletti, 2014 -- valid
  Prostheceraeus Schmarda, 1859 -- valid
  Prostheceraeus albicornis (Stimpson, 1857) -- invalid
  Prostheceraeus albocinctus Lang, 1884 -- valid
  Prostheceraeus anomalus Haswell, 1907 -- valid
  Prostheceraeus argus (Quatrefage, 1845) -- valid
  Prostheceraeus bellostriatus Hyman, 1953 -- invalid
  Prostheceraeus clavicornis Schmarda, 1859 -- invalid
  Prostheceraeus cornutus (O. F. Müller, 1776) -- invalid
  Prostheceraeus cristatus (Quatrefage, 1845) -- invalid
  Prostheceraeus flavomaculatus Graff, 1893 -- invalid
  Prostheceraeus flavomarginatus (Ehrenberg, 1831) -- valid
  Prostheceraeus floridanus Hyman, 1955 -- valid
  Prostheceraeus giesbrechtii Lang, 1884 -- valid
  Prostheceraeus hancockanus (Collingwood, 1876) -- invalid
  Prostheceraeus japonicus (Stimpson, 1857) -- invalid
  Prostheceraeus kelaarti (Collingwood, 1876) -- invalid
  Prostheceraeus kelaartii (Collingwood, 1876) -- invalid
  Prostheceraeus latissimus Schmarda, 1859 -- invalid
  Prostheceraeus maculosus (Verrill, 1892) -- valid
  Prostheceraeus meleagrinus (Kelaart, 1858) -- valid
  Prostheceraeus microceraeus Schmarda, 1859 -- invalid
  Prostheceraeus moseleyi Lang, 1884 -- valid
  Prostheceraeus niger (Stimpson, 1857) -- invalid
  Prostheceraeus nigricornis Schmarda, 1859 -- invalid
  Prostheceraeus nigricornus Schmarda, 1859 -- valid
  Prostheceraeus panamensis Woodworth, 1894 -- valid
  Prostheceraeus papilio (Kelaart, 1858) -- invalid
  Prostheceraeus pseudolimax Lang, 1884 -- valid
  Prostheceraeus roseus Lang, 1884 -- valid
  Prostheceraeus rubropunctatus Lang, 1884 -- valid
  Prostheceraeus terricola Schmarda, 1859 -- valid
  Prostheceraeus undulatus (Kelaart, 1858) -- invalid
  Prostheceraeus violaceus (Delle Chiaje, 1822) -- valid
  Prostheceraeus viridis Schmarda, 1859 -- invalid
  Prostheceraeus vittatus (Montagu, 1815) -- valid
  Prostheceraeus zebra Hyman, 1955 -- valid
  Prosthiostomidae Lang, 1884 -- valid
  Prosthiostomum Quatrefage, 1845 -- valid
  Prosthiostomum affine Stimpson, 1857 -- invalid
  Prosthiostomum angustum Bock, 1913 -- invalid
  Prosthiostomum arctum Quatrefage, 1845 -- invalid
  Prosthiostomum asiaticum Kato, 1937 -- valid
  Prosthiostomum aurantiacum (Collingwood, 1876) -- valid
  Prosthiostomum auratum Kato, 1937 -- invalid
  Prosthiostomum awaensa Yeri and Kaburaki, 1918 -- valid
  Prosthiostomum awaense Yeri and Kaburaki, 1918 -- invalid
  Prosthiostomum bellum Kato, 1939 -- invalid
  Prosthiostomum capense Bock, 1931 -- valid
  Prosthiostomum collare (Stimpson, 1855) -- valid
  Prosthiostomum constipatum Stimpson, 1857 -- valid
  Prosthiostomum cooperi Laidlaw, 1902 -- valid
  Prosthiostomum crassiusculum Stimpson, 1857 -- valid
  Prosthiostomum cribrarium Stimpson, 1857 -- valid
  Prosthiostomum cyclops (Verrill, 1901) -- valid
  Prosthiostomum cynarium Marcus, 1950 -- valid
  Prosthiostomum delicatum Palombi, 1939 -- invalid
  Prosthiostomum dohrnii Lang, 1884 -- valid
  Prosthiostomum drygalskii Bock, 1931 -- invalid
  Prosthiostomum elegans Laidlaw, 1902 -- valid
  Prosthiostomum elongatum Quatrefage, 1845 -- invalid
  Prosthiostomum emarginatum Leuckart, 1863 -- invalid
  Prosthiostomum exiguum Hyman, 1959 -- invalid
  Prosthiostomum formosum Kato, 1943 -- valid
  Prosthiostomum gabriellae Marcus, 1949 -- invalid
  Prosthiostomum gilvum Marcus, 1950 -- valid
  Prosthiostomum gracile Girard, 1850 -- invalid
  Prosthiostomum grande Stimpson, 1857 -- valid
  Prosthiostomum griseum Hyman, 1959 -- valid
  Prosthiostomum hamatum Schmidt, 1861 -- invalid
  Prosthiostomum katoi Poulter, 1975 -- invalid
  Prosthiostomum komaii Kato, 1944 -- valid
  Prosthiostomum laetum Kato, 1938 -- invalid
  Prosthiostomum latocelis Hyman, 1953 -- valid
  Prosthiostomum lineatum Meixner, 1907 -- valid
  Prosthiostomum lobatum Pearse, 1938 -- valid
  Prosthiostomum macrorhynchum (Schmarda, 1859) -- valid
  Prosthiostomum maculatum Haswell, 1907 -- valid
  Prosthiostomum marmoratum Yeri and Kaburaki, 1918 -- valid
  Prosthiostomum matarazzoi Marcus, 1950 -- invalid
  Prosthiostomum milcum Marcus and Marcus, 1968 -- valid
  Prosthiostomum molle Freeman, 1930 -- invalid
  Prosthiostomum monosorum (Schmarda, 1859) -- invalid
  Prosthiostomum montiporae Poulter, 1975 -- valid
  Prosthiostomum multicelis Hyman, 1953 -- valid
  Prosthiostomum nationale Plehn, 1896 -- valid
  Prosthiostomum nationalis Plehn, 1896 -- invalid
  Prosthiostomum notoensis Kato, 1944 -- valid
  Prosthiostomum nozakensis Kato, 1944 -- valid
  Prosthiostomum obscurum (Stimpson, 1855) -- valid
  Prosthiostomum ohshimae (Kato, 1938) -- invalid
  Prosthiostomum ostreae Kato, 1937 -- valid
  Prosthiostomum pallidum Laidlaw, 1903 -- valid
  Prosthiostomum parvicelis Hyman, 1939 -- valid
  Prosthiostomum pellucidum (Grube, 1840) -- valid
  Prosthiostomum pulchrum Bock, 1913 -- invalid
  Prosthiostomum purum Kato, 1937 -- valid
  Prosthiostomum rubropunctatum Yeri and Kaburaki, 1918 -- valid
  Prosthiostomum russoi Palombi, 1939 -- invalid
  Prosthiostomum sadoensis Kato, 1944 -- valid
  Prosthiostomum sancum Du Bois-Reymond Marcus, 1965 -- valid
  Prosthiostomum singulare Laidlaw, 1904 -- invalid
  Prosthiostomum siphunculus (Delle Chiaje, 1822) -- valid
  Prosthiostomum sonorum Kato, 1938 -- valid
  Prosthiostomum sparsum (Stimpson, 1855) -- valid
  Prosthiostomum suzakiensis Kato, 1944 -- valid
  Prosthiostomum tenebrosum Stimpson, 1857 -- invalid
  Prosthiostomum trilineatum Yeri and Kaburaki, 1920 -- valid
  Prosthiostomum utarum Marcus, 1952 -- valid
  Prosthiostomum vulgare Kato, 1938 -- valid
  Prosthiostomum vulgaris Kato, 1938 -- invalid
  Prosthiostomum wagurenisis Kato, 1944 -- invalid
  Prosthiostomum wagurensis Kato, 1944 -- valid
  Prosthiostomum yeri Kato, 1937 -- valid
  Prosthiostomum yerii Kato, 1937 -- invalid
  Prostomum A. L. Dugès, 1828 -- invalid
  Prostomum armatum A. L. Dugès, 1830 -- invalid
  Prostomum banaticum Graff, 1875 -- invalid
  Prostomum boreale Mereschkowsky, 1878 -- invalid
  Prostomum botterii Schmidt, 1852 -- invalid
  Prostomum botterii pontica Czerniavsky, 1880 -- invalid
  Prostomum caledonicum Claparède, 1861 -- invalid
  Prostomum croceum (Fabricius, 1826) -- invalid
  Prostomum elipsinoideum A. L. Dugès, 1830 -- invalid
  Prostomum furiosum Schmidt, 1857 -- invalid
  Prostomum girardi Hallez, 1879 -- invalid
  Prostomum helgolandicus Metschnikoff, 1865 -- invalid
  Prostomum immundum Schmidt, 1857 -- invalid
  Prostomum keffersteinii Claparède, 1863 -- invalid
  Prostomum leucophraeus Ĝrsted, 1844 -- invalid
  Prostomum lineare Schultze and F. Müller, 1857 -- invalid
  Prostomum lineare coeca Vejdovsky, 1880 -- invalid
  Prostomum littorale Ĝrsted, 1843 -- invalid
  Prostomum mamertinum Graff, 1874 -- invalid
  Prostomum marginatum Leidy, 1847 -- invalid
  Prostomum papillatum Mereschkowsky, 1878 -- invalid
  Prostomum steenstrupii Schmidt, 1852 -- invalid
  Prostomum suboviformis Ĝrsted, 1843 -- invalid
  Protandrella Ehlers, Mueller and Franke, 1994 -- valid
  Protandrella cirrifera Ehlers, Mueller and Franke, 1994 -- valid
  Proteola Czerniavsky, 1880 -- invalid
  Proteola hyalina Czerniavsky, 1881 -- invalid
  Protoascus Hayes, 1941 -- valid
  Protoascus wisconsinensis Hayes, 1941 -- valid
  Protocotylus Korotneff, 1908 -- valid
  Protocotylus flavus Korotneff, 1908 -- valid
  Protocotylus flavus abissorum Timoshkin and Porfirieva, 1989 -- valid
  Protocotylus flavus flavus Korotneff, 1908 -- valid
  Protocotylus fungiformis (Sabussow, 1903) -- valid
  Protocotylus magnus (Korotneff, 1912) -- valid
  Protomacrostomum Steinböck, 1935 -- valid
  Protomacrostomum groenlandicum Steinböck, 1935 -- valid
  Protomonotresidae Reisinger, 1924 -- valid
  Protomonotresinae Reisinger, 1924 -- valid
  Protomonotresis Reisinger, 1924 -- valid
  Protomonotresis centrophora Reisinger, 1924 -- valid
  Protopharyngiella Schwank, 1980 -- valid
  Protopharyngiella buchonina Schwank, 1980 -- valid
  Protoplanella Reisinger, 1924 -- valid
  Protoplanella macrorhabdiphora An der Lan, 1955 -- valid
  Protoplanella simplex Reisinger, 1924 -- valid
  Protoplanellinae Reisinger, 1924 -- valid
  Provortex Graff, 1882 -- valid
  Provortex affinis (Jensen, 1878) -- valid
  Provortex balticus (Schultze, 1851) -- valid
  Provortex breviductus (Luther, 1918) -- invalid
  Provortex brevitubus Luther, 1918 -- invalid
  Provortex hispidus Graff, 1882 -- invalid
  Provortex impeditus Ax, 2008 -- valid
  Provortex karlingi Ax, 1951 -- valid
  Provortex littoralis Graff, 1882 -- valid
  Provortex pallidus Luther, 1948 -- valid
  Provortex psammophilus Meixner, 1938 -- valid
  Provortex punctatus (Levinsen, 1879) -- invalid
  Provortex rubrobacillus Gamble, 1893 -- valid
  Provortex sphagnorum (Sekera, 1912) -- valid
  Provortex tellinae Graff, 1882 -- invalid
  Provortex tubiferus Luther, 1948 -- valid
  Provortex virginiensis Ruebush and Hayes, 1939 -- valid
  Provorticidae Beklemischev, 1927 -- valid
  Provorticidorum Rixen, 1961 -- invalid
  Provorticinae Beklemischev, 1927 -- valid
  Proxenetes Jensen, 1878 -- valid
  Proxenetes (Apoxinetes) Ax, 1971 -- valid
  Proxenetes (Archixenetes) Ax, 1971 -- valid
  Proxenetes (Paraxenetes) Ax, 1971 -- valid
  Proxenetes (Perixenetes) Ax, 1971 -- valid
  Proxenetes (Proxenetes) Ax, 1971 -- valid
  Proxenetes affinis (Jensen, 1878) -- invalid
  Proxenetes ampullatus Ax, 1971 -- valid
  Proxenetes angustus Ax, 1951 -- valid
  Proxenetes arctica Ax and Armonies, 1990 -- valid
  Proxenetes arenarius Meixner, 1938 -- invalid
  Proxenetes axi Riedl, 1954 -- invalid
  Proxenetes bilioi Hartog, 1966 -- valid
  Proxenetes britannicus Hartog, 1966 -- valid
  Proxenetes chlorosticus (Schmidt, 1857) -- valid
  Proxenetes cimbricus Ax, 1971 -- valid
  Proxenetes cisorius Hartog, 1966 -- valid
  Proxenetes cochlear Graff, 1882 -- invalid
  Proxenetes cochlear Luther, 1948 -- invalid
  Proxenetes cochlear uncinatus Graff, 1882 -- invalid
  Proxenetes contortus Beklemischev, 1927 -- invalid
  Proxenetes deltoides Hartog, 1965 -- valid
  Proxenetes denhartogi Karling, 1978 -- invalid
  Proxenetes echinatus (Uljanin, 1870) -- invalid
  Proxenetes elegans Luther, 1948 -- invalid
  Proxenetes falcatus Ax, 1953 -- invalid
  Proxenetes fasciger Ehlers, 1974 -- valid
  Proxenetes filum Meixner, 1938 -- invalid
  Proxenetes flabellifer Jensen, 1878 -- valid
  Proxenetes flexus Ax, 1971 -- valid
  Proxenetes gracilis Graff, 1882 -- invalid
  Proxenetes inflatus Hartog, 1966 -- valid
  Proxenetes intermedius Hartog, 1966 -- valid
  Proxenetes karlingi Luther, 1943 -- valid
  Proxenetes lictor Beklemischev, 1927 -- invalid
  Proxenetes lutheri Hartog, 1966 -- valid
  Proxenetes mackfirae Karling, 1978 -- valid
  Proxenetes minimus Hartog, 1966 -- valid
  Proxenetes modestus Graff, 1911 -- invalid
  Proxenetes monotubulus Hartog, 1966 -- valid
  Proxenetes multidentatus Ax, 1971 -- valid
  Proxenetes paradoxus Pereyaslawzewa, 1892 -- invalid
  Proxenetes plebeius Beklemischev, 1927 -- invalid
  Proxenetes pratensis Ax, 1960 -- valid
  Proxenetes puccinellicola Ax, 1960 -- valid
  Proxenetes quadrispinosus Hartog, 1966 -- valid
  Proxenetes quinquespinosus Ax, 1971 -- valid
  Proxenetes reisingeri Riedl, 1959 -- invalid
  Proxenetes rosaceus Graff, 1882 -- valid
  Proxenetes segmentatus Hartog, 1966 -- valid
  Proxenetes sellai Steinböck, 1933 -- invalid
  Proxenetes sensitivus (Uljanin, 1870) -- invalid
  Proxenetes simplex Luther, 1948 -- valid
  Proxenetes steinboecki Riedl, 1959 -- invalid
  Proxenetes striatus (Uljanin, 1870) -- valid
  Proxenetes tenuispinosus Ehlers, 1974 -- valid
  Proxenetes trigonus Ax, 1960 -- valid
  Proxenetes trispinosus Artois, Vermin and Schockaert, 2000 -- valid
  Proxenetes tuberculatus Graff, 1882 -- invalid
  Proxenetes uncinatus Graff, 1882 -- valid
  Proxenetes unidentatus Hartog, 1965 -- valid
  Proxenetes westbladi Luther, 1943 -- invalid
  Proxenetinae Luther, 1948 -- invalid
  Psammomacrostomum Ax, 1966 -- valid
  Psammomacrostomum equicaudum Ax, 1966 -- valid
  Psammomacrostomum turbanelloides Karling, 1974 -- valid
  Psammopolycystidinae Evdonin, 1977 -- valid
  Psammopolycystis Meixner, 1938 -- valid
  Psammopolycystis bidens Meixner, 1938 -- valid
  Psammopolycystis bondensis Karling, 1956 -- valid
  Psammopolycystis bredungensis Karling, 1956 -- valid
  Psammopolycystis falcata Karling, 1956 -- valid
  Psammopolycystis forcipiens Brunet, 1979 -- valid
  Psammopolycystis riegeri Brunet, 1979 -- valid
  Psammopolycystis trilobata Brunet, 1979 -- valid
  Psammorhynchidae Karling, 1956 -- valid
  Psammorhynchus Meixner, 1938 -- valid
  Psammorhynchus tubulipenis Meixner, 1938 -- valid
  Pseudactinoposthia Dörjes, 1968 -- valid
  Pseudactinoposthia daena (Marcus, 1954) -- valid
  Pseudactinoposthia granaria Dörjes, 1968 -- valid
  Pseudactinoposthia parva Ehlers and Dörjes, 1979 -- valid
  Pseudactinoposthia saltans Dörjes, 1968 -- valid
  Pseudactinoposthia sanguineum (Beklemischev, 1915) -- invalid
  Pseudalloioplana Prudhoe, 1985 -- invalid
  Pseudalloioplana californica (Heath and McGregor, 1912) -- invalid
  Pseudanaperus Dörjes, 1968 -- invalid
  Pseudanaperus tinctus (Marcus, 1952) -- invalid
  Pseudaphanostoma Westblad, 1946 -- valid
  Pseudaphanostoma brevicaudatum Dörjes, 1968 -- valid
  Pseudaphanostoma divae Marcus, 1952 -- valid
  Pseudaphanostoma herringi Hooge and Rocha, 2006 -- valid
  Pseudaphanostoma hyalinorhabdoida Kċnneby and Jondelius, 2013 -- valid
  Pseudaphanostoma murmanicus (Mamkaev, 1967) -- valid
  Pseudaphanostoma opisthorchis (Mamkaev, 1967) -- invalid
  Pseudaphanostoma pelophilum Dörjes, 1968 -- valid
  Pseudaphanostoma psammophilum Dörjes, 1968 -- valid
  Pseudaphanostoma schillingi Hooge, 2011 -- invalid
  Pseudaphanostoma smithrii Hooge and Tyler, 2003 -- valid
  Pseudaphanostoma syltensis (Dörjes, 1968) -- valid
  Pseudaphanostoma variabilis Westblad, 1946 -- valid
  Pseudartiocotylus Ikeda, 1911 -- valid
  Pseudartiocotylus ceylonicus Ikeda, 1911 -- valid
  Pseudmecynostomum Dörjes, 1968 -- valid
  Pseudmecynostomum bathycolum (Westblad, 1948) -- invalid
  Pseudmecynostomum boreale Faubel, 1977 -- invalid
  Pseudmecynostomum bruneofilum Faubel, 1974 -- valid
  Pseudmecynostomum bruneum Dörjes, 1968 -- valid
  Pseudmecynostomum evelinae (Marcus, 1948) -- invalid
  Pseudmecynostomum flavescens (Dörjes, 1968) -- invalid
  Pseudmecynostomum folium Hooge and Tyler, 2003 -- valid
  Pseudmecynostomum fragilis Dörjes, 1968 -- invalid
  Pseudmecynostomum glandulosum (Westblad, 1946) -- invalid
  Pseudmecynostomum granulum Dörjes, 1968 -- invalid
  Pseudmecynostomum juistensis Dörjes, 1968 -- invalid
  Pseudmecynostomum macrobursalium (Westblad, 1946) -- invalid
  Pseudmecynostomum maritimum Dörjes, 1968 -- invalid
  Pseudmecynostomum pallidum (Beklemischev, 1915) -- invalid
  Pseudmecynostomum papillosum Faubel, 1974 -- invalid
  Pseudmecynostomum pellucidum Ehlers and Dörjes, 1979 -- valid
  Pseudmecynostomum pelophilum Dörjes, 1968 -- valid
  Pseudmecynostomum phoca Hooge and Tyler, 2003 -- valid
  Pseudmecynostomum phocum Hooge, 2001 -- invalid
  Pseudmecynostomum sanguineum (Beklemischev, 1915) -- invalid
  Pseudmecynostomum tardum Ehlers and Dörjes, 1979 -- invalid
  Pseudmecynostomum westbladi Dörjes, 1968 -- invalid
  Pseudobiceros Faubel, 1984 -- valid
  Pseudobiceros apricus Newman and Cannon, 1994 -- valid
  Pseudobiceros bajae (Hyman, 1953) -- invalid
  Pseudobiceros bedfordi (Laidlaw, 1903) -- valid
  Pseudobiceros brogani Newman and Cannon, 1997 -- valid
  Pseudobiceros caribbensis Bolaños, Quiroga and Litvaitis, 2007 -- valid
  Pseudobiceros cincereus (Palombi, 1931) -- invalid
  Pseudobiceros cinereus (Palombi, 1931) -- valid
  Pseudobiceros damawan Newman and Cannon, 1994 -- valid
  Pseudobiceros dendriticus (Prudhoe, 1989) -- valid
  Pseudobiceros evelinae (Marcus, 1950) -- valid
  Pseudobiceros ferrugineus (Hyman, 1959) -- valid
  Pseudobiceros flavocanthus Newman and Cannon, 1994 -- valid
  Pseudobiceros flavolineatus (Prudhoe, 1989) -- valid
  Pseudobiceros flavomarginatus (Laidlaw, 1902) -- valid
  Pseudobiceros flowersi Newman and Cannon, 1997 -- valid
  Pseudobiceros fulgor Newman and Cannon, 1994 -- valid
  Pseudobiceros fulvogriseus (Hyman, 1959) -- valid
  Pseudobiceros gardineri (Laidlaw, 1902) -- valid
  Pseudobiceros gardinieri (Laidlaw, 1902) -- invalid
  Pseudobiceros gloriosus Newman and Cannon, 1994 -- valid
  Pseudobiceros gratus (Kato, 1937) -- valid
  Pseudobiceros hancockanus (Collingwood, 1876) -- valid
  Pseudobiceros hymanae Newman and Cannon, 1997 -- valid
  Pseudobiceros izuensis (Kato, 1944) -- valid
  Pseudobiceros kryptos Newman and Cannon, 1997 -- valid
  Pseudobiceros micronesianus (Hyman, 1955) -- valid
  Pseudobiceros mikros Newman and Cannon, 1997 -- valid
  Pseudobiceros miniatus (Schmarda, 1859) -- valid
  Pseudobiceros murinus Newman and Cannon, 1997 -- valid
  Pseudobiceros nigromarginatus (Yeri and Kaburaki, 1918) -- valid
  Pseudobiceros pardalis (Verrill, 1900) -- valid
  Pseudobiceros periculosus Newman and Cannon, 1994 -- valid
  Pseudobiceros philippinensis (Kaburaki, 1923) -- valid
  Pseudobiceros rubrocinctus (Schmarda, 1859) -- valid
  Pseudobiceros schmardae Faubel, 1984 -- valid
  Pseudobiceros sharroni Newman and Cannon, 1997 -- valid
  Pseudobiceros splendidus (Stummer-Traunfels, 1933) -- valid
  Pseudobiceros stellae Newman and Cannon, 1994 -- valid
  Pseudobiceros strigosus (Marcus, 1950) -- invalid
  Pseudobiceros undulatus (Kelaart, 1858) -- valid
  Pseudobiceros uniarborensis Newman and Cannon, 1994 -- invalid
  Pseudobiceros viridis (Kelaart, 1858) -- valid
  Pseudobiceros wirtzi Bahia and Schroedl, 2016 -- valid
  Pseudobockia Kolasa, 1981 -- valid
  Pseudobockia limicola Kolasa, 1981 -- valid
  Pseudocerops Bock, 1913 -- invalid
  Pseudoceros Lang, 1884 -- valid
  Pseudoceros (Acanthozoon) Collingwood, 1876 -- invalid
  Pseudoceros affinis (Collingwood, 1876) -- valid
  Pseudoceros albicornis (Stimpson, 1857) -- valid
  Pseudoceros albomarginatus Hyman, 1959 -- valid
  Pseudoceros armatus (Kelaart, 1858) -- invalid
  Pseudoceros asamusiensis Kato, 1939 -- valid
  Pseudoceros astrorum Bulnes and Torres, 2014 -- valid
  Pseudoceros ater Hyman, 1959 -- valid
  Pseudoceros atraviridis (Collingwood, 1876) -- valid
  Pseudoceros atropurpureus Kato, 1934 -- valid
  Pseudoceros aureolineata Verrill, 1901 -- invalid
  Pseudoceros aureolineatus Verrill, 1901 -- invalid
  Pseudoceros bajae Hyman, 1953 -- invalid
  Pseudoceros bedfordii Laidlaw, 1903 -- invalid
  Pseudoceros bicolor Verrill, 1901 -- valid
  Pseudoceros bicolor bicolor Verrill, 1901 -- valid
  Pseudoceros bicolor marcusorum Litvaitis, Bolaños and Quiroga, 2010 -- valid
  Pseudoceros bifasciatus Prudhoe, 1989 -- valid
  Pseudoceros bifurcus Prudhoe, 1989 -- invalid
  Pseudoceros bimarginatum Meixner, 1907 -- invalid
  Pseudoceros bimarginatus Meixner, 1907 -- valid
  Pseudoceros bolool Newman and Cannon, 1994 -- valid
  Pseudoceros buskii (Collingwood, 1876) -- valid
  Pseudoceros caeruleocinctus Hyman, 1959 -- valid
  Pseudoceros caeruleopunctatus Palombi, 1928 -- valid
  Pseudoceros canadensis Hyman, 1953 -- valid
  Pseudoceros cardinalis Haswell, 1907 -- valid
  Pseudoceros cardiosorus (Schmarda, 1859) -- valid
  Pseudoceros cerebralis (Kelaart, 1858) -- valid
  Pseudoceros chloreus Marcus, 1949 -- valid
  Pseudoceros cinereus Palombi, 1931 -- invalid
  Pseudoceros clavicornis (Schmarda, 1859) -- valid
  Pseudoceros coccineus (Stimpson, 1857) -- valid
  Pseudoceros colemani Prudhoe, 1977 -- valid
  Pseudoceros collingwoodii Laidlaw, 1903 -- valid
  Pseudoceros concinnus (Collingwood, 1876) -- valid
  Pseudoceros confusus Newman and Cannon, 1995 -- valid
  Pseudoceros contrarius Newman and Cannon, 1995 -- valid
  Pseudoceros corallophilus Hyman, 1954 -- invalid
  Pseudoceros crozieri Hyman, 1939 -- invalid
  Pseudoceros cruentus Newman and Cannon, 1998 -- valid
  Pseudoceros depiliktabub Newman and Cannon, 1994 -- valid
  Pseudoceros devisii Woodworth, 1898 -- valid
  Pseudoceros dimidiatus Graff, 1893 -- valid
  Pseudoceros dulcis (Kelaart, 1858) -- valid
  Pseudoceros evelinae Marcus, 1950 -- invalid
  Pseudoceros exoptatus Kato, 1938 -- valid
  Pseudoceros felis Newman and Cannon, 1994 -- valid
  Pseudoceros ferrugineus Hyman, 1959 -- invalid
  Pseudoceros flavomaculatus (Graff, 1893) -- valid
  Pseudoceros flavomarginatus Laidlaw, 1902 -- invalid
  Pseudoceros flavomarginatus luteomarginatus Yeri and Kaburaki, 1918 -- invalid
  Pseudoceros fulminatus (Stimpson, 1855) -- valid
  Pseudoceros fulvogriseus Hyman, 1959 -- invalid
  Pseudoceros fuscogriseus Hyman, 1959 -- valid
  Pseudoceros fuscopunctatus Prudhoe, 1977 -- valid
  Pseudoceros fuscus (Kelaart, 1858) -- valid
  Pseudoceros galatheensis Dixit, Raghunathan and Chandra, 2017 -- valid
  Pseudoceros gamblei Laidlaw, 1902 -- valid
  Pseudoceros gardineri Laidlaw, 1902 -- invalid
  Pseudoceros gardinieri Laidlaw, 1902 -- invalid
  Pseudoceros glaucus Prudhoe, 1989 -- valid
  Pseudoceros goslineri Newman and Cannon, 1994 -- valid
  Pseudoceros gratus Kato, 1937 -- invalid
  Pseudoceros gravieri Meixner, 1907 -- valid
  Pseudoceros griseus Hyman, 1959 -- valid
  Pseudoceros guttatomarginatus (Stimpson, 1855) -- valid
  Pseudoceros habroptilus Hyman, 1959 -- valid
  Pseudoceros haddoni (Laidlaw, 1903) -- valid
  Pseudoceros hancockanus (Collingwood, 1876) -- invalid
  Pseudoceros harrisi Bolaños, Quiroga and Litvaitis, 2007 -- valid
  Pseudoceros heronensis Newman and Cannon, 1994 -- valid
  Pseudoceros hispidus Du Bois-Reymond Marcus, 1955 -- invalid
  Pseudoceros imitatus Newman and Cannon, 1994 -- valid
  Pseudoceros imperatus Newman and Cannon, 1998 -- valid
  Pseudoceros indicus Newman and Schupp, 2002 -- valid
  Pseudoceros intermittus Newman and Cannon, 1995 -- valid
  Pseudoceros interruptus (Stimpson, 1855) -- valid
  Pseudoceros irretitus Newman and Cannon, 1998 -- valid
  Pseudoceros izuensis Kato, 1944 -- invalid
  Pseudoceros japonicus (Stimpson, 1857) -- valid
  Pseudoceros jebborum Newman and Cannon, 1994 -- valid
  Pseudoceros josei Newman and Cannon, 1998 -- valid
  Pseudoceros juani Bahia et al., 2014 -- valid
  Pseudoceros kelaarti (Collingwood, 1876) -- valid
  Pseudoceros kelaartii (Collingwood, 1876) -- invalid
  Pseudoceros kentii Graff, 1893 -- valid
  Pseudoceros kylie Newman and Cannon, 1998 -- valid
  Pseudoceros lacteus (Collingwood, 1876) -- valid
  Pseudoceros lactolimbus Newman and Cannon, 1998 -- valid
  Pseudoceros laingensis Newman and Cannon, 1998 -- valid
  Pseudoceros langamaakensis Faubel, 1983 -- valid
  Pseudoceros langemaakensis Faubel, 1983 -- invalid
  Pseudoceros laticlavus Newman and Cannon, 1994 -- valid
  Pseudoceros latissimus (Schmarda, 1859) -- valid
  Pseudoceros lepida (Heath and McGregor, 1912) -- invalid
  Pseudoceros leptostictus Bock, 1913 -- valid
  Pseudoceros limbatus (Leuckart, 1828) -- valid
  Pseudoceros limbatus Haswell, 1907 -- invalid
  Pseudoceros lindae Newman and Cannon, 1994 -- valid
  Pseudoceros liparus Marcus, 1950 -- valid
  Pseudoceros litoralis Bock, 1913 -- valid
  Pseudoceros lividus Prudhoe, 1982 -- valid
  Pseudoceros luteomarginatus Yeri and Kaburaki, 1918 -- invalid
  Pseudoceros luteus (Plehn, 1897) -- valid
  Pseudoceros maculatus (Pease, 1860) -- valid
  Pseudoceros maculosus Pearse, 1938 -- invalid
  Pseudoceros malayensis (Collingwood, 1876) -- invalid
  Pseudoceros marmoratus Plehn, 1898 -- invalid
  Pseudoceros maximus Lang, 1884 -- valid
  Pseudoceros memoralis Kato, 1938 -- valid
  Pseudoceros mexicanus Hyman, 1953 -- valid
  Pseudoceros microceraeus (Schmarda, 1859) -- valid
  Pseudoceros micronesianus Hyman, 1955 -- invalid
  Pseudoceros micropapillosus Kato, 1934 -- valid
  Pseudoceros miniatus (Schmarda, 1859) -- invalid
  Pseudoceros monostichos Newman and Cannon, 1994 -- valid
  Pseudoceros montereyensis Hyman, 1953 -- valid
  Pseudoceros mopsus Marcus, 1952 -- invalid
  Pseudoceros mossambicus Prudhoe, 1989 -- valid
  Pseudoceros muelleri (Delle Chiaje, 1829) -- valid
  Pseudoceros mulleri (Delle Chiaje, 1829) -- invalid
  Pseudoceros niger (Stimpson, 1857) -- valid
  Pseudoceros nigrocinctus (Schmarda, 1859) -- valid
  Pseudoceros nigromarginatus Yeri and Kaburaki, 1918 -- invalid
  Pseudoceros nigropunctatus Dixit, Raghunathan and Chandra, 2017 -- valid
  Pseudoceros nipponicus Kato, 1944 -- valid
  Pseudoceros ouini Newman and Cannon, 1994 -- valid
  Pseudoceros papilionis (Kelaart, 1858) -- invalid
  Pseudoceros paradoxus Bock, 1927 -- valid
  Pseudoceros paralaticlavus Newman and Cannon, 1994 -- valid
  Pseudoceros pardalis Verrill, 1900 -- invalid
  Pseudoceros periaurantius Newman and Cannon, 1994 -- valid
  Pseudoceros periphaeus Bock, 1913 -- valid
  Pseudoceros peripurpureus Newman and Cannon, 1994 -- valid
  Pseudoceros perviolaceus Hyman, 1959 -- valid
  Pseudoceros philippinensis Kaburaki, 1923 -- invalid
  Pseudoceros pius Kato, 1938 -- valid
  Pseudoceros pleurostictus Bock, 1913 -- valid
  Pseudoceros prudhoei Newman and Cannon, 1994 -- valid
  Pseudoceros punctatus Laidlaw, 1902 -- valid
  Pseudoceros purpureus (Kelaart, 1858) -- valid
  Pseudoceros rawlinsonae Bolaños, Quiroga and Litvaitis, 2007 -- valid
  Pseudoceros regalis Laidlaw, 1903 -- valid
  Pseudoceros regalus Laidlaw, 1903 -- invalid
  Pseudoceros reticulatus Yeri and Kaburaki, 1918 -- valid
  Pseudoceros rubellus Laidlaw, 1903 -- valid
  Pseudoceros rubrocinctus (Schmarda, 1859) -- invalid
  Pseudoceros rubronanus Newman and Cannon, 1998 -- valid
  Pseudoceros rubrotentaculatus Kaburaki, 1923 -- valid
  Pseudoceros sagamianus Kato, 1937 -- valid
  Pseudoceros sapphirinus Newman and Cannon, 1994 -- invalid
  Pseudoceros scintillatus Newman and Cannon, 1994 -- valid
  Pseudoceros scriptus Newman and Cannon, 1998 -- valid
  Pseudoceros splendidus Stummer-Traunfels, 1933 -- invalid
  Pseudoceros stimpsoni Newman and Cannon, 1998 -- valid
  Pseudoceros striatus (Kelaart, 1858) -- valid
  Pseudoceros striatus (Schmarda, 1859) -- invalid
  Pseudoceros strigosus Marcus, 1950 -- invalid
  Pseudoceros superbus Lang, 1884 -- invalid
  Pseudoceros superbus (Schmarda, 1859) -- invalid
  Pseudoceros susakiensis Kato, 1934 -- invalid
  Pseudoceros susanae Newman and Anderson, 1997 -- valid
  Pseudoceros texanus Hyman, 1955 -- valid
  Pseudoceros tigrinus Laidlaw, 1902 -- valid
  Pseudoceros tomiokaensis Kato, 1938 -- valid
  Pseudoceros tristriatus Hyman, 1959 -- valid
  Pseudoceros undulata (Kelaart, 1858) -- invalid
  Pseudoceros undulatus (Kelaart, 1858) -- invalid
  Pseudoceros velutinus (Blanchard, 1847) -- valid
  Pseudoceros velutinus violaceous (Schmarda, 1859) -- invalid
  Pseudoceros velutinus violaceus (Schmarda, 1859) -- invalid
  Pseudoceros verecundus Newman and Cannon, 1994 -- valid
  Pseudoceros vinosus Meixner, 1907 -- valid
  Pseudoceros violaceous (Schmarda, 1859) -- invalid
  Pseudoceros violaceus (Kelaart, 1858) -- invalid
  Pseudoceros violaceus (Schmarda, 1859) -- invalid
  Pseudoceros virescens Hyman, 1955 -- invalid
  Pseudoceros viridis (Kelaart, 1858) -- invalid
  Pseudoceros yeesoensis Kato, 1937 -- invalid
  Pseudoceros yessoensis Kato, 1937 -- valid
  Pseudoceros zebra (Leuckart, 1828) -- valid
  Pseudoceros zeylanicus (Kelaart, 1858) -- valid
  Pseudocerotidae Lang, 1884 -- valid
  Pseudocerotoidea Faubel, 1984 -- valid
  Pseudoconvoluta Beklemischev, 1929 -- valid
  Pseudoconvoluta aurantiaca Beklemischev, 1929 -- valid
  Pseudoconvoluta flava Beklemischev, 1964 -- invalid
  Pseudodalyellia Van Steenkiste, Gobert, Davison, Kolasa and Artois, 2011 -- valid
  Pseudodalyellia alabamensis Van Steenkiste, Gobert, Davison, Kolasa and Artois, 2011 -- valid
  Pseudodiscocelis Bulnes, 2010 -- valid
  Pseudodiscocelis aegeanensis Bulnes, 2010 -- valid
  Pseudogeoplana Ogren and Kawakatsu, 1990 -- valid
  Pseudogeoplana albopunctata (Graff, 1899) -- valid
  Pseudogeoplana andicola (Schmarda, 1859) -- valid
  Pseudogeoplana arpi (Schirch, 1929) -- valid
  Pseudogeoplana atropurpurea (Riester, 1938) -- valid
  Pseudogeoplana bilinearis (Darwin, 1844) -- valid
  Pseudogeoplana bilineata (Fuhrmann, 1914) -- valid
  Pseudogeoplana blanchardi (Graff, 1899) -- valid
  Pseudogeoplana blaseri (Schirch, 1929) -- valid
  Pseudogeoplana bohlsi (Graff, 1899) -- valid
  Pseudogeoplana bonita (Schirch, 1929) -- valid
  Pseudogeoplana brasiliensis (Blainville, 1826) -- valid
  Pseudogeoplana bresslaui (Schirch, 1929) -- valid
  Pseudogeoplana brittlebanki (Graff, 1897) -- valid
  Pseudogeoplana burri (Riester, 1938) -- valid
  Pseudogeoplana cardosi (Schirch, 1929) -- valid
  Pseudogeoplana collini (Graff, 1899) -- valid
  Pseudogeoplana columbiana (Fuhrmann, 1914) -- valid
  Pseudogeoplana distincta (Graff, 1899) -- valid
  Pseudogeoplana doederleini (Schirch, 1929) -- valid
  Pseudogeoplana ehlersi (Graff, 1899) -- valid
  Pseudogeoplana elegans (Darwin, 1844) -- valid
  Pseudogeoplana elongata (Darwin, 1844) -- valid
  Pseudogeoplana eugeniae (Graff, 1897) -- valid
  Pseudogeoplana flava (Moseley, 1877) -- valid
  Pseudogeoplana goeldii (Graff, 1899) -- valid
  Pseudogeoplana gollmeri (Graff, 1899) -- valid
  Pseudogeoplana gonzalezi (Fuhrmann, 1914) -- valid
  Pseudogeoplana halbani (Graff, 1899) -- valid
  Pseudogeoplana lumbricoides (Schirch, 1929) -- valid
  Pseudogeoplana maculata (Darwin, 1844) -- valid
  Pseudogeoplana maximiliani (Schultze and F. Müller, 1857) -- valid
  Pseudogeoplana meyerhansi (Fuhrmann, 1914) -- valid
  Pseudogeoplana nephelis (Schultze and F. Müller, 1857) -- valid
  Pseudogeoplana nigrocephala (Fuhrmann, 1914) -- valid
  Pseudogeoplana nigrofusca (Darwin, 1844) -- valid
  Pseudogeoplana nobilis (Graff, 1899) -- valid
  Pseudogeoplana obscura (Schirch, 1929) -- valid
  Pseudogeoplana octolineata (Schirch, 1929) -- valid
  Pseudogeoplana oerstedi (Graff, 1899) -- valid
  Pseudogeoplana pallida (Darwin, 1844) -- valid
  Pseudogeoplana panamensis (Hyman, 1941) -- valid
  Pseudogeoplana pardalina (Graff, 1899) -- valid
  Pseudogeoplana pavonina (Riester, 1938) -- valid
  Pseudogeoplana perspicillata (Graff, 1899) -- valid
  Pseudogeoplana pulla (Darwin, 1844) -- valid
  Pseudogeoplana reticulata (Graff, 1899) -- valid
  Pseudogeoplana riedeli (Schirch, 1929) -- valid
  Pseudogeoplana rosenbergi (Meixner, 1906) -- valid
  Pseudogeoplana rostrata (Graff, 1899) -- valid
  Pseudogeoplana sagittata (Graff, 1899) -- valid
  Pseudogeoplana schirchi Ogren and Kawakatsu, 1990 -- valid
  Pseudogeoplana semilineata (Darwin, 1844) -- valid
  Pseudogeoplana stolli (Graff, 1899) -- valid
  Pseudogeoplana taenioides (Graff, 1899) -- valid
  Pseudogeoplana theresopolitana (Schirch, 1929) -- valid
  Pseudogeoplana tricolor (Riester, 1938) -- valid
  Pseudogeoplana tristriata (Schultze and F. Müller, 1857) -- valid
  Pseudogeoplana ucayalensis (Hyman, 1955) -- valid
  Pseudogeoplana wetzeli (Schirch, 1929) -- valid
  Pseudograffilla Meixner, 1938 -- valid
  Pseudograffilla arenicola Meixner, 1938 -- valid
  Pseudograffilla hymanae Mack-Fira, 1974 -- valid
  Pseudograffillinae Meixner, 1938 -- valid
  Pseudogyratrix Meixner, 1938 -- invalid
  Pseudogyratrix helgolandicum Meixner, 1938 -- invalid
  Pseudohaplogonaria Dörjes, 1968 -- valid
  Pseudohaplogonaria caribbea Hooge and Tyler, 2008 -- invalid
  Pseudohaplogonaria cerasina Hooge and Smith, 2004 -- valid
  Pseudohaplogonaria macnaei (Du Bois-Reymond Marcus, 1957) -- invalid
  Pseudohaplogonaria minima Ehlers and Dörjes, 1979 -- valid
  Pseudohaplogonaria opisthandropora (Mamkaev, 1971) -- valid
  Pseudohaplogonaria rodmani Hooge and Tyler, 2007 -- valid
  Pseudohaplogonaria stylifera (Westblad, 1946) -- invalid
  Pseudohaplogonaria sutcliffei (Hanson, 1961) -- valid
  Pseudohaplogonaria vacua Dörjes, 1968 -- valid
  Pseudohaplogonaria viridipunctata (Westblad, 1946) -- valid
  Pseudokuma Dörjes, 1968 -- valid
  Pseudokuma orphinum (Marcus, 1950) -- valid
  Pseudomecynostomum Dörjes, 1968 -- invalid
  Pseudominona Karling, 1978 -- valid
  Pseudominona dactylifera Karling, 1978 -- valid
  Pseudomonocelis Meixner, 1943 -- valid
  Pseudomonocelis agilis (Schultze, 1851) -- valid
  Pseudomonocelis caribbea Curini-Galletti and Casu, 2005 -- valid
  Pseudomonocelis cavernicola Schockaert and Martens, 1987 -- valid
  Pseudomonocelis cetinae Meixner, 1943 -- valid
  Pseudomonocelis hoplites Curini-Galletti, 1997 -- valid
  Pseudomonocelis occidentalis Curini-Galletti, Casu and Lai, 2011 -- valid
  Pseudomonocelis ophiocephala (Schmidt, 1861) -- valid
  Pseudomonocelis orientalis Curini-Galletti, Casu and Lai, 2011 -- valid
  Pseudomonocelis pardii Schockaert and Martens, 1987 -- valid
  Pseudomonocelis paulista Curini-Galletti, 2014 -- valid
  Pseudomonocelis paupercula Casu, Cossu, Sanna, Lai, Scarpa and Curini-Galletti, 2011 -- valid
  Pseudomonocelis schockaerti Curini-Galletti and Cannon, 1995 -- valid
  Pseudophaenocora Gilbert, 1938 -- valid
  Pseudophaenocora sulfophila Gilbert, 1938 -- valid
  Pseudoplanocera Bulnes, 2010 -- valid
  Pseudoplanocera izmirensis Bulnes, 2010 -- valid
  Pseudopolycystis Meixner, 1938 -- invalid
  Pseudopolycystis inermis Meixner, 1929 -- invalid
  Pseudoposthia Westblad, 1946 -- valid
  Pseudoposthia macrogonopora Westblad, 1946 -- valid
  Pseudorhynchus Graff, 1905 -- invalid
  Pseudorhynchus bifidus (McIntosh, 1874) -- invalid
  Pseudorhynchus tauricus (Uljanin, 1870) -- invalid
  Pseudorthoplana Ax, Weidemann and Ehlers, 1978 -- valid
  Pseudorthoplana foliacea (Meixner, 1938) -- valid
  Pseudoschizorhynchoides Schilke, 1970 -- valid
  Pseudoschizorhynchoides karlingi (Martens and Schockaert, 1981) -- valid
  Pseudoschizorhynchoides oculatus Evdonin, 1977 -- valid
  Pseudoschizorhynchoides ruber Schilke, 1970 -- valid
  Pseudostomidae Graff, 1904 -- valid
  Pseudostomum Schmidt, 1848 -- valid
  Pseudostomum arenarium Meixner, 1938 -- valid
  Pseudostomum caecum (Graff, 1882) -- invalid
  Pseudostomum californicum Karling, 1962 -- valid
  Pseudostomum coecum (Graff, 1882) -- valid
  Pseudostomum dubium Graff, 1911 -- invalid
  Pseudostomum elegans (Pereyaslawzewa, 1892) -- invalid
  Pseudostomum faeroense Schmidt, 1848 -- invalid
  Pseudostomum gracilis Westblad, 1955 -- valid
  Pseudostomum inerme (Hallez, 1879) -- invalid
  Pseudostomum klostermanni (Graff, 1874) -- valid
  Pseudostomum ponticum Uljanin, 1870 -- invalid
  Pseudostomum quadrioculatum (Leuckart, 1847) -- valid
  Pseudostylochidae Faubel, 1983 -- valid
  Pseudostylochus Yeri and Kaburaki, 1918 -- valid
  Pseudostylochus aino Kato, 1937 -- valid
  Pseudostylochus bellus Hyman, 1959 -- invalid
  Pseudostylochus burchami (Heath and McGregor, 1912) -- invalid
  Pseudostylochus edurus Kato, 1938 -- valid
  Pseudostylochus elongatus Kato, 1937 -- invalid
  Pseudostylochus fulvus Yeri and Kaburaki, 1918 -- invalid
  Pseudostylochus fuscoviridus Kato, 1934 -- valid
  Pseudostylochus intermedius Kato, 1939 -- valid
  Pseudostylochus longipenis Kato, 1937 -- invalid
  Pseudostylochus mactanensis Faubel, 1983 -- valid
  Pseudostylochus maculatus Kato, 1938 -- valid
  Pseudostylochus meridialis Kato, 1938 -- invalid
  Pseudostylochus nationalis Kato, 1939 -- valid
  Pseudostylochus notoensis Kato, 1944 -- invalid
  Pseudostylochus obscurus (Stimpson, 1857) -- valid
  Pseudostylochus okudai Kato, 1937 -- valid
  Pseudostylochus ostreophagus Hyman, 1955 -- invalid
  Pseudostylochus sadoensis Kato, 1944 -- valid
  Pseudostylochus stimpsoni Kato, 1937 -- invalid
  Pseudostylochus takeshitai Yeri and Kaburaki, 1918 -- invalid
  Pseudosyrtis Ax, 1956 -- valid
  Pseudosyrtis calcaris Sopott-Ehlers, 1976 -- valid
  Pseudosyrtis cebimari Curini-Galletti, 2014 -- valid
  Pseudosyrtis fluviatilis (Gieysztor, 1938) -- valid
  Pseudosyrtis neiswestnovae Riemann, 1965 -- valid
  Pseudosyrtis subterranea (Ax, 1951) -- valid
  Pseudovannuccia Faubel and Rohde, 1998 -- valid
  Pseudovannuccia hirutai (Tajika, 1981) -- valid
  Psittacorhynchus Hartog, 1968 -- valid
  Psittacorhynchus verweyi Hartog, 1968 -- valid
  Pterastericola Beklemischev, 1916 -- valid
  Pterastericola asamushii Jondelius, 1992 -- valid
  Pterastericola astropectinis (Bashiruddin and Karling, 1970) -- valid
  Pterastericola australis Cannon, 1986 -- valid
  Pterastericola bergensis Jondelius, 1992 -- valid
  Pterastericola fedotovi Beklemischev, 1916 -- valid
  Pterastericola pellucida Jondelius, 1989 -- valid
  Pterastericola psilastericola (Jespersen and Luetzen, 1972) -- valid
  Pterastericola ramosa Cannon, 1986 -- valid
  Pterastericola rottnestensis Jondelius, 1996 -- valid
  Pterastericola sinensis Jondelius, 1992 -- valid
  Pterastericola sprenti Cannon, 1986 -- valid
  Pterastericola vivipara Cannon, 1978 -- valid
  Pterastericolidae Meixner, 1925 -- valid
  Pterognathus Evdonin, 1977 -- valid
  Pterognathus longostilo (Schilke, 1970) -- valid
  Ptyalorhynchus Ax, 1951 -- valid
  Ptyalorhynchus coecus Ax, 1951 -- valid
  Ptyalorhynchus piger Brunet, 1973 -- valid
  Ptychopera Hartog, 1964 -- valid
  Ptychopera alaskana Ax and Armonies, 1990 -- valid
  Ptychopera avicularis Karling, 1974 -- valid
  Ptychopera ehlersi Ax, 1971 -- valid
  Ptychopera hartogi Ax, 1971 -- valid
  Ptychopera japonica Ax, 2008 -- valid
  Ptychopera plebeia (Beklemischev, 1927) -- valid
  Ptychopera purasjokii Ax, 1971 -- valid
  Ptychopera scutulifera Ehlers and Ax, 1974 -- valid
  Ptychopera spinifera Hartog, 1966 -- valid
  Ptychopera subterranea Ax, 1971 -- valid
  Ptychopera tuberculata (Graff, 1882) -- valid
  Ptychopera westbladi (Luther, 1943) -- valid
  Ptychopera zostericola Ax, 1971 -- valid
  Pucelis Marcus, 1947 -- invalid
  Pucelis celeris (Freeman, 1933) -- invalid
  Pucelis evelinae Marcus, 1947 -- invalid
  Pucelis litoricola (Heath and McGregor, 1912) -- invalid
  Pucelis mexicana (Hyman, 1953) -- invalid
  Pucelis natans (Freeman, 1933) -- invalid
  Pucelis sanguinea (Freeman, 1933) -- invalid
  Pucelis sanjuania (Freeman, 1933) -- invalid
  Puiteca Du Bois-Reymond Marcus, 1955 -- valid
  Puiteca camica Du Bois-Reymond Marcus, 1955 -- valid
  Puiteca rigida Sluys and Ball, 1989 -- valid
  Pulchriplana Palombi, 1938 -- valid
  Pulchriplana insignis Palombi, 1938 -- valid
  Puzostoma Marcus, 1950 -- valid
  Puzostoma evelinae Marcus, 1950 -- valid
  Pygmorhynchus Artois and Schockaert, 1999 -- valid
  Pygmorhynchus pygmaeus Artois and Schockaert, 1999 -- valid
  Raphidophallus Kozloff, 1965 -- valid
  Raphidophallus actuosus Kozloff, 1965 -- valid
  Rectocephala Hyman, 1953 -- invalid
  Rectocephala baicalensis (Sabussow, 1903) -- invalid
  Rectocephala exotica Hyman, 1953 -- invalid
  Rectocephala grubiiformis (Sabussow, 1929) -- invalid
  Rectocephala kamatschatica (Sabussow, 1929) -- invalid
  Rectocephala mediobuccalis (Sabussow, 1929) -- invalid
  Rectocephala schneideri (Komarek, 1930) -- invalid
  Reisingeria Westblad, 1955 -- valid
  Reisingeria hexoculatus Westblad, 1955 -- valid
  Reomkago Winsor, 1991 -- valid
  Reomkago flynni (Dendy, 1915) -- valid
  Reomkago quadrangulatus (Dendy, 1891) -- valid
  Reomkago ventropunctatus (Dendy, 1892) -- valid
  Reomkago wellingtoni (Dendy, 1892) -- valid
  Retronectes Sterrer and Rieger, 1974 -- valid
  Retronectes atypica Doe and Rieger, 1977 -- valid
  Retronectes clio Sterrer and Rieger, 1974 -- valid
  Retronectes euterpe Sterrer and Rieger, 1974 -- valid
  Retronectes melpomene Sterrer and Rieger, 1974 -- valid
  Retronectes sterreri Faubel, 1976 -- valid
  Retronectes terpsichore Sterrer and Rieger, 1974 -- valid
  Retronectes thalia Sterrer and Rieger, 1974 -- valid
  Retronectidae Sterrer and Rieger, 1974 -- valid
  Reuterella Timoshkin, 2004 -- invalid
  Revertospermata Kornakova and Joffe, 1999 -- invalid
  Reynoldsonia Ball, 1974 -- valid
  Reynoldsonia reynoldsonia Ball, 1974 -- valid
  Rhabditophora Ehlers, 1985 -- valid
  Rhabdocoela Ehrenberg, 1831 -- invalid
  Rhabdostoma Girard, 1893 -- invalid
  Rhabdostoma planum (Silliman, 1885) -- invalid
  Rhimacephalus Sabussow, 1901 -- invalid
  Rhinepera Meixner, 1928 -- invalid
  Rhinepera divisa Schilke, 1970 -- invalid
  Rhinepera marcusi Karling, 1956 -- invalid
  Rhinepera remanei Meixner, 1928 -- invalid
  Rhinepera targa Marcus, 1952 -- invalid
  Rhinepera vaginalis Meixner, 1929 -- invalid
  Rhinolasius Marcus, 1951 -- valid
  Rhinolasius dillonicus Karling, 1980 -- valid
  Rhinolasius sartus Marcus, 1951 -- valid
  Rhodax Marcus, 1946 -- valid
  Rhodax evelinae Marcus, 1946 -- valid
  Rhomboplanilla Schwank, 1980 -- valid
  Rhomboplanilla bryophila Schwank, 1980 -- valid
  Rhynchodeminae Graff, 1896 -- valid
  Rhynchodemini Graff, 1896 -- valid
  Rhynchodemus Leidy, 1851 -- valid
  Rhynchodemus aberanus (Mell, 1904) -- invalid
  Rhynchodemus albicollis Graff, 1899 -- invalid
  Rhynchodemus amboinensis Graff, 1899 -- invalid
  Rhynchodemus americanus Hyman, 1943 -- valid
  Rhynchodemus anamallensis de Beauchamp, 1930 -- invalid
  Rhynchodemus angustus (Hyman, 1941) -- valid
  Rhynchodemus aripensis Prudhoe, 1949 -- valid
  Rhynchodemus assimilis Geba, 1909 -- invalid
  Rhynchodemus atrocyaneus (Walton, 1912) -- invalid
  Rhynchodemus atropurpureus (Graff, 1899) -- invalid
  Rhynchodemus attemsi Bendl, 1909 -- invalid
  Rhynchodemus belli Graff, 1899 -- invalid
  Rhynchodemus bilineatus (Metschnikoff, 1865) -- invalid
  Rhynchodemus bistriatus Grube, 1868 -- invalid
  Rhynchodemus blainvillei Graff, 1899 -- valid
  Rhynchodemus boehmigi Graff, 1899 -- invalid
  Rhynchodemus borelli Graff, 1894 -- invalid
  Rhynchodemus britannicus Percival, 1925 -- invalid
  Rhynchodemus brittanicus Percival, 1925 -- invalid
  Rhynchodemus bromelicola de Beauchamp, 1912 -- valid
  Rhynchodemus cameliae Fuhrmann, 1912 -- invalid
  Rhynchodemus carli Fuhrmann, 1914 -- invalid
  Rhynchodemus chuni Graff, 1899 -- invalid
  Rhynchodemus costaricensis de Beauchamp, 1913 -- valid
  Rhynchodemus coxii Fletcher and Hamilton, 1888 -- invalid
  Rhynchodemus cultratus Graff, 1898 -- invalid
  Rhynchodemus decenni (Battalgazi, 1945) -- invalid
  Rhynchodemus demani Graff, 1899 -- invalid
  Rhynchodemus diorchis Fuhrmann, 1914 -- invalid
  Rhynchodemus dubius Spencer, 1892 -- invalid
  Rhynchodemus excavatus Graff, 1899 -- invalid
  Rhynchodemus fasciatus Spencer, 1892 -- invalid
  Rhynchodemus figdori Graff, 1899 -- invalid
  Rhynchodemus flavus Moseley, 1877 -- valid
  Rhynchodemus fletcheri Spencer, 1892 -- invalid
  Rhynchodemus forrestianus Schröder, 1924 -- invalid
  Rhynchodemus fuscus Moseley, 1877 -- valid
  Rhynchodemus graetzi Du Bois-Reymond Marcus, 1953 -- valid
  Rhynchodemus grandis Spencer, 1892 -- invalid
  Rhynchodemus gravelyi de Beauchamp, 1930 -- invalid
  Rhynchodemus guttatus Fletcher and Hamilton, 1888 -- invalid
  Rhynchodemus hallezi Graff, 1899 -- invalid
  Rhynchodemus hectori Graff, 1897 -- valid
  Rhynchodemus hectori inopinata (de Beauchamp, 1930) -- invalid
  Rhynchodemus hectori marfa Marcus, 1953 -- invalid
  Rhynchodemus henrici (Bendl, 1908) -- invalid
  Rhynchodemus hirudineus de Beauchamp, 1930 -- invalid
  Rhynchodemus hovassei de Beauchamp, 1934 -- invalid
  Rhynchodemus howesi Scharff, 1900 -- invalid
  Rhynchodemus humicola (Vejdovsky, 1889) -- invalid
  Rhynchodemus ijimai Kaburaki, 1922 -- valid
  Rhynchodemus inopinatus (de Beauchamp, 1930) -- valid
  Rhynchodemus kukkal de Beauchamp, 1930 -- invalid
  Rhynchodemus laterolineatus Spencer, 1892 -- invalid
  Rhynchodemus lindsaysianus Schröder, 1924 -- invalid
  Rhynchodemus lineolatus (Graff, 1899) -- invalid
  Rhynchodemus lubbocki Graff, 1899 -- invalid
  Rhynchodemus maculatus Fuhrmann, 1914 -- invalid
  Rhynchodemus marfa Marcus, 1953 -- valid
  Rhynchodemus mediolineatus Spencer, 1892 -- invalid
  Rhynchodemus megalophthalmus Loman, 1890 -- invalid
  Rhynchodemus michaelsoni Graff, 1899 -- invalid
  Rhynchodemus misus Du Bois-Reymond Marcus, 1965 -- valid
  Rhynchodemus mitchellianus Schröder, 1924 -- invalid
  Rhynchodemus monacensis Heinzel, 1929 -- invalid
  Rhynchodemus montoyae (Fuhrmann, 1912) -- invalid
  Rhynchodemus moseleyi Fletcher and Hamilton, 1888 -- invalid
  Rhynchodemus musculosus de Beauchamp, 1930 -- invalid
  Rhynchodemus nematoides Loman, 1890 -- invalid
  Rhynchodemus nematopsis (de Beauchamp, 1930) -- valid
  Rhynchodemus neumanni (Mell, 1904) -- invalid
  Rhynchodemus nietneri Humbert and Claparède, 1862 -- invalid
  Rhynchodemus niger Fletcher and Hamilton, 1888 -- invalid
  Rhynchodemus nolli Graff, 1899 -- invalid
  Rhynchodemus oahuensis Hyman, 1939 -- valid
  Rhynchodemus obscurus Fletcher and Hamilton, 1888 -- invalid
  Rhynchodemus ochroleucus Graff, 1899 -- valid
  Rhynchodemus ochroleucus belli Graff, 1899 -- invalid
  Rhynchodemus ochroleucus ochroleucus Graff, 1899 -- valid
  Rhynchodemus ochroleucus varians Graff, 1899 -- valid
  Rhynchodemus palnisius de Beauchamp, 1930 -- valid
  Rhynchodemus pellucidus Graff, 1899 -- invalid
  Rhynchodemus peneckei Meixner, 1921 -- invalid
  Rhynchodemus piptus Marcus, 1952 -- valid
  Rhynchodemus purpureus Bendl, 1908 -- invalid
  Rhynchodemus putzei Graff, 1899 -- invalid
  Rhynchodemus pyrenaicus Graff, 1893 -- invalid
  Rhynchodemus quadristriatus Grube, 1868 -- invalid
  Rhynchodemus retractilis de Beauchamp, 1930 -- invalid
  Rhynchodemus richardi Bendl, 1909 -- invalid
  Rhynchodemus rubrocinctus Graff, 1899 -- invalid
  Rhynchodemus ruteocephala (Kaburaki, 1922) -- invalid
  Rhynchodemus samperi Fuhrmann, 1914 -- valid
  Rhynchodemus scharffi Graff, 1899 -- invalid
  Rhynchodemus schmardai Graff, 1899 -- valid
  Rhynchodemus schubarti Du Bois-Reymond Marcus, 1955 -- valid
  Rhynchodemus scius Du Bois-Reymond Marcus, 1955 -- valid
  Rhynchodemus scriptus Steel, 1897 -- invalid
  Rhynchodemus sholanus de Beauchamp, 1930 -- invalid
  Rhynchodemus sholanus uniductus de Beauchamp, 1930 -- invalid
  Rhynchodemus simulans Dendy, 1892 -- invalid
  Rhynchodemus stenopus Graff, 1894 -- invalid
  Rhynchodemus styriacus Freisling, 1935 -- invalid
  Rhynchodemus sumbawaeiensis (Haslauer-Gamisch, 1982) -- valid
  Rhynchodemus sylvaticus (Leidy, 1851) -- valid
  Rhynchodemus taunayi Diesing, 1862 -- invalid
  Rhynchodemus terrestris (O. F. Müller, 1773) -- invalid
  Rhynchodemus testaceus (Hutton, 1880) -- invalid
  Rhynchodemus thwaitesii Moseley, 1874 -- invalid
  Rhynchodemus torquatus de Beauchamp, 1930 -- invalid
  Rhynchodemus trilineatus Fletcher and Hamilton, 1888 -- invalid
  Rhynchodemus unilineatus Frieb, 1923 -- invalid
  Rhynchodemus varians Graff, 1899 -- invalid
  Rhynchodemus vejdovskyi Graff, 1899 -- valid
  Rhynchodemus victoriae Dendy, 1891 -- invalid
  Rhynchodemus victoriae steelii Dendy, 1895 -- invalid
  Rhynchodemus viridis (Jameson, 1907) -- invalid
  Rhynchodemus waburtonianus Schröder, 1924 -- invalid
  Rhynchokarlingia Timoshkin and Mamkaev, 2004 -- valid
  Rhynchokarlingia pomazkovae Timoshkin, 2004 -- valid
  Rhynchokarlingia tetrastylus (Timoshkin, 1986) -- valid
  Rhynchokarlingia zemskayae Timoshkin, 2004 -- valid
  Rhynchokarlingiidae Timoshkin, 2004 -- valid
  Rhynchomesostoma Luther, 1904 -- valid
  Rhynchomesostoma inaliensis Noreña-Janssen, 1995 -- valid
  Rhynchomesostoma lutheri Papi, 1963 -- valid
  Rhynchomesostoma rostratum (O. F. Müller, 1774) -- valid
  Rhynchomesostominae Bresslau, 1933 -- valid
  Rhynchoprobolus Schmarda, 1859 -- invalid
  Rhynchoprobolus erythrophthalmus Schmarda, 1859 -- invalid
  Rhynchoprobolus papillosus Schmarda, 1859 -- invalid
  Rhynchoprobolus tetrophthalmus Schmarda, 1859 -- invalid
  Rhynchoscolex Leidy, 1851 -- valid
  Rhynchoscolex diplolithicus Reisinger, 1924 -- valid
  Rhynchoscolex evelinae Marcus, 1945 -- valid
  Rhynchoscolex nanus Marcus, 1945 -- valid
  Rhynchoscolex papillosus (Schmarda, 1859) -- invalid
  Rhynchoscolex platypus Marcus, 1945 -- valid
  Rhynchoscolex pusillus Marcus, 1945 -- valid
  Rhynchoscolex remanei Rixen, 1961 -- valid
  Rhynchoscolex simplex Leidy, 1851 -- valid
  Rhynchoscolex simplex plotnikovi Beklemischev, 1923 -- valid
  Rhynchoscolex simplex simplex Leidy, 1851 -- valid
  Rhynchoscolex vejdovskyi Sekera, 1889 -- invalid
  Rhynchota Schmarda, 1859 -- invalid
  Rhynchota erythrophthalmus (Schmarda, 1859) -- invalid
  Rhynchota papillosus Schmarda, 1859 -- invalid
  Rhynchota tetrophthalmus (Schmarda, 1859) -- invalid
  Riedelella Timoshkin, 2004 -- valid
  Riedelella dmitrievae Timoshkin, 2004 -- valid
  Riedelella efremovae Timoshkin, 2004 -- valid
  Riedelella galazyi Timoshkin, 2004 -- valid
  Riedelella gibsoni Timoshkin, 2004 -- valid
  Riedelella greenwoodi Timoshkin, 2004 -- valid
  Riedelella heaneyi Timoshkin, 2004 -- valid
  Riedelella izhboldinae Timoshkin, 2004 -- valid
  Riedelella karabanovi Timoshkin, 2004 -- valid
  Riedelella kravtsovae Timoshkin, 2004 -- valid
  Riedelella krstanovskii Timoshkin, 2004 -- valid
  Riedelella kuznedelovi Timoshkin, 2004 -- valid
  Riedelella linevichae Timoshkin, 2004 -- valid
  Riedelella ninae (Timoshkin, 1986) -- valid
  Riedelella pectenuncinata Timoshkin, 2004 -- valid
  Riedelella provizae Timoshkin, 2004 -- valid
  Riedelella terentyevi Timoshkin, 2004 -- valid
  Riedelella tyleri Timoshkin, 2004 -- valid
  Rimacephalus Sabussow, 1901 -- valid
  Rimacephalus arecepta Porfirieva, 1969 -- valid
  Rimacephalus arecepta arecepta Porfirieva, 1969 -- valid
  Rimacephalus arecepta depigmentata Timoshkin and Porfirieva, 1989 -- valid
  Rimacephalus baikalensis Korotneff, 1910 -- valid
  Rimacephalus bistriatus Korotneff, 1901 -- valid
  Rimacephalus pulvinar (Grube, 1872) -- valid
  Rimacephalus punctatus Sabussow, 1903 -- valid
  Rimicola Böhmig, 1908 -- valid
  Rimicola glacialis Böhmig, 1908 -- valid
  Rjabuschinskya Sabussow, 1916 -- invalid
  Rjabuschinskya schmidti Sabussow, 1916 -- invalid
  Rodlige Danielssen and Koren, 1879 -- invalid
  Rogneda Uljanin, 1870 -- valid
  Rogneda acuta Brunet, 1979 -- valid
  Rogneda agilis Uljanin, 1870 -- invalid
  Rogneda amai (Schockaert, 1976) -- valid
  Rogneda anglica Karling, 1953 -- valid
  Rogneda capulata Karling, 1953 -- valid
  Rogneda cincta Brunet, 1969 -- valid
  Rogneda colpaerti Artois, 2008 -- valid
  Rogneda exilis Brunet, 1979 -- valid
  Rogneda falcata Brunet, 1965 -- valid
  Rogneda gallica Ax, 1956 -- valid
  Rogneda hibernica (Southern, 1936) -- valid
  Rogneda licyae Artois, 2008 -- valid
  Rogneda martensi Artois, 2008 -- valid
  Rogneda minuta Uljanin, 1870 -- valid
  Rogneda palula Brunet, 1969 -- valid
  Rogneda polyrhabdota Ax, 1959 -- valid
  Rogneda reticulata Brunet, 1969 -- valid
  Rogneda schaereri Artois, 2008 -- valid
  Rogneda steueri (Steinböck, 1933) -- valid
  Rogneda tripalmata (Beklemischev, 1927) -- valid
  Rogneda valckei Artois, 2008 -- valid
  Rogneda vangronsveldi Artois, 2008 -- valid
  Rogneda verveckeni Artois, 2008 -- valid
  Rogneda westbladi Karling, 1953 -- valid
  Rogneda westbladi gallica Ax, 1956 -- invalid
  Rognedinae Evdonin, 1977 -- invalid
  Romankenkius Ball, 1974 -- valid
  Romankenkius bilineatus Ball and Tran, 1979 -- valid
  Romankenkius boehmigi (Weiss, 1909) -- valid
  Romankenkius conspectus Sluys and Grant, 2006 -- valid
  Romankenkius glandulosus (Kenk, 1930) -- valid
  Romankenkius hoernesi (Weiss, 1909) -- valid
  Romankenkius impudicus Sluys and Grant, 2006 -- valid
  Romankenkius kenki Ball, 1974 -- valid
  Romankenkius libidinosus Sluys and Rohdes, 1991 -- valid
  Romankenkius michaelseni (Böhmig, 1902) -- invalid
  Romankenkius patagonicus (Borelli, 1901) -- valid
  Romankenkius pedderensis Ball, 1974 -- valid
  Romankenkius retrobursalis Sluys and Grant, 2006 -- valid
  Romankenkius sinuosus Sluys and Kawakatsu, 2001 -- valid
  Rosmarium Marcus, 1950 -- valid
  Rosmarium evelinae Marcus, 1950 -- valid
  Rostracilla Rundell and Leander, 2014 -- invalid
  Rostracilla nuuchahnulthensis Rundell and Leander, 2014 -- invalid
  Ruanis Marcus, 1952 -- valid
  Ruanis pandula Marcus, 1952 -- valid
  Rusalka Uljanin, 1870 -- invalid
  Rusalka pontica Uljanin, 1870 -- invalid
  Sabazius Marcus, 1954 -- valid
  Sabazius brattstroemi Marcus, 1954 -- valid
  Sabulirhynchus Artois and Schockaert, 2000 -- valid
  Sabulirhynchus axi Artois and Schockaert, 2000 -- valid
  Sabussowia Böhmig, 1906 -- valid
  Sabussowia dioica (Claparède, 1863) -- valid
  Sabussowia punctata Brandtner, 1935 -- invalid
  Sabussowia wilhelmii Ball, 1973 -- valid
  Sagittifera Kostenko and Mamkaev, 1990 -- valid
  Sagittifera sagittifera (Ivanov, 1952) -- valid
  Sagittiferidae Kostenko and Mamkaev, 1990 -- invalid
  Sagittiferinae Kostenko and Mamkaev, 1990 -- invalid
  Scanorhynchinae Tessens, Janssen and Artois, 2014 -- valid
  Scanorhynchus Karling, 1955 -- valid
  Scanorhynchus forcipatus Karling, 1955 -- valid
  Scanorhynchus limophilus Karling, 1955 -- valid
  Scanorhynchus modestus Evdonin, 1971 -- invalid
  Schematommatidea Bock, 1913 -- invalid
  Schizochilus Boaden, 1963 -- valid
  Schizochilus bruneti Noldt and Hoxhold, 1984 -- valid
  Schizochilus caecus L'Hardy, 1963 -- valid
  Schizochilus choriurus Boaden, 1963 -- valid
  Schizochilus choriurus caecus L'Hardy, 1963 -- invalid
  Schizochilus choriurus choriurus Boaden, 1963 -- invalid
  Schizochilus hoxholdi Karling, 1989 -- valid
  Schizochilus marcusi Boaden, 1963 -- valid
  Schizochilus martae (Marcus, 1950) -- valid
  Schizochilus parvulus Brunet, 1970 -- valid
  Schizochilus santacruzensis Noldt and Hoxhold, 1984 -- valid
  Schizochilus spiniferus Brunet, 1970 -- valid
  Schizochilus tubulatus Brunet, 1970 -- valid
  Schizoprora Schmidt, 1852 -- invalid
  Schizoprora venenosa Schmidt, 1852 -- invalid
  Schizorhinos Rundell and Leander, 2014 -- invalid
  Schizorhinos vancouverensis Rundell and Leander, 2014 -- invalid
  Schizorhynchia Meixner, 1928 -- invalid
  Schizorhynchidae Graff, 1905 -- valid
  Schizorhynchoides Meixner, 1928 -- valid
  Schizorhynchoides aculeatus L'Hardy, 1963 -- valid
  Schizorhynchoides atopus (Marcus, 1950) -- invalid
  Schizorhynchoides brevistili Noldt, 1989 -- valid
  Schizorhynchoides canaliculatus L'Hardy, 1963 -- valid
  Schizorhynchoides coronostylus Boaden, 1963 -- valid
  Schizorhynchoides diplorchis Meixner, 1928 -- valid
  Schizorhynchoides duplotestes Meixner, 1928 -- invalid
  Schizorhynchoides globulosus Brunet, 1970 -- valid
  Schizorhynchoides karlingi Martens and Schockaert, 1981 -- invalid
  Schizorhynchoides macrostylus L'Hardy, 1963 -- invalid
  Schizorhynchoides martae Marcus, 1950 -- invalid
  Schizorhynchoides meixneri Boaden, 1963 -- valid
  Schizorhynchoides rarus Ax, 1951 -- valid
  Schizorhynchoides spirostylus Boaden, 1963 -- valid
  Schizorhynchoides symmetricus Martens and Schockaert, 1981 -- valid
  Schizorhynchus Hallez, 1894 -- valid
  Schizorhynchus arenarius de Beauchamp, 1927 -- invalid
  Schizorhynchus coecus Hallez, 1894 -- valid
  Schizorhynchus rarus (Ax, 1951) -- invalid
  Schizorhynchus tataricus Graff, 1905 -- valid
  Schizostomum Schmidt, 1848 -- invalid
  Schizostomum productum Schmidt, 1848 -- invalid
  Schmardea Diesing, 1862 -- invalid
  Schmardea rubrocincta (Schmarda, 1859) -- invalid
  Schmidtea Ball, 1974 -- valid
  Schmidtea lugubris (Schmidt, 1861) -- valid
  Schmidtea mediterranea (Benazzi, Baguna, Ballester and Del Papa, 1975) -- valid
  Schmidtea polychroa (Schmidt, 1861) -- valid
  Schmidtea polychroa macroauriculata Casu, Vacca and Pala, 1982 -- valid
  Schmidtea polychroa polychroa (Schmidt, 1861) -- valid
  Schmidtea polychroa wytegrensis (Sabussow, 1907) -- valid
  Schultzia Graff, 1882 -- invalid
  Schultzia adriatica Dörler, 1900 -- invalid
  Schultzia pellucida (Schultze, 1851) -- invalid
  Schultzia pellucida theodosica Pereyaslawzewa, 1892 -- invalid
  Schultzia pothyroideum Pereyaslawzewa, 1892 -- invalid
  Scillyvortex Faubel and Warwick, 2005 -- invalid
  Scillyvortex phytophilus Faubel and Warwick, 2005 -- invalid
  Scleraulophoridae Marcus, 1950 -- valid
  Scleraulophorus Karling, 1940 -- valid
  Scleraulophorus cephalatus Karling, 1940 -- valid
  Scoliopharyngia Ehlers, Mueller and Franke, 1994 -- valid
  Scoliopharyngia arenicola Ehlers, Reise and Armonies, 1995 -- invalid
  Scoliopharyngia listensis Ehlers, Mueller and Franke, 1994 -- valid
  Scutariella Mrazek, 1907 -- valid
  Scutariella didactyla Mrazek, 1907 -- valid
  Scutariella georgica Joffe and Djanashvili, 1981 -- valid
  Scutariella japonica (Matjasic, 1990) -- valid
  Scutariella stammeri Matjasic, 1958 -- valid
  Scutariellidae Annandale, 1912 -- valid
  Scutariellinae Annandale, 1912 -- valid
  Scutarielloidea -- valid
  Seidlia Sabussow, 1911 -- valid
  Seidlia akkeshi (Ichikawa and Kawakatsu, 1963) -- valid
  Seidlia almaatina Sabussow, 1947 -- valid
  Seidlia auriculata (Ijima and Kaburaki, 1916) -- valid
  Seidlia elongata (Sabussow, 1929) -- valid
  Seidlia eurantron Sabussow, 1936 -- invalid
  Seidlia gracilis Sabussow, 1936 -- valid
  Seidlia hamica Liu, 1996 -- valid
  Seidlia lactea Sabussow, 1936 -- valid
  Seidlia relicta (Sabussow, 1929) -- invalid
  Seidlia remota (Smith, 1988) -- valid
  Seidlia sabussowi (Seidl, 1911) -- valid
  Seidlia sabussowi almaatina Sabussow, 1947 -- invalid
  Seidlia schmidti (Sabussow, 1916) -- valid
  Seidlia sierrensis (Kenk, 1973) -- invalid
  Seidlia stummeri (Seidl, 1911) -- invalid
  Sekerana Sekera, 1912 -- valid
  Sekerana stolzi (Sekera, 1912) -- valid
  Selimia Ax, 1959 -- valid
  Selimia similis Ax, 1959 -- valid
  Selimia vivida Ax, 1959 -- valid
  Semonia Plehn, 1896 -- valid
  Semonia maculata Plehn, 1896 -- valid
  Semonia penangensis Laidlaw, 1903 -- invalid
  Separata Reisinger, 1924 -- invalid
  Sergia Nasonov, 1923 -- valid
  Sergia calae Noreña, Damborenea and Escobedo, 2006 -- valid
  Sergia mancala Marcus and Du Bois-Reymond Marcus, 1957 -- valid
  Sergia maricola Marcus, 1957 -- valid
  Sergia sergia (Beklemischev, 1919) -- valid
  Seritia Cannon, 1982 -- valid
  Seritia elegans (Westblad, 1953) -- valid
  Seritia striata (Hickman, 1955) -- valid
  Serpentiplana Karling, 1964 -- valid
  Serpentiplana doughertyi Karling, 1964 -- valid
  Serratorhynchus Noldt, 1988 -- valid
  Serratorhynchus stellatus Noldt, 1988 -- valid
  Serrula Schockaert, Curini-Galletti, De Ridder, Volonterio and Artois, 2009 -- valid
  Serrula acuta Schockaert, Curini-Galletti, De Ridder, Volonterio and Artois, 2009 -- valid
  Serrula byronenis Schockaert, Curini-Galletti, De Ridder, Volonterio and Artois, 2009 -- valid
  Serrula concharum Schockaert, Curini-Galletti, De Ridder, Volonterio and Artois, 2009 -- valid
  Serrula maxillaria Schockaert, Curini-Galletti, De Ridder, Volonterio and Artois, 2009 -- valid
  Shelfordia Stummer-Traunfels, 1902 -- invalid
  Shelfordia annadalei Kaburaki, 1918 -- invalid
  Shelfordia annandalei Kaburaki, 1918 -- invalid
  Shelfordia annardalei Kaburaki, 1918 -- invalid
  Shelfordia borneensis Stummer-Traunfels, 1902 -- invalid
  Siccomacrostomum Schmidt and Sopott-Ehlers, 1976 -- valid
  Siccomacrostomum triviale Schmidt and Sopott-Ehlers, 1976 -- valid
  Simpliciplana Kaburaki, 1923 -- valid
  Simpliciplana marginata Kaburaki, 1923 -- valid
  Simplicomorpha Dörjes, 1968 -- valid
  Simplicomorpha gigantorhabditis Dörjes, 1968 -- valid
  Simplicomorpha viridis (Dörjes, 1968) -- valid
  Simsagittifera Kostenko and Mamkaev, 1990 -- invalid
  Siphoniella Westblad, 1952 -- invalid
  Siphoniella anderssoni Westblad, 1952 -- invalid
  Sitnikovaella Timoshkin, 2004 -- valid
  Sitnikovaella schevelevae Timoshkin, 2004 -- valid
  Smithsoniarhynches Hochberg, 2004 -- valid
  Smithsoniarhynches sherryreedae Hochberg, 2004 -- valid
  Socorria de Beauchamp, 1913 -- invalid
  Socorria uncinata de Beauchamp, 1913 -- invalid
  Solenofilomorpha Dörjes, 1968 -- valid
  Solenofilomorpha funilis Crezee, 1975 -- valid
  Solenofilomorpha guaymensis Crezee, 1975 -- valid
  Solenofilomorpha justinei Nilsson, Wallberg and Jondelius, 2011 -- valid
  Solenofilomorpha longissima Dörjes, 1968 -- valid
  Solenofilomorpha pellucida Kċnneby and Jondelius, 2013 -- valid
  Solenofilomorphidae Dörjes, 1968 -- valid
  Solenopharyngidae Graff, 1882 -- valid
  Solenopharynginae Graff, 1882 -- valid
  Solenopharynx Graff, 1882 -- valid
  Solenopharynx anophthalmus Meixner, 1929 -- invalid
  Solenopharynx balticus Meixner, 1938 -- invalid
  Solenopharynx flavidus Graff, 1882 -- valid
  Solenopharynx oculatus (Pereyaslawzewa, 1892) -- invalid
  Solenopharynx pulchella (Uljanin, 1870) -- invalid
  Sopharynx Beklemischev, 1929 -- valid
  Sopharynx oculatus (Pereyaslawzewa, 1892) -- valid
  Sopharynx typhlops Beklemischev, 1929 -- valid
  Sorocelis Grube, 1872 -- valid
  Sorocelis aculeata Korotneff, 1912 -- valid
  Sorocelis alba Sabussow, 1903 -- invalid
  Sorocelis albifrons Korotneff, 1910 -- valid
  Sorocelis americana Hyman, 1939 -- invalid
  Sorocelis angarensis Korotneff, 1912 -- valid
  Sorocelis arcellaris Korotneff, 1912 -- invalid
  Sorocelis argillosa Korotneff, 1912 -- invalid
  Sorocelis bilineata Korotneff, 1912 -- invalid
  Sorocelis bipartita Sabussow, 1903 -- valid
  Sorocelis copulatrix Korotneff, 1912 -- invalid
  Sorocelis cotyloides Korotneff, 1912 -- invalid
  Sorocelis eburnea Muth, 1912 -- invalid
  Sorocelis elongata Sabussow, 1929 -- invalid
  Sorocelis eudendrocoeloides Sabussow, 1929 -- valid
  Sorocelis fulva Korotneff, 1912 -- invalid
  Sorocelis fulvescens Korotneff, 1912 -- invalid
  Sorocelis fungiformis Sabussow, 1903 -- invalid
  Sorocelis fusca Sabussow, 1903 -- invalid
  Sorocelis garjajewi Sabussow, 1903 -- invalid
  Sorocelis gracilis Korotneff, 1912 -- valid
  Sorocelis gracilis Seidl, 1911 -- invalid
  Sorocelis graffi Korotneff, 1912 -- invalid
  Sorocelis graffii Sabussow, 1903 -- invalid
  Sorocelis grisea Sabussow, 1903 -- invalid
  Sorocelis guttata (Gerstfeldt, 1858) -- invalid
  Sorocelis hepatizon (Grube, 1872) -- valid
  Sorocelis incerta (Korotneff, 1912) -- valid
  Sorocelis junca Korotneff, 1912 -- invalid
  Sorocelis koslowi Sabussow, 1911 -- invalid
  Sorocelis lactea Seidl, 1911 -- invalid
  Sorocelis lactea Korotneff, 1912 -- invalid
  Sorocelis leucocephala Sabussow, 1903 -- invalid
  Sorocelis leucocephala bifasciata Sabussow, 1903 -- invalid
  Sorocelis linearis Sabussow, 1911 -- valid
  Sorocelis lineata Sabussow, 1903 -- invalid
  Sorocelis lobata Korotneff, 1912 -- invalid
  Sorocelis lutea Korotneff, 1912 -- invalid
  Sorocelis maculosa Korotneff, 1912 -- invalid
  Sorocelis melanocinerea Korotneff, 1912 -- invalid
  Sorocelis mongolica Sabussow, 1911 -- valid
  Sorocelis nigrescens Korotneff, 1912 -- invalid
  Sorocelis nigrofasciata (Grube, 1872) -- valid
  Sorocelis nigrofasciata boehmigi Sabussow, 1911 -- valid
  Sorocelis nigrofasciata nigrofasciata (Grube, 1872) -- valid
  Sorocelis nigromaculata Korotneff, 1912 -- invalid
  Sorocelis obscura Korotneff, 1912 -- invalid
  Sorocelis ocellata Korotneff, 1912 -- invalid
  Sorocelis oculimarginata Palombi, 1931 -- invalid
  Sorocelis pardalina (Grube, 1872) -- invalid
  Sorocelis parvipunctata Korotneff, 1912 -- invalid
  Sorocelis pingata (Korotneff, 1912) -- valid
  Sorocelis plana Sabussow, 1903 -- invalid
  Sorocelis polyophthalma Korotneff, 1912 -- invalid
  Sorocelis raddei Sabussow, 1911 -- invalid
  Sorocelis relicta Sabussow, 1929 -- invalid
  Sorocelis reticulosa Korotneff, 1912 -- invalid
  Sorocelis retiformis Korotneff, 1912 -- invalid
  Sorocelis rosea Sabussow, 1903 -- valid
  Sorocelis sabussowi Seidl, 1911 -- invalid
  Sorocelis sapporo Ijima and Kaburaki, 1916 -- invalid
  Sorocelis stellomaculata Korotneff, 1912 -- invalid
  Sorocelis stringulata (Korotneff, 1912) -- invalid
  Sorocelis stummeri Seidl, 1911 -- invalid
  Sorocelis subfulva Korotneff, 1912 -- invalid
  Sorocelis subnigra Korotneff, 1912 -- invalid
  Sorocelis subrufa Korotneff, 1912 -- invalid
  Sorocelis tenuis Sabussow, 1903 -- invalid
  Sorocelis tibetica Sabussow, 1911 -- invalid
  Sorocelis tigrina (Grube, 1872) -- invalid
  Sorocelis transversostriata (Korotneff, 1912) -- valid
  Sorocelis usitata Korotneff, 1912 -- valid
  Sorocelis ussowii Sabussow, 1903 -- invalid
  Sorocelis variegata Korotneff, 1912 -- invalid
  Sorocelis versicolor Korotneff, 1912 -- invalid
  Sorocelis zigestes Korotneff, 1912 -- invalid
  Sorocelopsis Komarek, 1919 -- invalid
  Sorocelopsis decemoculata Komarek, 1919 -- invalid
  Spathula Nurse, 1950 -- valid
  Spathula agelaea Hay and Ball, 1979 -- valid
  Spathula alba Allison, 1997 -- valid
  Spathula camara Ball, 1977 -- valid
  Spathula dittae Ball and Tran, 1979 -- valid
  Spathula foeni Ball, 1977 -- valid
  Spathula fontinalis Nurse, 1950 -- invalid
  Spathula gourbaultae Ball, 1977 -- valid
  Spathula limicola (Nurse, 1950) -- valid
  Spathula miserabile Sluys and Grant, 2006 -- valid
  Spathula musculosa Sluys and Grant, 2006 -- valid
  Spathula neara Ball, 1977 -- valid
  Spathula ochyra Ball and Tran, 1979 -- valid
  Spathula schauinslandi (Neppi, 1904) -- invalid
  Spathula simplex Sluys and Grant, 2006 -- valid
  Spathula truculenta Ball, 1977 -- valid
  Spathula tryssa Ball, 1977 -- valid
  Sphaerocephalus Loman, 1888 -- invalid
  Sphagnella Sekera, 1912 -- valid
  Sphagnella lutheri Sekera, 1912 -- valid
  Sphalloplana de Beauchamp, 1931 -- valid
  Sphalloplana (Polypharyngea) Carpenter, 1971 -- invalid
  Sphalloplana (Speophila) Hyman, 1937 -- valid
  Sphalloplana (Sphalloplana) de Beauchamp, 1931 -- valid
  Sphalloplana alabamensis Hyman, 1945 -- valid
  Sphalloplana buchanani (Hyman, 1937) -- valid
  Sphalloplana californica Kenk, 1977 -- valid
  Sphalloplana chandleri Kenk, 1977 -- valid
  Sphalloplana consimilis Kenk, 1977 -- valid
  Sphalloplana coreana Kawakatsu and Kim, 1967 -- valid
  Sphalloplana culveri Kenk, 1977 -- valid
  Sphalloplana ductosacculata Livanov and Zabusova, 1940 -- valid
  Sphalloplana evaginata Kenk, 1977 -- valid
  Sphalloplana georgiana Hyman, 1954 -- valid
  Sphalloplana hoffmasteri (Hyman, 1954) -- valid
  Sphalloplana holsingeri Kenk, 1977 -- valid
  Sphalloplana hubrichti Hyman, 1945 -- valid
  Sphalloplana hypogea Kenk, 1984 -- valid
  Sphalloplana kansensis Hyman, 1945 -- valid
  Sphalloplana kutscheri Mitchell, 1968 -- valid
  Sphalloplana mohri Hyman, 1938 -- valid
  Sphalloplana percoeca (Packard, 1879) -- valid
  Sphalloplana pricei (Hyman, 1937) -- valid
  Sphalloplana reddelli Mitchell, 1968 -- valid
  Sphalloplana sloani Mitchell, 1968 -- valid
  Sphalloplana subtilis Kenk, 1977 -- valid
  Sphalloplana virginiana Hyman, 1945 -- valid
  Sphalloplana weingartneri Kenk, 1970 -- valid
  Sphalloplana zeschi Mitchell, 1968 -- valid
  Sphyngiceps Collingwood, 1876 -- invalid
  Sphyngiceps lacteus Collingwood, 1876 -- invalid
  Sphyrocephalus Bleeker, 1844 -- invalid
  Sphyrocephalus albo-coeruleus Bleeker, 1844 -- invalid
  Sphyrocephalus albocoeruleus Bleeker, 1844 -- invalid
  Sphyrocephalus dendrophilus Schmarda, 1859 -- invalid
  Sphyrocephalus kewense (Moseley, 1878) -- invalid
  Sphyrocephalus marginatum Bleeker, 1844 -- invalid
  Sphyrocephalus niger Bleeker, 1844 -- invalid
  Sphyrocephalus unistriatus Kuhl and Hasselt, 1822 -- invalid
  Sphyrocephalus vittatus (Loman, 1888) -- invalid
  Spinantia Faubel, 1983 -- valid
  Spinantia pellucida (Pearse, 1938) -- valid
  Spinicirrus Hyman, 1953 -- valid
  Spinicirrus inequalis Hyman, 1953 -- valid
  Spiroclytus Schmidt, 1857 -- invalid
  Spiroclytus capitata (Ĝrsted, 1844) -- invalid
  Spiroclytus euryalus (Schmidt, 1852) -- invalid
  Spiroclytus nisus Schmidt, 1857 -- invalid
  Spiroclytus setigerus (Schmidt, 1852) -- invalid
  Spiroclytus setosus (Schmarda, 1859) -- invalid
  Statomicroplana Kawakatsu, E. M. Froehlich, Jones, Ogren and Sasaki, 2003 -- valid
  Statomicroplana capensis (Graff, 1899) -- valid
  Statomicroplana cockerelli (Graff, 1899) -- valid
  Statomicroplana ehrenbergi (Graff, 1899) -- valid
  Statomicroplana flavum (Moseley, 1877) -- valid
  Statomicroplana fuliginea (Graff, 1899) -- valid
  Statomicroplana fuscum (Moseley, 1877) -- valid
  Statomicroplana gebavoeltzkowi (Ogren and Kawakatsu, 1988) -- valid
  Statomicroplana haeckeli (Graff, 1899) -- valid
  Statomicroplana knysensis (Graff, 1899) -- valid
  Statomicroplana kuekenthali (Mell, 1903) -- valid
  Statomicroplana pyrenaica (Graff, 1893) -- valid
  Statomicroplana ruteocephala (Kaburaki, 1922) -- valid
  Statomicroplana teres (Graff, 1899) -- valid
  Statomicroplana tetracladea (Wilczynski, 1920) -- valid
  Statomicroplana zenkeri (Graff, 1899) -- valid
  Stenostomidae Vejdovsky, 1880 -- valid
  Stenostomum Schmidt, 1848 -- valid
  Stenostomum agile Silliman, 1884 -- invalid
  Stenostomum agile japonicum Okugawa, 1930 -- invalid
  Stenostomum amphotum Marcus, 1945 -- valid
  Stenostomum anatirostrum Marcus, 1945 -- valid
  Stenostomum anophthalmum An der Lan, 1955 -- valid
  Stenostomum anops Nuttycombe and Waters, 1938 -- valid
  Stenostomum arevaloi Gieysztor, 1931 -- valid
  Stenostomum arevaloi arevaloi Gieysztor, 1931 -- valid
  Stenostomum arevaloi franconia Bauchhenss, 1971 -- valid
  Stenostomum ashanika Damborenea, Brusa, Almagro and Noreña, 2011 -- valid
  Stenostomum beauchampi Papi, 1967 -- valid
  Stenostomum beryli Young and Kolasa, 1974 -- valid
  Stenostomum bicaudatum Kennel, 1888 -- valid
  Stenostomum binum (Schmarda, 1859) -- valid
  Stenostomum brevipharyngium Kepner and Carter, 1931 -- valid
  Stenostomum bryophilum Luther, 1960 -- valid
  Stenostomum carnivorum E. Jones, 1932 -- invalid
  Stenostomum caudatum Markow, 1904 -- valid
  Stenostomum ciliatum Kepner and Carter, 1931 -- valid
  Stenostomum coluber Leydig, 1854 -- invalid
  Stenostomum constrictum Papi in Luther, 1960 -- valid
  Stenostomum corderoi Marcus, 1945 -- valid
  Stenostomum corderoi corderoi Marcus, 1945 -- valid
  Stenostomum corderoi poznanensis Kolasa and Young, 1974 -- valid
  Stenostomum cryptops Nuttycombe and Waters, 1935 -- valid
  Stenostomum evelinae Marcus, 1945 -- valid
  Stenostomum fasciatum Vejdovsky, 1880 -- valid
  Stenostomum giganteum Higley, 1918 -- invalid
  Stenostomum gigerium Kepner and Carter, 1931 -- valid
  Stenostomum gilvum Böhmig, 1898 -- valid
  Stenostomum glandiferum Higley, 1918 -- invalid
  Stenostomum glandulosum Kepner and Carter, 1931 -- valid
  Stenostomum gotlandense Larsson and Willems, 2010 -- valid
  Stenostomum grabbskogense Luther, 1960 -- valid
  Stenostomum gracile (Leidy, 1851) -- invalid
  Stenostomum grande Child, 1902 -- valid
  Stenostomum grande grande Child, 1902 -- valid
  Stenostomum grande megista Marcus, 1945 -- valid
  Stenostomum grande typica Marcus, 1945 -- valid
  Stenostomum handoelense Larsson and Willems, 2010 -- valid
  Stenostomum heebuktense Larsson and Willems, 2010 -- valid
  Stenostomum hemisphericum Nasonov, 1924 -- valid
  Stenostomum hystrix Keller, 1895 -- valid
  Stenostomum ignavum Vejdovsky, 1880 -- valid
  Stenostomum incaudatum Sonneborn, 1930 -- invalid
  Stenostomum karlingi Luther, 1960 -- valid
  Stenostomum kepneri Nuttycombe and Waters, 1938 -- valid
  Stenostomum langi Keller, 1894 -- valid
  Stenostomum lemnae (A. L. Dugès, 1832) -- invalid
  Stenostomum leucops (A. L. Dugès, 1828) -- valid
  Stenostomum leucops aquariorum Luther, 1960 -- valid
  Stenostomum leucops leucops (A. L. Dugès, 1828) -- valid
  Stenostomum macedonicus (Picken, 1937) -- valid
  Stenostomum mandibulatum Kepner and Carter, 1931 -- valid
  Stenostomum materazzoi Marcus, 1949 -- valid
  Stenostomum membranosum Kepner and Carter, 1931 -- valid
  Stenostomum middendorffii Braun, 1885 -- valid
  Stenostomum monocelis Schmidt, 1878 -- invalid
  Stenostomum neoboracense Girard, 1893 -- invalid
  Stenostomum occultum Kolasa, 1971 -- valid
  Stenostomum oesophagum Kepner and Carter, 1931 -- invalid
  Stenostomum paraguayense (Martin, 1908) -- valid
  Stenostomum pegephilum Nuttycombe and Waters, 1938 -- valid
  Stenostomum perforatum Beklemischev, 1921 -- valid
  Stenostomum predatorium Kepner and Carter, 1931 -- valid
  Stenostomum pseudoacetabulum Nuttycombe and Waters, 1935 -- valid
  Stenostomum quaterna (Schmarda, 1859) -- invalid
  Stenostomum rhachiocaudatum Nuttycombe, 1932 -- invalid
  Stenostomum romanae Kolasa, 1981 -- valid
  Stenostomum rosulatum Marcus, 1945 -- valid
  Stenostomum saliens Kepner and Carter, 1931 -- valid
  Stenostomum saltatum Kepner and Carter, 1931 -- invalid
  Stenostomum sieboldi Graff, 1878 -- valid
  Stenostomum simplex Kepner and Carter, 1931 -- valid
  Stenostomum speciosum Stringer, 1918 -- invalid
  Stenostomum sphagnetorum Papi in Luther, 1960 -- valid
  Stenostomum steveoi Larsson and Willems, 2010 -- valid
  Stenostomum sthenium Borkott, 1970 -- valid
  Stenostomum stuhlmanni Böhmig, 1897 -- invalid
  Stenostomum tauricum Nasonov, 1924 -- invalid
  Stenostomum temporaneum Kolasa, 1981 -- valid
  Stenostomum tenuicauda Graff, 1911 -- invalid
  Stenostomum tenuicaudatum Graff, 1911 -- invalid
  Stenostomum torneense Schmidt, 1852 -- invalid
  Stenostomum tsinghuaensis Tu, 1934 -- invalid
  Stenostomum tuberculosum Nuttycombe and Waters, 1938 -- valid
  Stenostomum turgidum Zacharias, 1902 -- invalid
  Stenostomum unicolor Schmidt, 1848 -- invalid
  Stenostomum unicolor constrictum Papi in Luther, 1960 -- invalid
  Stenostomum uronephrium Nuttycombe, 1931 -- valid
  Stenostomum ventronephrium Nuttycombe, 1932 -- valid
  Stenostomum virginianum Nuttycombe, 1931 -- valid
  Sterreria Lundin, 2000 -- valid
  Sterreria boucheti Meyer-Wachsmuth, Curini Galletti and Jondelius, 2014 -- valid
  Sterreria lundini Meyer-Wachsmuth, Curini Galletti and Jondelius, 2014 -- valid
  Sterreria martindalei Meyer-Wachsmuth, Curini Galletti and Jondelius, 2014 -- valid
  Sterreria monolithes Meyer-Wachsmuth, Curini Galletti and Jondelius, 2014 -- valid
  Sterreria papuensis Meyer-Wachsmuth, Curini Galletti and Jondelius, 2014 -- valid
  Sterreria psammicola (Sterrer, 1970) -- valid
  Sterreria rubra (Faubel, 1976) -- valid
  Sterreria variabilis Meyer-Wachsmuth, Curini Galletti and Jondelius, 2014 -- valid
  Sterreria ylvae Meyer-Wachsmuth, Curini Galletti and Jondelius, 2014 -- valid
  Stilivannuccia Faubel and Rohde, 1998 -- valid
  Stilivannuccia glandulifera Faubel and Rohde, 1998 -- valid
  Stilivannuccia hastata (Ax and Ax, 1974) -- valid
  Stilivannuccia umbilica (Sopott, 1972) -- valid
  Stomatricha Hooge, 2003 -- valid
  Stomatricha hochbergi Hooge, 2003 -- valid
  Stradorhynchus Willems, Schockaert and Artois, 2006 -- valid
  Stradorhynchus caecus Willems, Schockaert and Artois, 2006 -- valid
  Stradorhynchus terminalis Willems, Schockaert and Artois, 2006 -- valid
  Strongylostoma Ĝrsted, 1844 -- valid
  Strongylostoma andicola Schmarda, 1859 -- invalid
  Strongylostoma assimile Ĝrsted, 1844 -- invalid
  Strongylostoma caecum Sekera, 1912 -- valid
  Strongylostoma cirratum Beklemischev, 1922 -- valid
  Strongylostoma coerulescens Schmarda, 1859 -- invalid
  Strongylostoma devleeschouweri Van Steenkiste, Gobert, Davison, Kolasa and Artois, 2011 -- valid
  Strongylostoma dicorymbum Marcus, 1946 -- valid
  Strongylostoma elongatum Hofsten, 1907 -- valid
  Strongylostoma elongatum elongatum Hofsten, 1907 -- valid
  Strongylostoma elongatum spinosum Luther, 1950 -- valid
  Strongylostoma gonocephalum (Silliman, 1884) -- valid
  Strongylostoma lanceolatum Sekera, 1912 -- invalid
  Strongylostoma levandovskii Nasonov, 1924 -- valid
  Strongylostoma metopoglenum Schmarda, 1859 -- invalid
  Strongylostoma radiata (O. F. Müller, 1773) -- valid
  Strongylostoma radiata caecum Sekera, 1906 -- invalid
  Strongylostoma rosaceum Higley, 1918 -- invalid
  Strongylostoma simplex Meixner, 1915 -- valid
  Strongylostoma simplex lapponicum Papi in Luther, 1963 -- valid
  Strongylostoma simplex simplex Meixner, 1915 -- valid
  Stummeria Böhmig, 1908 -- valid
  Stummeria marginata (Hallez, 1906) -- valid
  Stummeria trigonocephala (Ijima and Kaburaki, 1916) -- invalid
  Stummerinae Böhmig, 1908 -- invalid
  Stygodyticola Matjasic, 1958 -- valid
  Stygodyticola hadzii Matjasic, 1958 -- valid
  Stygolepta Faubel, 1984 -- valid
  Stygolepta hjalmari Faubel, 1984 -- valid
  Stygoplanellina Ax, 1954 -- valid
  Stygoplanellina halophila Ax, 1954 -- valid
  Stygoplanellina saksunensis Ax, 2008 -- valid
  Stylacium Corda, 1838 -- invalid
  Stylacium isabellinum Corda, 1838 -- invalid
  Stylochidae Stimpson, 1857 -- valid
  Stylochinae Stimpson, 1857 -- invalid
  Stylochocestidae Bock, 1913 -- valid
  Stylochocestus Laidlaw, 1904 -- valid
  Stylochocestus gracilis Laidlaw, 1904 -- valid
  Stylochocestus hewatti (Hyman, 1955) -- valid
  Stylochoidea Stimpson, 1857 -- valid
  Stylochoides Hallez, 1907 -- valid
  Stylochoides albus (Hallez, 1905) -- valid
  Stylochoididae Bock, 1913 -- valid
  Stylochoplana Stimpson, 1857 -- valid
  Stylochoplana (Stylochoplanoides) Bock, 1924 -- invalid
  Stylochoplana aberrans Kato, 1944 -- valid
  Stylochoplana affinis Palombi, 1940 -- invalid
  Stylochoplana agilis Lang, 1884 -- invalid
  Stylochoplana alcha (Marcus and Marcus, 1968) -- valid
  Stylochoplana amica Kato, 1937 -- valid
  Stylochoplana angusta (Verrill, 1893) -- invalid
  Stylochoplana aulica Marcus, 1947 -- invalid
  Stylochoplana bayeri Marcus and Marcus, 1968 -- invalid
  Stylochoplana californica Woodworth, 1894 -- invalid
  Stylochoplana caraibica Palombi, 1923 -- invalid
  Stylochoplana challengeri (Graff, 1892) -- invalid
  Stylochoplana chilensis (Schmarda, 1859) -- valid
  Stylochoplana chloranota (Boone, 1929) -- valid
  Stylochoplana clara Kato, 1937 -- valid
  Stylochoplana conoceraea (Schmarda, 1859) -- invalid
  Stylochoplana diaphana (Stummer-Traunfels, 1933) -- invalid
  Stylochoplana divae (Marcus, 1949) -- valid
  Stylochoplana divae Marcus, 1947 -- invalid
  Stylochoplana elegans (Kelaart, 1858) -- valid
  Stylochoplana evelinae Marcus, 1952 -- invalid
  Stylochoplana fasciata (Schmarda, 1859) -- invalid
  Stylochoplana floridana Pearse, 1938 -- invalid
  Stylochoplana folia (Grube, 1840) -- invalid
  Stylochoplana folium (Grube, 1840) -- invalid
  Stylochoplana genicotyla Palombi, 1939 -- valid
  Stylochoplana genicotyle Palombi, 1939 -- invalid
  Stylochoplana gracilis Heath and McGregor, 1912 -- invalid
  Stylochoplana graffi (Laidlaw, 1906) -- valid
  Stylochoplana hancocki Hyman, 1953 -- invalid
  Stylochoplana heathi Boone, 1929 -- invalid
  Stylochoplana inquilina Hyman, 1950 -- valid
  Stylochoplana lactoalba (Verrill, 1900) -- invalid
  Stylochoplana leptalea Marcus, 1947 -- invalid
  Stylochoplana limnoriae (Hyman, 1953) -- valid
  Stylochoplana longastyletta Freeman, 1933 -- invalid
  Stylochoplana longipenis Hyman, 1953 -- invalid
  Stylochoplana lynca Du Bois-Reymond Marcus, 1958 -- invalid
  Stylochoplana maculata (Quatrefage, 1845) -- valid
  Stylochoplana meleagrina (Kelaart, 1858) -- invalid
  Stylochoplana minuta Hyman, 1959 -- valid
  Stylochoplana nadiae (Melouk, 1941) -- valid
  Stylochoplana nationalis Plehn, 1896 -- invalid
  Stylochoplana oculifera (Girard, 1853) -- invalid
  Stylochoplana oculifera (Verrill, 1892) -- invalid
  Stylochoplana opisthopharynx (Palombi, 1928) -- valid
  Stylochoplana pallida (Quatrefage, 1845) -- invalid
  Stylochoplana palmula (Quatrefage, 1845) -- invalid
  Stylochoplana panamensis (Plehn, 1896) -- invalid
  Stylochoplana parasitica Kato, 1935 -- valid
  Stylochoplana parva Palombi, 1939 -- valid
  Stylochoplana plehni Bock, 1913 -- invalid
  Stylochoplana pusilla Bock, 1924 -- invalid
  Stylochoplana reishi Hyman, 1959 -- invalid
  Stylochoplana reticulata (Stimpson, 1855) -- invalid
  Stylochoplana robusta (Palombi, 1928) -- invalid
  Stylochoplana sargassicola (Mertens, 1833) -- invalid
  Stylochoplana schauinslandi (Plehn, 1899) -- valid
  Stylochoplana selenopsis Marcus, 1947 -- valid
  Stylochoplana siamensis Palombi, 1923 -- invalid
  Stylochoplana snadda Marcus and Marcus, 1968 -- invalid
  Stylochoplana suesensis Palombi, 1939 -- valid
  Stylochoplana suoensis Kato, 1943 -- valid
  Stylochoplana taiwanica Kato, 1943 -- invalid
  Stylochoplana tarda (Graff, 1878) -- valid
  Stylochoplana taurica Jacubowa, 1909 -- invalid
  Stylochoplana tenera Stimpson, 1857 -- invalid
  Stylochoplana tenuis Stimpson, 1857 -- invalid
  Stylochoplana tenuis Palombi, 1936 -- invalid
  Stylochoplana utinomii Kato, 1943 -- valid
  Stylochoplana vesiculata Palombi, 1940 -- invalid
  Stylochoplana viridis Freeman, 1933 -- invalid
  Stylochoplana walsergia Marcus and Marcus, 1968 -- valid
  Stylochoplana wyona Marcus and Marcus, 1968 -- invalid
  Stylochoplanidae Meixner, 1907 -- valid
  Stylochoplaninae Meixner, 1907 -- invalid
  Stylochoposthia Faubel, 1983 -- valid
  Stylochoposthia bella (Hyman, 1959) -- valid
  Stylochopsis Stimpson, 1857 -- invalid
  Stylochopsis Collingwood, 1876 -- invalid
  Stylochopsis conglomeratus Stimpson, 1857 -- invalid
  Stylochopsis ellipticus (Girard, 1850) -- invalid
  Stylochopsis lateralis Girard, 1894 -- invalid
  Stylochopsis limosus Stimpson, 1857 -- invalid
  Stylochopsis littoralis Verrill, 1874 -- invalid
  Stylochopsis malayensis Collingwood, 1876 -- invalid
  Stylochopsis pilidium Goette, 1881 -- invalid
  Stylochopsis ponticus Metschnikoff, 1877 -- valid
  Stylochopsis zebra Verrill, 1882 -- invalid
  Stylochus Ehrenberg, 1831 -- valid
  Stylochus (Imogine) Girard, 1853 -- invalid
  Stylochus albus Hallez, 1905 -- invalid
  Stylochus alexandrinus Steinböck, 1937 -- valid
  Stylochus amphibolus Schmarda, 1859 -- invalid
  Stylochus aomori Kato, 1937 -- invalid
  Stylochus arenosus Willey, 1897 -- invalid
  Stylochus argus Czerniavsky, 1881 -- valid
  Stylochus atentaculatus Hyman, 1953 -- valid
  Stylochus bermudensis Verrill, 1901 -- valid
  Stylochus californicus Hyman, 1953 -- valid
  Stylochus castaneus Palombi, 1939 -- valid
  Stylochus catus Du Bois-Reymond Marcus, 1958 -- invalid
  Stylochus ceylanicus Laidlaw, 1904 -- invalid
  Stylochus cinereus Willey, 1897 -- valid
  Stylochus conglomeratus (Stimpson, 1857) -- valid
  Stylochus conoceraea (Schmarda, 1859) -- invalid
  Stylochus conoceraeus (Schmarda, 1859) -- invalid
  Stylochus corniculatus (Dalyell, 1853) -- invalid
  Stylochus corniculatus Stimpson, 1855 -- invalid
  Stylochus coseirensis Bock, 1925 -- invalid
  Stylochus crassus Verrill, 1892 -- valid
  Stylochus crassus Bock, 1931 -- invalid
  Stylochus dictyotus Schmarda, 1859 -- invalid
  Stylochus djiboutiensis Meixner, 1907 -- valid
  Stylochus ellipticus (Girard, 1850) -- valid
  Stylochus exiguus Hyman, 1953 -- invalid
  Stylochus fasciatus Schmarda, 1859 -- invalid
  Stylochus ferox Bock, 1925 -- valid
  Stylochus flevensis Hofker, 1930 -- valid
  Stylochus floridanus Pearse, 1938 -- invalid
  Stylochus folium Grube, 1840 -- invalid
  Stylochus franciscanus Hyman, 1953 -- valid
  Stylochus frontalis Verrill, 1892 -- valid
  Stylochus gaimardi (Blainville, 1828) -- invalid
  Stylochus hamanensis Kato, 1944 -- invalid
  Stylochus heteroglenus Schmarda, 1859 -- invalid
  Stylochus hyalinus Bock, 1913 -- invalid
  Stylochus ijimai Yeri and Kaburaki, 1918 -- invalid
  Stylochus inimicus Palombi, 1931 -- invalid
  Stylochus insolitus Hyman, 1953 -- valid
  Stylochus isifer Du Bois-Reymond Marcus, 1955 -- invalid
  Stylochus izuensis Kato, 1944 -- invalid
  Stylochus limosus (Stimpson, 1857) -- valid
  Stylochus linteus (J. Müller, 1854) -- invalid
  Stylochus littoralis (Verrill, 1874) -- invalid
  Stylochus luteus (J. Müller, 1854) -- valid
  Stylochus maculatus Quatrefage, 1845 -- invalid
  Stylochus marginatus (Stimpson, 1857) -- invalid
  Stylochus marmoreus Bock, 1925 -- invalid
  Stylochus martae Marcus, 1947 -- invalid
  Stylochus matatasi Newman and Cannon, 1993 -- valid
  Stylochus mediterraneus Galleni, 1976 -- invalid
  Stylochus megalops (Schmarda, 1859) -- invalid
  Stylochus meixneri Bock, 1925 -- valid
  Stylochus meridianus Prudhoe, 1989 -- valid
  Stylochus mertensi Diesing, 1850 -- invalid
  Stylochus minimus Palombi, 1940 -- invalid
  Stylochus miyadii Kato, 1944 -- invalid
  Stylochus neapolitanus (Delle Chiaje, 1841) -- valid
  Stylochus nebulosus (Girard, 1853) -- invalid
  Stylochus obscurus Stimpson, 1857 -- invalid
  Stylochus oculiferus (Girard, 1853) -- invalid
  Stylochus oligochlaenus Grube, 1868 -- invalid
  Stylochus oligoglenus Schmarda, 1859 -- invalid
  Stylochus orientalis Bock, 1913 -- invalid
  Stylochus orientalis splendida Bock, 1913 -- invalid
  Stylochus oxyceraeus Schmarda, 1859 -- invalid
  Stylochus palmula Quatrefage, 1845 -- invalid
  Stylochus papillosus Diesing, 1836 -- invalid
  Stylochus pelagicus Moseley, 1877 -- invalid
  Stylochus pellucidus (Mertens, 1833) -- invalid
  Stylochus pilidium (Goette, 1881) -- valid
  Stylochus plessissii Lang, 1884 -- valid
  Stylochus pulcher Hyman, 1940 -- invalid
  Stylochus pusillus Bock, 1913 -- invalid
  Stylochus pygmaeus Merory and Newman, 2005 -- valid
  Stylochus refertus Du Bois-Reymond Marcus, 1965 -- invalid
  Stylochus reticulatus Meyer, 1922 -- invalid
  Stylochus reticulatus Meixner, 1907 -- invalid
  Stylochus reticulatus Stimpson, 1855 -- invalid
  Stylochus roseus Sars, 1878 -- invalid
  Stylochus rutilis Yeri and Kaburaki, 1918 -- invalid
  Stylochus salmoneus Meixner, 1907 -- valid
  Stylochus sargassicola (Mertens, 1833) -- invalid
  Stylochus sixteni Marcus, 1947 -- invalid
  Stylochus speciosus Kato, 1937 -- invalid
  Stylochus stellatus Jennings and Newman, 1996 -- valid
  Stylochus suesensis Ehrenberg, 1831 -- valid
  Stylochus tardus Graff, 1878 -- invalid
  Stylochus tauricus Jakubova, 1909 -- valid
  Stylochus tenax Palombi, 1936 -- invalid
  Stylochus tener (Stimpson, 1857) -- invalid
  Stylochus ticus Marcus, 1952 -- invalid
  Stylochus tripartitus Hyman, 1953 -- invalid
  Stylochus truncatus (Schmarda, 1859) -- invalid
  Stylochus uniporus Kato, 1944 -- invalid
  Stylochus vesiculatus Jacubowa, 1909 -- valid
  Stylochus vigilax Laidlaw, 1904 -- valid
  Stylochus zanzibaricus Laidlaw, 1903 -- valid
  Stylomecynostomum Hooge and Tyler, 2003 -- valid
  Stylomecynostomum bodegensis Hooge and Tyler, 2003 -- valid
  Styloplanella Findenegg, 1924 -- valid
  Styloplanella strongylostomoides Findenegg, 1924 -- valid
  Styloplanocera Bock, 1913 -- valid
  Styloplanocera fasciata (Schmarda, 1859) -- valid
  Styloplanocera papillifera Bock, 1913 -- invalid
  Stylostomum Lang, 1884 -- valid
  Stylostomum antarcticum Hallez, 1905 -- invalid
  Stylostomum californicum (Heath and McGregor, 1912) -- invalid
  Stylostomum ellipse (Dalyell, 1853) -- valid
  Stylostomum felinum Marcus, 1954 -- valid
  Stylostomum frigidum Bock, 1931 -- valid
  Stylostomum fulvum Giard, 1888 -- valid
  Stylostomum hozawai Kato, 1939 -- invalid
  Stylostomum lentum Heath and McGregor, 1912 -- valid
  Stylostomum maculatum Kato, 1944 -- invalid
  Stylostomum punctatum Hallez, 1905 -- invalid
  Stylostomum roseum (Sars, 1878) -- invalid
  Stylostomum rusticum Giard, 1888 -- valid
  Stylostomum sanguineum Hallez, 1893 -- invalid
  Stylostomum sanjuania Holleman, 1972 -- valid
  Stylostomum spanis Holleman, 2001 -- valid
  Stylostomum variabile Lang, 1884 -- invalid
  Subtelsonia Matjasic, 1958 -- valid
  Subtelsonia perianalis Matjasic, 1958 -- valid
  Subulagera Ehlers, 1974 -- valid
  Subulagera mucronata Ehlers, 1974 -- valid
  Subulagera rubra Martens and Schockaert, 1981 -- valid
  Suomina Marcus, 1945 -- invalid
  Suomina evelinae Marcus, 1945 -- invalid
  Suomina sawayai Marcus, 1945 -- invalid
  Suomina turgida (Zacharias, 1902) -- invalid
  Supramontana Carbayo and Leal-Zanchet, 2003 -- valid
  Supramontana argentina Negrete, Leal-Zanchet and Brusa, 2014 -- valid
  Supramontana irritata Carbayo and Leal-Zanchet, 2003 -- valid
  Susakia Kato, 1934 -- invalid
  Susakia badiomaculata Kato, 1934 -- invalid
  Susakia subviridis (Plehn, 1896) -- invalid
  Suzakia Kato, 1934 -- invalid
  Syatkinella Timoshkin, 2004 -- valid
  Syatkinella snezhanae Timoshkin, 2004 -- valid
  Syltorhynchus Noldt, 1989 -- valid
  Syltorhynchus schockaerti Noldt, 1989 -- valid
  Symsagittifera Kostenko and Mamkaev, 1990 -- valid
  Symsagittifera bifoveolata (Mamkaev, 1971) -- valid
  Symsagittifera corsicae Gschwentner, Baric and Rieger, 2002 -- valid
  Symsagittifera japonica (Kato, 1951) -- valid
  Symsagittifera macnaei (Du Bois-Reymond Marcus, 1957) -- valid
  Symsagittifera nitidae (Yamasu, 1982) -- valid
  Symsagittifera poenicea Kozloff, 1998 -- valid
  Symsagittifera psammophila (Beklemischev, 1957) -- valid
  Symsagittifera roscoffensis (Graff, 1891) -- valid
  Symsagittifera schultzei (Schmidt, 1852) -- valid
  Symsagittifera smaragdina Achatz, Gschwentner and Rieger, 2005 -- valid
  Syncoelidium Wheeler, 1894 -- valid
  Syncoelidium pellucidum Wheeler, 1894 -- valid
  Syndesmis Francois, 1881 -- valid
  Syndesmis aethopharynx Westervelt and Kozloff, 1990 -- valid
  Syndesmis albida Kozloff and Westervelt, 1990 -- valid
  Syndesmis alcalai Komschlies and Vande-Vusse, 1980 -- valid
  Syndesmis antillarum Powers, 1936 -- valid
  Syndesmis atriovillosa (Westblad, 1953) -- valid
  Syndesmis cannoni Jondelius, 1996 -- valid
  Syndesmis clypeasteris (Graff, 1882) -- invalid
  Syndesmis collongistyla (Hertel, Duszynski and Ubelaker, 1990) -- valid
  Syndesmis compacta Komschlies and Vande-Vusse, 1980 -- valid
  Syndesmis dendrastorum Stunkard and Corliss, 1951 -- valid
  Syndesmis echiniacuti Kozloff, 1997 -- valid
  Syndesmis echinorum Francois, 1886 -- valid
  Syndesmis echinorum Silliman, 1881 -- invalid
  Syndesmis evelinae Marcus, 1968 -- valid
  Syndesmis franciscana (Lehman, 1946) -- valid
  Syndesmis glandulosa Hyman, 1960 -- valid
  Syndesmis inconspicua Westervelt and Kozloff, 1992 -- valid
  Syndesmis longicanalis Moens, Martens and Schockaert, 1994 -- valid
  Syndesmis mammilata Komschlies and Vande-Vusse, 1980 -- valid
  Syndesmis neglecta Westervelt and Kozloff, 1992 -- valid
  Syndesmis obhoriensis Beltagi and Mandura, 1991 -- valid
  Syndesmis pallida (Hickman, 1956) -- valid
  Syndesmis patagonica Brogger and Ivanov, 2010 -- valid
  Syndesmis philippinensis Komschlies and Vande-Vusse, 1980 -- valid
  Syndesmis punicea Hickman, 1956 -- valid
  Syndesmis rubida Kozloff and Westervelt, 1990 -- valid
  Syndisyrinx Lehman, 1946 -- invalid
  Syndisyrinx antillarum (Powers, 1936) -- invalid
  Syndisyrinx atriovillosa (Westblad, 1953) -- invalid
  Syndisyrinx collongistyla Hertel, Duszynski and Ubelaker, 1990 -- invalid
  Syndisyrinx evelinae (Marcus, 1968) -- invalid
  Syndisyrinx franciscana Lehman, 1946 -- invalid
  Syndisyrinx pallida (Hickman, 1956) -- invalid
  Syndisyrinx punicea (Hickman, 1956) -- invalid
  Synhaga Czerniavsky, 1881 -- invalid
  Synhaga auriculata Czerniavsky, 1881 -- invalid
  Synsiphonidae Wilhelmi, 1913 -- invalid
  Synsiphonium Hallez, 1911 -- valid
  Synsiphonium anderssoni (Westblad, 1952) -- valid
  Synsiphonium angustum Sluys and Ball, 1989 -- valid
  Synsiphonium ernesti (Hyman, 1958) -- valid
  Synsiphonium liouvilli Hallez, 1911 -- valid
  Synsiphonium stephensoni Palombi, 1938 -- invalid
  Syringoplana Artois, Willems, De Roeck, Jocque and Brendonck, 2005 -- valid
  Syringoplana kolasai Artois, Willems, De Roeck, Jocque and Brendonck, 2005 -- valid
  Tabaota Marcus, 1950 -- valid
  Tabaota curiosa Marcus, 1950 -- valid
  Taborella Sekera, 1912 -- valid
  Taborella hofsteni Sekera, 1912 -- valid
  Taborella petropolitana (Beklemischev, 1923) -- valid
  Taenioplana Hyman, 1944 -- valid
  Taenioplana teredini Hyman, 1944 -- valid
  Taenioplaninae Marcus and Marcus, 1966 -- invalid
  Tajikina Martens and Curini-Galletti, 1994 -- valid
  Tajikina juliae (Tajika, 1982) -- valid
  Tajikina tajikai (Ax and Armonies, 1990) -- valid
  Tamara Uljanin, 1870 -- invalid
  Tamara elongatulum Uljanin, 1870 -- invalid
  Tangaroa Marcus, 1952 -- invalid
  Tangaroa oculatus (Pereyaslawzewa, 1892) -- invalid
  Tangaroa pusa Marcus, 1952 -- invalid
  Tasmanoplana Winsor, 1991 -- valid
  Tasmanoplana balfouri (Graff, 1899) -- valid
  Tasmanoplana comitatis (Dendy, 1915) -- valid
  Tasmanoplana tasmaniana (Darwin, 1844) -- valid
  Tasmanoplana tasmaniana flavicincta (Steel, 1900) -- valid
  Tasmanoplana tasmaniana tasmaniana (Darwin, 1844) -- valid
  Taurida Kostenko, 1989 -- valid
  Taurida fulvomaculata (Ax, 1959) -- valid
  Tauridella Sekera, 1912 -- valid
  Tauridella iphigeniae (Graff, 1905) -- valid
  Taurididae Kostenko, 1989 -- valid
  Telostomum Schmarda, 1859 -- invalid
  Telostomum ferrugineum Schmarda, 1859 -- invalid
  Telostomum mytili Ĝrsted, 1843 -- invalid
  Temnocephala Blanchard, 1849 -- valid
  Temnocephala athertonensis Cannon, 1993 -- invalid
  Temnocephala aurantiaca Haswell, 1900 -- invalid
  Temnocephala axenos Monticelli, 1899 -- valid
  Temnocephala brasilensis Merton, 1922 -- invalid
  Temnocephala brenesi Jennings, 1968 -- valid
  Temnocephala bresslaui Gonzalez, 1949 -- valid
  Temnocephala brevicornis Haswell, 1892 -- valid
  Temnocephala brevicornis brevicornis Haswell, 1892 -- valid
  Temnocephala brevicornis intermedia Merton, 1922 -- valid
  Temnocephala butlerae Cannon, 1993 -- invalid
  Temnocephala caeca Haswell, 1900 -- invalid
  Temnocephala chaeropsis Hett, 1925 -- invalid
  Temnocephala chilensis (Moquin-Tandon, 1846) -- valid
  Temnocephala chilensis Monticelli, 1889 -- invalid
  Temnocephala chilensis Merton, 1912 -- invalid
  Temnocephala cita Hickman, 1967 -- invalid
  Temnocephala colombiensis Garcés, Puerta, Tabares, Lenis and Velásquez, 2013 -- valid
  Temnocephala comes Haswell, 1893 -- invalid
  Temnocephala costarricensis Lamothe, 1974 -- valid
  Temnocephala cuocoloi Volonterio, 2010 -- valid
  Temnocephala curvicirri J. F. R. Amato and S. B. Amato, 2005 -- valid
  Temnocephala cyanoglandula J. F. R. Amato, S. B. Amato and Daudt, 2003 -- valid
  Temnocephala decarloi Moretto, 1978 -- valid
  Temnocephala dendyi Haswell, 1893 -- invalid
  Temnocephala digitata Monticelli, 1902 -- valid
  Temnocephala dionii Ponce de Leon, Beron Vera and Volonterio, 2015 -- valid
  Temnocephala engaei Haswell, 1893 -- invalid
  Temnocephala fasciata Haswell, 1888 -- invalid
  Temnocephala fulva Hickman, 1967 -- valid
  Temnocephala geonoma Williams, 1980 -- invalid
  Temnocephala handschini Baer, 1945 -- invalid
  Temnocephala haswelli Ponce de Leon, 1989 -- valid
  Temnocephala iheringi Haswell, 1893 -- valid
  Temnocephala improcera Cannon, 1993 -- invalid
  Temnocephala jheringi Haswell, 1893 -- invalid
  Temnocephala kingsleyae Damborenea, 1994 -- valid
  Temnocephala lamothei Damborenea and Brusa, 2008 -- valid
  Temnocephala lanei Pereira and Cuoccolo, 1941 -- valid
  Temnocephala longivaginata Seixas, J. F. R. Amato and S. B. Amato, 2011 -- valid
  Temnocephala lutzi Monticelli, 1913 -- valid
  Temnocephala madagascariensis Vayssiere, 1892 -- invalid
  Temnocephala mertoni Volonterio, 2007 -- valid
  Temnocephala mexicana Vayssiere, 1898 -- valid
  Temnocephala microdactyla Monticelli, 1903 -- valid
  Temnocephala minor Haswell, 1888 -- invalid
  Temnocephala minuta Cannon, 1993 -- invalid
  Temnocephala minutocirrus J. F. R. Amato, Seixas and S. B. Amato, 2007 -- valid
  Temnocephala neqae Cannon, 1993 -- invalid
  Temnocephala novaezealandiae Haswell, 1887 -- invalid
  Temnocephala pereirai Volonterio, 2010 -- valid
  Temnocephala peruensis Ibáñez and Jara, 2002 -- valid
  Temnocephala pignalberiae Dioni, 1967 -- valid
  Temnocephala pygmaea Hickman, 1967 -- valid
  Temnocephala quadricornis Haswell, 1887 -- invalid
  Temnocephala queenslandensis Cannon, 1993 -- invalid
  Temnocephala rochensis Ponce de Leon, 1980 -- valid
  Temnocephala rouxi Merton, 1913 -- invalid
  Temnocephala santafesina Dioni, 1967 -- valid
  Temnocephala semperi Weber, 1889 -- invalid
  Temnocephala simulator Haswell, 1924 -- invalid
  Temnocephala sugarei Haswell, 1893 -- valid
  Temnocephala talicei Dioni, 1967 -- valid
  Temnocephala tasmanica Haswell, 1900 -- invalid
  Temnocephala trapeziformis J. F. R. Amato, S. B. Amato and Seixas, 2006 -- valid
  Temnocephala travassosfillioi Pereira and Cuoccolo, 1941 -- valid
  Temnocephala tumbesiana Wacke, 1903 -- invalid
  Temnocephalidae Monticelli, 1899 -- valid
  Temnocephaloidea -- valid
  Temnohaswellia Pereira and Cuoccolo, 1941 -- valid
  Temnohaswellia alpina Sewell, Cannon and Blair, 2006 -- valid
  Temnohaswellia breviumbella Sewell, Cannon and Blair, 2006 -- valid
  Temnohaswellia capricornia Sewell, Cannon and Blair, 2006 -- valid
  Temnohaswellia comes (Haswell, 1893) -- valid
  Temnohaswellia cornu Sewell, Cannon and Blair, 2006 -- valid
  Temnohaswellia crotalum Sewell, Cannon and Blair, 2006 -- valid
  Temnohaswellia munifica Sewell, Cannon and Blair, 2006 -- valid
  Temnohaswellia novaezealandiae (Haswell, 1887) -- valid
  Temnohaswellia pearsoni Sewell, Cannon and Blair, 2006 -- valid
  Temnohaswellia pugna Cannon, 1993 -- valid
  Temnohaswellia simulator (Haswell, 1924) -- valid
  Temnohaswellia subulata Sewell, Cannon and Blair, 2006 -- valid
  Temnohaswellia tetrica Cannon, 1993 -- valid
  Temnohaswellia umbella Sewell, Cannon and Blair, 2006 -- valid
  Temnohaswellia verruca Sewell, Cannon and Blair, 2006 -- valid
  Temnomonticellia Pereira and Cuoccolo, 1941 -- valid
  Temnomonticellia aurantica (Haswell, 1900) -- valid
  Temnomonticellia quadricornis (Haswell, 1887) -- valid
  Temnomonticellia tasmanica (Haswell, 1900) -- valid
  Temnosewellia Damborenea and Cannon, 2001 -- valid
  Temnosewellia acicularis Sewell, Cannon and Blair, 2006 -- valid
  Temnosewellia acirra Cannon and Sewell, 2001 -- valid
  Temnosewellia alba Sewell, Cannon and Blair, 2006 -- valid
  Temnosewellia albata Sewell, Cannon and Blair, 2006 -- valid
  Temnosewellia aphyodes Sewell, Cannon and Blair, 2006 -- valid
  Temnosewellia apiculus Sewell, Cannon and Blair, 2006 -- valid
  Temnosewellia arga Sewell, Cannon and Blair, 2006 -- valid
  Temnosewellia argeta Sewell, Cannon and Blair, 2006 -- valid
  Temnosewellia argilla Sewell, Cannon and Blair, 2006 -- valid
  Temnosewellia aspinosa Sewell, Cannon and Blair, 2006 -- valid
  Temnosewellia aspra Sewell, Cannon and Blair, 2006 -- valid
  Temnosewellia athertonensis (Cannon, 1993) -- valid
  Temnosewellia bacrio Sewell, Cannon and Blair, 2006 -- valid
  Temnosewellia bacrioniculus Sewell, Cannon and Blair, 2006 -- valid
  Temnosewellia batiola Sewell, Cannon and Blair, 2006 -- valid
  Temnosewellia belone Sewell, Cannon and Blair, 2006 -- valid
  Temnosewellia butlerae (Cannon, 1993) -- valid
  Temnosewellia caeca (Haswell, 1900) -- valid
  Temnosewellia caliculus Sewell, Cannon and Blair, 2006 -- valid
  Temnosewellia cestus Sewell, Cannon and Blair, 2006 -- valid
  Temnosewellia chaeropsis (Hett, 1925) -- valid
  Temnosewellia christineae Cannon and Sewell, 2001 -- valid
  Temnosewellia cita (Hickman, 1967) -- valid
  Temnosewellia comythus Sewell, Cannon and Blair, 2006 -- valid
  Temnosewellia coughrani Sewell, Cannon and Blair, 2006 -- valid
  Temnosewellia cypellum Sewell, Cannon and Blair, 2006 -- valid
  Temnosewellia dendyi (Haswell, 1893) -- valid
  Temnosewellia engaei (Haswell, 1893) -- valid
  Temnosewellia fasciata (Haswell, 1888) -- valid
  Temnosewellia fax Sewell, Cannon and Blair, 2006 -- valid
  Temnosewellia flammula Sewell, Cannon and Blair, 2006 -- valid
  Temnosewellia geonoma (Williams, 1980) -- valid
  Temnosewellia gingrina Sewell, Cannon and Blair, 2006 -- valid
  Temnosewellia gracilis Sewell, Cannon and Blair, 2006 -- valid
  Temnosewellia improcera (Cannon, 1993) -- valid
  Temnosewellia keras Sewell, Cannon and Blair, 2006 -- valid
  Temnosewellia maculata Sewell, Cannon and Blair, 2006 -- valid
  Temnosewellia magna Sewell, Cannon and Blair, 2006 -- valid
  Temnosewellia maxima Sewell, Cannon and Blair, 2006 -- valid
  Temnosewellia minima Sewell, Cannon and Blair, 2006 -- valid
  Temnosewellia minor (Haswell, 1888) -- valid
  Temnosewellia minuta (Cannon, 1993) -- valid
  Temnosewellia muscalingulata Sewell, Cannon and Blair, 2006 -- valid
  Temnosewellia neqae (Cannon, 1993) -- valid
  Temnosewellia phantasmella Cannon and Sewell, 2001 -- valid
  Temnosewellia possibilitas Sewell, Cannon and Blair, 2006 -- valid
  Temnosewellia punctata Cannon and Sewell, 2001 -- valid
  Temnosewellia queenslandensis (Cannon, 1993) -- valid
  Temnosewellia rouxi (Merton, 1913) -- valid
  Temnosewellia semperi (Weber, 1889) -- valid
  Temnosewellia semperi chilensis (Merton, 1912) -- invalid
  Temnosewellia unguiculus Sewell, Cannon and Blair, 2006 -- valid
  Temnosewellia vietnamensis Damborenea and Brusa, 2009 -- valid
  Tenerrhynchus Brunet, 1972 -- valid
  Tenerrhynchus magnus Brunet, 1972 -- valid
  Tensopharynx Ehlers, 1972 -- valid
  Tensopharynx inermis Ehlers, 1972 -- valid
  Tergipes Risso, 1818 -- invalid
  Tergipes brocchi Risso, 1818 -- invalid
  Tergipes brochi Risso, 1818 -- invalid
  Tergipes dicquemari Risso, 1818 -- invalid
  Terricola Hallez, 1892 -- invalid
  Tetracelis Ehrenberg, 1831 -- valid
  Tetracelis fontana (Schrank, 1803) -- invalid
  Tetracelis marmorata (Bosc, 1802) -- invalid
  Tetracelis marmorosa (O. F. Müller, 1774) -- valid
  Tetracelis mytili (Ĝrsted, 1843) -- invalid
  Tetracelis viridata Tu, 1939 -- invalid
  Tetracotylus Korotneff, 1912 -- invalid
  Tetracotylus tenax Korotneff, 1912 -- invalid
  Tetraposthia An der Lan, 1936 -- valid
  Tetraposthia Steinböck, 1931 -- invalid
  Tetraposthia colymbetes An der Lan, 1936 -- valid
  Tetraposthia colymbetes Steinböck, 1931 -- invalid
  Thalamoplana Laidlaw, 1904 -- valid
  Thalamoplana australis (Hyman, 1959) -- valid
  Thalamoplana herdmani Laidlaw, 1904 -- valid
  Thalamoplana insularis (Hyman, 1955) -- valid
  Thalassoplanella Luther, 1946 -- valid
  Thalassoplanella collaris Luther, 1946 -- valid
  Thalassoplanina Ax, 1959 -- valid
  Thalassoplanina geniculata (Beklemischev, 1927) -- valid
  Thalassotyphloplanida Willems, Wallberg, Jondelius, Littlewood, Backeljau, Schockaert and Artois, 2006 -- invalid
  Thalassovortex Papi, 1956 -- valid
  Thalassovortex tyrrhenicus Papi, 1956 -- valid
  Thalattoplana Bock, 1925 -- invalid
  Thallagus Marcus, 1951 -- valid
  Thallagus divae Marcus, 1951 -- valid
  Theama Marcus, 1949 -- valid
  Theama evelinae Marcus, 1949 -- valid
  Theama forrestensis (Bulnes and Faubel, 2003) -- valid
  Theama mediterranea Curini-Galletti, Campus and Delogu, 2008 -- valid
  Theama occidua Sopott-Ehlers and Schmidt, 1975 -- valid
  Theamatidae Marcus, 1949 -- valid
  Thinodactylaina Rundell and Leander, 2014 -- invalid
  Thinodactylaina tlaoquiahtensis Rundell and Leander, 2014 -- invalid
  Thylacorhynchus de Beauchamp, 1927 -- valid
  Thylacorhynchus ambronensis Schilke, 1970 -- valid
  Thylacorhynchus arcassonensis de Beauchamp, 1927 -- valid
  Thylacorhynchus caudatus Meixner, 1928 -- valid
  Thylacorhynchus conglobatus Meixner, 1928 -- valid
  Thylacorhynchus filostylis Karling, 1956 -- valid
  Thylacorhynchus longicirrus Noldt, 1989 -- valid
  Thylacorhynchus macrorhynchos Ax, 2008 -- valid
  Thylacorhynchus pyriferus Karling, 1949 -- valid
  Thylacorhynchus vicarus Boaden, 1963 -- valid
  Thysanoplana Plehn, 1896 -- invalid
  Thysanoplana Graff, 1916 -- invalid
  Thysanoplana grisea (Sabussow, 1903) -- invalid
  Thysanoplana indica Plehn, 1896 -- invalid
  Thysanoplana leucocephala (Sabussow, 1903) -- invalid
  Thysanoplana marginata Plehn, 1896 -- invalid
  Thysanoplana papillosa (Korotneff, 1912) -- invalid
  Thysanozoon Grube, 1840 -- valid
  Thysanozoon (Eolidiceros) Schmarda, 1859 -- invalid
  Thysanozoon alagoensis Bahia, Padula, Correia and Sovierzoski, 2015 -- valid
  Thysanozoon alderi Collingwood, 1876 -- invalid
  Thysanozoon allmani Collingwood, 1876 -- invalid
  Thysanozoon aucklandica Cheeseman, 1883 -- invalid
  Thysanozoon aucklandicum Cheeseman, 1883 -- valid
  Thysanozoon aurantiacum (Delle Chiaje, 1822) -- invalid
  Thysanozoon auriantiacum (Delle Chiaje, 1822) -- invalid
  Thysanozoon auropunctatum Kelaart, 1858 -- invalid
  Thysanozoon australe Stimpson, 1855 -- valid
  Thysanozoon boehmigi Stummer-Traunfels, 1895 -- invalid
  Thysanozoon brocchii (Risso, 1818) -- valid
  Thysanozoon brocchii cruciatum (Schmarda, 1859) -- invalid
  Thysanozoon brocchii nigrum Girard, 1851 -- invalid
  Thysanozoon brocchii papillosum Sars, 1878 -- invalid
  Thysanozoon brocchii tentaculatum (Pease, 1860) -- invalid
  Thysanozoon californicum Hyman, 1953 -- valid
  Thysanozoon cruciatum Schmarda, 1859 -- valid
  Thysanozoon dicquemaris (Risso, 1818) -- invalid
  Thysanozoon dicquemaris (Delle Chiaje, 1841) -- invalid
  Thysanozoon diesingii Grube, 1840 -- invalid
  Thysanozoon discoideum Schmarda, 1859 -- valid
  Thysanozoon distinctum Stummer-Traunfels, 1895 -- valid
  Thysanozoon flavotuberculatum Hyman, 1939 -- valid
  Thysanozoon flavum (Delle Chiaje, 1822) -- invalid
  Thysanozoon fockei Diesing, 1850 -- invalid
  Thysanozoon griseum Verrill, 1901 -- valid
  Thysanozoon hawaiiensis Hyman, 1960 -- valid
  Thysanozoon huttoni Kirk, 1882 -- valid
  Thysanozoon indicum (Plehn, 1896) -- invalid
  Thysanozoon japonicum Kato, 1944 -- valid
  Thysanozoon lagidium Marcus, 1949 -- invalid
  Thysanozoon langi Stummer-Traunfels, 1895 -- valid
  Thysanozoon minutum Stummer-Traunfels, 1895 -- valid
  Thysanozoon mirtae Bulnes, Albano, Obenat and Cazzaniga, 2011 -- valid
  Thysanozoon muelleri (Delle Chiaje, 1829) -- invalid
  Thysanozoon mulleri (Delle Chiaje, 1829) -- invalid
  Thysanozoon nigropapillosum (Hyman, 1959) -- valid
  Thysanozoon nigrum Girard, 1851 -- valid
  Thysanozoon obscurum Stummer-Traunfels, 1895 -- invalid
  Thysanozoon ovale Schmarda, 1859 -- invalid
  Thysanozoon panormis (Quatrefage, 1845) -- invalid
  Thysanozoon panormus (Quatrefage, 1845) -- invalid
  Thysanozoon papillosum Grube, 1840 -- valid
  Thysanozoon papillosum Sars, 1878 -- invalid
  Thysanozoon papillosum (Diesing, 1836) -- invalid
  Thysanozoon plehni Laidlaw, 1902 -- invalid
  Thysanozoon raphaeli Bolaños, Quiroga and Litvaitis, 2007 -- valid
  Thysanozoon sandiegense Hyman, 1953 -- invalid
  Thysanozoon sandiegiense Hyman, 1953 -- valid
  Thysanozoon semperi Stummer-Traunfels, 1895 -- invalid
  Thysanozoon skottsbergi Bock, 1923 -- invalid
  Thysanozoon skottsburgi Bock, 1923 -- valid
  Thysanozoon tentaculatum (Pease, 1860) -- valid
  Thysanozoon tuberculatum (Delle Chiaje, 1828) -- invalid
  Thysanozoon verrucosum Grube, 1867 -- valid
  Thysanozoon violaceum (Delle Chiaje, 1822) -- invalid
  Thysanozoon vulgare Palombi, 1939 -- valid
  Thysanozoon vulgaris Palombi, 1939 -- invalid
  Tiddles Marcus, 1963 -- valid
  Tiddles evelinae Marcus, 1963 -- valid
  Timyama E. M. Froehlich, 1978 -- valid
  Timyama juliae E. M. Froehlich, 1978 -- valid
  Togarma Marcus, 1949 -- valid
  Togarma evelinae Marcus, 1949 -- valid
  Toia Marcus, 1952 -- valid
  Toia calceformis Brunet, 1973 -- valid
  Toia ycia Marcus, 1952 -- valid
  Tokiphallus Faubel, 1983 -- valid
  Tokiphallus bartschi (Kaburaki, 1923) -- valid
  Torgea Jondelius, 1997 -- valid
  Torgea karlingi Jondelius, 1997 -- valid
  Torgea phukettensis Norén and Jondelius, 2004 -- valid
  Torgeidae Jondelius, 1997 -- invalid
  Torkarlingia Mack-Fira, 1971 -- invalid
  Torkarlingia euxinica Mack-Fira, 1971 -- invalid
  Trachyplana Stimpson, 1857 -- valid
  Trachyplana tuberculosa Stimpson, 1857 -- valid
  Trapichorhynchus Marcus, 1949 -- valid
  Trapichorhynchus tapes Marcus, 1949 -- valid
  Traunfelsia Laidlaw, 1906 -- valid
  Traunfelsia elongata Laidlaw, 1906 -- valid
  Trepaxonemata Ehlers, 1984 -- invalid
  Triadomma Marcus, 1947 -- valid
  Triadomma curvum Marcus, 1949 -- valid
  Triadomma evelinae Marcus, 1947 -- valid
  Triaustrorhynchus Willems, Schockaert and Artois, 2006 -- valid
  Triaustrorhynchus armatus Willems, Schockaert and Artois, 2006 -- valid
  Tricelis Quatrefage, 1845 -- valid
  Tricelis fasciatus Quatrefage, 1845 -- valid
  Tricelis obtusa (Schultze, 1851) -- invalid
  Tricelis quadripunctata Diesing, 1862 -- invalid
  Tricladida Lang, 1884 -- invalid -- triclads
  Trigonoporinae Laidlaw, 1903 -- valid
  Trigonoporus Lang, 1884 -- valid
  Trigonoporus aegypticus (Melouk, 1940) -- valid
  Trigonoporus anomala (Laidlaw, 1903) -- invalid
  Trigonoporus cephalophthalmus Lang, 1884 -- valid
  Trigonoporus dendriticus Verrill, 1892 -- valid
  Trigonoporus diversus (Yeri and Kaburaki, 1918) -- invalid
  Trigonoporus eximius (Kato, 1937) -- valid
  Trigonoporus folium (Verrill, 1873) -- valid
  Trigonoporus microps Verrill, 1901 -- invalid
  Trigonoporus mirabilis (Kato, 1938) -- valid
  Trigonostomidae Graff, 1905 -- valid
  Trigonostominae Graff, 1905 -- valid
  Trigonostomum Schmidt, 1852 -- valid
  Trigonostomum armatum (Jensen, 1878) -- valid
  Trigonostomum australis Willems, Artois, Vermin and Schockaert, 2004 -- valid
  Trigonostomum breitfussi (Graff, 1905) -- valid
  Trigonostomum brunchorsti Graff, 1905 -- invalid
  Trigonostomum coronatum (Graff, 1882) -- valid
  Trigonostomum denhartogi (Karling, 1978) -- valid
  Trigonostomum divae Marcus, 1948 -- invalid
  Trigonostomum euryalus Schmidt, 1852 -- invalid
  Trigonostomum franki Willems, Artois, Vermin and Schockaert, 2004 -- valid
  Trigonostomum galapagoensis Willems, Artois, Vermin and Schockaert, 2004 -- valid
  Trigonostomum intermedium (Attems, 1897) -- invalid
  Trigonostomum intermedium Graff, 1911 -- invalid
  Trigonostomum lilliei (Graff, 1911) -- valid
  Trigonostomum marki Graff, 1911 -- invalid
  Trigonostomum messoplanoides Artois, Vermin and Schockaert, 2000 -- valid
  Trigonostomum mirabile (Pereyaslawzewa, 1892) -- valid
  Trigonostomum nataschae Willems, Artois, Vermin and Schockaert, 2004 -- valid
  Trigonostomum neocomensis (Fuhrmann, 1904) -- invalid
  Trigonostomum penicillatum (Schmidt, 1857) -- valid
  Trigonostomum piriforme Pereyaslawzewa, 1892 -- invalid
  Trigonostomum prytherchi Kepner, Ferguson and Stirewalt, 1941 -- valid
  Trigonostomum quadrifolium Riedl, 1954 -- invalid
  Trigonostomum setigerum Schmidt, 1852 -- valid
  Trigonostomum setigerum album Graff, 1905 -- invalid
  Trigonostomum setigerum lunulatum Graff, 1905 -- invalid
  Trigonostomum setigerum setigerum Schmidt, 1852 -- invalid
  Trigonostomum spinigerum Willems, Artois, Vermin and Schockaert, 2004 -- valid
  Trigonostomum tori Willems, Artois, Vermin and Schockaert, 2004 -- valid
  Trigonostomum vanmecheleni Artois, Schockaert, Beenaerts and Reygel, 2013 -- valid
  Trigonostomum venenosum (Uljanin, 1870) -- valid
  Trigonostomum watsoni Willems, Artois, Vermin and Schockaert, 2004 -- valid
  Triloborhynchus Bashiruddin and Karling, 1970 -- invalid
  Triloborhynchus astropectinis Bashiruddin and Karling, 1970 -- invalid
  Triloborhynchus psilastericola Jespersen and Luetzen, 1972 -- invalid
  Tringorhynchus Karling -- invalid
  Triplana Faubel, 1983 -- valid
  Triplana viridis (Freeman, 1933) -- valid
  Triporoplana Ax, 1956 -- valid
  Triporoplana synsiphonioides Ax, 1956 -- valid
  Tripylocelis Haswell, 1907 -- valid
  Tripylocelis typica Haswell, 1907 -- valid
  Tripyloplana Faubel, 1983 -- valid
  Tripyloplana tripyla (Hyman, 1953) -- valid
  Tripyloplana virgae (Sopott-Ehlers and Schmidt, 1975) -- valid
  Trisaccopharynx Karling, 1940 -- valid
  Trisaccopharynx armatus Riedl, 1956 -- invalid
  Trisaccopharynx pusa (Marcus, 1952) -- valid
  Trisaccopharynx roscoffensis Ehlers, 1980 -- valid
  Trisaccopharynx spiculatus Ehlers, 1972 -- valid
  Trisaccopharynx westbladi Karling, 1940 -- valid
  Troglocaridicola Matjasic, 1958 -- valid
  Troglocaridicola (Jeanbaeria) Matjasic, 1990 -- valid
  Troglocaridicola (Troglocaridicola) Matjasic, 1990 -- valid
  Troglocaridicola capreolaria Matjasic, 1958 -- valid
  Troglocaridicola cervaria Matjasic, 1958 -- valid
  Troglocaridicola cestoidaria Matjasic, 1958 -- valid
  Troglocaridicola istriana Matjasic, 1958 -- valid
  Troglocaridicola kirkensis Matjasic, 1958 -- valid
  Troglocaridicola longipenis Matjasic, 1990 -- valid
  Troglocaridicola maxima Matjasic, 1958 -- valid
  Troglocaridicola mrazeki Joffe and Djanashvili, 1981 -- valid
  Troglocaridicola spelaeocaridicola Matjasic, 1958 -- valid
  Troglocaridicola vilkae Matjasic, 1990 -- valid
  Tryssosoma Ball, 1977 -- valid
  Tryssosoma jennyae Ball, 1977 -- valid
  Tuilica Marcus, 1951 -- invalid
  Tuilica evelinae Marcus, 1951 -- invalid
  Turbella Ehrenberg, 1831 -- valid
  Turbella andicola (Schmarda, 1859) -- invalid
  Turbella appendiculata (Fabricius, 1826) -- invalid
  Turbella assimilis (Fabricius, 1826) -- invalid
  Turbella bacillifera Diesing, 1862 -- invalid
  Turbella baltica (Schultze, 1851) -- invalid
  Turbella bistrigata (Diesing, 1850) -- invalid
  Turbella caudatus (Schmarda, 1859) -- invalid
  Turbella conus (Schmarda, 1859) -- invalid
  Turbella craci (Schmidt, 1857) -- invalid
  Turbella crenulata (Schmarda, 1859) -- invalid
  Turbella cyathus (Schmidt, 1858) -- invalid
  Turbella diglena (Schmarda, 1859) -- invalid
  Turbella ehrenbergi (Focke, 1836) -- invalid
  Turbella fusiformis (A. L. Dugès, 1830) -- invalid
  Turbella galiciana (Schmidt, 1858) -- invalid
  Turbella gibba (Fabricius, 1826) -- valid
  Turbella helluo (O. F. Müller, 1773) -- invalid
  Turbella hystrix Diesing, 1862 -- invalid
  Turbella inerme Hallez, 1879 -- invalid
  Turbella klostermanni Graff, 1874 -- invalid
  Turbella lanceolatum (A. L. Dugès, 1828) -- invalid
  Turbella lenticulata (Schmidt, 1852) -- invalid
  Turbella leucocelis (Schmarda, 1859) -- invalid
  Turbella lingua (Schmidt, 1848) -- invalid
  Turbella lunulata Ehrenberg, 1831 -- invalid
  Turbella metopoglena (Schmarda, 1859) -- invalid
  Turbella nigrovenosa Diesing, 1862 -- invalid
  Turbella notops Diesing, 1862 -- invalid
  Turbella ovoideum (Schmidt, 1852) -- invalid
  Turbella personata (Schmidt, 1848) -- invalid
  Turbella pisciculus Diesing, 1862 -- invalid
  Turbella planaria (Ehrenberg, 1831) -- valid
  Turbella platurus (A. L. Dugès, 1828) -- invalid
  Turbella platyura A. L. Dugès, 1828 -- invalid
  Turbella producta (Schmidt, 1848) -- invalid
  Turbella proteus (Ehrenberg, 1831) -- invalid
  Turbella pusilla (Schmidt, 1848) -- invalid
  Turbella radiata (O. F. Müller, 1773) -- invalid
  Turbella reticulata (Schmidt, 1852) -- invalid
  Turbella rostrata (O. F. Müller, 1774) -- invalid
  Turbella schmidtiana (Schultze, 1851) -- invalid
  Turbella scoparia (Schmidt, 1858) -- invalid
  Turbella selenops (A. L. Dugès, 1830) -- invalid
  Turbella siphonophorum (Schmidt, 1852) -- invalid
  Turbella solea (Schmidt, 1857) -- invalid
  Turbella sphaeropharynx (Schmarda, 1859) -- invalid
  Turbella squalus (A. L. Dugès, 1828) -- invalid
  Turbella stagni (Dalyell, 1853) -- invalid
  Turbella strigatum Oersted, 1844 -- invalid
  Turbella tetragona (O. F. Müller, 1774) -- invalid
  Turbella trigonoglena (Schmarda, 1859) -- invalid
  Turbella truncata (Schmarda, 1859) -- invalid
  Turbella truncula (Schmidt, 1858) -- invalid
  Turbella unipunctatum (Ĝrsted, 1843) -- invalid
  Turbella viridus (Schultze, 1851) -- invalid
  Turbella wandae (Schmidt, 1858) -- invalid
  Tvaerminnea Luther, 1943 -- valid
  Tvaerminnea direceptacula Ehlers, Mueller and Franke, 1994 -- valid
  Tvaerminnea karlingi Luther, 1943 -- valid
  Tvaerminnea karlingi karlingi Luther, 1943 -- valid
  Tvaerminnea karlingi pacifica Karling, 1986 -- valid
  Typhlocolax Stimpson, 1857 -- invalid
  Typhlocolax acuminata Stimpson, 1857 -- invalid
  Typhlocolax acuta (Girard, 1854) -- invalid
  Typhlocolax marina (Ĝrsted, 1844) -- invalid
  Typhlolepta Ĝrsted, 1843 -- valid
  Typhlolepta acuminata (Stimpson, 1857) -- valid
  Typhlolepta acuta Girard, 1854 -- valid
  Typhlolepta bilobata (Leuckart, 1828) -- valid
  Typhlolepta byerleyana Collingwood, 1876 -- invalid
  Typhlolepta coeca Ĝrsted, 1844 -- invalid
  Typhlolepta extensa Le Conte, 1851 -- valid
  Typhlolepta marina Ĝrsted, 1843 -- invalid
  Typhlolepta opaca Schmarda, 1859 -- valid
  Typhlolepta retusa (Vivianini, 1805) -- valid
  Typhlolepta rubrocincta (Grube, 1840) -- invalid
  Typhlolepta stagni (Dalyell, 1853) -- invalid
  Typhlolepta stimpsoni Diesing, 1862 -- valid
  Typhlomicrostomum Diesing, 1862 -- invalid
  Typhlomicrostomum coerulescens (Schmarda, 1859) -- invalid
  Typhloplana Ehrenberg, 1831 -- valid
  Typhloplana bresslaui (Sekera, 1906) -- invalid
  Typhloplana ceylanica (Schmarda, 1859) -- invalid
  Typhloplana coeca (A. L. Dugès, 1830) -- invalid
  Typhloplana elongatum (Schmarda, 1859) -- invalid
  Typhloplana fuliginosa (Leidy, 1851) -- invalid
  Typhloplana gracilis Schmarda, 1859 -- invalid
  Typhloplana halleziana (Vejdovsky, 1880) -- invalid
  Typhloplana hirudo (Schmidt, 1858) -- invalid
  Typhloplana lapponicum (Schmidt, 1852) -- invalid
  Typhloplana marina Ĝrsted, 1843 -- invalid
  Typhloplana minima (Fuhrmann, 1894) -- valid
  Typhloplana nigra Houghton, 1867 -- invalid
  Typhloplana pallida (Schmidt, 1848) -- invalid
  Typhloplana parasita (Schneider, 1858) -- invalid
  Typhloplana pellucida (Schultze, 1851) -- invalid
  Typhloplana polyastrum (A. L. Dugès, 1828) -- invalid
  Typhloplana pratense Schultze, 1851 -- invalid
  Typhloplana schultzeana Diesing, 1862 -- invalid
  Typhloplana sulphurea Schmidt, 1848 -- invalid
  Typhloplana variabilis Ĝrsted, 1843 -- invalid
  Typhloplana viridata (Abildgaard, 1789) -- valid
  Typhloplana viridata ovipara Mahan, 1956 -- valid
  Typhloplana viridata viridata (Abildgaard, 1789) -- valid
  Typhloplana viridis Du Plessis, 1877 -- invalid
  Typhloplana vitellata Dutta, 1932 -- valid
  Typhloplanella Sekera, 1912 -- valid
  Typhloplanella arctica (Nasonov, 1923) -- valid
  Typhloplanella bresslaui (Sekera, 1906) -- valid
  Typhloplanella halleziana (Vejdovsky, 1880) -- valid
  Typhloplanella hirudo (Schmidt, 1858) -- invalid
  Typhloplanella inermis (Reisinger, 1924) -- invalid
  Typhloplanella opaca Nasonov, 1923 -- valid
  Typhloplanella paraproxenetes (Reisinger, 1924) -- invalid
  Typhloplanella pinguis (Reisinger, 1924) -- invalid
  Typhloplanella septentrionalis (Nasonov, 1924) -- valid
  Typhloplanella sexmaculata Nasonov, 1923 -- valid
  Typhloplanella vejdovskyi (Jaworowski, 1895) -- invalid
  Typhloplanidae Luther, 1904 -- valid
  Typhloplanidarum Steinböck, 1948 -- invalid
  Typhloplaninae Luther, 1904 -- valid
  Typhloplanoida Bresslau, 1928 -- invalid
  Typhlopolycystidinae Evdonin, 1977 -- valid
  Typhlopolycystis Karling, 1956 -- valid
  Typhlopolycystis coeca Karling, 1956 -- valid
  Typhlopolycystis coomansi Schockaert and Karling, 1975 -- valid
  Typhlopolycystis limicola Schilke, 1970 -- invalid
  Typhlopolycystis mediterranea Brunet, 1965 -- valid
  Typhlopolycystis rubra Noldt and Reise, 1987 -- valid
  Typhlopolycystis schockaerti Karling, 1978 -- valid
  Typhlorhynchus Laidlaw, 1902 -- valid
  Typhlorhynchus nanus Laidlaw, 1902 -- valid
  Typhlorhynchus syltensis Noldt, 1985 -- valid
  Tyrrheniella Riedl, 1959 -- valid
  Tyrrheniella sigillata Riedl, 1959 -- valid
  Tyrrheniellidae Riedl, 1959 -- valid
  Tytthosoceros Newman and Cannon, 1996 -- valid
  Tytthosoceros inca Baeza, Veliz, Pardo et al., 1997 -- valid
  Tytthosoceros lizardensis Newman and Cannon, 1996 -- valid
  Tytthosoceros nocturnus Newman and Cannon, 1996 -- valid
  Ulianinia Levinsen, 1879 -- valid
  Ulianinia contractilis (Meixner, 1938) -- valid
  Ulianinia mollissima Levinsen, 1879 -- valid
  Ulianinia westbladi Karling, 1963 -- valid
  Ulianiniidae Levinsen, 1879 -- valid
  Umagilla Wahl, 1906 -- valid
  Umagilla elegans Bock, 1913 -- invalid
  Umagilla forskalensis Wahl, 1906 -- valid
  Umagilla karlingi Cannon, 1987 -- valid
  Umagilla leptosynaptae Ozaki and Okamoto, 1944 -- valid
  Umagilla pacifica Cannon, 1987 -- valid
  Umagilla setonaikaiensis Ozaki and Okamoto, 1944 -- valid
  Umagillidae Wahl, 1910 -- valid
  Umagillinae Wahl, 1910 -- valid
  Unantra Faubel, 1976 -- valid
  Unantra polyvacuola Faubel, 1976 -- valid
  Uncinorhynchus Karling, 1947 -- valid
  Uncinorhynchus flavidus Karling, 1947 -- valid
  Uncinorhynchus hamatus Brunet, 1973 -- valid
  Uncinorhynchus karlingi Kolasa, 1977 -- valid
  Uncinorhynchus pacificus Karling, 1989 -- valid
  Uncinorhynchus proporus Brunet, 1973 -- valid
  Uncinorhynchus vorago Willems, Sandberg and Jondelius, 2007 -- valid
  Uncinorhynchus westbladi Karling, 1952 -- valid
  Undicola Rundell and Leander, 2014 -- invalid
  Undicola tofinoensis Rundell and Leander, 2014 -- invalid
  Unguiphora Sopott-Ehlers, 1985 -- invalid
  Urastoma Dörler, 1900 -- valid
  Urastoma cyprinae (Graff, 1882) -- valid
  Urastoma evelinae Marcus, 1951 -- invalid
  Urastoma fausseki Dörler, 1900 -- invalid
  Urastomidae Marcus, 1951 -- valid
  Utelga Marcus, 1949 -- valid
  Utelga acerosa Brunet, 1972 -- invalid
  Utelga aculeata Ax, 1959 -- invalid
  Utelga bocki Karling, 1954 -- invalid
  Utelga carolinensis Ax, 2008 -- valid
  Utelga chelifera (Karling, 1954) -- invalid
  Utelga deina Marcus, 1949 -- valid
  Utelga heinckei (Attems, 1897) -- valid
  Utelga monodon Ax, 2008 -- valid
  Utelga montereyensis Karling, 1980 -- valid
  Utelga possjetica Evdonin, 1977 -- valid
  Utelga pseudoheinckei Karling, 1980 -- valid
  Utelga relicta (Beklemischev, 1927) -- invalid
  Utelga scotica Karling, 1954 -- invalid
  Utelga similis Brunet, 1972 -- invalid
  Utelga simplicodentata Schwank, 1980 -- valid
  Utelga sophiae (Graff, 1905) -- invalid
  Utelga spinosa (Beklemischev, 1927) -- valid
  Utelga uncinata (Karling, 1978) -- invalid
  Utelga variodentata Karling, Mack-Fira and Dörjes, 1972 -- invalid
  Utelga vesicatula Brunet, 1972 -- valid
  Uteriporidae Böhmig, 1906 -- valid
  Uteriporinae Böhmig, 1906 -- valid
  Uteriporus Bergendal, 1890 -- valid
  Uteriporus pacificus Sluys, 1989 -- valid
  Uteriporus vulgaris Bergendal, 1890 -- valid
  Utsurus Marcus, 1954 -- invalid
  Utsurus camarguensis Brunet, 1965 -- invalid
  Utsurus evelinae Marcus, 1954 -- invalid
  Vaillantiella Luther, 1955 -- valid
  Vaillantiella algerica Luther, 1955 -- valid
  Vaillantiella caribumba Marcus and Du Bois-Reymond Marcus, 1957 -- valid
  Vannuccia Marcus, 1948 -- valid
  Vannuccia campana Ehlers and Ehlers, 1980 -- valid
  Vannuccia hastata Ax and Ax, 1974 -- invalid
  Vannuccia hirutai Tajika, 1981 -- invalid
  Vannuccia martae Marcus, 1948 -- valid
  Vannuccia rotundouncinata Ax and Sopott-Ehlers, 1979 -- valid
  Vannuccia talea Marcus, 1954 -- valid
  Vannuccia tripapillosa Tajika, 1977 -- valid
  Vannuccia tripapillosa americana Ax and Sopott-Ehlers, 1979 -- valid
  Vannuccia tripapillosa tripapillosa Tajika, 1977 -- valid
  Vannuccia umbilica Sopott, 1972 -- invalid
  Varsoviella Gieysztor and Wiszniewski, 1947 -- valid
  Varsoviella kozminskii Gieysztor and Wiszniewski, 1947 -- valid
  Vatapa Marcus, 1948 -- valid
  Vatapa gabriellae Marcus, 1948 -- valid
  Vatapa tumidosa Sluys and Ball, 1989 -- valid
  Vauclusia Willems, Artois, Vermin, Backeljau and Schockaert, 2004 -- valid
  Vauclusia conica Willems, Artois, Vermin, Backeljau and Schockaert, 2004 -- valid
  Vauclusia multistriata Van Steenkiste, Volonterio, Schockaert and Artois, 2008 -- valid
  Vejdovskya Graff, 1905 -- valid
  Vejdovskya adriatica (Dörler, 1900) -- valid
  Vejdovskya halileimonia Ax, 1960 -- valid
  Vejdovskya helictos Ax, 1956 -- valid
  Vejdovskya ignava Ax, 1951 -- valid
  Vejdovskya mesostyla Ax, 1954 -- valid
  Vejdovskya mesostyla hemicycla Ax, 1960 -- valid
  Vejdovskya mesostyla mesostyla Ax, 1954 -- valid
  Vejdovskya murmanica (Graff, 1905) -- valid
  Vejdovskya natans Ax, 1951 -- invalid
  Vejdovskya parapellucida Ax, 1997 -- valid
  Vejdovskya pellucida (Schultze, 1851) -- valid
  Vejdovskya simrisiensis Karling, 1957 -- valid
  Vejdovskya suecica Luther, 1948 -- invalid
  Vejdovskya suslica Marcus, 1951 -- invalid
  Vejdovskya ussuriensis Nasonov, 1932 -- invalid
  Ventrociliella Kolasa, 1977 -- valid
  Ventrociliella romanae Kolasa, 1977 -- valid
  Vera Uljanin, 1870 -- invalid
  Vera taurica Uljanin, 1870 -- invalid
  Vermipharyngiella Porfirieva and Timoshkin, 2013 -- valid
  Vermipharyngiella unica Porfirieva and Timoshkin, 2013 -- valid
  Voritcerotidae Reisinger, 1924 -- invalid
  Vortex Ehrenberg, 1831 -- valid
  Vortex adriatica (Dörler, 1900) -- invalid
  Vortex affinis Jensen, 1878 -- invalid
  Vortex angulatus Jensen, 1878 -- invalid
  Vortex armiger Schmidt, 1861 -- invalid
  Vortex balticus Schultze, 1851 -- invalid
  Vortex benedeni Schmidt, 1852 -- invalid
  Vortex bilineata Woodworth, 1896 -- invalid
  Vortex blodgetti Silliman, 1884 -- invalid
  Vortex candida Girard, 1850 -- invalid
  Vortex capitata Ĝrsted, 1844 -- invalid
  Vortex caucasicus Plotnikow, 1906 -- invalid
  Vortex caudatus Schmarda, 1859 -- invalid
  Vortex cavicolens Packard, 1883 -- invalid
  Vortex cavifrons Jensen, 1878 -- invalid
  Vortex chlorosticus (Schmidt, 1857) -- invalid
  Vortex coecus Ĝrsted, 1844 -- invalid
  Vortex complicatus Fuhrmann, 1914 -- invalid
  Vortex conus Schmarda, 1859 -- invalid
  Vortex coronarius Schmidt, 1858 -- valid
  Vortex coronarius Zykoff, 1902 -- invalid
  Vortex crenulatum (Schmarda, 1859) -- invalid
  Vortex cruciatus (Fabricius, 1826) -- invalid
  Vortex cuspidatus Schmidt, 1861 -- invalid
  Vortex cuspidatus quinquedentatus Wassilieff, 1891 -- invalid
  Vortex cuspidatus sexdentatus Sekera, 1906 -- invalid
  Vortex denticulatus (Schmarda, 1859) -- invalid
  Vortex dubium (Ĝrsted, 1845) -- invalid
  Vortex emarginatum Diesing, 1862 -- invalid
  Vortex erivanicus Plotnikow, 1906 -- invalid
  Vortex ferrugineus Schmarda, 1854 -- invalid
  Vortex fingalianum (Claparède, 1861) -- invalid
  Vortex fingalianus (Claparède, 1861) -- invalid
  Vortex fontana Diesing, 1862 -- invalid
  Vortex funebris Uljanin, 1870 -- invalid
  Vortex fusca Fuhrmann, 1894 -- invalid
  Vortex girardi Schmidt, 1857 -- invalid
  Vortex graffi Hallez, 1878 -- invalid
  Vortex hallezi Graff, 1882 -- invalid
  Vortex helluo (O. F. Müller, 1773) -- invalid
  Vortex hispidus Claparède, 1863 -- valid
  Vortex incertus Böhmig, 1902 -- invalid
  Vortex infundibuliformis Fuhrmann, 1894 -- invalid
  Vortex intermedius Du Plessis, 1879 -- invalid
  Vortex kessleri Plotnikow, 1906 -- invalid
  Vortex kharkowiensis Markow, 1904 -- invalid
  Vortex lanceolatus Graff, 1882 -- invalid
  Vortex lemani Forel and Du Plessis, 1874 -- invalid
  Vortex marginatus (Leidy, 1847) -- invalid
  Vortex marmoratus (Bosc, 1802) -- invalid
  Vortex microphthalma Vejdovsky, 1895 -- invalid
  Vortex millportensis Graff, 1882 -- invalid
  Vortex mytili (Ĝrsted, 1843) -- valid
  Vortex obscurus Plotnikow, 1905 -- invalid
  Vortex ornatus Uljanin, 1870 -- invalid
  Vortex pallidus (Beneden, 1860) -- invalid
  Vortex paucispinosa Sekera, 1888 -- invalid
  Vortex pellucidus Schultze, 1851 -- invalid
  Vortex penicillatus Schmidt, 1857 -- invalid
  Vortex penicillus Braun, 1885 -- invalid
  Vortex pictus Schmidt, 1848 -- invalid
  Vortex pinguis Silliman, 1884 -- invalid
  Vortex punctatus (Levinsen, 1879) -- invalid
  Vortex quadridens Böhmig, 1898 -- invalid
  Vortex quadridensoides Fuhrmann, 1914 -- invalid
  Vortex quadrioculatum Leuckart, 1847 -- invalid
  Vortex quadrioculatus Vejdovsky, 1895 -- invalid
  Vortex reticulatus Schmidt, 1852 -- invalid
  Vortex rhombiger Plotnikow, 1905 -- invalid
  Vortex ruber Fuhrmann, 1894 -- invalid
  Vortex sagitta Uljanin, 1870 -- invalid
  Vortex schmidtii Graff, 1882 -- invalid
  Vortex scoparius Schmidt, 1858 -- invalid
  Vortex selenops Graff, 1882 -- invalid
  Vortex semperi Graff, 1882 -- valid
  Vortex sexdentatus Graff, 1882 -- valid
  Vortex sexdentatus quinquedentata Wassilieff, 1891 -- invalid
  Vortex sibiricus Plotnikow, 1905 -- invalid
  Vortex sphaeropharynx Schmarda, 1859 -- invalid
  Vortex striatus Plotnikow, 1905 -- invalid
  Vortex transilvanus Paradi, 1882 -- invalid
  Vortex trichaeta Fuhrmann, 1894 -- invalid
  Vortex trigonoglena Schmarda, 1859 -- invalid
  Vortex triquetrus Fuhrmann, 1894 -- invalid
  Vortex truncata (Abildgaard, 1789) -- invalid
  Vortex variegatus (Dalyell, 1853) -- invalid
  Vortex virgulifer Plotnikow, 1906 -- invalid
  Vortex viridis Schultze, 1851 -- invalid
  Vortex vittata Frey and Leuckart, 1847 -- invalid
  Vortex warreni Girard, 1850 -- invalid
  Vorticeros Schmidt, 1852 -- valid
  Vorticeros auriculatum (O. F. Müller, 1784) -- valid
  Vorticeros cyrtum Marcus, 1947 -- valid
  Vorticeros cyrtum amoma Marcus, 1947 -- valid
  Vorticeros cyrtum cyrtum Marcus, 1947 -- valid
  Vorticeros dahli Marcus, 1954 -- valid
  Vorticeros ijima Tozawa, 1918 -- valid
  Vorticeros lobatum Tozawa, 1918 -- invalid
  Vorticeros luteum Hallez, 1879 -- valid
  Vorticeros praedatorium Kozloff and Westervelt, 2001 -- valid
  Vorticeros pulchellum Schmidt, 1852 -- valid
  Vorticeros rudis Riedl, 1959 -- valid
  Vorticeros schmidtii Hallez, 1879 -- invalid
  Vorticerotinae Reisinger, 1924 -- invalid
  Vranjella An der Lan, 1939 -- valid
  Vranjella gonophthalma An der Lan, 1939 -- valid
  Wadaella Timoshkin, 2004 -- valid
  Wadaella podkorytovae Timoshkin, 2004 -- valid
  Wahlia Westblad, 1930 -- valid
  Wahlia macrostylifera Westblad, 1930 -- valid
  Wahlia pulchella Kozloff and Shinn, 1987 -- valid
  Wahlia stichopi Cannon, 1982 -- valid
  Wahlia westbladi Jondelius, 1996 -- valid
  Waminoa Winsor, 1990 -- valid
  Waminoa brickneri Ogunlana, Hooge, Tekle, Benayahu, Barneah and Tyler, 2005 -- valid
  Waminoa litus Winsor, 1990 -- valid
  Weissius Sluys, 2007 -- valid
  Weissius capaciductus Sluys, 2007 -- valid
  Weldonia Martin, 1908 -- invalid
  Weldonia paraguayensis Martin, 1908 -- invalid
  Westbladiella Luther, 1943 -- valid
  Westbladiella angulifera Riedl, 1954 -- valid
  Westbladiella falcifera Riedl, 1954 -- valid
  Westbladiella obliquepharynx Luther, 1943 -- valid
  Westbladiella tubifera Riedl, 1956 -- valid
  Woodsholia Graff, 1911 -- invalid
  Woodsholia lilliei Graff, 1911 -- invalid
  Woodworthia Laidlaw, 1904 -- invalid
  Woodworthia atlantica Bock, 1913 -- invalid
  Woodworthia insignis Laidlaw, 1904 -- invalid
  Wulguru Winsor, 1988 -- valid
  Wulguru cuspidata Winsor, 1988 -- valid
  Wydula Marcus, 1954 -- valid
  Wydula avia Marcus, 1954 -- valid
  Wydula simplex Ehlers and Ehlers, 1981 -- valid
  Xarapoa C. G. Froehlich, 1955 -- invalid
  Xenacoelomorpha Philippe, Brinkmann, Copley, Moroz, Nakano, Poustka, Wallberg, Peterson and Telford, 2011 -- valid
  Xenocicerina Karling, 1956 -- valid
  Xenocicerina gracilis Karling, 1956 -- valid
  Xenometra Ozaki, 1932 -- invalid
  Xenometra arbora Ozaki, 1932 -- invalid
  Xenoprorhynchus Reisinger, 1968 -- valid
  Xenoprorhynchus brasiliensis Reisinger, 1968 -- valid
  Xenoprorhynchus steinboecki Reisinger, 1968 -- valid
  Xenotoplana Ax, Weidemann and Ehlers, 1978 -- valid
  Xenotoplana acus Ax, Weidemann and Ehlers, 1978 -- valid
  Xenotoplana tridentis Ax, 1984 -- valid
  Xenotoplana tyrrhenica Ax, Weidemann and Ehlers, 1978 -- valid
  Xenoturbella Westblad, 1949 -- valid
  Xenoturbella bocki (Westblad, 1949) -- valid
  Xenoturbella churro Rouse, Wilson, Carvajal and Vrijenhoek, 2016 -- valid
  Xenoturbella hollandorum Rouse, Wilson, Carvajal and Vrijenhoek, 2016 -- valid
  Xenoturbella monstrosa Rouse, Wilson, Carvajal and Vrijenhoek, 2016 -- valid
  Xenoturbella profunda Rouse, Wilson, Carvajal and Vrijenhoek, 2016 -- valid
  Xenoturbella westbladi Reisinger, 1960 -- invalid
  Xenoturbellida Bourlat et al., 2006 -- valid
  Xenoturbellidae Westblad, 1949 -- valid
  Xerapoa C. G. Froehlich, 1955 -- valid
  Xerapoa hystrix C. G. Froehlich, 1955 -- valid
  Xerapoa pseudorhynchodemus (Riester, 1938) -- invalid
  Xerapoa trina (Marcus, 1951) -- valid
  Xerapoa una C. G. Froehlich, 1955 -- valid
  Yagua Du Bois-Reymond Marcus, 1958 -- valid
  Yagua lutheri Du Bois-Reymond Marcus, 1958 -- valid
  Yaquinaia Schockaert and Karling, 1970 -- valid
  Yaquinaia microrhynchus Schockaert and Karling, 1970 -- valid
  Yorknia Schockaert, Curini-Galletti, De Ridder, Volonterio and Artois, 2009 -- valid
  Yorknia aprostatica Schockaert, Curini-Galletti, De Ridder, Volonterio and Artois, 2009 -- valid
  Yungia Lang, 1884 -- valid
  Yungia aurantiaca (Delle Chiaje, 1822) -- valid
  Yungia dicquemari (Risso, 1818) -- valid
  Yungia miniata (Schmarda, 1859) -- invalid
  Yungia rubrocincta (Schmarda, 1859) -- invalid
  Yungia sasakii Kaburaki, 1923 -- invalid
  Yungia teffi Dawydoff, 1952 -- valid
  Zonorhynchidae Karling, 1952 -- invalid
  Zonorhynchinae Karling, 1952 -- invalid
  Zonorhynchus Karling, 1952 -- valid
  Zonorhynchus pipettiferus Armonies and Hellwig, 1987 -- valid
  Zonorhynchus ruber Ax, 2008 -- valid
  Zonorhynchus salinus Karling, 1952 -- valid
  Zonorhynchus seminascatus Karling, 1956 -- valid
  Zonorhynchus tvaerminnensis (Karling, 1931) -- valid
  Zuccaria Marcus, 1948 -- invalid
  Zuccaria fredelyna Marcus, 1948 -- invalid
  Zuccaria gabriellae Marcus, 1948 -- invalid
  Zygantroides Faubel, 1983 -- valid
  Zygantroides henriettae (Correa, 1949) -- valid
  Zygantroides plesia (Correa, 1949) -- valid
  Zygantroplana Laidlaw, 1906 -- valid
  Zygantroplana angusta (Verrill, 1893) -- invalid
  Zygantroplana clepeasta Kato, 1944 -- invalid
  Zygantroplana elepeasta Kato, 1944 -- invalid
  Zygantroplana henriettae Correa, 1949 -- invalid
  Zygantroplana plesia Correa, 1949 -- invalid
  Zygantroplana stylifera Hyman, 1953 -- invalid
  Zygantroplana ups Marcus and Harry, 1983 -- valid
  Zygantroplana verilli Laidlaw, 1906 -- invalid
  Zygantroplana verrilli Laidlaw, 1906 -- valid
  Zygantroplana yrsa Marcus and Marcus, 1968 -- invalid
  Zygantrum Faubel, 1983 -- valid
  Zygantrum clepeastum (Kato, 1944) -- valid
  Zygopella Cannon and Sewell, 1995 -- valid
  Zygopella deimata Cannon and Sewell, 1995 -- valid
  Zygopella pista Cannon and Sewell, 1995 -- valid
  Zygopella stenota Cannon and Sewell, 1995 -- valid
  Zygotoplana Tajika, 1983 -- valid
  Zygotoplana ezoensis Tajika, 1983 -- valid
   

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