Integrated Taxonomic Information System - Taxon Author Search Results

Expert: Roy W. McDiarmid

ITIS records citing expert
 
 Kingdom Animalia
  Abronia Gray, 1838 -- valid
  Abronia bogerti Tihen, 1954 -- valid -- Bogert's Arboreal Alligator Lizard, Lagarto alicante de Bogert
  Abronia chiszari Smith and Smith, 1981 -- valid -- Chiszar's Arboreal Alligator Lizard, Lagarto alicante de Chiszar
  Abronia deppii (Wiegmann, 1828) -- valid -- Deppe's Arboreal Alligator Lizard
  Abronia fuscolabialis (Tihen, 1944) -- valid -- Escorpión Arboricola del Zempoaltepec, Lagarto alicante de Zempoaltepec, Mount Zempoaltepec Arboreal Alligator Lizard
  Abronia graminea (Cope, 1864) -- valid -- Lagarto alicante terrestre, Sierra de Tehuacan Arboreal Alligator Lizard, Terrestrial Arboreal Alligator Lizard
  Abronia kalaina Good and Schwenk, 1985 -- invalid -- Lagarto alicante de Sierra de Juárez
  Abronia leurolepis Campbell and Frost, 1993 -- valid -- Flat-scaled Arboreal Alligator Lizard, Smoothback Arboreal Alligator Lizard
  Abronia lythrochila Smith and Alvarez del Toro, 1963 -- valid -- Lagarto alicante labios rojos, Red-lipped Arboreal Alligator Lizard
  Abronia matudai (Hartweg and Tihen, 1946) -- valid -- Lagarto alicante rayado, Matuda's Arboreal Alligator Lizard
  Abronia mitchelli Campbell, 1982 -- valid -- Lagarto alicante de Mitchell, Mitchell's Arboreal Alligator Lizard
  Abronia mixteca Bogert and Porter, 1967 -- valid -- Lagarto alicante mixteco, Mixtecan Arboreal Alligator Lizard
  Abronia oaxacae (Günther, 1885) -- valid -- Lagarto alicante oaxaqueño, Oaxacan Arboreal Alligator Lizard
  Abronia ochoterenai (Martín del Campo, 1939) -- valid -- Lagarto alicante verde, Northern Chiapas Arboreal Alligator Lizard, Ochoterena's Arboreal Alligator Lizard
  Abronia ornelasi Campbell, 1984 -- valid -- Cerro Baul Alligator Lizard, Lagarto alicante de Cerro Baúl, Ornelas's Arboreal Alligator Lizard
  Abronia reidi Werler and Shannon, 1961 -- valid -- Lagarto alicante de Reid, Reid's Arboreal Alligator Lizard
  Abronia smithi Campbell and Frost, 1993 -- valid -- Smith's Arboreal Alligator Lizard
  Abronia taeniata (Wiegmann, 1828) -- valid -- Banded Arboreal Alligator Lizard, Bromeliad Arboreal Alligator Lizard, Lagarto alicante de bromelia
  Acanthochelys Gray, 1873 -- valid -- South American Side-necked Swamp Turtles
  Acanthochelys macrocephala (Rhodin, Mittermeier and McMorris, 1984) -- valid -- Big-headed Pantanal Swamp Turtle, Pantanal Swamp Turtle
  Acanthochelys pallidipectoris (Freiberg, 1945) -- valid -- Chaco Side-necked Turtle
  Acanthochelys radiolata (Mikan, 1820) -- valid -- Brazilian Radiolated Swamp Turtle
  Acanthochelys spixii (Duméril and Bibron, 1835) -- valid -- Black Spiny-necked Turtle, Spiny-necked Turtle, Spix's Sideneck Turtle
  Acanthodactylus Fitzinger in Wiegmann, 1834 -- valid
  Acinixys Siebenrock, 1902 -- invalid
  Acris Duméril and Bibron, 1841 -- valid -- Cricket Frogs
  Acris crepitans Baird, 1854 -- valid -- Eastern Cricket Frog, Northern Cricket Frog, Rana-grillo norteño
  Acris gryllus (LeConte, 1825) -- valid -- Southern Cricket Frog
  Adelophis Dugès, 1879 -- valid
  Adelophis copei Dugès, 1879 -- valid -- Cope's Mountain Meadow Snake, Culebra-de vega de Cope
  Adelophis foxi Rossman and Blaney, 1968 -- valid -- Culebra-de vega de Fox, Fox's Mountain Meadow Snake
  Adelphicos Jan, 1862 -- valid
  Adelphicos latifasciatus Lynch and H. M. Smith, 1966 -- invalid -- Culebra-cavadora oaxaqueña
  Adelphicos nigrilatus H. M. Smith, 1942 -- invalid -- Culebra-cavadora ocotera
  Adelphicos quadrivirgatus Jan, 1862 -- invalid -- Culebra-cavadora centroamericana
  Agama Daudin, 1802 -- valid -- Agamas
  Agamidae -- valid -- Agamid Lizards, Old World Arboreal Lizards
  Agkistrodon Palisot de Beauvois, 1799 -- valid -- American Moccasins, Copperheads, Cottonmouths
  Agkistrodon bilineatus Günther, 1863 -- valid -- Cantil enjaquimado, Mexican Moccasin
  Agkistrodon bilineatus taylori Burger and Robertson, 1951 -- invalid
  Agkistrodon contortrix (Linnaeus, 1766) -- valid -- Cantil cobrizo, Copperhead, Eastern Copperhead
  Agkistrodon piscivorus (Lacépède, 1789) -- valid -- Cottonmouth, Northern Cottonmouth
  Alligator Cuvier, 1807 -- valid -- Alligators
  Alligator mississipiensis (Daudin, 1802) -- invalid
  Alligator mississippiensis (Daudin, 1802) -- valid -- Aligator americano, Alligator, American Alligator, Florida Alligator, Gator, Louisiana Alligator, Mississippi Alligator
  Alligator sinensis Fauvel, 1879 -- valid -- Chinese Alligator, T'o, Yangtze Alligator, Yow Lung
  Alligatoridae -- valid -- Alligators, Caimans
  Allophryne ruthveni Gaige, 1926 -- valid
  Alsophis Fitzinger, 1843 -- valid -- West Indian Racers
  Alsophis portoricensis Reinhardt and Lütken, 1862 -- invalid -- Puerto Rican Racer
  Alsophis sancticrucis Cope, 1862 -- invalid -- St. Croix Racer
  Amastridium Cope, 1861 -- valid
  Amastridium veliferum Cope, 1861 -- valid -- Culebra cabeza cobriza, Rustyhead Snake
  Ambystoma Tschudi, 1838 -- valid -- Mole Salamanders
  Ambystoma annulatum Cope, 1886 -- valid -- Ringed Salamander
  Ambystoma barbouri Kraus and Petranka, 1989 -- valid -- Streamside Salamander
  Ambystoma californiense Gray, 1853 -- valid -- California Tiger Salamander
  Ambystoma cingulatum Cope, 1868 -- valid -- Flatwoods Salamander, Frosted Flatwoods Salamander
  Ambystoma gracile (Baird, 1859) -- valid -- Northwestern Salamander
  Ambystoma jeffersonianum (Green, 1827) -- valid -- Jefferson Salamander
  Ambystoma laterale Hallowell, 1856 -- valid -- Blue-spotted Salamander, salamandre à points bleus
  Ambystoma mabeei Bishop, 1928 -- valid -- Mabee's Salamander
  Ambystoma macrodactylum Baird, 1850 -- valid -- Long-toed Salamander
  Ambystoma macrodactylum croceum Russell and Anderson, 1956 -- invalid -- Santa Cruz Long-toed Salamander
  Ambystoma maculatum (Shaw, 1802) -- valid -- salamandre maculée, Spotted Salamander
  Ambystoma nothagenes Kraus, 1985 -- invalid -- Kelley's Island Salamander
  Ambystoma opacum (Gravenhorst, 1807) -- valid -- Marbled Salamander
  Ambystoma platineum Cope, 1868 -- invalid -- Silvery Salamander
  Ambystoma rivularis (Taylor, 1940) -- invalid
  Ambystoma talpoideum (Holbrook, 1838) -- valid -- Mole Salamander
  Ambystoma texanum (Matthes, 1855) -- valid -- Small-mouthed Salamander
  Ambystoma tigrinum (Green, 1825) -- valid -- Eastern Tiger Salamander, Salamandra tigre, Tiger Salamander
  Ambystoma tigrinum stebbinsi Lowe, 1954 -- invalid -- Sonoran Tiger Salamander
  Ambystoma tremblayi Comeau, 1943 -- invalid -- Tremblay's Salamander
  Ambystoma velasci Dugès, 1888 -- valid -- Salamandra tigre de meseta
  Ambystomatidae Gray, 1850 -- valid -- Mole Salamanders
  Ameiva Meyer, 1795 -- valid -- Ameivas, Ground Lizards
  Ameiva ameiva (Linnaeus, 1758) -- valid -- Amazon Racerunner, Giant Ameiva, Neotropical Ameiva, South American Ground Lizard, Zandolie
  Ameiva chaitzami Stuart, 1942 -- invalid -- Ameiva de Chaitzam
  Ameiva exsul Cope, 1862 -- invalid -- Puerto Rican Ground Lizard
  Ameiva festiva (Lichtenstein and Martens in Lichtenstein, 1856) -- invalid -- Ameiva centroamericana
  Ameiva polops Cope, 1862 -- invalid -- St. Croix Ground Lizard
  Ameiva undulata (Wiegmann, 1834) -- invalid -- Ameiva metálica o arcoiris
  Ameiva wetmorei Stejneger, 1913 -- invalid -- Blue-tailed Ground Lizard
  Amphibia -- valid -- Amphibians, amphibiens, anfíbio
  Amphibolurus Wagler, 1830 -- valid
  Amphisbaena Linnaeus, 1758 -- valid -- Tropical Worm Lizards
  Amphisbaena bakeri Stejneger, 1904 -- valid -- Baker's Worm Lizard, Puerto Rican Many-ringed Worm Lizard
  Amphisbaena caeca Cuvier, 1829 -- valid -- Blind Worm Lizard, Common Puerto Rican Worm Lizard, Puerto Rican Worm Lizard
  Amphisbaena fenestrata (Cope, 1861) -- valid -- Cope's Worm Lizard, Virgin Islands Worm Lizard
  Amphisbaena schmidti Gans, 1964 -- valid -- Puerto Rican Dusky Worm Lizard, Schmidt's Worm Lizard
  Amphisbaena xera Thomas, 1966 -- valid -- Dry Worm Lizard, North American Worm Lizard, Puerto Rican Dryland Worm Lizard, Puerto Rican Xeric Worm Lizard
  Amphisbaenia -- valid -- Amphisbaenians, Worm Lizards
  Amphisbaenidae Gray, 1865 -- valid -- Amphisbaenids, Tropical Worm Lizards
  Amphiuma Garden in Smith, 1821 -- valid -- Amphiumas
  Amphiuma means Garden in Smith, 1821 -- valid -- Two-toed Amphiuma
  Amphiuma pholeter Neill, 1964 -- valid -- One-toed Amphiuma
  Amphiuma tridactylum Cuvier, 1827 -- valid -- Three-toed Amphiuma
  Amphiumidae Gray, 1825 -- valid -- Amphiumas, Congo Eels
  Amyda Geoffroy Saint-Hilaire, 1809 -- valid -- Asiatic Softshell Turtles
  Amyda cartilaginea (Boddaert, 1770) -- valid -- Asiatic Softshell Turtle
  Amyda ferox hartwegi Conant and Goin, 1948 -- invalid
  Amyda ferox spinifera (Le Sueur, 1827) -- invalid
  Anapsida -- invalid
  Andrias davidianus (Blanchard, 1871) -- valid -- Chinese Giant Salamander
  Aneides Baird, 1851 -- valid -- Climbing Salamanders
  Aneides aeneus (Cope and Packard, 1881) -- valid -- Green Salamander
  Aneides ferreus Cope, 1869 -- valid -- Clouded Salamander
  Aneides flavipunctatus (Strauch, 1870) -- valid -- Black Salamander
  Aneides hardii (Taylor, 1941) -- valid -- Sacramento Mountain Salamander, Sacramento Mountains Salamander
  Aneides lugubris (Hallowell, 1849) -- valid -- Arboreal Salamander, Salamandra arbórea
  Anelytropsis Cope, 1885 -- valid -- Mexican Blind Lizard
  Anelytropsis papillosus Cope, 1885 -- valid -- Lagartija Ciega Mexicana, Lagartija-ciega mexicana, Mexican Blind Lizard
  Anguidae -- valid -- Alligator Lizards, Anguid Lizards, Anguids, Galliwasps, Glass Lizards
  Annamemys Bourret, 1939 -- invalid -- Annam Leaf Turtles
  Annamemys annamensis (Siebenrock, 1903) -- invalid -- Annam Leaf Turtle
  Anniella Gray, 1852 -- valid -- American legless lizards, California legless lizards, Legless Lizards, North American Legless Lizards
  Anniella geronimensis Shaw, 1940 -- valid -- Baja California Legless Lizard, Lagartija sin patas de Isla Jerónimo
  Anniella pulchra Gray, 1852 -- valid -- California Legless Lizard, Lagartija sin patas californiana, Northern Legless Lizard, Silvery Legless Lizard
  Anniellidae -- invalid -- Legless Lizards, North American Legless Lizards
  Anolis Daudin, 1802 -- valid -- Anoles, Western Antillean Anoles
  Anolis adleri H. M. Smith, 1972 -- invalid -- Anolis de Adler
  Anolis anisolepis H. M. Smith, Burley and Fritts, 1968 -- valid -- Anolis adornado, Chiapas Ornate Anole
  Anolis baccatus Bocourt, 1873 -- invalid -- Anolis de Bocourt
  Anolis barkeri K. P. Schmidt, 1939 -- valid -- Anolis de Barker, Barker's Anole
  Anolis biporcatus (Wiegmann, 1834) -- valid -- Anolis verde neotropical, Giant Green Anole, Neotropical Green Anole
  Anolis breedlovei H. M. Smith and Paulson, 1968 -- invalid -- Anolis de Breedlove
  Anolis capito W. C. H. Peters, 1863 -- valid -- Anolis jaspeado, Bighead Anole
  Anolis carolinensis Voigt in Cuvier and Voigt, 1832 -- valid -- anole vert, Anolis verde, Green Anole
  Anolis chlorocyanus A. M. C. Duméril and Bibron, 1837 -- valid -- Hispaniolan Blue-green Anole, Hispaniolan Green Anole, Northern Hispaniolan Green Anole
  Anolis compressicaudus H. M. Smith and Kerster, 1955 -- valid -- Anolis de Malpaso, Malposo Scaly Anole
  Anolis crassulus Cope, 1864 -- valid -- Anolis adornado, Ornate Anole
  Anolis cumingii W. C. H. Peters, 1863 -- invalid
  Anolis cuprinus H. M. Smith, 1964 -- valid -- Anolis chiapaneco, Copper Anole
  Anolis cymbops Cope, 1864 -- valid -- Anolis veracruzano, Cope's Veracruz Anole
  Anolis dollfusianus Bocourt, 1873 -- valid -- Anolis cafetalero, Coffee Anole
  Anolis duellmani Fitch and Henderson, 1973 -- valid -- Anolis de Duellman, Duellman's Pigmy Anole
  Anolis dunni H. M. Smith, 1936 -- valid -- Anolis de Dunn, Dunn's Anole
  Anolis equestris Merrem, 1820 -- valid -- Knight Anole
  Anolis forbesi H. M. Smith and Van Gelder, 1955 -- invalid -- Anolis de Forbes
  Anolis gadovii Boulenger, 1905 -- valid -- Gadow's Anole
  Anolis isthmicus Fitch, 1978 -- invalid -- Anolis tehuano
  Anolis laeviventris (Wiegmann, 1834) -- valid -- Anolis blanco, White Anole
  Anolis lemurinus Cope, 1861 -- valid -- Anolis fantasma, Ghost Anole
  Anolis liogaster Boulenger, 1905 -- valid -- Anolis rojo, Guerreran Anole
  Anolis longiceps K. P. Schmidt, 1919 -- valid -- Navassa Anole
  Anolis macrinii H. M. Smith, 1968 -- valid -- Anolis de Macrinus, Macrinius' Anole
  Anolis matudai H. M. Smith, 1956 -- valid -- Anolis de Matuda, Matuda's Anole
  Anolis megapholidotus H. M. Smith, 1933 -- valid -- Anolis de escamas grandes, Large-scaled Anole
  Anolis microlepidotus Davis, 1954 -- valid -- Anolis guerrerense, Guerreran Oak Anole
  Anolis milleri H. M. Smith in H. M. Smith and Taylor, 1950 -- valid -- Anolis de Miller, Miller's Anole
  Anolis naufragus (Campbell, Hillis and Lamar, 1989) -- valid -- Anolis de Hidalgo, Hidalgo Anole
  Anolis nebuloides Bocourt, 1873 -- valid -- Anolis falso-pañuelo, False Clouded Anole
  Anolis nebulosus (Wiegmann, 1834) -- valid -- Anolis pañuelo, Clouded Anole
  Anolis occultus Williams and Rivero, 1965 -- valid -- Dwarf Anole, Limestone Anole, Puerto Rican Twig Anole, Pygmy Anole
  Anolis omiltemanus Davis, 1954 -- valid -- Anolis de Omilteme, Omilteme Anole
  Anolis parvicirculatus Álvarez del Toro and H. M. Smith, 1956 -- valid -- Anolis de Barriozabal, Berriozabal Anole
  Anolis pentaprion Cope, 1863 -- valid -- Anolis liquen, Lichen Anole
  Anolis petersii Bocourt, 1873 -- valid -- Peters' Anole
  Anolis polyrhachis H. M. Smith, 1968 -- invalid -- Anolis de Sierra de Juárez
  Anolis porcatus Gray, 1840 -- valid -- Cuban Green Anole
  Anolis pygmaeus Álvarez del Toro and H. M. Smith, 1956 -- valid -- Anolis pigmeo-de Chiapas, Chiapas Pigmy Anole
  Anolis quercorum Fitch, 1978 -- valid -- Anolis encinero, Gray Anole, Oaxacan Oak Anole
  Anolis rodriguezi Bocourt, 1873 -- invalid -- Anolis liso
  Anolis schiedii (Wiegmann, 1834) -- valid -- Schiede's Anole
  Anolis schmidti H. M. Smith, 1939 -- invalid -- Anolis de Schmidt
  Anolis sericeus Hallowell, 1856 -- valid -- Anolis sedoso, Silky Anole
  Anolis simmonsi Holman, 1964 -- invalid -- Anolis de Simmons
  Anolis subocularis Davis, 1954 -- valid -- Anolis del Pacífico, Pacific Anole
  Anolis taylori H. M. Smith and Spieler, 1945 -- valid -- Anolis de Taylor, Taylor's Anole
  Anolis tropidonotus W. C. H. Peters, 1863 -- valid -- Anolis escamoso-mayor, Greater Scaly Anole
  Anolis uniformis Cope, 1885 -- valid -- Anolis escamoso-menor, Lesser Scaly Anole
  Anolis utowanae Barbour, 1932 -- invalid -- Anolis de Utowana
  Anomochilidae Cundall, Wallach and Rossman, 1993 -- valid -- Dwarf Pipe Snakes
  Anura -- valid -- crapauds, Frogs, grenouilles, perereca, rã, sapo, Toads
  Apalone Rafinesque, 1832 -- valid -- North American Softshell Turtles, North American Softshells
  Apalone ferox (Schneider, 1783) -- valid -- Florida Softshell, Florida Softshell Turtle
  Apalone mutica (Le Sueur, 1827) -- valid -- Smooth Softshell, Smooth Softshell Turtle
  Apalone mutica calvata (Webb, 1959) -- valid -- Gulf Coast Smooth Softshell, Gulf Coast Smooth Softshell Turtle
  Apalone mutica mutica (Le Sueur, 1827) -- valid -- Midland Smooth Softshell, Midland Smooth Softshell Turtle
  Apalone spinifera (Le Sueur, 1827) -- valid -- Spiny Softshell, Spiny Softshell Turtle, tortue-molle à épines, Tortuga-casco suave espinosa
  Apalone spinifera aspera (Agassiz, 1857) -- valid -- Gulf Coast Spiny Softshell, Gulf Coast Spiny Softshell Turtle
  Apalone spinifera ater (Webb and Legler, 1960) -- invalid -- Cuatro Cienegas softshell turtle, Tortuga-casco suave de Cuatro Ciénegas
  Apalone spinifera emoryi (Agassiz, 1857) -- valid -- Texas Spiny Softshell, Texas Spiny Softshell Turtle
  Apalone spinifera guadalupensis (Webb, 1962) -- valid -- Guadalupe Spiny Softshell, Guadalupe Spiny Softshell Turtle
  Apalone spinifera pallida (Webb, 1962) -- valid -- Pallid Spiny Softshell, Pallid Spiny Softshell Turtle
  Apalone spinifera spinifera (Le Sueur, 1827) -- valid -- Eastern Spiny Softshell, Northern Spiny Softshell Turtle
  Apsidospondyli -- invalid
  Archosauria -- invalid
  Aristelliger Cope, 1862 -- valid -- Croaking Geckos
  Aristelliger cochranae Grant, 1931 -- valid -- Cochran's Croaking Gecko
  Aristelliger georgeensis (Bocourt, 1873) -- valid -- Geco pestañudo
  Arizona Kennicott in Baird, 1859 -- valid -- Glossy Snakes
  Arizona elegans Kennicott in Baird, 1859 -- valid -- Culebra brillante, Glossy Snake
  Arrhyton Günther, 1858 -- valid -- West Indian Garden Snakes
  Arrhyton exiguum (Cope, 1863) -- invalid -- Puerto Rican Garden Snake
  Ascaphidae Fejérváry, 1923 -- valid -- Tailed Frogs
  Ascaphus Stejneger, 1899 -- valid -- Tailed Frogs
  Ascaphus truei Stejneger, 1899 -- valid -- Coastal Tailed Frog, Tailed Frog
  Aspideretes Hay, 1904 -- invalid -- Indian Softshell Turtles
  Aspideretes gangeticus (Cuvier, 1825) -- invalid -- Indian Softshell Turtle
  Aspideretes hurum (Gray, 1830) -- invalid -- Indian peacock softshell turtle, peacock softshell turtle
  Aspideretes leithii (Gray, 1872) -- invalid -- Leith's Softshell Turtle
  Aspideretes nigricans (Anderson, 1875) -- invalid -- Black Softshell Turtle
  Aspidonectes emoryi Agassiz, 1857 -- invalid
  Aspidoscelis burti stictogramma (Burger, 1950) -- invalid -- Giant Spotted Whiptail, Huico Manchado Gigante
  Aspidoscelis hyperythra beldingi (Stejneger, 1894) -- invalid
  Aspidoscelis sexlineata (Linnaeus, 1766) -- invalid -- Six-lined Racerunner
  Atheris Cope, 1862 -- valid
  Atropoides Werman, 1992 -- valid
  Atropoides nummifer (Rüppell, 1845) -- valid -- Jumping Pit Viper, Nauyaca o nayaraca saltadora
  Atropoides olmec (Perez-Higareda, H. M. Smith and Julia-Zertuche, 1985) -- valid -- Nauyaca de Los Tuxtlas, Olmecan Pit Viper
  Autarchoglossa -- valid
  Azemiopinae Liem, Marx and Rabb, 1971 -- valid
  Azemiops Boulenger, 1888 -- valid
  Bachia heteropa (Lichtenstein and Martens in Lichtenstein, 1856) -- valid -- LaGuaira Bachia, Worm Lizard
  Bachia heteropa heteropa (Lichtenstein and Martens in Lichtenstein, 1856) -- invalid
  Barisia Gray, 1838 -- valid
  Barisia imbricata (Wiegmann, 1828) -- valid -- Imbricate Alligator Lizard, Lagarto alicante del Popocatépetl, Transvolcanic Alligator Lizard
  Barisia levicollis Stejneger, 1890 -- valid -- Chihuahuan Alligator Lizard, Lagarto alicante de Chihuahua
  Barisia rudicollis (Wiegmann, 1828) -- valid -- Lagarto alicante cuello rugoso, Rough-necked Alligator Lizard
  Basiliscus Laurenti, 1768 -- valid -- Basilisks
  Basiliscus vittatus Wiegmann, 1828 -- valid -- Basilisco rayado, Brown Basilisk
  Batagur Gray, 1856 -- valid -- river terrapins
  Batagur baska (Gray, 1830) -- valid -- Common River Terrapin, Northern River Terrapin, Ranong River Terrapin, River Terrapin, Tuntong
  Bataguridae Gray, 1869 -- invalid -- Batagurine Turtles
  Batrachemys Stejneger, 1909 -- invalid
  Batrachoseps Bonaparte, 1839 -- valid -- Slender Salamanders
  Batrachoseps aridus Brame, 1970 -- invalid -- Desert Slender Salamander
  Batrachoseps attenuatus (Eschscholtz, 1833) -- valid -- California Slender Salamander
  Batrachoseps campi Marlow, Brode and Wake, 1979 -- valid -- Inyo Mountains Salamander, Inyo Mountains Slender Salamander
  Batrachoseps diabolicus Jockusch, Wake and Yanev, 1998 -- valid -- Hell Hollow Slender Salamander
  Batrachoseps gabrieli Wake, 1996 -- valid -- San Gabriel Mountains Slender Salamander
  Batrachoseps gregarius Jockusch, Wake and Yanev, 1998 -- valid -- Gregarious Slender Salamander
  Batrachoseps kawia Jockusch, Wake and Yanev, 1998 -- valid -- Sequoia Slender Salamander
  Batrachoseps major Camp, 1915 -- valid -- Garden Slender Salamander, Southern California Slender Salamander
  Batrachoseps nigriventris Cope, 1869 -- valid -- Black-bellied Slender Salamander
  Batrachoseps pacificus (Cope, 1865) -- valid -- Channel Islands Slender Salamander, Pacific Slender Salamander, Salamandra-delgada del Pacífico
  Batrachoseps regius Jockusch, Wake and Yanev, 1998 -- valid -- Kings River Slender Salamander
  Batrachoseps relictus Brame and Murray, 1968 -- valid -- Relictual Slender Salamander
  Batrachoseps simatus Brame and Murray, 1968 -- valid -- Kern Canyon Slender Salamander
  Batrachoseps stebbinsi Brame and Murray, 1968 -- valid -- Tehachapi Slender Salamander
  Batrachoseps wrighti (Bishop, 1937) -- valid -- Oregon Slender Salamander
  Bipes Latreille in Sonnini and Latreille, 1801 -- valid
  Bipes biporus (Cope, 1894) -- valid -- Five-toed Worm Lizard, Lagartija-topo cinco dedos
  Bipes canaliculatus Latreille in Sonnini and Latreille, 1801 -- valid -- Four-toed Worm Lizard, Lagartija-topo cuatro dedos
  Bipes tridactylus (Dugès, 1894) -- valid -- Lagartija-topo tres dedos, Three-toed Worm Lizard
  Bitis Gray, 1842 -- valid
  Bogertophis Dowling and Price, 1988 -- valid -- Desert Rat Snakes, Desert Ratsnakes
  Bogertophis rosaliae (Mocquard, 1899) -- valid -- Baja California Rat Snake, Baja California Ratsnake, Culebra-ratonera de Baja California
  Bogertophis subocularis (Brown, 1901) -- valid -- Culebra-ratonera de Transpecos, Trans-Pecos Rat Snake, Trans-Pecos Ratsnake
  Boidae Gray, 1825 -- valid -- Boas, Boids
  Boiga Fitzinger, 1826 -- valid -- Boigas, Catsnakes
  Boiga irregularis (Bechstein, 1802) -- valid -- Brown Cat Snake, Brown Tree Snake, Brown Treesnake
  Bothriechis Peters, 1859 -- valid
  Bothriechis aurifer (Salvin, 1860) -- valid -- Nauyaca-de árbol manchas amarillas, Yellow-blotched Palm Pit Viper
  Bothriechis bicolor (Bocourt, 1868) -- valid -- Guatemala Palm Pit Viper, Nauyaca-de árbol bicolor
  Bothriechis rowleyi (Bogert, 1968) -- valid -- Nauyaca-de árbol de Rowley, Rowley's Palm Pit Viper
  Bothriechis schlegelii (Berthold, 1846) -- valid -- Eyelash Viper
  Bothriopsis Peters, 1861 -- invalid
  Bothrocophias Gutberlet and Campbell, 2001 -- valid
  Bothrops Wagler, 1824 -- valid
  Bothrops asper (Garman, 1883) -- valid -- Nauyaca-terciopelo real, Terciopelo, Terciopelo
  Brachylophus Cuvier in Guérin-Méneville, 1829 -- valid -- Melanesian Iguanas
  Bradypodion Fitzinger, 1843 -- valid -- Dwarf Chameleons
  Bradypodion adolfifriderici (Sternfeld, 1912) -- invalid
  Bradypodion caffer (Boettger, 1889) -- valid -- Transkei Dwarf Chameleon
  Bradypodion carpenteri (Parker, 1929) -- invalid
  Bradypodion damaranum (Boulenger, 1887) -- valid -- Knysna Dwarf Chameleon
  Bradypodion dracomontanum Raw, 1976 -- valid -- Drakensberg Dwarf Chameleon
  Bradypodion excubitor (Barbour, 1911) -- invalid
  Bradypodion fischeri (Reichenow, 1887) -- invalid
  Bradypodion gutturale (A. Smith, 1849) -- valid -- Robertson's Dwarf Chameleon
  Bradypodion karrooicum (Methuen and Hewitt, 1914) -- invalid -- Karoo Dwarf Chameleon
  Bradypodion kentanicum (Hewitt, 1935) -- valid -- Kentani Dwarf Chameleon
  Bradypodion melanocephalum (Gray, 1865) -- valid -- Black-headed Dwarf Chameleon
  Bradypodion mlanjense (Broadley, 1965) -- invalid
  Bradypodion nemorale Raw, 1978 -- valid -- Qudeni Dwarf Chameleon, Zululand Dwarf Chameleon
  Bradypodion occidentale (Hewitt, 1935) -- valid
  Bradypodion oxyrhinum Klaver and Böhme, 1988 -- invalid
  Bradypodion pumilum (J. F. Gmelin, 1789) -- valid -- Cape Dwarf Chameleon
  Bradypodion setaroi Raw, 1976 -- valid -- Setaro's Dwarf Chameleon
  Bradypodion taeniabronchum (A. Smith, 1831) -- valid -- Smith's Dwarf Chameleon
  Bradypodion tavetanum (Steindachner, 1891) -- invalid
  Bradypodion tenue (Matschie, 1892) -- invalid
  Bradypodion thamnobates Raw, 1976 -- valid -- Natal Midlands Dwarf Chameleon
  Bradypodion transvaalense (FitzSimons, 1930) -- valid -- Transvaal Dwarf Chameleon
  Bradypodion uthmoelleri (L. Müller, 1938) -- invalid
  Bradypodion ventrale (Gray, 1845) -- valid -- Southern Dwarf Chameleon
  Bradypodion xenorhinum (Boulenger, 1901) -- invalid
  Brookesia Gray, 1865 -- valid
  Brookesia ambreensis Raxworthy and Nussbaum, 1995 -- valid
  Brookesia antakarana Raxworthy and Nussbaum, 1995 -- valid
  Brookesia bekolosy Raxworthy and Nussbaum, 1995 -- valid
  Brookesia betschi Brygoo, Blanc and Domergue, 1974 -- valid
  Brookesia bonsi Ramanantsoa, 1980 -- valid
  Brookesia brygooi Raxworthy and Nussbaum, 1995 -- valid
  Brookesia decaryi Angel, 1939 -- valid -- Spiny Leaf Chameleon
  Brookesia dentata Mocquard, 1900 -- valid -- Toothed Leaf Chameleon
  Brookesia ebenaui (Boettger, 1880) -- valid -- Northem Leaf Chameleon
  Brookesia exarmata Schimmenti and Jesu, 1996 -- valid
  Brookesia griveaudi Brygoo, Blanc and Domergue, 1974 -- valid -- Marojejy Leaf Chameleon
  Brookesia karchei Brygoo, Blanc and Domergue, 1970 -- valid
  Brookesia lambertoni Brygoo and Domergue, 1970 -- valid -- Fito Leaf Chameleon
  Brookesia lineata Raxworthy and Nussbaum, 1995 -- valid
  Brookesia lolontany Raxworthy and Nussbaum, 1995 -- invalid
  Brookesia minima Boettger, 1893 -- valid -- Minute Leaf Chameleon
  Brookesia nasus Boulenger, 1887 -- invalid
  Brookesia perarmata (Angel, 1933) -- valid -- Antsingy Leaf Chameleon
  Brookesia peyrierasi Brygoo and Domergue, 1974 -- valid
  Brookesia stumpffi Boettger, 1894 -- valid -- Plated Leaf Chameleon
  Brookesia superciliaris (Kuhl, 1820) -- valid -- Brown Leaf Chameleon
  Brookesia therezieni Brygoo and Domergue, 1970 -- valid -- Permet Leaf Chameleon
  Brookesia thieli Brygoo and Domergue, 1969 -- valid -- Domergue's Leaf Chameleon
  Brookesia tuberculata Mocquard, 1894 -- valid -- Mount d'Ambre Leaf Chameleon
  Brookesia vadoni Brygoo and Domergue, 1968 -- valid -- Iaraka River Leaf Chameleon
  Brookesia valerieae Raxworthy, 1991 -- valid
  Brookesiinae -- valid
  Bufo Laurenti, 1768 -- invalid -- Toads
  Bufo alvarius Girard in Baird, 1859 -- invalid -- Colorado River Toad, Sapo del desierto-sonorense, Sonoran Desert Toad
  Bufo americanus Holbrook, 1836 -- invalid -- American Toad, crapaud d'Amérique
  Bufo americanus americanus Holbrook, 1836 -- invalid -- Eastern American Toad
  Bufo americanus charlesmithi Bragg, 1954 -- invalid -- Dwarf American Toad
  Bufo baxteri Porter, 1968 -- invalid -- Wyoming Toad
  Bufo boreas Baird and Girard, 1852 -- invalid -- Sapo del Oeste, Western Toad
  Bufo boreas boreas Baird and Girard, 1852 -- invalid -- Boreal Toad
  Bufo boreas halophilus Baird and Girard, 1853 -- invalid -- California Toad
  Bufo boreas nelsoni Stejneger, 1893 -- invalid -- Amargosa Toad
  Bufo californicus Camp, 1915 -- invalid -- Arroyo Toad
  Bufo canorus Camp, 1916 -- invalid -- Yosemite Toad
  Bufo cognatus Say in James, 1822 -- invalid -- Great Plains Toad, Sapo de la gran planicie
  Bufo debilis Girard, 1854 -- invalid -- Green Toad, Sapo verde
  Bufo debilis debilis Girard, 1854 -- invalid -- Eastern Green Toad
  Bufo debilis insidior Girard, 1854 -- invalid -- Western Green Toad
  Bufo exsul Myers, 1942 -- invalid -- Black Toad
  Bufo fowleri Hinckley, 1882 -- invalid -- Fowler's Toad
  Bufo hemiophrys Cope, 1886 -- invalid -- Canadian Toad
  Bufo hemiophrys baxteri Porter, 1968 -- invalid -- Wyoming Toad
  Bufo hemiophrys hemiophrys Cope, 1886 -- invalid -- Canadian Toad
  Bufo houstonensis Sanders, 1953 -- invalid -- Houston Toad
  Bufo insidior Girard, 1854 -- invalid
  Bufo kelloggi Taylor, 1938 -- invalid -- Sapo mexicano-menor
  Bufo lemur (Cope, 1869) -- invalid -- Puerto Rican Crested Toad, Ridge-headed Toad
  Bufo macrocristatus Firschein and Smith, 1957 -- invalid
  Bufo marinus (Linnaeus, 1758) -- invalid -- Cane Toad, Giant Toad, Marine Toad, Sapo gigante
  Bufo microscaphus Cope, 1867 -- invalid -- Arizona Toad, Sapo del suroeste, Southwestern Toad
  Bufo microscaphus microscaphus Cope, 1867 -- invalid -- Arizona Toad
  Bufo nelsoni Stejneger, 1893 -- invalid -- Amargosa Toad
  Bufo paracnemis Lutz, 1925 -- invalid
  Bufo punctatus Baird and Girard, 1852 -- invalid -- Red-spotted Toad, Sapo manchas rojas
  Bufo quercicus Holbrook, 1840 -- invalid -- Oak Toad
  Bufo retiformis Sanders and Smith, 1951 -- invalid -- Sapo verde-sonorense, Sonoran Green Toad
  Bufo schneideri Werner, 1894 -- invalid
  Bufo speciosus Girard, 1854 -- invalid -- Sapo texano, Texas Toad
  Bufo terrestris (Bonnaterre, 1789) -- invalid -- Southern Toad
  Bufo tutelarius Mendelson, 1997 -- invalid
  Bufo typhonius (Linnaeus, 1758) -- invalid
  Bufo valliceps Wiegmann, 1833 -- invalid -- Gulf Coast Toad, Sapo del golfo
  Bufo valliceps macrocristatus Firschein and Smith, 1957 -- invalid
  Bufo valliceps valliceps Wiegmann, 1833 -- invalid -- Gulf Coast Toad
  Bufo woodhousii Girard, 1854 -- invalid -- Woodhouse's Toad
  Bufo woodhousii australis Shannon and Lowe, 1955 -- invalid -- Southwestern Woodhouse's Toad
  Bufo woodhousii velatus Bragg and Sanders, 1951 -- invalid -- East Texas Toad
  Bufo woodhousii woodhousii Girard, 1854 -- invalid -- Rocky Mountain Toad, Woodhouse's Toad
  Bufonidae Gray, 1825 -- valid -- bufonidés, Bufonids, crapauds, Toads
  Caiman Spix, 1825 -- valid -- Caimans
  Caiman crocodilus (Linnaeus, 1758) -- valid -- Common Caiman, Spectacled Caiman
  Caiman crocodilus apaporiensis Medem, 1955 -- valid -- Apaporis River Caiman
  Caiman crocodilus chiapasius (Bocourt, 1876) -- valid
  Caiman crocodilus crocodilus (Linnaeus, 1758) -- valid -- Common Caiman
  Caiman crocodilus fuscus (Cope, 1868) -- valid -- Brown Caiman
  Caiman crocodilus yacare (Daudin, 1801) -- invalid
  Caiman latirostris (Daudin, 1801) -- valid -- Broad-snouted Caiman
  Caiman yacare (Daudin, 1801) -- valid -- jacare, Jacare Caiman, Panama Caiman, Paraguayan Caiman, Piranha Caiman, Red Caiman, Southern Spectacled Caiman, Yacare Caiman
  Callagur Gray, 1870 -- invalid -- Painted Terrapins
  Callagur borneoensis (Schlegel and Müller, 1845) -- invalid -- Painted Terrapin
  Calliophis intestinalis bilineatus W. C. H. Peters, 1881 -- valid
  Calliophis intestinalis lineatus (Gray in Gray and Hardwicke, 1835) -- valid
  Calliophis intestinalis philippina Günther, 1864 -- invalid
  Calliophis intestinalis philippinus Günther, 1864 -- valid
  Callisaurus Blainville, 1835 -- valid -- Zebra-tailed Lizards
  Callisaurus draconoides Blainville, 1835 -- valid -- Lagartija cachora, Zebra-tailed Lizard
  Callisaurus draconoides myurus Richardson, 1915 -- valid -- Nevada Gridiron-tailed Lizard, Nevada Zebratail Lizard, Northern Zebra-tailed Lizard
  Callisaurus draconoides ventralis (Hallowell, 1852) -- valid -- Arizona Gridiron-tailed Lizard, Arizona Zebra-tailed Lizard, Arizona Zebratail Lizard, Eastern Zebratail Lizard
  Calloselasma Cope, 1860 -- valid
  Calotes Cuvier, 1817 -- valid -- Calotes
  Calumma Gray, 1865 -- valid
  Calumma amber Raxworthy and Nussbaum, 2006 -- valid -- Amber Chameleon
  Calumma andringitraense (Brygoo, Blanc and Domergue, 1972) -- valid
  Calumma boettgeri (Boulenger, 1888) -- valid
  Calumma brevicorne (Günther, 1879) -- valid
  Calumma brevicornis (Günther, 1879) -- invalid
  Calumma capuroni (Brygoo, Blanc and Domergue, 1972) -- valid
  Calumma crypticum Raxworthy and Nussbaum, 2006 -- valid -- Cryptic Chameleon
  Calumma cucullatum (Gray, 1831) -- valid
  Calumma fallax (Mocquard, 1900) -- valid
  Calumma furcifer (Vailland and Grandidier, 1880) -- valid
  Calumma furciferum (Vailland and Grandidier, 1880) -- invalid
  Calumma gallus (Günther, 1877) -- valid
  Calumma gastrotaenia (Boulenger, 1888) -- invalid
  Calumma gastrotaenium (Boulenger, 1888) -- valid
  Calumma glawi Böhme, 1997 -- valid
  Calumma globifer (Günther, 1879) -- valid
  Calumma globiferum (Günther, 1879) -- invalid
  Calumma guibei (Hillenius, 1959) -- valid
  Calumma guillaumeti (Brygoo, Blanc and Domergue, 1974) -- valid
  Calumma hafahafa Raxworthy and Nussbaum, 2006 -- valid -- Bizarre-Nosed Chameleon
  Calumma hilleniusi (Brygoo, Blanc and Domergue, 1973) -- valid
  Calumma jejy Raxworthy and Nussbaum, 2006 -- valid -- Marojejy Peak Chameleon
  Calumma linotum (L. Müller, 1924) -- valid
  Calumma malthe (Günther, 1879) -- valid
  Calumma marojezense (Brygoo, Blanc and Domergue, 1970) -- valid
  Calumma nasutum (A. M. C. Duméril and Bibron, 1836) -- valid
  Calumma oshaughnessyi (Günther, 1881) -- valid
  Calumma parsonii (Cuvier, 1824) -- valid -- Parson's Chameleon
  Calumma peltierorum Raxworthy and Nussbaum, 2006 -- valid -- Peltiers' Chameleon
  Calumma peyrierasi (Brygoo, Blanc and Domergue, 1974) -- valid
  Calumma tigris (Kuhl, 1820) -- invalid
  Calumma tsaratananense (Brygoo and Domergue, 1967) -- valid
  Calumma tsycorne Raxworthy and Nussbaum, 2006 -- valid -- Blunt-Nosed Chameleon
  Calumma vatosoa Andreone, Mattioli, Jesu and Randrianirina, 2001 -- valid
  Calumma vencesi Andreone, Mattioli, Jesu and Randrianirina, 2001 -- valid
  Calyptocephalella testudiniceps (Cope, 1862) -- invalid
  Candoia Gray, 1842 -- valid -- Bevel-nosed Boas, Keel-scaled Boas
  Candoia bibroni (A. M. C. Duméril and Bibron, 1844) -- valid -- Bibron's Bevel-nosed Boa, Bibron's Keel-scaled Boa, Pacific Tree Boa
  Candoia carinata (Schneider, 1801) -- valid -- Pacific Ground Boa, Pacific Keel-scaled Boa
  Caretta Rafinesque, 1814 -- valid -- Loggerhead Sea Turtles
  Caretta caretta (Linnaeus, 1758) -- valid -- Loggerhead, Loggerhead Sea Turtle, Tortuga-marina caguama
  Caretta caretta caretta (Linnaeus, 1758) -- invalid
  Caretta remivaga Hay, 1908 -- invalid
  Carettochelyidae Boulenger, 1887 -- valid -- Pitted-shelled Turtles
  Carettochelys Ramsay, 1886 -- valid -- Pig-nosed Turtle
  Carettochelys insculpta Ramsay, 1886 -- valid -- Fly River Turtle, Pig-Nosed Turtle
  Carlia Gray, 1845 -- valid -- Four-fingered Skinks, Rainbow Skinks
  Carlia fusca (A. M. C. Duméril and Bibron, 1839) -- valid -- Brown Four-fingered Skink, Curious Skink, Indonesian Brown Skink Carlia
  Carphophis Gervais, 1843 -- valid -- Worm Snakes, Wormsnakes
  Carphophis amoenus (Say, 1825) -- valid -- Common Wormsnake, Eastern Worm Snake, Eastern Wormsnake
  Carphophis vermis (Kennicott, 1859) -- valid -- Western Worm Snake, Western Wormsnake
  Caudata -- valid -- Salamanders, salamandra, salamandres
  Causinae Cope, 1859 -- valid
  Causus Wagler, 1830 -- valid
  Celestus Gray, 1839 -- valid -- Galliwasps
  Celestus costatus (Cope, 1862) -- valid -- Common Hispaniolan Galliwasp, Costate Galliwasp, Hispaniolan Smooth Galliwasp
  Celestus enneagrammus (Cope, 1861) -- valid -- Celesto huasteco, Huaxteca Lesser Galliwasp
  Celestus rozellae Smith, 1942 -- valid -- Celesto vientre verde, Rozella's Lesser Galliwasp
  Cemophora Cope, 1860 -- valid -- Scarlet Snakes, Scarletsnakes
  Cemophora coccinea (Blumenbach, 1788) -- valid -- Scarlet Snake, Scarletsnake
  Centrolenella fleischmanni (Boettger, 1893) -- invalid -- Rana vientre traslúcido
  Cerastes Laurenti, 1768 -- valid
  Cerberus Cuvier, 1829 -- valid -- Dog-faced Water Snakes
  Cerberus rynchops (Schneider, 1799) -- valid -- Dog-faced Water Snake, South Asian Bockadam
  Cerberus schneideri (Schlegel, 1837) -- valid -- Southeast Asian Bockadam
  Cerrophidion Campbell and Lamar, 1992 -- valid
  Cerrophidion barbouri (Dunn, 1919) -- invalid -- Nauyaca-de montaña guerrerense
  Cerrophidion godmani (Günther, 1863) -- valid -- Godman's Montane Pit Viper, Nauyaca-de montaña de Godman
  Cerrophidion tzotzilorum (Campbell, 1985) -- valid -- Nauyaca-de montaña tzotzil, Tzotzil Montane Pit Viper
  Chamaeleo Laurenti, 1768 -- valid -- Chameleons
  Chamaeleo affinis Rüppell, 1845 -- invalid
  Chamaeleo africanus Laurenti, 1768 -- valid -- African Chameleon
  Chamaeleo anchietae Bocage, 1872 -- valid -- Double-scaled Chameleon
  Chamaeleo arabicus Matschie, 1893 -- valid -- Arabian Chameleon
  Chamaeleo balebicornutus Tilbury, 1998 -- invalid
  Chamaeleo bitaeniatus Fischer, 1884 -- invalid
  Chamaeleo calcaricarens Böhme, 1985 -- valid
  Chamaeleo calyptratus A. M. C. Duméril and A. H. A. Duméril, 1851 -- valid -- Cone-headed Chameleon, Veiled Chameleon, Yemen Chameleon
  Chamaeleo camerunensis L. Müller, 1909 -- invalid
  Chamaeleo chamaeleon (Linnaeus, 1758) -- valid
  Chamaeleo chapini de Witte, 1964 -- invalid
  Chamaeleo conirostratus Tilbury, 1998 -- invalid
  Chamaeleo cristatus Stutchbury, 1837 -- invalid
  Chamaeleo deremensis Matschie, 1892 -- invalid
  Chamaeleo dilepis Leach, 1819 -- valid -- Flap-neck Chameleon, Flapneck Chameleon
  Chamaeleo eisentrauti Mertens, 1968 -- invalid
  Chamaeleo ellioti Günther, 1895 -- invalid
  Chamaeleo etiennei K. P. Schmidt, 1919 -- invalid
  Chamaeleo feae Boulenger, 1906 -- invalid
  Chamaeleo fuelleborni Tornier, 1900 -- invalid
  Chamaeleo goetzei Tornier, 1899 -- invalid
  Chamaeleo gracilis Hallowell, 1842 -- valid -- Graceful Chameleon
  Chamaeleo harennae Largen, 1995 -- invalid
  Chamaeleo hoehnelii Steindachner, 1891 -- invalid
  Chamaeleo incornutus Loveridge, 1932 -- invalid
  Chamaeleo ituriensis K. P. Schmidt, 1919 -- invalid
  Chamaeleo jacksonii Boulenger, 1896 -- invalid -- Jackson's Chameleon
  Chamaeleo johnstoni Boulenger, 1901 -- invalid
  Chamaeleo kinetensis K. P. Schmidt, 1943 -- invalid
  Chamaeleo laevigatus Gray, 1863 -- valid -- Smooth Chameleon
  Chamaeleo laterispinis Loveridge, 1932 -- invalid
  Chamaeleo marsabitensis Tilbury, 1991 -- invalid
  Chamaeleo melleri (Gray, 1865) -- invalid
  Chamaeleo mlanjensis Broadley, 1965 -- invalid
  Chamaeleo monachus Gray, 1865 -- valid -- Socotra Chameleon
  Chamaeleo montium Buchholz, 1874 -- invalid
  Chamaeleo namaquensis A. Smith, 1831 -- valid -- Namaqua Chameleon
  Chamaeleo narraioca Necas, Modry and Slapeta, 2003 -- invalid
  Chamaeleo oweni Gray, 1831 -- invalid
  Chamaeleo pfefferi Tornier, 1900 -- invalid
  Chamaeleo quadricornis Tornier, 1899 -- invalid
  Chamaeleo quilensis Bocage, 1866 -- invalid
  Chamaeleo roperi Boulenger, 1890 -- invalid
  Chamaeleo rudis Boulenger, 1906 -- invalid
  Chamaeleo ruspolii Boettger, 1893 -- invalid
  Chamaeleo schoutedeni Laurent, 1952 -- invalid
  Chamaeleo schubotzi Sternfeld, 1912 -- invalid
  Chamaeleo senegalensis Daudin, 1802 -- valid -- Senegal Chameleon
  Chamaeleo sternfeldi Rand, 1963 -- invalid
  Chamaeleo tempeli Tornier, 1899 -- invalid
  Chamaeleo tremperi Necas, 1994 -- invalid
  Chamaeleo werneri Tornier, 1899 -- invalid
  Chamaeleo wiedersheimi Nieden, 1910 -- invalid
  Chamaeleo zeylanicus Laurenti, 1768 -- valid -- Indian Chameleon
  Chamaeleonidae -- valid -- Chameleons
  Chamaeleoninae -- valid
  Charina Gray, 1849 -- valid -- Rosy Boas, Rubber Boas
  Charina bottae (Blainville, 1835) -- valid -- Northern Rubber Boa, Rubber Boa
  Charina bottae umbratica Klauber, 1943 -- invalid
  Charina bottae utahensis Van Denburgh, 1920 -- invalid
  Charina trivirgata (Cope, 1861) -- invalid -- Rosy Boa
  Chelidae Gray, 1825 -- valid -- Austro-American Side-necked Turtles, Snake-necked Turtles
  Chelodina Fitzinger, 1826 -- valid -- Snake-necked Turtles
  Chelodina expansa Gray, 1857 -- valid -- Broad-shelled Snake-necked Turtle, Giant Snake-necked Turtle
  Chelodina longicollis (Shaw, 1794) -- valid -- Common Snake-necked Turtle, Eastern Snake-necked Turtle
  Chelodina novaeguineae Boulenger, 1888 -- valid -- New Guinea Snake-necked Turtle
  Chelodina oblonga Gray, 1841 -- valid -- Northern Snake-necked Turtle
  Chelodina parkeri Rhodin and Mittermeier, 1976 -- valid -- Parker's Snake-necked Turtle
  Chelodina reimanni Philippen and Grossmann, 1990 -- valid -- Reimann's Snake-necked Turtle
  Chelodina rugosa Ogilby, 1890 -- invalid -- northern Australian snake-necked turtle, Northern Snake-necked Turtle
  Chelodina siebenrocki Werner, 1901 -- invalid -- Siebenrock's Snake-necked Turtle
  Chelodina steindachneri Siebenrock, 1914 -- valid -- Steindachner's Snake-necked Turtle
  Chelonia Brongniart, 1800 -- valid -- Green Sea Turtles
  Chelonia agassizii Bocourt, 1868 -- invalid -- Pacific green turtle
  Chelonia mydas (Linnaeus, 1758) -- valid -- common green sea turtle, Green Sea Turtle, Tortuga-marina verde-del Atlántico
  Chelonia mydas agassizii Bocourt, 1868 -- invalid
  Chelonia mydas mydas (Linnaeus, 1758) -- invalid
  Chelonia olivacea Eschscholtz, 1829 -- invalid
  Cheloniidae Oppel, 1811 -- valid -- marine turtles, modern sea turtles, Sea Turtles
  Chelus Duméril, 1805 -- valid -- Matamata Turtles
  Chelus fimbriata (Schneider, 1783) -- valid -- Matamata Turtle
  Chelydra Schweigger, 1812 -- valid -- common snapping turtles, Snapping Turtles
  Chelydra osceola Stejneger, 1918 -- invalid
  Chelydra serpentina (Linnaeus, 1758) -- valid -- chélydre serpentine, Common Snapping Turtle, North American Snapping Turtle, Snapping Turtle, Tortuga-lagarto común
  Chelydra serpentina osceola Stejneger, 1918 -- invalid -- Florida Snapping Turtle
  Chelydra serpentina serpentina (Linnaeus, 1758) -- invalid -- Common Snapping Turtle
  Chelydridae Gray, 1831 -- valid -- Snapping Turtles
  Chersina Gray, 1830 -- valid -- Bow-sprited Tortoises
  Chersina angulata (Schweigger, 1812) -- valid -- Angulate Tortoise, South African Bowsprit Tortoise
  Chersodromus Reinhardt, 1860 -- valid
  Chersodromus liebmanni Reinhardt, 1861 -- valid -- Culebra-corredora de Liebmann, Liebmann's Earth Runner
  Chersodromus rubriventris (Taylor, 1949) -- valid -- Culebra-corredora vientre rojo, Redbelly Earth Runner
  Chersydrus Cuvier, 1817 -- invalid
  Chilomeniscus Cope, 1860 -- valid -- Sand Snakes, Sandsnakes
  Chilomeniscus cinctus Cope, 1861 -- invalid -- Banded Sand Snake, Culebra-arenera bandada
  Chilomeniscus punctatissimus Van Denburgh and Slevin, 1921 -- invalid -- Culebra-arenera punteada
  Chilomeniscus savagei Cliff, 1954 -- valid -- Culebra-arenera de Cerralvo, Savage's Sand Snake
  Chilomeniscus stramineus Cope, 1860 -- valid -- Culebra-arenera manchada, Variable Sandsnake
  Chinemys Smith, 1931 -- invalid -- Chinese Pond Turtles
  Chinemys nigricans (Gray, 1834) -- invalid -- Red-necked Pond Turtle
  Chinemys reevesii (Gray, 1831) -- invalid -- Reeves' turtle, Three-keeled Pond Turtle
  Chionactis Cope, 1860 -- valid -- Shovel-nosed Snakes
  Chionactis occipitalis (Hallowell, 1854) -- valid -- Culebra-nariz de pala del oeste, Mohave Shovel-nosed Snake, Mojave Shovelnose Snake, Western Shovel-nosed Snake, Western Shovelnose Snake
  Chionactis palarostris (Klauber, 1937) -- valid -- Culebra-nariz de pala sonorense, Sonoran Shovel-nosed Snake, Sonoran Shovelnose Snake
  Chiropterotriton nasalis (Dunn, 1924) -- invalid
  Chitra Gray, 1844 -- valid -- Narrow-headed Softshell Turtle
  Chitra indica (Gray, 1830) -- valid -- Indian Narrow-headed Softshell Turtle, Narrow-headed Softshell Turtle
  Chrysemys Gray, 1844 -- valid -- Painted Turtles
  Chrysemys concinna (Le Conte, 1830) -- invalid
  Chrysemys concinna concinna (Le Conte, 1830) -- invalid
  Chrysemys dorsalis Agassiz, 1857 -- invalid -- Southern Painted Turtle
  Chrysemys floridana (Le Conte, 1830) -- invalid
  Chrysemys floridana floridana (Le Conte, 1830) -- invalid
  Chrysemys marginata Agassiz, 1857 -- invalid
  Chrysemys picta (Schneider, 1783) -- valid -- Eastern Painted Turtle, Painted Turtle, tortue peinte, Tortuga pintada
  Chrysemys picta bellii (Gray, 1830) -- valid -- Western Painted Turtle
  Chrysemys picta dorsalis Agassiz, 1857 -- valid -- Southern Painted Turtle
  Chrysemys picta marginata Agassiz, 1857 -- valid -- Midland Painted Turtle
  Chrysemys picta picta (Schneider, 1783) -- valid -- Eastern Painted Turtle
  Chrysemys rubriventris (Le Conte, 1830) -- invalid
  Chrysemys rubriventris bangsi (Babcock, 1937) -- invalid
  Chrysemys rubriventris rubriventris (Le Conte, 1830) -- invalid
  Chrysemys scripta (Thunberg in Schoepff, 1792) -- invalid -- Slider, tortue à oreilles rouges
  Chrysemys scripta elegans (Wied-Neuwied, 1839) -- invalid
  Chrysemys scripta scripta (Thunberg in Schoepff, 1792) -- invalid
  Chrysemys scripta troostii (Holbrook, 1836) -- invalid
  Cinosternon hirtipes Wagler, 1830 -- invalid
  Cinosternum steindachneri Siebenrock, 1906 -- invalid
  Claudius Cope, 1865 -- valid -- Narrow-bridged Musk Turtles
  Claudius angustatus Cope, 1865 -- valid -- Narrow-bridged Musk Turtle, Tortuga-almizclera chopontil
  Clelia scytalina (Cope, 1867) -- valid -- Culebra-viborera mexicana, Mexican Snake Eater
  Clemmys Ritgen, 1828 -- valid -- marsh turtles, pond turtles, Spotted Turtles
  Clemmys guttata (Schneider, 1792) -- valid -- Spotted Turtle, tortue ponctuée
  Clemmys insculpta (Le Conte, 1830) -- invalid -- ornate box turtle, tortue des bois, wood turtle
  Clemmys marmorata (Baird and Girard, 1852) -- invalid -- Pacific pond turtle, Tortuga marmoleada, western pond turtle
  Clemmys marmorata marmorata (Baird and Girard, 1852) -- invalid -- northern Pacific pond turtle, northwestern pond turtle
  Clemmys marmorata pallida Seeliger, 1945 -- invalid -- southern Pacific pond turtle, southwestern pond turtle
  Clemmys muhlenbergii (Schoepff, 1801) -- invalid -- bog turtle
  Clonophis Cope, 1889 -- valid -- Kirtland's Snakes
  Clonophis kirtlandii (Kennicott, 1856) -- valid -- Kirtland's Snake
  Cnemidophorus Wagler, 1830 -- valid -- Racerunners, Whiptails
  Cnemidophorus alpinus Maslin and Walker, 1965 -- invalid -- Alpine Whiptail, Corredora Alpina, Huico alpino
  Cnemidophorus angusticeps Cope, 1878 -- invalid -- Huico yucateco
  Cnemidophorus arizonae Van Denburgh, 1896 -- invalid -- Arizona Striped Whiptail
  Cnemidophorus bacatus Van Denburgh and Slevin, 1921 -- invalid -- Huico de Nolasco, Huico de San Pedro Nolasco, San Pedro Nolasco Whiptail
  Cnemidophorus burti Taylor, 1938 -- invalid -- Canyon Spotted Whiptail, Huico de cañón o punteado de cañón
  Cnemidophorus calidipes Duellman, 1955 -- invalid -- Huico de Tepalcatepec
  Cnemidophorus canus Van Denburgh and Slevin, 1921 -- invalid -- Huico de la Isla Salsipuedes, Huico de Salsipuedes, Isla Salsipuedas Whiptail
  Cnemidophorus catalinensis Van Denburgh and Slevin, 1921 -- invalid -- Huico de Santa Catalina
  Cnemidophorus celeripes Dickerson, 1919 -- invalid -- Huico de San José
  Cnemidophorus ceralbensis (Van Denburgh and Slevin, 1921) -- invalid -- Huico de Cerralbo
  Cnemidophorus communis Cope, 1878 -- invalid -- Huico Moteado-gigante
  Cnemidophorus costatus Cope, 1878 -- invalid -- Huico del Oeste-mexicano
  Cnemidophorus cozumela Gadow, 1906 -- invalid -- Huico de Cozumel
  Cnemidophorus deppii Wiegmann, 1834 -- invalid -- Huico siete líneas
  Cnemidophorus dixoni Scudday, 1973 -- invalid -- Gray-checkered Whiptail
  Cnemidophorus estebanensis Dickerson, 1919 -- invalid -- Huico de San Esteban
  Cnemidophorus exsanguis Lowe, 1956 -- invalid -- Chihuahuan Spotted Whiptail, Huico chihuahuense
  Cnemidophorus flagellicaudus Lowe and Wright, 1964 -- invalid -- Gila Spotted Whiptail
  Cnemidophorus gracilis Baird and Girard, 1852 -- invalid
  Cnemidophorus grahamii Baird and Girard, 1852 -- invalid -- Bold Checkered Whiptail
  Cnemidophorus gularis Baird and Girard, 1852 -- invalid -- Huico Texano, Texas Spotted Whiptail
  Cnemidophorus gularis gularis Baird and Girard, 1852 -- invalid -- Texas Spotted Whiptail
  Cnemidophorus guttatus Wiegmann, 1834 -- invalid -- Huico picuiliche
  Cnemidophorus hyperythrus Cope, 1863 -- invalid -- Huico Garganta Anaranjada, Orange-throated Whiptail
  Cnemidophorus innotatus Burger, 1950 -- invalid -- Colorado Plateau Spotted Whiptail, Plateau Spotted Whiptail
  Cnemidophorus inornatus Baird, 1859 -- invalid -- Huico adornado, Little Striped Whiptail
  Cnemidophorus labialis Stejneger, 1890 -- invalid -- Huico de Baja California
  Cnemidophorus laredoensis McKinney, Kay and Anderson, 1973 -- invalid -- Huico de Laredo, Laredo Striped Whiptail
  Cnemidophorus lemniscatus (Linnaeus, 1758) -- valid -- Rainbow Lizard, Rainbow Whiptail, South American Whiptail
  Cnemidophorus lineattissimus Cope, 1878 -- invalid -- Huico muchas líneas
  Cnemidophorus marmoratus Baird and Girard, 1852 -- invalid -- Marbled Whiptail
  Cnemidophorus marmoratus marmoratus Baird and Girard, 1852 -- invalid -- Western Marbled Whiptail
  Cnemidophorus marmoratus reticuloriens Hendricks and Dixon, 1986 -- invalid
  Cnemidophorus martyris Stejneger, 1891 -- invalid -- Huico de San Pedro Mártir
  Cnemidophorus maximus Cope, 1863 -- invalid -- Huico del Cabo
  Cnemidophorus mexicanus Peters, 1869 -- invalid -- Huico mexicano
  Cnemidophorus motaguae Sackett, 1941 -- invalid -- Giant Whiptail, Huico gigante
  Cnemidophorus neomexicanus Lowe and Zweifel, 1952 -- invalid -- Huico de Nuevo México, New Mexican Whiptail, New Mexico Whiptail
  Cnemidophorus opatae Wright, 1967 -- invalid -- Huico opata
  Cnemidophorus parvisocius Zweifel, 1960 -- invalid -- Huico pigmeo
  Cnemidophorus rodecki McCoy and Maslin, 1962 -- invalid -- Huico de Rodeck
  Cnemidophorus sackii Wiegmann, 1834 -- invalid
  Cnemidophorus septemvittatus Cope, 1892 -- invalid -- Mexican Plateau Spotted Whiptail, Plateau Striped Whiptail
  Cnemidophorus sexlineatus (Linnaeus, 1766) -- invalid -- Six-lined Racerunner
  Cnemidophorus sonorae Lowe and Wright, 1964 -- invalid -- Huico de Sonora, Sonoran Spotted Whiptail
  Cnemidophorus tesselatus (Say in James, 1823) -- invalid -- Checkered Whiptail, Colorado Checkered Whiptail, Common Checkered Whiptail, Huico de cuadros
  Cnemidophorus tigris Baird and Girard, 1852 -- invalid -- Huico occidental, Western Whiptail
  Cnemidophorus tigris marmoratus Baird and Girard, 1852 -- invalid
  Cnemidophorus uniparens Wright and Lowe, 1965 -- invalid -- Desert Grassland Whiptail, Huico de pastizal-desértico
  Cnemidophorus velox Springer, 1928 -- invalid -- Plateau Striped Whiptail
  Cnemidophorus xanthonotus Duellman and Lowe, 1953 -- invalid -- Red-back Whiptail, Red-backed Whiptail
  Cochranella ritae (Lutz in Lutz and Kloss, 1952) -- invalid
  Coleonyx Gray, 1845 -- valid -- Banded Geckos
  Coleonyx brevis Stejneger, 1893 -- valid -- Cuija texana, Texas Banded Gecko
  Coleonyx fasciatus (Boulenger, 1885) -- valid -- Cuija negra
  Coleonyx reticulatus Davis and Dixon, 1958 -- valid -- Big Bend gecko, Cuija reticulada, Reticulate Banded Gecko, Reticulated Gecko
  Coleonyx switaki (Murphy, 1974) -- valid -- Barefoot Gecko, Cuija descalza, Switak's Banded Gecko
  Coleonyx variegatus (Baird, 1859) -- valid -- Cuija occidental, Western Banded Gecko
  Coluber Linnaeus, 1758 -- valid -- Racers
  Coluber constrictor Linnaeus, 1758 -- valid -- Culebra-corredora constrictor, Eastern Racer, North American Racer, Racer
  Coluber erythrogrammus Daudin, 1803 -- invalid
  Coluber infernalis Blainville, 1835 -- invalid
  Coluber mormon Baird and Girard, 1852 -- invalid -- Western Yellow-bellied Racer
  Colubridae Oppel, 1811 -- valid -- Colubrids, Typical Snakes
  Coniophanes Hallowell in Cope, 1860 -- valid -- Black-striped Snakes
  Coniophanes alvarezi Campbell, 1989 -- valid -- Chiapan Stripeless Snake, Culebra sin rayas-chiapaneca
  Coniophanes bipunctatus (Günther, 1858) -- valid -- Culebra dos puntos, Two-spotted Snake
  Coniophanes fissidens (Günther, 1858) -- valid -- Culebra vientre amarillo, Yellowbelly Snake
  Coniophanes imperialis (Kennicott in Baird, 1859) -- valid -- Black-striped Snake, Culebra rayas negras, Regal Black-striped Snake
  Coniophanes lateritius Cope, 1862 -- valid -- Culebra sin rayas, Stripeless Snake
  Coniophanes meridanus Schmidt and Andrews, 1936 -- valid -- Culebra sin rayas-peninsular, Peninsula Stripeless Snake
  Coniophanes piceivittis Cope, 1869 -- valid -- Cope's Black-striped Snake, Culebra rayada-de Cope
  Coniophanes quinquevittatus (A. M. C. Duméril, Bibron and A. H. A. Duméril, 1854) -- valid -- Culebra rayada-escofinada, Fife-striped Snake
  Conophis Peters, 1860 -- valid
  Conophis lineatus (A. M. C. Duméril, Bibron and A. H. A. Duméril, 1854) -- valid -- Culebra-guardacaminos lineada, Road Guarder
  Conophis pulcher Cope, 1869 -- invalid -- Culebra-guardacaminos hermosa
  Conophis vittatus Peters, 1860 -- valid -- Culebra-guardacaminos rayada, Striped Road Guarder
  Conopsis Günther, 1858 -- valid
  Conopsis biserialis (Taylor and H. M. Smith, 1942) -- valid -- Culebra-terrestre dos líneas, Two-lined Mexican Earth Snake
  Conopsis nasus Günther, 1858 -- valid -- Culebra-terrestre narigona, Largenose Earth Snake
  Contia Baird and Girard, 1853 -- valid -- Sharp-tailed Snakes
  Contia tenuis (Baird and Girard, 1852) -- valid -- Common Sharp-tailed Snake, Sharp-tailed Snake, Sharptail Snake
  Cophosaurus Troschel, 1852 -- valid -- Greater Earless Lizards
  Cophosaurus texanus Troschel, 1852 -- valid -- Greater Earless Lizard, Lagartija-sorda mayor, Texas Greater Earless Lizard
  Cophosaurus texanus texanus Troschel, 1852 -- valid -- Texas Earless Lizard
  Corytophanes F. Boie in Schlegel, 1826 -- valid
  Corytophanes cristatus (Merrem, 1821) -- valid -- Smooth Helmeted Iguana, Turipache cabeza lisa
  Corytophanes hernandezii (Wiegmann, 1831) -- invalid
  Corytophanes percarinatus A. H. A. Duméril, 1856 -- valid -- Keeled Helmeted Basilisk, Keeled Helmeted Iguana, Turipache aquillado
  Corytophanidae -- valid -- Helmet Lizards
  Crocodilia -- valid -- alligators, caimans, crocodiles, Crocodilians, crocodilo, gavials, jacaré
  Crocodilus floridanus Hornaday, 1875 -- invalid
  Crocodilus mississipiensis Daudin, 1802 -- invalid
  Crocodylia -- invalid
  Crocodylidae -- valid -- Crocodiles
  Crocodylus Laurenti, 1768 -- valid -- Crocodiles
  Crocodylus acutus Cuvier, 1807 -- valid -- American Crocodile, caiman de la costa, Central American Alligator, cocodrilo, Cocodrilo americano, lagarto
  Crocodylus cataphractus Cuvier, 1825 -- invalid
  Crocodylus intermedius Graves, 1819 -- valid -- Orinoco Crocodile
  Crocodylus johnsoni Krefft, 1873 -- valid -- Australian Freshwater Crocodile, Freshie, Freshwater Crocodile, Johnson's Crocodile, Johnston's Crocodile, Johnstone River Crocodile, Johnstone's Crocodile
  Crocodylus johnstoni Krefft, 1873 -- invalid
  Crocodylus mindorensis Schmidt, 1935 -- valid -- Mindoro Crocodile, Philippine Crocodile, Philippine Freshwater Crocodile
  Crocodylus moreletii Duméril and Bibron, 1851 -- valid -- Belize Crocodile, Central American Crocodile, Cocodrilo de Moreleti, Morelet's Crocodile
  Crocodylus niloticus Laurenti, 1768 -- valid -- Mamba, Nile Crocodile
  Crocodylus novaeguineae Schmidt, 1928 -- valid -- New Guinea Crocodile, New Guinea Freshwater Crocodile
  Crocodylus novaeguineae mindorensis Schmidt, 1935 -- invalid
  Crocodylus novaeguineae novaeguineae Schmidt, 1928 -- invalid
  Crocodylus palustris Lesson, 1831 -- valid -- Marsh Crocodile, Muggar, Mugger Crocodile, Swamp Crocodile
  Crocodylus palustris kimbula Deraniyagala, 1936 -- invalid -- Ceylon Mugger Crocodile
  Crocodylus palustris palustris Lesson, 1831 -- invalid -- Mugger Crocodile
  Crocodylus porosus Schneider, 1801 -- valid -- Estuarine Crocodile, Saltie, Saltwater Crocodile
  Crocodylus rhombifer Cuvier, 1807 -- valid -- Cuban Crocodile
  Crocodylus siamensis Schneider, 1801 -- valid -- Siamese Crocodile, Siamese Freshwater Crocodile
  Crossodactylus dispar Lutz, 1925 -- valid
  Crotalinae Oppel, 1811 -- valid
  Crotalus Linnaeus, 1758 -- valid -- Rattlesnakes
  Crotalus adamanteus Palisot de Beauvois, 1799 -- valid -- Eastern Diamond-backed Rattlesnake, Eastern Diamondback Rattlesnake
  Crotalus aquilus Klauber, 1952 -- valid -- Queretaran Dusky Rattlesnake
  Crotalus atrox Baird and Girard, 1853 -- valid -- Víbora-cascabel de diamantes, Western Diamond-backed Rattlesnake, Western Diamondback Rattlesnake
  Crotalus basiliscus (Cope, 1864) -- valid -- Víbora-cascabel de Saye
  Crotalus catalinensis Cliff, 1954 -- valid -- Víbora-cascabel muda
  Crotalus cerastes Hallowell, 1854 -- valid -- Sidewinder, Víbora-cascabel cornuda
  Crotalus durissus unicolor Van Lidth de Jeude, 1887 -- valid -- Aruba Island Rattlesnake
  Crotalus durissus vegrandis Klauber, 1941 -- invalid
  Crotalus enyo (Cope, 1861) -- valid -- Baja California Rattlesnake, Lower California Rattlesnake, Víbora-cascabel bajacaliforniana
  Crotalus exsul Garman, 1884 -- invalid -- Red Diamond Rattlesnake, Víbora-cascabel de Isla Cedros
  Crotalus horridus Linnaeus, 1758 -- valid -- crotale des bois, Timber Rattlesnake
  Crotalus intermedius Troschel, 1865 -- valid -- Mexican Smallhead Rattlesnake, Víbora-cascabel enana
  Crotalus lannomi Tanner, 1966 -- valid -- Autlán Long-tailed Rattlesnake, Manantlán Long-tailed Rattlesnake, Víbora-cascabel de Autlán
  Crotalus lepidus (Kennicott, 1861) -- valid -- Rock Rattlesnake, Víbora-cascabel variable
  Crotalus mitchellii (Cope, 1861) -- valid -- Speckled Rattlesnake
  Crotalus molossus Baird and Girard, 1853 -- valid -- Black-tailed Rattlesnake, Víbora-cascabel cola negra, Western Black-tailed Rattlesnake
  Crotalus polystictus (Cope, 1865) -- valid -- Mexican Lancehead Rattlesnake, Víbora-cascabel ocelada
  Crotalus pricei Van Denburgh, 1895 -- valid -- Twin-spotted Rattlesnake, Víbora-cascabel motas gemelas
  Crotalus pusillus Klauber, 1952 -- valid -- Tancitaran Dusky Rattlesnake, Víbora-cascabel de Tancítaro
  Crotalus scutulatus (Kennicott, 1861) -- valid -- Green Rattlesnake, Mohave Rattlesnake, Mojave Rattlesnake, Víbora-cascabel del Altiplano
  Crotalus simus Latreille in Sonnini and Latreille, 1801 -- valid -- Middle American Rattlesnake
  Crotalus stejnegeri Dunn, 1919 -- valid -- Sinaloan Long-tailed Rattlesnake, Víbora-cascabel cola larga
  Crotalus tigris Kennicott, 1859 -- valid -- Tiger Rattlesnake, Víbora-cascabel tigre
  Crotalus tortugensis Van Denburgh and Slevin, 1921 -- invalid -- Tortuga Island Rattlesnake, Víbora-cascabel de Isla Tortuga
  Crotalus transversus Taylor, 1944 -- valid -- Cross-banded Mountain Rattlesnake, Víbora-cascabel bandas cruzadas
  Crotalus triseriatus (Wagler, 1830) -- valid -- Central Plateau Dusky Rattlesnake, Víbora-cascabel transvolcánica, Western Dusky Rattlesnake
  Crotalus viridis (Rafinesque, 1818) -- valid -- Prairie Rattlesnake, Víbora-cascabel occidental, Western Rattlesnake
  Crotalus willardi Meek, 1905 -- valid -- Ridge-nosed Rattlesnake, Víbora-cascabel bigotuda
  Crotaphytidae -- valid -- Collared Lizards, Leopard Lizards
  Crotaphytus Holbrook, 1842 -- valid -- Collared Lizards
  Crotaphytus collaris (Say in James, 1823) -- valid -- Collared Lizard, Eastern Collared Lizard, Lagartija-de collar común
  Crotaphytus nebrius R. W. Axtell and Montanucci, 1977 -- valid -- Sonoran Collared Lizard
  Crotaphytus reticulatus Baird, 1859 -- valid -- Lagartija-de collar reticulada, Reticulate Collared Lizard
  Crotaphytus vestigium N. M. Smith and Tanner, 1972 -- valid -- Baja Black-collared Lizard, Baja California Collared Lizard
  Cryophis Bogert and Duellman, 1963 -- valid
  Cryophis hallbergi Bogert and Duellman, 1963 -- valid -- Culebra-de nebklina de Hallberg, Hallberg's Cloud Forest Snake
  Cryptoblepharus Wiegmann, 1834 -- valid -- Snake-eyed Skinks
  Cryptoblepharus boutonii (Desjardin, 1831) -- valid -- Snake-eyed Skink
  Cryptoblepharus boutonii poecilopleurus (Wiegmann, 1836) -- invalid
  Cryptoblepharus poecilopleurus (Wiegmann, 1836) -- valid -- Mottled Snake-eyed Skink, Oceanic Snake-eyed Skink, Pacific Snake-eyed Skink
  Cryptobranchidae Fitzinger, 1826 -- valid -- Giant Salamanders, Hellbenders
  Cryptobranchus Leuckart, 1821 -- valid -- Giant Salamanders, Hellbenders
  Cryptobranchus alleganiensis (Sonnini de Manoncourt and Latreille, 1801) -- valid -- Hellbender
  Cryptotriton García-París and Wake, 2000 -- valid
  Cryptotriton adelos (Papenfuss and Wake, 1987) -- invalid
  Cryptotriton alvarezdeltoroi (Papenfuss and Wake, 1987) -- valid
  Cryptotriton monzoni (Campbell and Smith, 1998) -- valid
  Cryptotriton nasalis (Dunn, 1924) -- valid
  Cryptotriton veraepacis (Lynch and Wake, 1978) -- valid
  Cryptotriton wakei (Campbell and Smith, 1998) -- invalid
  Ctenonotus Fitzinger, 1843 -- invalid -- Eastern Antillean Anoles, Eastern Antillian Anoles
  Ctenonotus acutus (Hallowell, 1857) -- invalid -- St. Croix Anole
  Ctenonotus cooki (Grant, 1931) -- invalid -- Cook's Anole
  Ctenonotus cristatellus (A. M. C. Duméril and Bibron, 1837) -- invalid -- Crested Anole
  Ctenonotus cybotes (Cope, 1862) -- invalid -- Large-headed Anole
  Ctenonotus desechensis (Heatwole, 1976) -- invalid -- Desecheo Anole
  Ctenonotus distichus (Cope, 1861) -- invalid -- Bark Anole
  Ctenonotus evermanni (Stejneger, 1904) -- invalid -- Emerald Anole
  Ctenonotus gundlachi (W. C. H. Peters, 1876) -- invalid -- Yellow-bearded Anole
  Ctenonotus krugi (W. C. H. Peters, 1876) -- invalid -- Upland Grass Anole
  Ctenonotus monensis (Stejneger, 1904) -- invalid -- Mona Anole
  Ctenonotus poncensis (Stejneger, 1904) -- invalid -- Dryland Grass Anole
  Ctenonotus pulchellus (A. M. C. Duméril and Bibron, 1837) -- invalid -- Common Grass Anole
  Ctenonotus stratulus (Cope, 1861) -- invalid -- Barred Anole
  Ctenosaura Wiegmann, 1828 -- valid -- Spiny-tailed Iguanas
  Ctenosaura acanthura (Shaw, 1802) -- valid -- Iguana-espinosa del Golfo, Northeastern Spinytail Iguana, Veracruz Spiny-tailed Iguana
  Ctenosaura clarki Bailey, 1928 -- valid -- Balsas Armed Lizard, Balsas Spiny-tailed Iguana, Garrobo del Balsas
  Ctenosaura defensor (Cope, 1866) -- valid -- Garrobo yucateco, Yucatán Spiny-tailed Iguana, Yucatán Spinytail Iguana
  Ctenosaura hemilopha (Cope, 1863) -- valid -- Baja California Spiny-tailed Iguana, Cape Spinytail Iguana, Iguana-espinosa de Sonora, Short-crested Spiny-tailed Iguana
  Ctenosaura pectinata (Wiegmann, 1834) -- valid -- Guerreran Spiny-tailed Iguana, Iguana-espinosa mexicana, Mexican Spiny-tailed Iguana, Spiny-tailed Iguana, Western Spiny-tailed Iguana
  Ctenosaura quinquecarinata (Gray, 1842) -- valid -- Five-keeled Spiny-tailed Iguana, Garrobo oaxaqueño, Oaxacan Spinytail Iguana
  Ctenosaura similis (Gray, 1831) -- valid -- Black Iguana, Black Spiny-tailed Iguana, Common Spiny-tailed Iguana, Iguana-espinosa rayada
  Cuora Gray, 1856 -- valid -- Asian box turtles
  Cuora amboinensis (Riche in Daudin, 1801) -- valid -- Southeast Asian Box Turtle
  Cuora aurocapitata Luo and Zong, 1988 -- valid -- Yellow-headed Box Turtle
  Cuora flavomarginata (Gray, 1863) -- valid -- Yellow-margined Box Turtle
  Cuora galbinifrons Bourret, 1940 -- valid -- Indochinese Box Turtle
  Cuora mccordi Ernst, 1988 -- valid -- McCord's Box Turtle
  Cuora pani Song, 1984 -- valid -- Pan's Box Turtle
  Cuora trifasciata (Bell, 1825) -- valid -- Chinese Three-striped Box Turtle, Golden Coin Turtle
  Cuora yunnanensis (Boulenger, 1906) -- valid -- Yunnan Box Turtle
  Cuora zhoui Zhao in Zhao, Zhou and Ye, 1990 -- valid -- Zhou's Box Turtle
  Cyclanorbis Gray, 1854 -- valid -- Sub-Saharan flapshell turtles
  Cyclanorbis elegans (Gray, 1869) -- valid -- Nubian Flapshell Turtle
  Cyclanorbis senegalensis (Duméril and Bibron, 1835) -- valid -- Senegal Flapshell Turtle
  Cyclemys Bell, 1834 -- valid -- Asian Leaf Turtles
  Cyclemys dentata (Gray, 1831) -- valid -- Asian Leaf Turtle
  Cyclemys tcheponensis (Bourret, 1939) -- invalid -- Stripe-necked Leaf Turtle
  Cycloderma Peters, 1854 -- valid -- Central African Flapshell Turtles
  Cycloderma aubryi (Duméril, 1856) -- valid -- Aubry's Flapshell Turtle
  Cycloderma frenatum Peters, 1854 -- valid -- Zambezi Flapshell Turtle
  Cyclura Harlan, 1825 -- valid -- Ground Iguanas, Rock Iguanas
  Cyclura cornuta (Bonnaterre, 1789) -- valid -- Hispaniolan Rhinoceros Iguana, Horned Ground Iguana, Rhinoceros Iguana
  Cyclura nubila (Gray, 1831) -- valid -- Cayman Islands Ground Iguana, Clouded Rock Iguana, Cuban Ground Iguana, Cuban Iguana
  Cyrtopodion Fitzinger, 1843 -- valid -- Bow-fingered Geckos, Bow-footed Geckos, Bowfoot Geckos
  Cyrtopodion scabrum (Heyden in Rüppell, 1827) -- valid -- Rough-tailed Gecko
  Daboia Gray, 1842 -- valid
  Dactyloa Wagler, 1830 -- invalid -- South American Anoles
  Dactyloa richardii (A. M. C. Duméril and Bibron, 1837) -- invalid
  Deinagkistrodon Gloyd, 1979 -- valid
  Deirochelys Agassiz, 1857 -- valid -- Chicken Turtles
  Deirochelys reticularia (Latreille in Sonnini and Latreille, 1801) -- valid -- Chicken Turtle
  Deirochelys reticularia chrysea Schwartz, 1956 -- valid -- Florida Chicken Turtle
  Deirochelys reticularia miaria Schwartz, 1956 -- valid -- Western Chicken Turtle
  Deirochelys reticularia reticularia (Latreille in Sonnini and Latreille, 1801) -- valid -- Eastern Chicken Turtle
  Dendrelaphis Boulenger, 1890 -- valid -- Asian Tree Snakes, Bronzebacks
  Dendrelaphis punctulatus (Gray, 1826) -- valid -- Common Bronzeback, Common Tree Snake, Green Tree Snake
  Dendrobates Wagler, 1830 -- valid -- Dart-poison Frogs, Poison Dart Frogs, Poison-dart Frogs
  Dendrobates auratus (Girard, 1855) -- valid -- Dart Poison Frog, Green and Black Dart-poison Frog, Green and Black Poison Dart Frog, Green-and-black Poison Dart Frog
  Dendrobatidae Cope, 1865 -- valid -- Dart-poison Frogs, Dendrobatid Frogs, Dendrobatids, Poison Frogs, Poison-dart Frogs
  Dendrophidion Fitzinger, 1843 -- valid
  Dendrophidion vinitor H. M. Smith, 1941 -- valid -- Barred Forest Racer, Culebra-corredora barrada
  Dermatemydidae Gray, 1870 -- valid -- River Turtles
  Dermatemys Gray, 1847 -- valid -- Central American River Turtles
  Dermatemys mawii Gray, 1847 -- valid -- Central American River Turtle, Tortuga-riverina centroamericana
  Dermochelyidae Fitzinger, 1843 -- valid -- Leatherback Sea Turtles, leatherback turtles
  Dermochelys Blainville, 1816 -- valid -- Leatherback Sea Turtles
  Dermochelys coriacea (Vandelli, 1761) -- valid -- Leatherback, Leatherback Sea Turtle, leatherback turtle, tinglar, tortue luth, Tortuga-marina laúd
  Dermochelys coriacea coriacea (Vandelli, 1761) -- invalid -- Leatherback Turtle
  Dermochelys coriacea schlegelii (Garman, 1884) -- invalid
  Desmognathinae Gray, 1850 -- invalid -- Desmognathine Salamanders
  Desmognathus Baird, 1850 -- valid -- Dusky Salamanders, Seal Salamanders
  Desmognathus aeneus Brown and Bishop, 1947 -- valid -- Seepage Salamander
  Desmognathus apalachicolae Means and Karlin, 1989 -- valid -- Apalachicola Dusky Salamander
  Desmognathus auriculatus (Holbrook, 1838) -- valid -- Holbrook's Southern Dusky Salamander, Southern Dusky Salamander
  Desmognathus brimleyorum Stejneger, 1895 -- valid -- Ouachita Dusky Salamander, Ouachita Salamander
  Desmognathus carolinensis Dunn, 1916 -- valid -- Carolina Mountain Dusky Salamander
  Desmognathus fuscus (Rafinesque, 1820) -- valid -- Dusky Salamander, Northern Dusky Salamander, salamandre sombre du nord
  Desmognathus imitator Dunn, 1927 -- valid -- Imitator Salamander
  Desmognathus marmoratus (Moore, 1899) -- valid -- Shovel-nosed Salamander
  Desmognathus monticola Dunn, 1916 -- valid -- Seal Salamander
  Desmognathus ochrophaeus Cope, 1859 -- valid -- Allegheny Mountain Dusky Salamander, Mountain Dusky Salamander, salamandre des montagnes
  Desmognathus ocoee Nicholls, 1949 -- valid -- Ocoee Salamander
  Desmognathus orestes Tilley and Mahoney, 1996 -- valid -- Blue Ridge Dusky Salamander
  Desmognathus quadramaculatus (Holbrook, 1840) -- valid -- Black-bellied Salamander
  Desmognathus santeetlah Tilley, 1981 -- valid -- Santeetlah Dusky Salamander, Yellow Dusky Salamander
  Desmognathus welteri Barbour, 1950 -- valid -- Black Mountain Salamander
  Desmognathus wrighti King, 1936 -- valid -- Pygmy Salamander
  Diadophis Baird and Girard, 1853 -- valid -- Ring-necked Snakes
  Diadophis punctatus (Linnaeus, 1766) -- valid -- couleuvre à collier, Culebra de collar, Ring-necked Snake, Ringneck Snake
  Diapsida -- invalid
  Dicamptodon Strauch, 1870 -- valid -- Pacific Giant Salamanders
  Dicamptodon aterrimus (Cope, 1868) -- valid -- Idaho Giant Salamander
  Dicamptodon copei Nussbaum, 1970 -- valid -- Cope's Giant Salamander
  Dicamptodon ensatus (Eschscholtz, 1833) -- valid -- California Giant Salamander
  Dicamptodon tenebrosus (Baird and Girard, 1852) -- valid -- Coastal Giant Salamander, Pacific Giant Salamander
  Dicamptodontidae Tihen, 1958 -- invalid -- Giant Salamanders, Olympic Salamanders, Pacific Giant Salamanders
  Diploglossus Wiegmann, 1834 -- valid -- Galliwasps
  Diploglossus pleii Duméril and Bibron, 1839 -- valid -- Puerto Rican Galliwasp
  Dipsas Laurenti, 1768 -- valid
  Dipsas brevifacies (Cope, 1866) -- valid -- Culebra-caracolera chata, Snail-eating Thirst Snake
  Dipsas gaigeae (Oliver, 1937) -- valid -- Culebra-caracolera de Gaige, Gaige's Thirst Snail-eater
  Dipsosaurus Hallowell, 1854 -- valid -- Desert Iguanas
  Dipsosaurus dorsalis (Baird and Girard, 1852) -- valid -- Common Desert Iguana, Desert Iguana, Iguana de desierto
  Dogania Gray, 1844 -- valid -- Malayan Softshell Turtles
  Dogania subplana (Geoffroy Saint-Hilaire, 1809) -- valid -- Malayan Softshell Turtle
  Dryadophis Stuart, 1938 -- invalid
  Dryadophis cliftoni Hardy, 1964 -- invalid -- Culebra-lagartijera de Clifton
  Dryadophis melanolomus (Cope, 1868) -- invalid -- Culebra-lagartijera común
  Drymarchon Fitzinger, 1843 -- valid -- Indigo Snakes
  Drymarchon corais (F. Boie, 1827) -- valid -- Indigo Snake, Yellow-tail Cribo
  Drymobius Fitzinger, 1843 -- valid -- Neotropical Racers
  Drymobius chloroticus (Cope, 1886) -- valid -- Culebra-corredora verdosa, Green Highland Racer
  Drymobius margaritiferus (Schlegel, 1837) -- valid -- Central American Speckled Racer, Culebra-corredora de Petatillos, Speckled Racer
  Echis Merrem, 1820 -- valid
  Elaphe Fitzinger in Wagler, 1833 -- valid -- Corn Snakes, Fox Snakes, Rat Snakes, Ratsnakes
  Elaphe bairdi (Yarrow, 1880) -- invalid -- Baird's Rat Snake, Baird's Ratsnake, Culebra-ratonera de Baird
  Elaphe flavirufa (Cope, 1867) -- invalid -- Culebra-ratonera tropical
  Elaphe guttata (Linnaeus, 1766) -- invalid -- Corn Snake, Cornsnake, Culebra-ratonera de maiz
  Elaphe obsoleta (Say in James, 1823) -- invalid -- Texas Ratsnake
  Elaphe phaescens Dowling, 1952 -- invalid -- Culebra-ratonera yucateca
  Elaphe vulpina (Baird and Girard, 1853) -- invalid
  Elapidae F. Boie, 1827 -- valid -- Cobras, Coral Snakes, Coralsnakes, Elapids, Kraits
  Elaps balzani Boulenger, 1898 -- invalid
  Eleutherodactylus Duméril and Bibron, 1841 -- valid -- Chirping Frogs, Coquis, Eleuths, Rain Frogs, Rainfrogs, Robber Frogs
  Eleutherodactylus anonymus (Lutz, 1927) -- invalid
  Eleutherodactylus antillensis (Reinhardt and Lütken, 1863) -- valid -- Antillean Coqui, Antillean Frog
  Eleutherodactylus augusti (Dugès in Brocchi, 1879) -- invalid -- Barking Frog, Rana-ladradora común
  Eleutherodactylus bolbodactylus (Lutz, 1925) -- invalid
  Eleutherodactylus brittoni Schmidt, 1920 -- valid -- Grass Coqui
  Eleutherodactylus carvalhoi Lutz in Lutz and Kloss, 1952 -- invalid
  Eleutherodactylus cochranae Grant, 1932 -- valid -- Whistling Coqui, Whistling Frog
  Eleutherodactylus cooki Grant, 1932 -- valid -- Cook's Robber Frog, Rock Coqui, Rock Frog
  Eleutherodactylus coqui Thomas, 1966 -- valid -- Common Coqui, Coqui, Coquí
  Eleutherodactylus cystignathoides (Cope, 1877) -- valid -- Rana-chirriadora mexicana, Rio Grande Chirping Frog
  Eleutherodactylus eneidae Rivero, 1959 -- valid -- Mottled Coqui, Mottled Frog
  Eleutherodactylus gryllus Schmidt, 1920 -- valid -- Cricket Coqui
  Eleutherodactylus guttilatus (Cope, 1879) -- valid -- Rana-chirriadora punteada, Spotted Chirping Frog
  Eleutherodactylus hedricki Rivero, 1963 -- valid -- Tree-hole Coqui, Tree-hole Frog
  Eleutherodactylus hoehnei Lutz, 1958 -- invalid
  Eleutherodactylus incertus (Lutz, 1927) -- invalid
  Eleutherodactylus jasperi Drewry and Jones, 1976 -- valid -- Golden Coqui
  Eleutherodactylus karlschmidti Grant, 1931 -- valid -- Web-footed Coqui
  Eleutherodactylus lentus (Cope, 1862) -- valid -- Mute Coqui, Mute Frog
  Eleutherodactylus locustus Schmidt, 1920 -- valid -- Warty Coqui
  Eleutherodactylus marnockii (Cope, 1878) -- valid -- Cliff Chirping Frog
  Eleutherodactylus monensis (Meerwarth, 1901) -- valid -- Mona Coqui
  Eleutherodactylus nasutus (Lutz, 1925) -- invalid
  Eleutherodactylus oxyrhynchus (Duméril and Bibron, 1841) -- invalid
  Eleutherodactylus oxyrhyncus (Duméril and Bibron, 1841) -- valid
  Eleutherodactylus planirostris (Cope, 1862) -- valid -- Greenhouse Frog, Rana-ladrona de invernadero
  Eleutherodactylus portoricensis Schmidt, 1927 -- valid -- Forest Coqui, Puerto Rican Coqui
  Eleutherodactylus richmondi Stejneger, 1904 -- valid -- Ground Coqui
  Eleutherodactylus schwartzi Thomas, 1966 -- valid -- Virgin Islands Coqui
  Eleutherodactylus unicolor Stejneger, 1904 -- valid -- Burrowing Coqui
  Eleutherodactylus venancioi Lutz, 1958 -- invalid
  Eleutherodactylus wightmanae Schmidt, 1920 -- valid -- Wrinkled Coqui
  Elgaria Gray, 1838 -- valid -- Western Alligator Lizards
  Elgaria coerulea (Wiegmann, 1828) -- valid -- Northern Alligator Lizard
  Elgaria kingii Gray, 1838 -- valid -- Arizona Alligator Lizard, Madrean Alligator Lizard
  Elgaria multicarinata (Blainville, 1835) -- valid -- Lagarto escorpión del Sur, Southern Alligator Lizard
  Elgaria multicarinata webbii (Baird, 1858) -- valid -- San Diego Alligator Lizard
  Elgaria panamintina (Stebbins, 1958) -- valid -- Panamint Alligator Lizard
  Elgaria parva (Knight and Scudday, 1985) -- invalid -- Lagarto escorpión pigmeo
  Elgaria paucicarinata (Fitch, 1934) -- valid -- Lagarto escorpión de San Lucas, San Lucan Alligator Lizard
  Elseya Gray, 1867 -- valid -- Australian Snapping Turtles
  Elseya dentata (Gray, 1863) -- valid -- northern Australian snapping turtle, Northern Snapping Turtle
  Elseya latisternum Gray, 1867 -- invalid -- Serrated Snapping Turtle
  Elseya novaeguineae (Meyer, 1874) -- valid -- New Guinea Snapping Turtle
  Emoia Gray, 1845 -- valid -- Emoias
  Emoia adspersa (Steindachner, 1870) -- valid -- Dark-sided Emoia, Dark-sided Skink, Dateline Emoia, Steindachner's Emo Skink
  Emoia arnoensis Brown and Marshall, 1953 -- valid -- Arno Emoia, Arno Skink, Emo Skink
  Emoia atrocostata (Lesson, 1830) -- valid -- Littoral Emoia, Littoral Skink, Littoral Whiptail-skink, Mangrove Skink
  Emoia boettgeri (Sternfeld, 1918) -- valid -- Boettger's Emo Skink, Boettger's Emoia, Boettger's Skink
  Emoia caeruleocauda (De Vis, 1892) -- valid -- Marianas Blue-tailed Emoia, Marianas Blue-tailed Skink, Pacific Blue-tailed Emoia, Pacific Bluetail Skink
  Emoia cyanogaster (Lesson, 1830) -- valid -- Blue-bellied Emoia, Blue-bellied Skink, Teal Emo Skink
  Emoia cyanura (Lesson, 1830) -- valid -- Azure-tailed Emoia, Azure-tailed skink, Copper-tailed Copper-striped Emoia, Copper-tailed Skink
  Emoia impar (Werner, 1898) -- valid -- Azure-tailed Skink, Blue-tailed Striped Emoia, Blue-tailed Striped Skink
  Emoia jakati (Kopstein, 1926) -- valid -- Jakati Emoia, Kopstein's Emo Skink, Kopstein's Emoia, Kopstein's Skink
  Emoia lawesii (Günther, 1874) -- valid -- Günther's Emo Skink, Lawes' Emoia, Lawes' Skink, Pili Oua
  Emoia mivarti (Boulenger, 1887) -- valid -- Boulenger's Emo Skink, Mivart's Emoia, Mivart's Skink
  Emoia nigra (Jacquinot and Guichenot, 1853) -- valid -- Black Emo Skink, Black Emoia, Black Skink
  Emoia ponapea Kiester, 1982 -- valid -- Kiester's Emo Skink, Ponape Forest Emoia, Ponape Forest Skink
  Emoia samoensis (A. H. A. Duméril in A. M. C. Duméril and A. H. A. Duméril, 1851) -- valid -- Samoa Skink, Samoan Emoia, Samoan Skink
  Emoia slevini Brown and Falanruw, 1972 -- valid -- Marianas Emoia, Slevin's Emo Skink, Slevin's Emoia, Slevin's Skink
  Emydidae Rafinesque, 1815 -- valid -- Emydid Turtles, pond turtles, terrapins
  Emydoidea Gray, 1870 -- valid -- Blanding's Turtles
  Emydoidea blandingii (Holbrook, 1838) -- valid -- Blanding's Turtle, tortue mouchetée
  Emydura Bonaparte, 1836 -- valid -- Australian Short-necked Turtles
  Emydura australis (Gray, 1841) -- invalid -- Australian Big-headed Turtle
  Emydura krefftii (Gray, 1871) -- invalid -- Krefft's River Turtle
  Emydura macquarrii (Gray, 1830) -- invalid -- Murray River Turtle
  Emydura signata Ahl, 1932 -- invalid -- Brisbane Short-necked Turtle
  Emydura subglobosa (Krefft, 1876) -- valid -- Red-bellied Short-necked Turtle
  Emydura victoriae (Gray, 1842) -- valid -- Northern Red-faced Turtle, Victoria Short-necked Turtle
  Emys Duméril, 1805 -- valid -- European Pond Turtles
  Emys bellii Gray, 1830 -- invalid
  Emys blandingii (Holbrook, 1838) -- invalid
  Emys elegans Wied-Neuwied, 1839 -- invalid
  Emys hieroglyphica Holbrook, 1836 -- invalid
  Emys marmorata Baird and Girard, 1852 -- invalid
  Emys orbicularis (Linnaeus, 1758) -- valid -- European Pond Turtle
  Emys pileata Wied-Neuwied, 1865 -- invalid
  Emys pseudogeographica Gray, 1831 -- invalid
  Emys tecta Gray, 1830 -- invalid
  Emys troostii Holbrook, 1836 -- invalid
  Ensatina Gray, 1850 -- valid -- Ensatinas
  Ensatina eschscholtzii Gray, 1850 -- valid -- Ensatina, Salamandra ensantina
  Enulius Cope, 1871 -- valid
  Enulius flavitorques (Cope, 1868) -- valid -- Culebra-cola larga del Pacífico, Pacific Longtail Snake
  Enulius oligostichus H. M. Smith, Arndt and Sherbrook, 1967 -- valid -- Culebra-cola larga mexicana, Mexican Longtail Snake
  Enyaliosaurus Gray, 1845 -- invalid
  Enyaliosaurus clarki (Bailey, 1928) -- invalid -- Garrobo del Balsas
  Enyaliosaurus defensor (Cope, 1866) -- invalid -- Garrobo yucateco
  Enyaliosaurus quinquecarinatus (Gray, 1842) -- invalid -- Garrobo oaxaqueño
  Epicrates Wagler, 1830 -- valid -- Greater Antillean Boas, Rainbow Boas, West Indian Boas
  Epicrates inornatus (Reinhardt, 1843) -- invalid -- Puerto Rican Boa
  Epicrates monensis Zenneck, 1898 -- invalid -- Mona Boa
  Eretmochelys Fitzinger, 1843 -- valid -- Hawksbill Sea Turtles
  Eretmochelys imbricata (Linnaeus, 1766) -- valid -- carey, Hawksbill, Hawksbill Sea Turtle, Tortuga-marina de carey
  Eretmochelys imbricata bissa (Rüppell, 1835) -- invalid -- Pacific hawksbill, Pacific Hawksbill Sea Turtle, Pacific hawksbill turtle
  Eretmochelys imbricata imbricata (Linnaeus, 1766) -- invalid -- Atlantic hawksbill, Atlantic Hawksbill Sea Turtle, Atlantic hawksbill turtle
  Eretmochelys imbricata squamata Agassiz, 1857 -- invalid
  Eridiphas Leviton and Tanner, 1960 -- invalid
  Eridiphas slevini (Tanner, 1943) -- invalid -- Culebra-nocturna de Baja California
  Eristicophis Alcock and Finn, 1897 -- valid
  Erymnochelys Baur, 1888 -- valid -- Madagascan Big-headed Turtles
  Erymnochelys madagascariensis (Grandidier, 1867) -- valid -- Madagascan Big-headed Turtle
  Eublepharidae -- valid -- Eublepharid Geckos
  Eugongylus Fitzinger, 1843 -- valid -- Mastiff Skinks, Short-legged Giant Skinks
  Eugongylus albofasciolatus (Günther, 1872) -- valid -- White-banded Giant Skink, White-banded Mastiff Skink, White-striped Cape Skink
  Eugongylus mentovarius (Boettger, 1895) -- valid -- Odd-chinned Giant Skink, Odd-chinned Mastiff Skink
  Eumeces Wiegmann, 1834 -- valid -- Eumeces, Holarctic Skinks
  Eumeces altamirani Dugès, 1891 -- invalid -- Eslizón de Tepalcatepec
  Eumeces anthracinus (Baird, 1849) -- invalid -- Coal Skink
  Eumeces brevirostris (Günther, 1860) -- invalid -- Eslizón chato
  Eumeces callicephalus Bocourt, 1879 -- invalid -- Mountain Skink
  Eumeces colimensis Taylor, 1935 -- invalid -- Eslizón de Colima
  Eumeces copei Taylor, 1933 -- invalid -- Eslizón de Cope
  Eumeces dugesii Thominot, 1883 -- invalid
  Eumeces egregius (Baird, 1858) -- invalid -- Mole Skink
  Eumeces fasciatus (Linnaeus, 1758) -- invalid -- Five-lined Skink
  Eumeces gaigeae Taylor, 1935 -- invalid
  Eumeces gilberti Van Denburgh, 1896 -- invalid -- Eslizón de Gilbert, Gilbert's Skink
  Eumeces inexpectatus Taylor, 1932 -- invalid -- Southeastern Five-lined Skink
  Eumeces lagunensis Van Denburgh, 1895 -- invalid -- Eslizón de San Lucas
  Eumeces laticeps (Schneider, 1801) -- invalid -- Broad-headed Skink
  Eumeces lynxe Wiegmann, 1834 -- invalid -- Eslizón encinero
  Eumeces multilineatus Tanner, 1957 -- invalid -- Eslizón de Chihuahua
  Eumeces multivirgatus (Hallowell, 1857) -- invalid -- Eslizón muchas líneas, Many-lined Skink
  Eumeces multivirgatus epipleurotus Cope, 1880 -- invalid
  Eumeces multivirgatus gaigeae Taylor, 1935 -- invalid -- Variable Skink
  Eumeces obsoletus (Baird and Girard, 1852) -- invalid -- Eslizón de la Gran Planicie, Great Plains Skink
  Eumeces ochoterenae Taylor, 1933 -- invalid -- Eslizón guerrerense
  Eumeces parviauriculatus Taylor, 1933 -- invalid -- Eslizón pigmeo-norteño
  Eumeces parvulus Taylor, 1933 -- invalid -- Eslizón pigmeo-del sur
  Eumeces schwartzei Fischer, 1884 -- invalid -- Eslizón de Schwartz
  Eumeces septentrionalis (Baird, 1858) -- invalid -- Prairie Skink
  Eumeces skiltonianus (Baird and Girard, 1852) -- invalid -- Eslizón occidental, Western Skink
  Eumeces sumichrasti (Cope, 1867) -- invalid -- Eslizón listado
  Eumeces tetragrammus (Baird, 1859) -- invalid -- Eslizón cuatro líneas, Four-lined Skink
  Eupsophus versus Gorham, 1966 -- invalid
  Eurycea Rafinesque, 1822 -- valid -- Brook Salamanders
  Eurycea aquatica Rose and Bush, 1963 -- valid -- Brown-backed Salamander, Dark-sided Salamander
  Eurycea bislineata (Green, 1818) -- valid -- Northern Two-lined Salamander, salamandre à deux lignes, Two-lined Salamander
  Eurycea cirrigera (Green, 1831) -- valid -- Southern Two-lined Salamander
  Eurycea guttolineata (Holbrook, 1838) -- valid -- Three-lined Salamander
  Eurycea junaluska Sever, Dundee and Sullivan, 1976 -- valid -- Junaluska Salamander
  Eurycea latitans Smith and Potter, 1946 -- valid -- Cascade Caverns Salamander
  Eurycea longicauda (Green, 1818) -- valid -- Long-tailed Salamander
  Eurycea longicauda guttolineata (Holbrook, 1838) -- invalid -- Three-lined Salamander
  Eurycea lucifuga Rafinesque, 1822 -- valid -- Cave Salamander
  Eurycea multiplicata (Cope, 1869) -- valid -- Many-ribbed Salamander
  Eurycea nana Bishop, 1941 -- valid -- San Marcos Salamander
  Eurycea neotenes Bishop and Wright, 1937 -- valid -- Texas Salamander
  Eurycea neotenes latitans Smith and Potter, 1946 -- invalid
  Eurycea neotenes pterophila Burger, Smith and Potter, 1950 -- invalid
  Eurycea pterophila Burger, Smith and Potter, 1950 -- valid -- Fern Bank Salamander
  Eurycea quadridigitata (Holbrook, 1842) -- valid -- Dwarf Salamander, Southeastern Dwarf Salamander
  Eurycea sosorum Chippindale, Price and Hillis, 1993 -- valid -- Barton Springs Salamander
  Eurycea tridentifera Mitchell and Reddell, 1965 -- invalid -- Comal Blind Salamander
  Eurycea troglodytes Baker, 1957 -- valid -- Valdina Farms Salamander
  Eurycea tynerensis Moore and Hughes, 1939 -- valid -- Oklahoma Salamander
  Eurycea wilderae Dunn, 1920 -- valid -- Blue Ridge Two-lined Salamander
  Eutaenia sirtalis tetrataenia Cope in Yarrow, 1875 -- invalid
  Exiliboa Bogert, 1968 -- valid
  Exiliboa placata Bogert, 1968 -- valid -- Boa-enana oaxaqueña
  Farancia Gray, 1842 -- valid -- Mud Snakes, Mudsnakes, Rainbow Snakes
  Farancia abacura (Holbrook, 1836) -- valid -- Mud Snake, Mudsnake, Red-bellied Mudsnake
  Farancia erytrogramma (Palisot de Beauvois, 1801) -- valid -- Rainbow Snake
  Ficimia Gray, 1849 -- valid -- Mexican Hook-nosed Snakes, Southern Hook-nosed Snakes
  Ficimia olivacea Gray, 1849 -- valid -- Culebra-naricilla huasteca
  Ficimia publia Cope, 1866 -- valid -- Blotched Hooknose Snake, Culebra-naricilla manchada
  Ficimia ramirezi H. M. Smith and Langebartel, 1949 -- valid -- Culebra-naricilla de Ramírez, Ramirez's Hooknose Snake
  Ficimia ruspator H. M. Smith and Taylor, 1941 -- valid -- Culebra-naricilla guerrerense, Guerreran Hooknose Snake
  Ficimia streckeri Taylor, 1931 -- valid -- Culebra-naricilla mexicana, Mexican Hook-nosed Snake, Mexican Hooknose Snake, Tamaulipan Hook-nosed Snake, Tamaulipan Hooknose Snake
  Ficimia variegata (Günther, 1858) -- valid -- Culebra-naricilla de Tehuantepec, Tehuantepec Hooknose Snake
  Furcifer Fitzinger, 1843 -- valid
  Furcifer angeli (Brygoo and Domergue, 1968) -- valid
  Furcifer antimena (Grandidier, 1872) -- valid
  Furcifer balteatus (A. M. C. Duméril and Bibron, 1851) -- valid
  Furcifer belalandaensis (Brygoo and Domergue, 1970) -- valid
  Furcifer bifidus (Brongniart, 1800) -- valid
  Furcifer campani (Grandidier, 1872) -- valid
  Furcifer cephalolepis (Günther, 1880) -- valid
  Furcifer labordi (Grandidier, 1872) -- valid -- Labord's Chameleon
  Furcifer lateralis (Gray, 1831) -- valid -- Carpet Chameleon
  Furcifer minor (Günther, 1879) -- valid -- Lesser Chameleon
  Furcifer monoceras (Boettger, 1913) -- invalid
  Furcifer nicosiai Jesu, Mattioli and Schimmenti, 1999 -- valid
  Furcifer oustaleti (Mocquard, 1894) -- valid
  Furcifer pardalis (Cuvier, 1829) -- valid
  Furcifer petteri (Brygoo and Domergue, 1966) -- valid
  Furcifer polleni (W. C. H. Peters, 1874) -- valid
  Furcifer rhinoceratus (Gray, 1845) -- valid
  Furcifer tuzetae (Brygoo, Bourgat and Domergue, 1972) -- valid
  Furcifer verrucosus (Cuvier, 1829) -- valid
  Furcifer willsii (Günther, 1890) -- valid
  Gambelia Baird, 1859 -- valid -- Leopard Lizards
  Gambelia sila (Stejneger, 1890) -- valid -- Blunt-nosed Leopard Lizard, Bluntnose Leopard Lizard, San Joaquin Leopard Lizard
  Gambelia wislizenii (Baird and Girard, 1852) -- valid -- Lagartija-leopardo narigona, Long-nosed Leopard Lizard, Longnose Leopard Lizard
  Garthius Malhotra and Thorpe, 2004 -- valid
  Gastrophryne Fitzinger, 1843 -- valid -- Narrow-mouthed Toads, North American Narrow-mouthed Toads
  Gastrophryne carolinensis (Holbrook, 1835) -- valid -- Eastern Narrow-mouthed Toad
  Gastrophryne olivacea (Hallowell, 1856) -- valid -- Great Plains Narrow-mouthed Toad, Sapo-boca angosta oliváceo, Western Narrow-mouthed Toad
  Gavialidae Adams, 1854 -- valid -- Gavials, Gharials
  Gavialis Oppel, 1811 -- valid -- Gavials, Gharial
  Gavialis gangeticus (Gmelin, 1789) -- valid -- Gavial, Gharial
  Geagras Cope, 1876 -- valid
  Geagras redimitus Cope, 1876 -- valid -- Culebra-minera de Tehuantepec, Tehuantepec Striped Snake
  Gehyra Gray, 1834 -- valid -- Dtellas, Web-toed Geckos
  Gehyra brevipalmata (W. Peters, 1874) -- valid -- Palauan Web-toed Gecko
  Gehyra mutilata (Wiegmann, 1834) -- valid -- Geco plano, Mutilating Gecko, Stump-toed Gecko
  Gehyra oceanica (Lesson, 1830) -- valid -- Big Tree Gecko, Oceanic Gecko
  Gehyra papuana Meyer, 1874 -- valid -- Papuan Web-toed Gecko
  Gekko Laurenti, 1768 -- valid -- Gekkos, Tropical Asian Geckos, Typical Geckos
  Gekko gecko (Linnaeus, 1758) -- valid -- Tokay Gecko, Tokay Gekko
  Gekko vittatus Houttuyn, 1782 -- valid -- Striped Gecko, Striped Gekko
  Gekkonidae -- valid -- Geckos
  Gekkota -- valid
  Geochelone Fitzinger, 1835 -- valid -- Geochelone Tortoises, geoclelone tortoises, typical tortoises
  Geochelone carbonaria (Spix, 1824) -- invalid -- Red-footed Tortoise
  Geochelone chilensis (Gray, 1870) -- invalid -- Chaco tortoise
  Geochelone denticulata (Linnaeus, 1766) -- invalid -- South American Yellow-footed Tortoise
  Geochelone elegans (Schoepff, 1795) -- valid -- Indian Star Tortoise
  Geochelone elephantopus (Harlan, 1827) -- invalid
  Geochelone geometrica (Linnaeus, 1758) -- invalid
  Geochelone gigantea (Schweigger, 1812) -- invalid -- Aldabra Tortoise
  Geochelone nigra (Quoy and Gaimard, 1824) -- invalid -- Galapagos Tortoise
  Geochelone pardalis (Bell, 1828) -- invalid -- Leopard Tortoise
  Geochelone platynota (Blyth, 1863) -- valid -- Burmese Star Tortoise
  Geochelone radiata (Shaw, 1802) -- invalid -- Radiated Tortoise
  Geochelone sulcata (Miller, 1779) -- invalid -- African Spurred Tortoise
  Geochelone yniphora (Vaillant, 1885) -- invalid -- Angonoka, Angulated Tortoise
  Geoclemys Gray, 1856 -- valid -- spotted pond turtles
  Geoclemys hamiltonii (Gray, 1830) -- valid -- Black Pond Turtle, Spotted Pond Turtle
  Geoemyda Gray, 1834 -- valid -- Leaf Turtles
  Geoemyda silvatica Henderson, 1912 -- invalid -- Cochin Forest Cane Turtle
  Geoemyda spengleri (Gmelin, 1789) -- valid -- Black-breasted Leaf Turtle
  Geophis Wagler, 1830 -- valid
  Geophis anocularis Dunn, 1920 -- valid -- Culebra-minera de Sierra Mije, Sierra Mije Earth Snake
  Geophis bicolor Günther, 1868 -- valid -- Culebra-minera del Altiplano, Mexican Plateau Earth Snake
  Geophis blanchardi Taylor and H. M. Smith, 1939 -- valid -- Blanchard's Earth Snake, Culebra-minera de Blanchard
  Geophis cancellatus H. M. Smith, 1941 -- valid -- Chiapas Earth Snake, Culebra-minera de Chiapas
  Geophis carinosus Stuart, 1941 -- valid -- Culebra-minera aquillada, Keeled Earth Snake
  Geophis chalybeus (Wagler, 1830) -- valid -- Culebra-minera veracruzana, Veracruz Earth Snake
  Geophis dubius (Peters, 1861) -- valid -- Culebra-minera de la Mesa del Sur, Mesa del Sur Earth Snake
  Geophis duellmani H. M. Smith and Holland, 1969 -- valid -- Culebra-minera de Sierra de Juárez, Sierra Juarez Earth Snake
  Geophis dugesi Bocourt, 1883 -- invalid -- Culebra-minera de Chihuahua
  Geophis immaculatus Downs, 1967 -- valid -- Culebra-minera inmaculada, Downs' Earth Snake
  Geophis incomptus Duellman, 1959 -- valid -- Culebra-minera de Sierra Coacolman, Sierra Coalcoman Earth Snake
  Geophis isthmicus (Boulenger, 1894) -- valid -- Culebra-minera de Tehuantepec, Isthmian Earth Snake
  Geophis laticinctus H. M. Smith and Williams, 1963 -- valid -- Culebra-minera de la Mesa Central, Mesa Central Earth Snake
  Geophis latifrontalis Garman, 1883 -- valid -- Culebra-minera potosina, Potosí Earth Snake
  Geophis maculiferus Taylor, 1941 -- valid -- Culebra-minera michoacana, Michoacán Earth Snake
  Geophis mutitorques (Cope, 1885) -- valid -- Culebra-minera de tierras altas, Highland Earth Snake
  Geophis nasalis (Cope, 1868) -- valid -- Coffee Earth Snake, culeba-minera del café
  Geophis nigrocinctus Duellman, 1959 -- valid -- Black-banded Earth Snake, Culebra-minera rayas negras
  Geophis omiltemanus Günther, 1893 -- valid -- Culebra-minera guerrerense, Guerreran Earth Snake
  Geophis petersii Boulenger, 1894 -- valid -- Peters' Earth Snake
  Geophis pyburni Campbell and Murphy, 1977 -- valid -- Culebra-minadora de Pyburn, Pyburn's Earth Snake
  Geophis russatus H. M. Smith and Williams, 1966 -- valid -- Culebra-minadora roja, Red Earth Snake
  Geophis sallaei Boulenger, 1894 -- valid -- Culebra-minadora de Salle, Sallae's Earth Snake
  Geophis semidoliatus (A. M. C. Duméril, Bibron and A. H. A. Duméril, 1854) -- valid -- Coral Earth Snake, Culebra-minadora coralillo
  Geophis sieboldi (Jan, 1862) -- valid -- Culebra-miandora de Siebold, Siebold's Earth Snake
  Geophis tarascae Hartweg, 1959 -- valid -- Culebra-miandora tarasca, Tarascan Earth Snake
  Gerrhonotus Wiegmann, 1828 -- valid -- Alligator Lizards
  Gerrhonotus infernalis Baird, 1859 -- valid -- Texas Alligator Lizard
  Gerrhonotus lugoi McCoy, 1970 -- valid -- Lagarto escorpión de Lugo, Lugo's Alligator Lizard
  Gerrhonotus tessellatus Wiegmann, 1834 -- invalid
  Gloydius Hoge and Romano-Hoge, 1981 -- valid
  Gonatodes Fitzinger, 1843 -- valid -- American Bent-toed Geckos, Bent-toed Geckos
  Gonatodes albogularis (Duméril and Bibron, 1836) -- valid -- Geco cabeza amarilla, Yellow-headed Gecko
  Gopherus Rafinesque, 1832 -- valid -- Gopher Tortoises, North American Tortoises
  Gopherus agassizii (Cooper, 1861) -- valid -- Agassiz's Desert Tortoise, Desert Tortoise, Mohave Desert Tortoise, Mojave Desert Tortoise
  Gopherus berlandieri (Agassiz, 1857) -- valid -- Berlandier's Tortoise, Galápago tamaulipeco, Texas Tortoise
  Gopherus flavomarginatus Legler, 1959 -- valid -- Bolson Tortoise, Galápago de Mapimí
  Gopherus polyphemus (Daudin, 1801) -- valid -- Gopher Tortoise
  Graptemys Agassiz, 1857 -- valid -- Map Turtles
  Graptemys barbouri Carr and Marchand, 1942 -- valid -- Barbour's Map Turtle
  Graptemys caglei Haynes and McKown, 1974 -- valid -- Cagle's Map Turtle
  Graptemys ernsti Lovich and McCoy, 1992 -- valid -- Escambia Map Turtle
  Graptemys flavimaculata Cagle, 1954 -- valid -- sawback turtle, Yellow-blotched Map Turtle, Yellow-blotched Sawback
  Graptemys geographica (Le Sueur, 1817) -- valid -- Common Map Turtle, Northern Map Turtle, tortue géographique
  Graptemys gibbonsi Lovich and McCoy, 1992 -- valid -- Pascagoula Map Turtle
  Graptemys kohnii (Baur, 1890) -- invalid -- Mississippi Map Turtle
  Graptemys nigrinoda Cagle, 1954 -- valid -- Black-knobbed Map Turtle, Black-knobbed Sawback
  Graptemys nigrinoda delticola Folkerts and Mount, 1969 -- invalid -- Delta Map Turtle, Southern Black-knobbed Map Turtle
  Graptemys nigrinoda nigrinoda Cagle, 1954 -- valid -- Black-knobbed Map Turtle, Northern Black-knobbed Map Turtle
  Graptemys oculifera (Baur, 1890) -- valid -- Ringed Map Turtle, Ringed Sawback, ringed sawback turtle
  Graptemys ouachitensis Cagle, 1953 -- valid -- Ouachita Map Turtle, Southern Map Turtle
  Graptemys pseudogeographica (Gray, 1831) -- valid -- False Map Turtle
  Graptemys pseudogeographica ouachitensis Cagle, 1953 -- invalid
  Graptemys pseudogeographica pseudogeographica (Gray, 1831) -- valid -- False Map Turtle, Northern False Map Turtle
  Graptemys pseudogeographica sabinensis Cagle, 1953 -- invalid -- Sabine Map Turtle
  Graptemys pulchra Baur, 1893 -- valid -- Alabama Map Turtle
  Graptemys versa Stejneger, 1925 -- valid -- Texas Map Turtle
  Gyalopion Cope, 1860 -- valid -- Hook-nosed Snakes, Western Hook-nosed Snakes
  Gyalopion canum (Cope, 1860) -- valid -- Chihuahuan Hook-nosed Snake, Culebra-nariz ganchuda de Chihuahua, Western Hook-nosed Snake, Western Hooknose Snake
  Gyalopion quadrangulare (Günther, 1893) -- valid -- Culebra-nariz ganchuda de desierto, Desert Hooknose Snake, Thornscrub Hook-nosed Snake, Thornscrub Hooknose Snake
  Gymnophiona -- valid -- Caecilians
  Gymnophthalmus speciosus (Hallowell, 1861) -- valid -- Golden Spectacled Lizard, Golden Spectacled Tegu, Golden Tegulet, Lagartija Dorada, Lagartija-anteojada dorada
  Gyrinophilus Cope, 1869 -- valid -- Cave Salamanders, Spring Salamanders
  Gyrinophilus gulolineatus Brandon, 1965 -- valid -- Berry Cave Salamander
  Gyrinophilus palleucus McCrady, 1954 -- valid -- Tennessee Cave Salamander
  Gyrinophilus palleucus gulolineatus Brandon, 1965 -- invalid -- Berry Cave Salamander
  Gyrinophilus porphyriticus (Green, 1827) -- valid -- salamandre pourpre, Spring Salamander
  Gyrinophilus subterraneus Besharse and Holsinger, 1977 -- valid -- West Virginia Spring Salamander
  Haideotriton Carr, 1939 -- invalid -- Georgia Blind Salamanders
  Haideotriton wallacei Carr, 1939 -- invalid -- Georgia Blind Salamander
  Hardella Gray, 1870 -- valid -- Crowned River Turtles
  Hardella thurjii (Gray, 1831) -- valid -- Crowned River Turtle
  Helicops petersi Rossman, 1976 -- valid -- Spiral Keelback
  Heloderma Wiegmann, 1829 -- valid -- Beaded Lizards, Gila Monsters
  Heloderma horridum (Wiegmann, 1829) -- valid -- Beaded Lizard, Lagarto enchaquirado, Mexican Beaded Lizard
  Heloderma horridum alvarezi Bogert and Martín del Campo, 1956 -- invalid -- Black Beaded Lizard
  Heloderma horridum charlesbogerti Campbell and Vannini, 1988 -- invalid -- Montagua Valley Beaded Lizard
  Heloderma horridum exasperatum Bogert and Martín del Campo, 1956 -- invalid -- Rio Fuerte Beaded Lizard
  Heloderma horridum horridum (Wiegmann, 1829) -- invalid -- Mexican Beaded Lizard
  Heloderma suspectum Cope, 1869 -- valid -- Gila Monster, Lagarto de Gila
  Heloderma suspectum cinctum Bogert and Martín del Campo, 1956 -- valid -- Banded Gila Monster
  Heloderma suspectum suspectum Cope, 1896 -- valid -- Reticulate Gila Monster
  Helodermatidae Gray, 1837 -- valid -- Beaded Lizards, Gila Monsters, Venomous Lizards
  Hemidactylium Tschudi, 1838 -- valid -- Four-toed Salamanders
  Hemidactylium scutatum (Temminck in Temminck and Schlegel, 1838) -- valid -- Four-toed Salamander, salamandre à quatre doigts
  Hemidactylus Gray, 1825 -- valid -- Half-toed Geckos, House Geckos
  Hemidactylus brookii Gray, 1845 -- valid -- Brook's House Gecko
  Hemidactylus frenatus Schlegel, 1836 -- valid -- Bridled House Gecko, Common House Gecko, Geco-casero bocón
  Hemidactylus garnotii Duméril and Bibron, 1836 -- valid -- Fox Gecko, Indo-Pacific Gecko, Indo-Pacific House Gecko, Indopacific Gecko
  Hemidactylus mabouia (Moreau De Jonnès, 1818) -- valid -- Afro-American House Gecko, Afroamerican house gecko, Cosmopolitan House Gecko, Geco-casero tropical, Wood Slave
  Hemidactylus turcicus (Linnaeus, 1758) -- valid -- Geco-casero del Mediterráneo, Mediterranean Gecko, Mediterranean Gekko, Mediterranean House Gecko
  Hemiphyllodactylus Bleeker, 1860 -- valid -- Gypsy Geckos, Small Tree Geckos, Tree Geckos
  Hemiphyllodactylus typus Bleeker, 1860 -- valid -- Indo-Pacific slender gecko, Indo-Pacific Tree Gecko, Indopacific Tree Gecko, Small Tree Gecko
  Heosemys Stejneger, 1902 -- valid -- Forest Turtles
  Heosemys depressa (Anderson, 1875) -- valid -- Arakan Forest Turtle
  Heosemys grandis (Gray, 1860) -- valid -- Giant Asian Pond Turtle
  Heosemys leytensis Taylor, 1920 -- invalid -- Philippine Pond Turtle
  Heosemys spinosa (Gray, 1830) -- valid -- Spiny Turtle
  Heterodon Latreille in Sonnini and Latreille, 1801 -- valid -- Hog-nosed Snakes, North American Hog-nosed Snakes
  Heterodon nasicus Baird and Girard, 1852 -- valid -- Culebra-nariz de cerdo occidental, Plains Hog-nosed Snake, Plains Hognose Snake, Western Hog-nosed Snake, Western Hognose Snake
  Heterodon platyrhinos Latreille, 1801 -- invalid
  Heterodon simus (Linnaeus, 1766) -- valid -- Southern Hog-nosed Snake, Southern Hognose Snake
  Hieremys Smith, 1916 -- invalid -- Yellow-headed Temple Turtles
  Hieremys annandalii (Boulenger, 1903) -- invalid -- Yellow-headed Temple Turtle
  Holbrookia Girard, 1851 -- valid -- Earless Lizards, Lesser Earless Lizards
  Holbrookia lacerata Cope, 1880 -- valid -- Lagartija-sorda cola punteada, Northern Spot-tailed Earless Lizard, Plateau Earless Lizard, Spot-tailed Earless Lizard
  Holbrookia maculata Girard, 1851 -- valid -- Common Earless Lizard, Common Lesser Earless Lizard, Lagartija-sorda menor, Lesser Earless Lizard
  Holbrookia maculata thermophila Barbour, 1921 -- invalid -- Sonoran Earless Lizard, Western Earless Lizard
  Holbrookia propinqua Baird and Girard, 1852 -- valid -- Keel-scaled Earless Lizard, Keeled Earless Lizard, Lagartija-sorda carinata
  Holoaden bradei Lutz, 1958 -- valid
  Homalopsis schneideri Schlegel, 1837 -- invalid
  Homalopsis schneiderii Schlegel, 1837 -- invalid
  Homalosaurus ventralis Hallowell, 1852 -- invalid
  Homopus Duméril and Bibron, 1834 -- valid -- Cape Tortoises
  Homopus areolatus (Thunberg, 1787) -- valid -- Beaked Cape Tortoise, Common Padloper, Parrot-beaked Tortoise
  Homopus bergeri Lindholm, 1906 -- invalid -- Berger's Cape Tortoise
  Homopus boulengeri Duerden, 1906 -- valid -- Boulenger's Cape Tortoise, Karoo Dwarf Tortoise, Karoo Padloper
  Homopus femoralis Boulenger, 1888 -- valid -- Greater Dwarf Tortoise, Greater Padloper, Karroo Cape tortoise
  Homopus signatus (Gmelin, 1789) -- valid -- Speckled Cape Tortoise, Speckled Padloper, Speckled Tortoise
  Hoplobatrachus Peters, 1863 -- valid
  Hoplobatrachus tigerinus (Daudin, 1802) -- valid
  Hyalinobatrachium fleischmanni (Boettger, 1893) -- valid -- Rana vientre traslúcido
  Hydromantes Gistel, 1848 -- valid -- Web-toed Salamanders
  Hydromantes brunus Gorman, 1954 -- valid -- Limestone Salamander
  Hydromantes platycephalus (Camp, 1916) -- valid -- Mount Lyell Salamander
  Hydromantes shastae Gorman and Camp, 1953 -- valid -- Shasta Salamander
  Hydromedusa Wagler, 1830 -- valid -- South American snake-necked turtles
  Hydromedusa maximiliani (Mikan, 1825) -- valid -- Brazilian Snake-necked Turtle, Maximilian's Snake-necked Turtle
  Hydromedusa tectifera Cope, 1870 -- valid -- South American Snake-necked Turtle
  Hydrophiidae Fitzinger, 1843 -- invalid -- Sea Snakes, Seasnakes
  Hyla Laurenti, 1768 -- valid -- Holarctic Treefrogs, Treefrogs
  Hyla andersonii Baird, 1854 -- invalid -- Pine Barrens Treefrog
  Hyla arenicolor Cope, 1866 -- invalid -- Canyon Treefrog, Rana-de árbol color arena
  Hyla avivoca Viosca, 1928 -- invalid -- Bird-voiced Treefrog
  Hyla bogertae Straughan and Wright, 1969 -- invalid -- Rana-de árbol acuática-de Bogart
  Hyla cadaverina Cope, 1866 -- invalid -- California Treefrog
  Hyla chrysoscelis Cope, 1880 -- invalid -- Cope's Gray Treefrog
  Hyla cinerea (Schneider, 1799) -- invalid -- Green Tree Frog, Green Treefrog
  Hyla crassa (Brocchi, 1877) -- invalid -- Rana-de árbol acuática
  Hyla crucifer Wied-Neuwied, 1838 -- invalid
  Hyla crucifer bartramiana Harper, 1939 -- invalid
  Hyla crucifer crucifer Wied-Neuwied, 1838 -- invalid
  Hyla erythromma Taylor, 1937 -- invalid -- Rana-de árbol común
  Hyla eximia Baird, 1854 -- invalid -- Mountain Treefrog, Rana-de árbol de montaña
  Hyla eximia wrightorum Taylor, 1939 -- invalid
  Hyla femoralis Daudin, 1800 -- invalid -- Pine Woods Treefrog
  Hyla gratiosa LeConte, 1856 -- invalid -- Barking Treefrog
  Hyla regilla Baird and Girard, 1852 -- invalid
  Hyla squirella Daudin, 1800 -- invalid -- Squirrel Treefrog
  Hyla versicolor LeConte, 1825 -- invalid -- Gray Treefrog, rainette versicolore
  Hyla wrightorum Taylor, 1939 -- invalid -- Arizona Treefrog, Mountain Treefrog
  Hylidae Rafinesque, 1815 -- valid -- Hylid Frogs, hylidés, hylidés arboricoles, Hylids, New World Tree Frogs, Treefrogs
  Hypnale Fitzinger, 1843 -- valid
  Hypopachus Keferstein, 1867 -- valid -- Sheep Frogs
  Hypopachus variolosus (Cope, 1866) -- valid -- Northern Sheep Frog, Rana-oveja común, Sheep Frog
  Hypsiglena Cope, 1860 -- valid -- Night Snakes, Nightsnakes
  Hypsiglena torquata (Günther, 1860) -- valid -- Culebra-nocturna ojo de gato, Night Snake, Nightsnake, Sinaloan Nightsnake
  Hypsilurus W. C. H. Peters, 1867 -- valid -- Angle-headed Forest Dragon, Angle-headed Forest Dragons
  Hypsilurus godeffroyi (W. C. H. Peters, 1867) -- valid -- Northern Forest Dragon
  Iguana Laurenti, 1768 -- valid -- Green Iguanas, Iguanas
  Iguana iguana (Linnaeus, 1758) -- valid -- Common Green Iguana, Green Iguana, Iguana verde, iguane commun
  Iguania -- valid -- Iguanas, iguanes
  Iguanidae -- valid -- American Arboreal Lizards, Chuckwallas, Iguanas, Iguanids
  Imantodes gemmistratus (Cope, 1861) -- valid -- Central American Tree Snake, Culebra-cordelilla centroamericana
  Imantodes tenuissimus (Cope, 1867) -- valid -- Culebra-cordelilla yucateca, Yucatán Blunthead Snake
  Indotestudo Lindholm, 1929 -- valid -- Asian Tortoises
  Indotestudo elongata (Blyth, 1853) -- valid -- Elongated Tortoise, Yellow-headed Tortoise
  Indotestudo forstenii (Schlegel and Müller, 1845) -- valid -- East Indian Tortoise, Forsten's Tortoise, travancore tortoise
  Ixalotriton niger Wake and Johnson, 1989 -- valid -- Salamandra-saltarina negra
  Kachuga Gray, 1856 -- invalid -- Indian roofed turtles
  Kachuga dhongoka (Gray, 1832) -- invalid -- Three-striped Roofed Turtle
  Kachuga kachuga (Gray, 1831) -- invalid -- Red-crowned Roofed Turtle
  Kachuga smithii (Gray, 1863) -- invalid -- Brown Roofed Turtle
  Kachuga sylhetensis (Jerdon, 1870) -- invalid -- Assam Roofed Turtle
  Kachuga tecta (Gray, 1830) -- invalid -- Indian Roofed Turtle
  Kachuga tentoria (Gray, 1834) -- invalid -- Indian Tent Turtle
  Kachuga trivittata (Duméril and Bibron, 1835) -- invalid -- Burmese Roofed Turtle
  Kentropyx Spix, 1825 -- valid
  Kentropyx striata (Daudin, 1802) -- valid -- Striped Kentropyx, Striped Whiptail
  Kinixys Bell, 1827 -- valid -- Hinge-back Tortoises
  Kinixys belliana Gray, 1830 -- valid -- Bell's Hinge-back Tortoise
  Kinixys erosa (Schweigger, 1812) -- valid -- Forest Hinge-back Tortoise, Serrated Hinge-back Tortoise
  Kinixys homeana Bell, 1827 -- valid -- Home's Hinge-back Tortoise
  Kinixys natalensis Hewitt, 1935 -- valid -- Natal Hinge-back Tortoise
  Kinosternidae Agassiz, 1857 -- valid -- Mud Turtles, Musk Turtles
  Kinosterninae Agassiz, 1857 -- valid
  Kinosternon Spix, 1824 -- valid -- American Mud Turtles, American musk turtles, mud turtles
  Kinosternon acutum Gray, 1831 -- valid -- Tabasco Mud Turtle, Tortuga-pecho quebrado de Tabasco
  Kinosternon alamosae Berry and Legler, 1980 -- valid -- Alamos Mud Turtle, Tortuga-pecho quebrado de Álamos
  Kinosternon angustipons Legler, 1965 -- valid -- Narrow-bridged Mud Turtle
  Kinosternon baurii (Garman, 1891) -- valid -- Striped Mud Turtle
  Kinosternon baurii palmarum Stejneger, 1925 -- invalid
  Kinosternon creaseri Hartweg, 1934 -- valid -- Creaser's Mud Turtle, Tortuga-pecho quebrado de Craser
  Kinosternon dunni Schmidt, 1947 -- valid -- Dunn's Mud Turtle
  Kinosternon flavescens (Agassiz, 1857) -- valid -- Tortuga-pecho quebrado amarilla, Yellow Mud Turtle
  Kinosternon flavescens arizonense Gilmore, 1922 -- invalid -- Arizona mud turtle, southwestern mud turtle
  Kinosternon flavescens arizonense Gilmore, 1923 -- invalid
  Kinosternon flavescens flavescens (Agassiz, 1857) -- invalid -- yellow mud turtle
  Kinosternon flavescens spooneri Smith, 1951 -- invalid
  Kinosternon herrerai Stejneger, 1925 -- valid -- Herrera's Mud Turtle, Tortuga-pecho quebrado de Herrera
  Kinosternon hippocrepis Gray, 1856 -- invalid
  Kinosternon hirtipes Wagler, 1830 -- valid -- Mexican mud turtle, Mexican Rough-footed Mud Turtle, Rough-footed Mud Turtle, Tortuga-pecho quebrado pata rugosa
  Kinosternon hirtipes hirtipes Wagler, 1830 -- valid -- Mexican mud turtle, Valley of Mexico Mud Turtle
  Kinosternon hirtipes murrayi Glass and Hartweg, 1951 -- valid -- Mexican Plateau Mud Turtle
  Kinosternon integrum Le Conte, 1854 -- valid -- Mexican Mud Turtle, Tortuga-pecho quebrado mexicana
  Kinosternon leucostomum Duméril and Bibron in Duméril and Duméril, 1851 -- valid -- Tortuga-pecho quebrado labios blancos, White-lipped Mud Turtle
  Kinosternon murrayi Glass and Hartweg, 1951 -- invalid
  Kinosternon oaxacae Berry and Iverson, 1980 -- valid -- Oaxaca Mud Turtle, Tortuga-pecho quebrado oaxaqueña
  Kinosternon scorpioides (Linnaeus, 1766) -- valid -- Scorpion Mud Turtle, Tortuga-pecho quebrado escorpión
  Kinosternon sonoriense Le Conte, 1854 -- valid -- Sonora Mud Turtle, Sonoran mud turtle, Tortuga-pecho quebrado sonorense
  Kinosternon sonoriense longifemorale Iverson, 1981 -- valid -- Sonoran Mud Turtle, Sonoyta Mud Turtle
  Kinosternon sonoriense sonoriense Le Conte, 1854 -- valid -- Desert Mud Turtle, Sonora Mud Turtle, Sonoran Mud Turtle
  Kinosternon subrubrum (Lacépède, 1788) -- invalid -- Eastern Mud Turtle
  Kinosternon subrubrum hippocrepis Gray, 1856 -- valid -- Mississippi Mud Turtle
  Kinosternon subrubrum steindachneri Siebenrock, 1906 -- valid -- Florida Mud Turtle
  Kinosternon subrubrum subrubrum (Lacépède, 1788) -- invalid
  Kinyongia Tilbury, Tolley and Branch, 2006 -- valid
  Kinyongia adolfifriderici (Sternfeld, 1912) -- valid -- Ituri Chameleon
  Kinyongia carpenteri (Parker, 1929) -- valid -- Carpenter's Chameleon
  Kinyongia excubitor (Barbour, 1911) -- valid -- Mt Kenya Hornless Chameleon
  Kinyongia fischeri (Reichenow, 1887) -- valid
  Kinyongia oxyrhina (Klaver and Böhme, 1988) -- valid -- Rednose Dwarf Chameleon
  Kinyongia oxyrhinum (Klaver and Böhme, 1988) -- invalid
  Kinyongia tavetana (Steindachner, 1891) -- valid -- Kilimanjaro Two-horned Chamaeleon
  Kinyongia tavetanum (Steindachner, 1891) -- invalid
  Kinyongia tenue (Matschie, 1892) -- invalid
  Kinyongia tenuis (Matschie, 1892) -- valid -- Matschie's Dwarf Chameleon, Usambara Soft-horned Chameleon
  Kinyongia uthmoelleri (L. Müller, 1938) -- valid -- Uthmöller's Chameleon
  Kinyongia xenorhina (Boulenger, 1901) -- valid -- Strange-horned Chameleon
  Kinyongia xenorhinum (Boulenger, 1901) -- invalid
  Lacerta vivipara Jacquin, 1787 -- invalid -- Viviparous Lizard
  Lacertidae -- valid -- Lacertid Lizards, Old World Runners
  Lacertilia -- invalid -- lagarto, Lizards
  Lachesis Daudin, 1803 -- valid
  Laemanctus longipes Wiegmann, 1834 -- valid -- Eastern Casquehead Iguana, Lemacto coludo
  Laemanctus serratus Cope, 1864 -- valid -- Lemacto coronado, Serrated Casquehead Iguana
  Lamprolepis Fitzinger, 1843 -- valid -- Tree Skinks, Treeskinks
  Lamprolepis smaragdina (Lesson, 1829) -- valid -- Emerald Skink, Green Tree Skink, Green Treeskink
  Lampropeltis Fitzinger, 1843 -- valid -- Kingsnakes, Milk Snakes
  Lampropeltis alterna (Brown, 1901) -- valid -- Culebra-real bandas grises, Gray-banded Kingsnake, Grey-banded Kingsnake
  Lampropeltis calligaster (Harlan, 1827) -- valid -- Prairie Kingsnake, Yellow-bellied Kingsnake
  Lampropeltis getula (Linnaeus, 1766) -- valid -- Common Kingsnake, Culebra-real común, Eastern Kingsnake
  Lampropeltis pyromelana (Cope, 1867) -- valid -- Arizona Mountain Kingsnake, Culebra-real sonorense, Sonoran Mountain Kingsnake
  Lampropeltis ruthveni Blanchard, 1920 -- valid -- Culebra-real de Ruthven, Ruthvens Kingsnake
  Lampropeltis triangulum (Lacépède, 1789) -- valid -- couleuvre tachetée, Culebra-real coralillo, Eastern Milk Snake, Eastern Milksnake
  Lampropeltis zonata (Lockington ex Blainville, 1876) -- valid -- California Mountain Kingsnake, Culebra-real californiana, St. Helena Mountain Kingsnake
  Lampropholis Fitzinger, 1843 -- valid -- Indo-Australian Ground Skinks, sunskinks
  Lampropholis delicata (De Vis, 1888) -- valid -- Garden Skink, Grass Skink, Metallic Skink, Plague Skink, Rainbow Skink
  Lanthanotidae Steindachner, 1877 -- valid -- Earless Monitor Lizard, Earless Monitors
  Lanthanotus Steindachner, 1877 -- valid
  Lanthanotus borneensis Steindachner, 1877 -- valid -- Earless Monitor Lizard
  Laticauda Laurenti, 1768 -- valid -- Sea Kraits, Seakraits
  Laticauda colubrina (Schneider, 1799) -- valid -- Banded Sea Krait, Banded Seakrait, Colubrine Sea Krait, Yellow-lipped Sea Krait
  Leiocephalus Gray, 1827 -- valid -- Curly-tailed Lizards
  Leiocephalus carinatus Gray, 1827 -- valid -- Carinate Curly-tailed Lizard, Northern Curly-tailed Lizard
  Leiocephalus eremitus (Cope, 1868) -- valid -- Navassa Curly-tailed Lizard, Navassa Curlytail Lizard
  Leiocephalus schreibersii (Gravenhorst, 1838) -- valid -- Red-sided Curly-tailed Lizard, Schreiber's Curly-tailed Lizard
  Lepidochelys Fitzinger, 1843 -- valid -- Ridley Sea Turtles
  Lepidochelys kempi (Garman, 1880) -- invalid -- Tortuga-marina escamosa-del Atlántico
  Lepidochelys kempii (Garman, 1880) -- valid -- Atlantic ridley, Atlantic Ridley Sea Turtle, Kemp's Ridley, Kemp's Ridley Sea Turtle
  Lepidochelys olivacea (Eschscholtz, 1829) -- valid -- Olive Ridley, Olive Ridley Sea Turtle, Pacific ridley, Pacific Ridley Sea Turtle, Tortuga-marina escamosa-del Pacífico
  Lepidochelys olivacea remivaga (Hay, 1908) -- invalid
  Lepidodactylus Fitzinger, 1843 -- valid -- Indo-Pacific Geckos, Scaly-toed Geckos
  Lepidodactylus lugubris (Duméril and Bibron, 1836) -- valid -- Mourning Gecko
  Lepidodactylus moestus (W. Peters, 1867) -- valid -- Micronesian Scaly-toed Gecko
  Lepidodactylus paurolepis Ota, Fisher, Ineich and Case, 1995 -- valid -- Palau Scaly-toed Gecko, Rock Islands Scaly-toed Gecko
  Lepidophyma alvarezi H. M. Smith, 1973 -- invalid -- Lagartija-nocturna de Álvarez del Toro
  Lepidophyma chicoasensis Álvarez and Valentin, 1988 -- valid -- Lagartija-nocturna del Sumidero, Sumidero Tropical Night Lizard
  Lepidophyma dontomasi (H. M. Smith, 1942) -- valid -- Lagartija-nocturna de MacDougall, MacDougall's Tropical Night Lizard
  Lepidophyma flavimaculatum Duméril, 1851 -- valid -- Lagartija-nocturna puntos amarillos, Yellow-spotted Night Lizard
  Lepidophyma gaigeae Mosauer, 1936 -- valid -- Gaige's Tropical Night Lizard, Lagartija-nocturna de Gaiger
  Lepidophyma lipetzi H. M. Smith and del Toro, 1977 -- valid -- Lagartija-nocturna del Ocote, Lipetz's Tropical Night Lizard
  Lepidophyma micropholis Walker, 1955 -- valid -- Cave Tropical Night Lizard, Lagartija-nocturna de cueva
  Lepidophyma occulor H. M. Smith, 1942 -- valid -- Japlan Tropical Night Lizard, Lagartija-nocturna de Jalapa
  Lepidophyma pajapanensis Werler, 1957 -- valid -- Lagartija-nocturna de Pajapan, Pajapan Tropical Night Lizard
  Lepidophyma radula (H. M. Smith, 1942) -- valid -- Lagartija-nocturna de Yautepec, Yautepec Tropical Night Lizard
  Lepidophyma sawini H. M. Smith, 1973 -- invalid -- Lagartija-nocturna de Sawin
  Lepidophyma smithii Bocourt, 1876 -- valid -- Smith's Tropical Night Lizard
  Lepidophyma sylvaticum Taylor, 1939 -- valid -- Lagartija-nocturna de montaña, Madrean Tropical Night Lizard
  Lepidophyma tarascae R. L. Bezy, Webb and Álvarez, 1982 -- valid -- Lagartija-nocturna tarasca, Tarascan Tropical Night Lizard
  Lepidophyma tuxtlae Werler and Shannon, 1957 -- valid -- Lagartija-nocturna de Los Tuxtlas, Tuxtla Tropical Night Lizard
  Lepidosauria -- invalid
  Lepidosternon floridanum Baird, 1858 -- invalid
  Lepospondyli -- invalid
  Leptodactylidae Werner, 1896 -- valid -- grenouilles néotropicales, Leptodactylid Frogs, Leptodactylids, Neotropical Frogs
  Leptodactylus Fitzinger, 1826 -- valid -- Foam-nest Frogs, Neotropical glass frogs, Neotropical Grass Frogs, Thin-toed Frogs, White-lipped Frogs
  Leptodactylus albilabris (Günther, 1859) -- valid -- Caribbean White-lipped Frog
  Leptodactylus labialis (Cope, 1877) -- invalid -- Rana-nidificadora labios blancos
  Leptodeira Fitzinger, 1843 -- valid -- Cat-eyed Snakes
  Leptodeira frenata (Cope, 1886) -- valid -- Culebra-ojo de gato de selva, Rainforest Cat-eyed Snake
  Leptodeira maculata (Hallowell, 1861) -- valid -- Culebra-ojo de gato del suroeste, Southwestern Cat-eyed Snake
  Leptodeira nigrofasciata Günther, 1868 -- valid -- Black-banded Cat-eyed Snake, Culebra-ojo de gato cabeza negra
  Leptodeira punctata (Peters, 1866) -- valid -- Culebra-ojo de gato occidental, Western Cat-eyed Snake
  Leptodeira septentrionalis (Kennicott in Baird, 1859) -- valid -- Cat-eyed Snake, Culebra-ojo de gato norteña o manchada, Northern Cat-eyed Snake
  Leptodeira splendida Günther, 1895 -- valid -- Culebra-ojo de gato espléndida, Splendid Cat-eyed Snake
  Leptophis diplotropis (Günther, 1872) -- valid -- Culebra-perico gargantilla, Pacific Coast Parrot Snake
  Leptophis mexicanus A. M. C. Duméril, Bibron and A. H. A. Duméril, 1854 -- valid -- Culebra-perico mexicana, Mexican Parrot Snake
  Leptophis modestus (Günther, 1872) -- valid -- Cloud Forest Parrot Snake, Culebra-perico de niebla
  Leptotyphlopidae Stejneger, 1892 -- valid -- Slender Blind Snakes, Thread Snakes, Threadsnakes
  Leptotyphlops Fitzinger, 1843 -- valid -- Slender Blind Snakes, Threadsnakes
  Leptotyphlops bressoni Taylor, 1939 -- invalid -- Serpiente-lombriz michoacana
  Leptotyphlops dulcis (Baird and Girard, 1853) -- invalid -- Serpiente-lombriz texana, Texas Slender Blind Snake, Texas Threadsnake
  Leptotyphlops goudotii (A. M. C. Duméril and Bibron, 1844) -- invalid
  Leptotyphlops maximus Loveridge, 1932 -- invalid -- Serpiente-lombriz gigante
  Leurognathus Moore, 1899 -- invalid -- Shovel-nosed Salamanders
  Leurognathus marmoratus Moore, 1899 -- invalid -- Shovel-nosed Salamander
  Liochlorophis Oldham and H. M. Smith, 1991 -- invalid -- Smooth Green Snakes
  Liochlorophis vernalis (Harlan, 1827) -- invalid -- Smooth Green Snake
  Lipinia Gray, 1845 -- valid -- Lipinias
  Lipinia leptosoma (Brown and Fehlmann, 1958) -- valid -- Palau Pandanus Skink, Pandanus Skink, Slender Lipinia
  Lipinia noctua (Lesson, 1830) -- invalid -- Moth Skink
  Lissamphibia -- invalid
  Lissemys Smith, 1931 -- valid -- Indian Flapshell Turtles
  Lissemys punctata (Lacépède, 1788) -- invalid -- Indian flapshell turtle
  Lissemys scutata (Peters, 1868) -- valid -- Burmese Flapshell Turtle
  Mabuya Fitzinger, 1826 -- valid -- Mabuyas
  Mabuya brachypoda Taylor, 1956 -- invalid -- Mabuya centroamericana
  Mabuya mabouya sloanii (Daudin, 1803) -- invalid
  Mabuya multicarinata (Gray, 1845) -- invalid -- Many-keeled Mabuya
  Mabuya sloanii (Daudin, 1803) -- invalid -- Slippery Back Skink, Slippery-backed Mabuya
  Macroclemys Gray, 1856 -- invalid -- alligator snapping turtles
  Macroclemys temminckii (Troost in Harlan, 1835) -- invalid -- alligator snapping turtle
  Macrovipera Reuss, 1927 -- valid
  Malaclemys Gray, 1844 -- valid -- Diamondback Terrapins
  Malaclemys littoralis Hay, 1905 -- invalid
  Malaclemys littoralis rhizophorarum Fowler, 1906 -- invalid
  Malaclemys macrospilota Hay, 1905 -- invalid
  Malaclemys pileata (Wied-Neuwied, 1865) -- invalid
  Malaclemys terrapin (Schoepff, 1793) -- valid -- Diamond-backed Terrapin, Diamondback Terrapin
  Malaclemys terrapin centrata (Latreille in Sonnini and Latreille, 1801) -- valid -- Carolina Diamond-backed Terrapin, Carolina Diamondback Terrapin
  Malaclemys terrapin littoralis Hay, 1905 -- valid -- Texas Diamond-backed Terrapin, Texas Diamondback Terrapin
  Malaclemys terrapin macrospilota Hay, 1905 -- valid -- Ornate Diamond-backed Terrapin, Ornate Diamondback Terrapin
  Malaclemys terrapin pileata (Wied-Neuwied, 1865) -- valid -- Mississippi Diamond-backed Terrapin, Mississippi Diamondback Terrapin
  Malaclemys terrapin rhizophorarum Fowler, 1906 -- valid -- Mangrove Diamond-backed Terrapin, Mangrove Diamondback Terrapin
  Malaclemys terrapin tequesta Schwartz, 1955 -- valid -- Eastern Florida Diamond-backed Terrapin, Eastern Florida Diamondback Terrapin, Florida East Coast Diamondback Terrapin
  Malaclemys terrapin terrapin (Schoepff, 1793) -- valid -- Northern Diamond-backed Terrapin, Northern Diamondback Terrapin
  Malacochersus Lindholm, 1929 -- valid -- Pancake Tortoises
  Malacochersus tornieri (Siebenrock, 1903) -- valid -- African Pancake Tortoise, Pancake Tortoise
  Malacoclemmys geographica (Le Sueur, 1817) -- invalid
  Malayemys Lindholm, 1931 -- valid -- Malayan Snail-eating Turtles
  Malayemys subtrijuga (Schlegel and Müller, 1845) -- valid -- Mekong Snail-eating Turtle
  Manolepis Cope, 1885 -- valid
  Manolepis putnami (Jan, 1863) -- valid -- Culebra cabeza surcada, Ridgehead Snake
  Manouria Gray, 1854 -- valid -- Indochinese Tortoises
  Manouria emys (Schlegel and Müller, 1840) -- valid -- Asian Brown Tortoise, Asian Giant Tortoise
  Manouria impressa (Günther, 1882) -- valid -- Impressed Tortoise
  Masticophis Baird and Girard, 1853 -- invalid -- Coachwhips, Racers, Striped Racers, Whipsnakes
  Masticophis anthonyi (Stejneger, 1901) -- invalid -- Culebra-chirriadora de Isla Clarion
  Masticophis aurigulus (Cope, 1861) -- invalid -- Culebra-chirriadora de Baja California
  Masticophis bilineatus Jan, 1863 -- invalid -- Culebra-chirriadora sonorense, Sonoran Whipsnake
  Masticophis flagellum (Shaw, 1802) -- invalid -- Coachwhip, Culebra-chirriadora común
  Masticophis lateralis (Hallowell, 1853) -- invalid -- Culebra-chirriadora rayada, Striped Racer
  Masticophis mentovarius (A. M. C. Duméril, Bibron and A. H. A. Duméril, 1854) -- invalid -- Culebra-chirriadora neotropical
  Masticophis schotti Baird and Girard, 1853 -- invalid -- Schott's Whipsnake
  Masticophis taeniatus (Hallowell, 1852) -- invalid -- Culebra-chirriadora adornada, Striped Whipsnake
  Mauremys Gray, 1869 -- valid -- Stripe-necked Turtles
  Mauremys caspica (Gmelin, 1774) -- valid -- Caspian Terrapin, Caspian Turtle
  Mauremys iversoni Pritchard and McCord, 1991 -- invalid -- Fujian Pond Turtle
  Mauremys japonica (Temminck and Schlegel, 1838) -- valid -- Japanese Pond Turtle
  Mauremys leprosa (Schweigger, 1812) -- valid -- Mediterranean Pond Turtle, Mediterranean Turtle, Spanish Terrapin
  Mauremys mutica (Cantor, 1842) -- valid -- Yellow Pond Turtle
  Mecistops Gray, 1844 -- valid -- African Gavial, African Sharp-nosed Crocodile, African Slender-snouted Crocodile
  Mecistops cataphractus (Cuvier, 1825) -- valid -- African Gavial, African Sharp-nosed Crocodile, African Slender-snouted Crocodile
  Melanochelys Gray, 1869 -- valid -- Indian Black Turtles
  Melanochelys tricarinata (Blyth, 1856) -- valid -- Three-keeled Land Turtle, Tricarinate Hill Turtle
  Melanochelys trijuga (Schweigger, 1812) -- valid -- Indian Black Turtle
  Melanosuchus Gray, 1862 -- valid -- Black Caiman
  Melanosuchus niger (Spix, 1825) -- valid -- Black Caiman
  Mesaspis Cope, 1877 -- invalid
  Mesaspis antauges (Cope, 1866) -- invalid -- Lagarto escorpión de Monte Orizaba, Mount Orizaba Alligator Lizard
  Mesaspis gadovii (Boulenger, 1913) -- invalid -- Gadow's Alligator Lizard
  Mesaspis juarezi (Karges and Wright, 1987) -- invalid -- Lagarto escorpión de Sierra de Juárez, Sierra Juarez Alligator Lizard
  Mesaspis moreleti (Bocourt, 1871) -- invalid -- Lagarto escorpión de Morelet
  Mesaspis viridiflava (Bocourt, 1873) -- invalid -- Dwarf Alligator Lizard, Lagarto escorpión enano
  Mesoclemmys Gray, 1873 -- valid
  Microhylidae Günther, 1858 -- valid -- Microhylid Frogs, Microhylids
  Micruroides K. P. Schmidt, 1928 -- valid -- Sonoran Coralsnakes, Western Coral Snakes
  Micruroides euryxanthus (Kennicott, 1860) -- valid -- Serpiente-coralillo sonorense, Sonoran Coralsnake, Western Coral Snake
  Micrurus Wagler, 1824 -- valid -- American Coral Snakes, American Coralsnakes
  Micrurus annellatus balzani (Boulenger, 1898) -- valid
  Micrurus annellatus balzanii (Boulenger, 1898) -- invalid
  Micrurus bogerti Roze, 1967 -- valid -- Bogert's Coral Snake, Serpiente-coralillo de Bogert
  Micrurus browni K. P. Schmidt and H. M. Smith, 1943 -- valid -- Brown's Coral Snake, Serpiente-coralillo de Brown
  Micrurus diastema (A. M. C. Duméril, Bibron and A. H. A. Duméril, 1854) -- valid -- Diastema Coral Snake, Serpiente-coralillo variable, Variable Coral Snake
  Micrurus distans (Kennicott, 1860) -- valid -- Serpiente-coralillo del oeste mexicano, West Mexican Coral Snake
  Micrurus elegans (Jan, 1858) -- valid -- Elegant Coral Snake, Serpiente-coralillo elegante
  Micrurus ephippifer (Cope, 1886) -- valid -- Oaxacan Coral Snake, Serpiente-coralillo oaxaqueña
  Micrurus fulvius (Linnaeus, 1766) -- valid -- Eastern Coral Snake, Harlequin Coralsnake, Northern Coral Snake, Serpiente-coralillo arlequín
  Micrurus hippocrepis (W. C. H. Peters, 1862) -- valid -- Mayan Coral Snake
  Micrurus laticollaris (W. C. H. Peters, 1870) -- valid -- Balsas Coral Snake, Serpiente-coralillo del Balsas
  Micrurus latifasciatus K. P. Schmidt, 1933 -- valid -- Broad-ringed Coral Snake, Serpiente-coralillo franjas anchas
  Micrurus limbatus Fraser, 1964 -- valid -- Serpiente-coralillo de Los Tuxtlas, Tuxtlan Coral Snake
  Micrurus margaritifer Roze, 1967 -- valid -- Speckled Coral Snake
  Micrurus nebularis Roze, 1989 -- valid -- Cloud Forest Coral Snake, Serpiente-coralillo de niebla
  Micrurus nigrocinctus (Girard, 1854) -- valid -- Central American Coral Snake, Serpiente-coralillo centroamericana
  Micrurus proximans H. M. Smith and Chrapliwy, 1958 -- valid -- Nayarit Coral Snake, Serpiente-coralillo nayarita
  Mixcoatlus Jadin, H. M. Smith and Campbell, 2011 -- valid
  Montatheris Broadley, 1996 -- valid
  Montivipera Nilson, Tuniyev, Andrén, Orlov, Joger and Herrmann, 1999 -- valid
  Morenia Gray, 1870 -- valid -- Eyed Turtles
  Morenia ocellata (Duméril and Bibron, 1835) -- valid -- Burmese Eyed Turtle
  Morenia petersi (Anderson, 1879) -- valid -- Indian Eyed Turtle
  Nactus Kluge, 1983 -- valid -- Hook-toed Geckos
  Nactus pelagicus (Girard, 1858) -- valid -- Pelagic Gecko
  Nadzikambia Tilbury, Tolley and Branch, 2006 -- valid
  Nadzikambia mlanjense (Broadley, 1965) -- invalid
  Nadzikambia mlanjensis (Broadley, 1965) -- valid
  Natator McCulloch, 1908 -- valid -- Flatback Turtles
  Natator depressa (Garman, 1880) -- invalid -- flatback turtle
  Necturus Rafinesque, 1819 -- valid -- Mudpuppies, Waterdogs
  Necturus alabamensis Viosca, 1937 -- valid -- Alabama Waterdog, Black Warrior River Waterdog, Black Warrior Waterdog
  Necturus beyeri Viosca, 1937 -- valid -- Gulf Coast Waterdog
  Necturus lewisi Brimley, 1924 -- valid -- Neuse River Waterdog
  Necturus maculosus (Rafinesque, 1818) -- valid -- Mudpuppy, necture tacheté
  Necturus punctatus (Gibbes, 1850) -- valid -- Dwarf Waterdog
  Neoseps Stejneger, 1910 -- invalid -- Florida Sand Skinks
  Neoseps reynoldsi Stejneger, 1910 -- invalid -- Florida Sand Skink, Sand Skink
  Nerodia Baird and Girard, 1853 -- valid -- North American Water Snakes, Water Snakes
  Nerodia clarkii (Baird and Girard, 1853) -- valid -- Gulf salt marsh snake, Salt Marsh Snake, Salt Marsh Water Snake, Saltmarsh Snake
  Nerodia cyclopion (A. M. C. Duméril, Bibron and A. H. A. Duméril, 1854) -- valid -- Green Water Snake, Mississippi Green Water Snake, Mississippi Green Watersnake
  Nerodia erythrogaster (Forster in Bossu, 1771) -- valid -- Culebra-de agua vientre claro, Plain-bellied Water Snake, Plain-bellied Watersnake, Plainbelly Water Snake, Red-bellied Water Snake, Redbelly Water Snake
  Nerodia fasciata (Linnaeus, 1766) -- valid -- Southern Water Snake, Southern Watersnake
  Nerodia floridana (Goff, 1936) -- valid -- Florida Green Water Snake, Florida Green Watersnake
  Nerodia harteri (Trapido, 1941) -- valid -- Brazos River Water Snake, Brazos River Watersnake, Brazos Water Snake, Harter's Water Snake, Harters Water Snake
  Nerodia melanogaster (Peters, 1864) -- invalid -- Culebra-de agua vientre negro
  Nerodia paucimaculata (Tinkle and Conant, 1961) -- valid -- Concho Water Snake, Concho Watersnake
  Nerodia rhombifer (Hallowell, 1852) -- valid -- Culebra-de agua de diamantes, Diamond-backed Watersnake, Diamondback Water Snake
  Nerodia rufipunctatus (Cope, 1875) -- invalid -- Culebra-de agua cabeza angosta
  Nerodia sipedon (Linnaeus, 1758) -- valid -- Common Watersnake, couleuvre d'eau, Northern Water Snake
  Nerodia taxispilota (Holbrook, 1838) -- valid -- Brown Water Snake, Brown Watersnake
  Nilssonia Gray, 1872 -- valid -- Burmese Peacock Softshell Turtles
  Nilssonia formosa (Gray, 1869) -- valid -- Burmese Peacock Softshell Turtle
  Ninia diademata Baird and Girard, 1853 -- valid -- Culebra-de cafetal de collar, Veracruz Ringneck Coffee Snake
  Ninia sebae (A. M. C. Duméril, Bibron and A. H. A. Duméril, 1854) -- valid -- Culebra-de cafetal espalda roja, Redback Coffee Snake
  Norops Wagler, 1830 -- invalid -- Beta Anoles
  Norops adleri (H. M. Smith, 1972) -- invalid
  Norops anisolepis (H. M. Smith, Burley and Fritts, 1968) -- invalid
  Norops baccatus (Bocourt, 1873) -- invalid
  Norops barkeri (K. P. Schmidt, 1939) -- invalid
  Norops biporcatus (Wiegmann, 1834) -- invalid
  Norops breedlovei (H. M. Smith and Paulson, 1968) -- invalid
  Norops capito (W. C. H. Peters, 1863) -- invalid
  Norops compressicaudus (H. M. Smith and Kerster, 1955) -- invalid
  Norops crassulus (Cope, 1864) -- invalid
  Norops cumingii (W. C. H. Peters, 1863) -- invalid
  Norops cuprinus (H. M. Smith, 1964) -- invalid
  Norops cymbops (Cope, 1864) -- invalid
  Norops dollfusianus (Bocourt, 1873) -- invalid
  Norops duellmani (Fitch and Henderson, 1973) -- invalid
  Norops dunni (H. M. Smith, 1936) -- invalid
  Norops gadovii (Boulenger, 1905) -- invalid
  Norops garmani (Stejneger, 1899) -- invalid -- Jamaican Giant Anole, Jamaican Giant Anoles
  Norops isthmicus (Fitch, 1978) -- invalid
  Norops laeviventris (Wiegmann, 1834) -- invalid
  Norops lemurinus (Cope, 1861) -- invalid
  Norops liogaster (Boulenger, 1905) -- invalid
  Norops macrinii (H. M. Smith, 1968) -- invalid
  Norops matudai (H. M. Smith, 1956) -- invalid
  Norops megapholidotus (H. M. Smith, 1933) -- invalid
  Norops microlepidotus (Davis, 1954) -- invalid
  Norops milleri (H. M. Smith in H. M. Smith and Taylor, 1950) -- invalid
  Norops naufragus Campbell, Hillis and Lamar, 1989 -- invalid
  Norops nebuloides (Bocourt, 1873) -- invalid
  Norops nebulosus (Wiegmann, 1834) -- invalid
  Norops omiltemanus (Davis, 1954) -- invalid
  Norops parvicirculatus (Álvarez del Toro and H. M. Smith, 1956) -- invalid
  Norops pentaprion (Cope, 1863) -- invalid
  Norops petersii (Bocourt, 1873) -- invalid
  Norops polyrhachis (H. M. Smith, 1968) -- invalid
  Norops pygmaeus (Álvarez del Toro and H. M. Smith, 1956) -- invalid
  Norops quercorum (Fitch, 1978) -- invalid
  Norops rodriguezi (Bocourt, 1873) -- invalid
  Norops sagrei (Cocteau in A. M. C. Duméril and Bibron, 1837) -- invalid -- Brown Anole
  Norops schiedii (Wiegmann, 1834) -- invalid
  Norops schmidti (H. M. Smith, 1939) -- invalid
  Norops sericeus (Hallowell, 1856) -- invalid
  Norops simmonsi (Holman, 1964) -- invalid
  Norops subocularis (Davis, 1954) -- invalid
  Norops taylori (H. M. Smith and Spieler, 1945) -- invalid
  Norops tropidonotus (W. C. H. Peters, 1863) -- invalid
  Norops uniformis (Cope, 1885) -- invalid
  Norops utowanae (Barbour, 1932) -- invalid
  Notochelys Gray, 1863 -- valid -- Malayan Flat-shelled Turtles
  Notochelys platynota (Gray, 1834) -- valid -- Malayan Flat-shelled Turtle
  Notophthalmus Rafinesque, 1820 -- valid -- Eastern Newts, North American Newts
  Notophthalmus meridionalis (Cope, 1880) -- valid -- Black-spotted Newt, Tritón manchas negras
  Notophthalmus perstriatus (Bishop, 1941) -- valid -- Striped Newt
  Notophthalmus viridescens (Rafinesque, 1820) -- valid -- Eastern Newt, triton vert
  Nototriton adelos Papenfuss and Wake, 1987 -- invalid -- Salamandra de Sierra de Juárez
  Nototriton alvarezdeltoroi Papenfuss and Wake, 1987 -- invalid -- Salamandra de Álvarez del Toro
  Nototriton nasalis (Dunn, 1924) -- invalid
  Nyctanolis Elias and Wake, 1983 -- valid -- long-limbed salamanders
  Nyctanolis pernix Elias and Wake, 1983 -- valid -- Salamandra-patas largas ágil
  Ocadia Gray, 1870 -- invalid -- Chinese stripe-necked turtles, Striped-necked Turtles
  Ocadia philippeni (McCord and Iverson, 1992) -- invalid -- Philippen's Stripe-necked Turtle
  Ocadia sinensis (Gray, 1834) -- invalid -- Chinese stripe-necked turtle, Chinese Striped-necked Turtle
  Ololygon Fitzinger, 1843 -- valid
  Ololygon staufferi (Cope, 1865) -- invalid -- Rana-de árbol de Stauffer
  Opheodrys Fitzinger, 1843 -- valid -- Green Snakes, Greensnakes
  Opheodrys aestivus (Linnaeus, 1766) -- valid -- Culebra-verde rugosa, Rough Green Snake, Rough Greensnake
  Ophisaurus Daudin, 1803 -- valid -- Glass Lizards
  Ophisaurus attenuatus Baird in Cope, 1880 -- valid -- Slender Glass Lizard
  Ophisaurus ceroni Holman, 1965 -- valid -- Ceron's Glass Lizard, Lagarto de cristal de Ceron
  Ophisaurus compressus Cope, 1900 -- valid -- Island Glass Lizard
  Ophisaurus incomptus McConkey, 1955 -- valid -- Lagarto de cristal cuello simple, Plainneck Glass Lizard
  Ophisaurus mimicus Palmer, 1987 -- valid -- Mimic Glass Lizard
  Ophisaurus ventralis (Linnaeus, 1766) -- valid -- Eastern Glass Lizard
  Ophryacus Cope, 1887 -- valid
  Ophryacus melanurus (Müller, 1924) -- invalid
  Ophryacus undulatus (Jan, 1859) -- valid -- Mexican Horned Pit Viper, Slender-horned Pitviper
  Orlitia Gray, 1873 -- valid -- Malaysian Giant Turtles
  Orlitia borneensis Gray, 1873 -- valid -- Malaysian Giant Turtle
  Osteolaemus Cope, 1861 -- valid -- Dwarf Crocodiles
  Osteolaemus tetraspis Cope, 1861 -- valid -- African Dwarf Crocodile, Broad-nosed Crocodile, Dwarf Crocodile, West African Dwarf Crocodile
  Osteolaemus tetraspis osborni (Schmidt, 1919) -- invalid -- Congo Dwarf Crocodile
  Osteolaemus tetraspis tetraspis Cope, 1861 -- invalid -- African Dwarf Crocodile, Broad-nosed Crocodile, Dwarf Crocodile, West African Dwarf Crocodile
  Osteopilus Fitzinger, 1843 -- valid -- West Indian Treefrogs
  Osteopilus septentrionalis (Duméril and Bibron, 1841) -- valid -- Cuban Treefrog
  Ovophis Burger, 1981 -- valid
  Ovophis monticola zhaokentangi Zhao, 1995 -- invalid
  Oxybelis Wagler, 1830 -- valid -- Vine Snakes, Vinesnakes
  Oxybelis aeneus (Wagler, 1824) -- valid -- Brown Vine Snake, Brown Vinesnake, Culebra-bejuquilla mexicana, Mexican Vine Snake
  Palea Meylan, 1987 -- valid -- wattle-necked softshell turtle, Wattle-necked Softshell Turtles, Wattle-necked Softshells
  Palea steindachneri (Siebenrock, 1906) -- valid -- Wattle-necked Softshell, Wattle-necked Softshell Turtle
  Paleosuchus Gray, 1862 -- valid -- musky caimans, smooth-fronted caimans
  Paleosuchus palpebrosus (Cuvier, 1807) -- valid -- Cuvier's Smooth-fronted Caiman, Dwarf Caiman, Musky Caiman
  Paleosuchus trigonatus (Schneider, 1801) -- valid -- Cachirre, Jacaré coroa, Schneider's Smooth-fronted Caiman
  Paratelmatobius pictiventris Lutz in Lutz and Carvalho, 1958 -- invalid
  Pelamis Daudin, 1803 -- invalid -- Yellow-bellied Sea Snakes, Yellow-bellied Seasnakes
  Pelamis platurus (Linnaeus, 1766) -- invalid -- Serpiente-marina pelágica, Yellow-bellied Sea Snake, Yellow-bellied Seasnake
  Pelobatidae Bonaparte, 1850 -- valid -- Archaic Frogs, Pelobatids, Spadefoots
  Pelochelys Gray, 1864 -- valid -- Asian Giant Softshell Turtles
  Pelochelys bibroni (Owen, 1853) -- valid -- Asian Giant Softshell Turtle, New Guinea Giant Softshell Turtle
  Pelodiscus Fitzinger, 1835 -- valid -- Chinese Softshell Turtle, Chinese Softshells
  Pelodiscus sinensis (Wiegmann, 1835) -- valid -- Chinese Softshell, Chinese Softshell Turtle
  Pelomedusa Wagler, 1830 -- valid -- Helmeted Turtles
  Pelomedusa subrufa (Lacépède, 1788) -- invalid -- helmeted turtle
  Pelomedusidae Cope, 1868 -- valid -- African Mud Terrapins, Afro-American side-necked turtles, hidden-necked turtles
  Peltocephalus Duméril and Bibron, 1835 -- valid -- Big-headed Amazon River Turtles
  Peltocephalus dumerilianus (Schweigger, 1812) -- valid -- big-headed Amazon River turtle, Big-headed Sideneck Turtle
  Peltophryne Fitzinger, 1843 -- valid -- West Indian Toads
  Peltophryne lemur Cope, 1869 -- valid -- Puerto Rican Crested Toad, Ridge-headed Toad
  Pelusios Wagler, 1830 -- valid -- African Hinged Terrapins
  Pelusios adansonii (Schweigger, 1812) -- valid -- Adanson's Mud Turtle
  Pelusios bechuanicus FitzSimons, 1932 -- valid -- Okavango Mud Turtle
  Pelusios broadleyi Bour, 1986 -- valid -- Turkana Mud Turtle
  Pelusios carinatus Laurent, 1956 -- valid -- African Keeled Mud Turtle
  Pelusios castaneus (Schweigger, 1812) -- valid -- West African Mud Turtle
  Pelusios castanoides Hewitt, 1931 -- valid -- Yellow-bellied Mud Turtle
  Pelusios chapini Laurent, 1965 -- valid -- Central African Mud Turtle
  Pelusios gabonensis (Duméril, 1856) -- valid -- African Forest Turtle
  Pelusios nanus Laurent, 1956 -- valid -- African Dwarf Mud Turtle
  Pelusios niger (Duméril and Bibron, 1835) -- valid -- West African Black Mud Turtle, West African Black Turtle
  Pelusios rhodesianus Hewitt, 1927 -- valid -- Mashona Hinged Terrapin, Variable Mud Turtle
  Pelusios seychellensis (Siebenrock, 1906) -- invalid -- Seychelles Mud Turtle
  Pelusios sinuatus (Smith, 1838) -- valid -- East African Serrated Mud Turtle, Serrated Hinged Terrapin
  Pelusios subniger (Lacépède, 1788) -- invalid -- East African Black Mud Terrapin, East African black mud turtle
  Pelusios upembae Broadley, 1981 -- valid -- Upemba Mud Turtle
  Pelusios williamsi Laurent, 1965 -- valid -- Williams' Mud Turtle
  Perochirus Boulenger, 1885 -- valid -- Micronesian Geckos, Polynesian Geckos
  Perochirus ateles (Duméril, 1856) -- valid -- Fragile Micronesian Gecko, Fragile Polynesian Gecko
  Perochirus scutellatus (Fischer, 1882) -- valid -- Giant Micronesian Gecko
  Petrosaurus Boulenger, 1885 -- valid -- Rock Lizards
  Petrosaurus mearnsi (Stejneger, 1894) -- valid -- Banded Rock Lizard, Lagartija-de piedra rayada
  Petrosaurus thalassinus (Cope, 1863) -- valid -- Baja California Rock Lizard, Lagartija-de piedra bajacaliforniana
  Phaeognathus Highton, 1961 -- valid -- Red Hills Salamanders
  Phaeognathus hubrichti Highton, 1961 -- valid -- Red Hills Salamander
  Phasmahyla guttata (Lutz, 1924) -- valid
  Phelsuma Gray, 1825 -- valid -- Day Geckos
  Phelsuma guimbeaui Mertens, 1963 -- valid -- Mauritius Forest Day Gecko, Orange-spotted Day Gecko
  Phelsuma laticauda (Boettger, 1880) -- valid -- Broad-tailed Day Gecko, Gold Dust Day Gecko
  Phrynocerus testudiniceps Cope, 1862 -- valid
  Phrynops Wagler, 1830 -- valid -- Toad-headed Turtles
  Phrynops dahli Zangerl and Medem, 1958 -- invalid -- Dahl's Toad-headed Turtle
  Phrynops geoffroanus (Schweigger, 1812) -- valid -- Geoffroy's Side-necked Turtle
  Phrynops gibbus (Schweigger, 1812) -- invalid -- Gibba Turtle
  Phrynops hilarii (Duméril and Bibron, 1835) -- valid -- Hilaire's Side-necked Turtle
  Phrynops hogei Mertens, 1967 -- invalid -- Brazilian Sideneck Turtle, Hoge's Side-necked Turtle, Hoge's Sideneck Turtle
  Phrynops nasutus (Schweigger, 1812) -- invalid -- Common Toad-headed Turtle
  Phrynops raniceps (Gray, 1856) -- invalid -- Amazon toad-headed turtle
  Phrynops rufipes (Spix, 1824) -- invalid -- Red Side-necked Turtle
  Phrynops tuberculatus (Luederwaldt, 1926) -- invalid -- Tuberculate Toad-headed Turtle
  Phrynops vanderhaegei Bour, 1973 -- invalid -- Vanderhaege's Toad-headed Turtle
  Phrynops williamsi Rhodin and Mittermeier, 1983 -- valid -- Williams' Side-necked Turtle
  Phrynops zuliae Pritchard and Trebbau, 1984 -- invalid -- Zulia Toad-headed Turtle
  Phrynosoma Wiegmann, 1828 -- valid -- Horned Lizards
  Phrynosoma asio Cope, 1864 -- valid -- Giant Horned Lizard, Lagartija-cornuda gigante
  Phrynosoma braconnieri A. M. C. Duméril and Bocourt, 1870 -- valid -- Lagartija-cornuda cola corta, Short-tail Horned Lizard
  Phrynosoma cerroense Stejneger, 1893 -- valid -- Cedros Island Horned Lizard, Lagartija-cornuda de Isla Cedros
  Phrynosoma cornutum (Harlan, 1825) -- valid -- Lagartija-cornuda texana, Texas Horned Lizard
  Phrynosoma coronatum (Blainville, 1835) -- valid -- Coast Horned Lizard, Lagartija-cornuda de litoral
  Phrynosoma coronatum blainvillii Gray, 1839 -- invalid -- San Diego Horned Lizard
  Phrynosoma ditmarsi Stejneger, 1906 -- valid -- Lagartija-cornuda de roca, Rock Horned Lizard
  Phrynosoma douglasii (Bell, 1829) -- valid -- Pigmy Short-horned Lizard, Pygmy Short-horned Lizard, Short-horned Lizard
  Phrynosoma hernandesi Girard, 1858 -- valid -- Greater Short-horned Lizard, Hernandez's Short-horned Lizard, Mountain Short-horned Lizard
  Phrynosoma hernandesi hernandesi Girard, 1858 -- valid -- Hernandez's Short-horned Lizard, Mountain Short-horned Lizard
  Phrynosoma mcallii (Hallowell, 1852) -- valid -- Flat-tail Horned Lizard, Flat-tailed Horned Lizard, Lagartija-cornuda cola plana
  Phrynosoma modestum Girard in Baird and Girard, 1852 -- valid -- Lagartija-cornuda cola redonda, Round-tailed Horned Lizard, Roundtail Horned Lizard
  Phrynosoma orbiculare (Linnaeus, 1758) -- valid -- Lagartija-cornuda de montaña, Mountain Horned Lizard
  Phrynosoma platyrhinos Girard in Baird and Girard, 1852 -- valid -- Desert Horned Lizard, Lagartija-cornuda de desierto
  Phrynosoma solare Gray, 1845 -- valid -- Lagartija-cornuda real, Regal Horned Lizard
  Phrynosoma taurus Bocourt in A. M. C. Duméril and Bocourt, 1870 -- valid -- Lagartija-cornuda toro o mexicana, Mexican Horned Lizard
  Phrynosomatidae -- valid -- North American Spiny Lizards
  Phyllodactylus Gray, 1828 -- valid -- Leaf-toed Geckos
  Phyllodactylus angelensis Dixon, 1966 -- valid -- Salamanquesa de Isla Ángel
  Phyllodactylus apricus Dixon, 1966 -- valid -- Salamanquesa de Las Ánimas
  Phyllodactylus bordai Taylor, 1942 -- valid -- Salamanquesa de Guerrero
  Phyllodactylus bugastrolepis Dixon, 1966 -- valid -- Salamanquesa de Isla Catalina
  Phyllodactylus davisi Dixon, 1964 -- valid -- Salamanquesa de Davis
  Phyllodactylus delcampoi Mosauer, 1936 -- valid -- Salamanquesa de Del Campo
  Phyllodactylus duellmani Dixon, 1960 -- valid -- Salamanquesa de Duellman
  Phyllodactylus homolepidurus H. Smith, 1935 -- valid -- Salamanquesa sonorense
  Phyllodactylus lanei H. Smith, 1935 -- valid -- Salamanquesa patas de res
  Phyllodactylus muralis Taylor, 1940 -- valid -- Salamanquesa oaxaqueña
  Phyllodactylus nocticolus Dixon, 1964 -- valid -- Peninsula Leaf-toed Gecko, Peninsular Leaf-toed Gecko, Salamanquesa insular
  Phyllodactylus partidus Dixon, 1966 -- valid -- Salamanquesa de partida norte
  Phyllodactylus paucituberculatus Dixon, 1960 -- valid -- Salamanquesa de río Marqués
  Phyllodactylus santacruzensis Dixon, 1966 -- valid -- Salamanquesa de Santa Cruz
  Phyllodactylus tinklei Dixon, 1966 -- valid -- Salamanquesa de Isla Rasa
  Phyllodactylus tuberculosus Wiegmann, 1834 -- valid -- Salamanquesa vientre amarillo
  Phyllodactylus unctus (Cope, 1863) -- valid -- Salamanquesa de San Lucas
  Phyllodactylus wirshingi Kerster and H. Smith, 1955 -- valid -- Greater Antillean Leaf-toed Gecko
  Phyllodactylus xanti Cope, 1863 -- valid -- Salamanquesa del Cabo, Xantus Leaf-toed Gecko
  Phyllodactylus xanti nocticolus Dixon, 1964 -- invalid -- Peninsula Leaf-toed Gecko
  Phyllodactylus xanti xanti Cope, 1863 -- invalid
  Phyllomedusa ayeaye (Lutz, 1966) -- invalid
  Phyllomedusa tarsius (Cope, 1868) -- valid
  Phyllorhynchus Stejneger, 1890 -- valid -- Leaf-nosed Snakes
  Phyllorhynchus browni Stejneger, 1890 -- valid -- Culebra-nariz lanceolada ensillada, Maricopa Leafnose Snake, Pima Leafnose Snake, Saddled Leaf-nosed Snake, Saddled Leafnose Snake
  Phyllorhynchus decurtatus (Cope, 1868) -- valid -- Culebra-nariz lanceolada pinta, Spotted Leaf-nosed Snake, Spotted Leafnose Snake
  Physignathus Cuvier, 1829 -- valid
  Pipidae Gray, 1825 -- valid -- Tongueless Frogs
  Pituophis Holbrook, 1842 -- valid -- Bullsnakes, Gopher Snakes, Gophersnakes, Pine Snakes, Pinesnakes
  Pituophis catenifer (Blainville, 1835) -- valid -- Bullsnake, Gopher Snake, Gophersnake
  Pituophis deppei (A. M. C. Duméril, 1853) -- valid -- Culebra-sorda mexicana, Mexican Bull Snake, Mexican Pine Snake
  Pituophis lineaticollis (Cope, 1861) -- valid -- Cincuate Bull Snake, Culebra-sorda centroamericana, Middle American Gopher Snake
  Pituophis melanoleucus (Daudin, 1803) -- valid -- Culebra-sorda toro, Eastern Pine Snake, Eastern Pinesnake, Pine Snake, Pinesnake
  Pituophis ruthveni Stull, 1929 -- valid -- Louisiana Pine Snake, Louisiana Pinesnake
  Platemys Wagler, 1830 -- valid -- Twisted-necked Turtles
  Platemys platycephala (Schneider, 1792) -- valid -- Twist-necked Turtle, Twisted-neck Turtle
  Platymantis Günther, 1858 -- valid -- Ground Frogs
  Platymantis pelewensis Peters, 1867 -- invalid -- Palau Ground Frog
  Platysternidae Gray, 1869 -- valid -- Big-headed Turtles
  Platysternon Gray, 1831 -- valid -- Big-headed Turtles
  Platysternon megacephalum Gray, 1831 -- valid -- Big-headed Turtle
  Plestiodon egregius Baird, 1858 -- valid -- Mole Skink
  Plestiodon multivirgatum Hallowell, 1857 -- invalid
  Plestiodon obsoletum Baird and Girard, 1852 -- invalid
  Plestiodon onocrepis Cope, 1871 -- invalid
  Plestiodon septentrionalis Baird, 1858 -- valid -- Northern Prairie Skink, Prairie Skink
  Plestiodon skiltonianum Baird and Girard, 1852 -- invalid
  Plestiodon skiltonianum amblygrammus Cope, 1900 -- invalid
  Plethodon Tschudi, 1838 -- valid -- Woodland Salamanders
  Plethodon albagula Grobman, 1944 -- valid -- Western Slimy Salamander
  Plethodon aureolus Highton, 1984 -- valid -- Tellico Salamander
  Plethodon caddoensis Pope and Pope, 1951 -- valid -- Caddo Mountain Salamander
  Plethodon chattahoochee Highton in Highton, Maha and Maxson, 1989 -- valid -- Chattahoochee Slimy Salamander
  Plethodon chlorobryonis Mittleman, 1951 -- valid -- Atlantic Coast Slimy Salamander
  Plethodon cinereus (Green, 1818) -- valid -- Eastern Red-backed Salamander, Red-backed Salamander, Redback Salamander, salamandre rayée
  Plethodon cylindraceus (Harlan, 1825) -- valid -- White-spotted Slimy Salamander
  Plethodon dorsalis Cope, 1889 -- valid -- Northern Zigzag Salamander, Zig-zag Salamander, Zigzag Salamander
  Plethodon dunni Bishop, 1934 -- valid -- Dunn's Salamander
  Plethodon elongatus Van Denburgh, 1916 -- valid -- Del Norte Salamander
  Plethodon fourchensis Duncan and Highton, 1979 -- valid -- Fourche Mountain Salamander
  Plethodon glutinosus (Green, 1818) -- valid -- Northern Slimy Salamander, Slimy Salamander
  Plethodon grobmani Allen and Neill, 1949 -- valid -- Southeastern Slimy Salamander
  Plethodon hoffmani Highton, 1972 -- valid -- Valley and Ridge Salamander
  Plethodon hubrichti Thurow, 1957 -- valid -- Peaks of Otter Salamander
  Plethodon idahoensis Slater and Slipp, 1940 -- valid -- Coeur d'Alene Salamander
  Plethodon jordani Blatchley, 1901 -- valid -- Appalachian Salamander, Jordan's Salamander, Red-cheeked Salamander
  Plethodon kentucki Mittleman, 1951 -- valid -- Cumberland Plateau Salamander, Kentucky Salamander
  Plethodon kiamichi Highton in Highton, Maha and Maxson, 1989 -- valid -- Kiamichi Slimy Salamander
  Plethodon kisatchie Highton in Highton, Maha and Maxson, 1989 -- valid -- Louisiana Slimy Salamander
  Plethodon larselli Burns, 1954 -- valid -- Larch Mountain Salamander
  Plethodon mississippi Highton in Highton, Maha and Maxson, 1989 -- valid -- Mississippi Slimy Salamander
  Plethodon neomexicanus Stebbins and Riemer, 1950 -- valid -- Jemez Mountains Salamander
  Plethodon nettingi Green, 1938 -- valid -- Cheat Mountain Salamander
  Plethodon ocmulgee Highton in Highton, Maha and Maxson, 1989 -- valid -- Ocmulgee Slimy Salamander
  Plethodon ouachitae Dunn and Heinze, 1933 -- valid -- Rich Mountain Salamander
  Plethodon petraeus Wynn, Highton and Jacobs, 1988 -- valid -- Pigeon Mountain Salamander
  Plethodon punctatus Highton, 1972 -- valid -- Cow Knob Salamander, White Spotted Salamander, White-spotted Salamander
  Plethodon richmondi Netting and Mittleman, 1938 -- valid -- Ravine Salamander, Southern Ravine Salamander
  Plethodon savannah Highton in Highton, Maha and Maxson, 1989 -- valid -- Savannah Slimy Salamander
  Plethodon sequoyah Highton in Highton, Maha and Maxson, 1989 -- valid -- Sequoyah Slimy Salamander
  Plethodon serratus Grobman, 1944 -- valid -- Southern Red-backed Salamander
  Plethodon shenandoah Highton and Worthington, 1967 -- valid -- Shenandoah Salamander
  Plethodon stormi Highton and Brame, 1965 -- valid -- Siskiyou Mountains Salamander
  Plethodon teyahalee Hairston, 1950 -- valid -- Southern Appalachian Salamander
  Plethodon vandykei Van Denburgh, 1906 -- valid -- Van Dyke's Salamander
  Plethodon variolatus (Gilliams, 1818) -- valid -- South Carolina Slimy Salamander
  Plethodon vehiculum (Cooper, 1860) -- valid -- Western Red-backed Salamander
  Plethodon websteri Highton, 1979 -- valid -- Webster's Salamander
  Plethodon wehrlei Fowler and Dunn, 1917 -- valid -- Wehrle's Salamander
  Plethodon welleri Walker, 1931 -- valid -- Weller's Salamander
  Plethodon yonahlossee Dunn, 1917 -- valid -- Yonahlossee Salamander
  Plethodontidae Gray, 1850 -- valid -- Lungless Salamanders
  Plethodontinae Gray, 1850 -- valid -- Plethodontine Salamanders
  Pliocercus Cope, 1860 -- valid
  Pliocercus andrewsi H. M. Smith, 1942 -- invalid -- Culebra-imita coral de Andrew
  Pliocercus bicolor H. M. Smith, 1941 -- invalid -- Culebra-imita coral bicolor
  Pliocercus elapoides Cope, 1860 -- valid -- Culebra-imita coral común, Variegated False Coral Snake
  Podarcis Wagler, 1830 -- valid -- Wall Lizards
  Podarcis muralis (Laurenti, 1768) -- valid -- Common Wall Lizard
  Podarcis sicula (Rafinesque-Schmaltz, 1810) -- invalid -- Italian Wall Lizard
  Podocnemis Wagler, 1830 -- valid -- South American Side-necked River Turtles
  Podocnemis erythrocephala (Spix, 1824) -- valid -- Red-headed Amazon River Turtle, Red-headed River Turtle
  Podocnemis expansa (Schweigger, 1812) -- valid -- Arrau, Giant Amazon River Turtle, Giant South American River Turtle, South American River Turtle, tartaruga, True Amazon Turtle
  Podocnemis lewyana Duméril, 1852 -- valid -- Magdalena River Turtle
  Podocnemis sextuberculata Cornalia, 1849 -- valid -- Six-tubercled Amazon River Turtle, Six-tubercled River Turtle
  Podocnemis unifilis Troschel, 1848 -- valid -- tracaja, Yellow-spotted River Turtle, Yellow-spotted Sideneck Turtle
  Podocnemis vogli Müller, 1935 -- valid -- Llanos Sideneck Turtle, Savanna Side-necked Turtle, Savanna Sideneck Turtle
  Polychrotidae -- valid -- Anoloid Lizards
  Polychrus Cuvier, 1817 -- valid
  Polychrus marmoratus (Linnaeus, 1758) -- valid -- Many-colored Bush Anole
  Porthidium Cope, 1871 -- valid
  Porthidium dunni (Hartweg and Oliver, 1938) -- valid -- Dunn's Hognose Viper, Nauyaca-nariz de cerdo oxaqueña
  Porthidium hespere (Campbell, 1976) -- valid -- Nauyaca-nariz de cerdo de Tecomán, Western Hognose Viper
  Porthidium melanurum (Müller, 1924) -- invalid -- Nauyaca-nariz de cerdo cornuda
  Porthidium nasutum (Bocourt, 1868) -- valid -- Hognosed Pit Viper, Nauyaca-nariz de cerdo narigona
  Porthidium yucatanicum (H. M. Smith, 1941) -- valid -- Nauyaca-nariz de cerdo yucateca
  Proatheris Broadley, 1996 -- valid
  Proteidae Gray, 1825 -- invalid -- Mudpuppies, Olms, Waterdogs
  Protobothrops Hoge and Romano-Hoge, 1983 -- valid
  Psammobates Fitzinger, 1835 -- valid -- South African Star Tortoises
  Psammobates geometricus (Linnaeus, 1758) -- valid -- Geometric Tortoise, Geometric Turtle
  Psammobates oculiferus (Kuhl, 1820) -- invalid -- Serrated Tortoise
  Psammobates tentorius (Bell, 1828) -- valid -- Tent Tortoise
  Pseudacris Fitzinger, 1843 -- valid -- Chorus Frogs, Spring Peepers
  Pseudacris brachyphona (Cope, 1889) -- valid -- Mountain Chorus Frog
  Pseudacris brimleyi Brandt and Walker, 1933 -- valid -- Brimley's Chorus Frog
  Pseudacris cadaverina (Cope, 1866) -- valid -- California Chorus Frog, California Treefrog, Rana-de coro californiana
  Pseudacris clarkii (Baird, 1854) -- valid -- Spotted Chorus Frog
  Pseudacris crucifer (Wied-Neuwied, 1838) -- valid -- rainette crucifère, Spring Peeper
  Pseudacris crucifer bartramiana (Harper, 1939) -- invalid -- Southern Spring Peeper
  Pseudacris crucifer crucifer (Wied-Neuwied, 1838) -- invalid -- Northern Spring Peeper
  Pseudacris feriarum (Baird, 1854) -- valid -- Southeastern Chorus Frog, Upland Chorus Frog
  Pseudacris feriarum feriarum (Baird, 1854) -- invalid -- Upland Chorus Frog
  Pseudacris feriarum kalmi Harper, 1955 -- invalid -- New Jersey Chorus Frog
  Pseudacris maculata (Agassiz, 1850) -- valid -- Boreal Chorus Frog, rainette faux-grillon boréale
  Pseudacris nigrita (LeConte, 1825) -- valid -- Southern Chorus Frog
  Pseudacris nigrita feriarum (Baird, 1854) -- invalid
  Pseudacris ocularis (Bosc and Daudin in Sonnini de Manoncourt and Latreille, 1801) -- invalid -- Little Grass Frog
  Pseudacris ornata (Holbrook, 1836) -- valid -- Ornate Chorus Frog
  Pseudacris regilla (Baird and Girard, 1852) -- valid -- Northern Pacific Treefrog, Pacific Chorus Frog, Pacific Treefrog, Rana-de coro del pacífico
  Pseudacris streckeri Wright and Wright, 1933 -- valid -- Strecker's Chorus Frog
  Pseudacris triseriata (Wied-Neuwied, 1838) -- valid -- rainette faux-grillon de l'ouest, Striped Chorus Frog, Western Chorus Frog
  Pseudacris triseriata feriarum (Baird, 1854) -- invalid
  Pseudacris triseriata kalmi Harper, 1955 -- invalid
  Pseudemydura Siebenrock, 1901 -- valid -- Western Swamp Turtles
  Pseudemydura umbrina Siebenrock, 1901 -- valid -- Western Swamp Turtle
  Pseudemys Gray, 1856 -- valid -- cooter turtles, Cooters, red-bellied turtles
  Pseudemys alabamensis Baur, 1893 -- valid -- Alabama Red-bellied Cooter, Alabama red-bellied turtle
  Pseudemys concinna (Le Conte, 1830) -- valid -- River Cooter
  Pseudemys concinna concinna (Le Conte, 1830) -- valid -- Eastern River Cooter
  Pseudemys concinna floridana (Le Conte, 1830) -- valid -- Coastal Plain Cooter, common cooter, Florida cooter
  Pseudemys concinna gorzugi Ward, 1984 -- invalid -- Rio Grande Cooter, Rio Grande River Cooter
  Pseudemys concinna hieroglyphica (Holbrook, 1836) -- invalid -- Hieroglyphic River Cooter
  Pseudemys concinna metteri Ward, 1984 -- invalid -- Metter's Cooter, Missouri River Cooter
  Pseudemys concinna suwanniensis Carr, 1937 -- valid -- Suwannee cooter, Suwannee River cooter
  Pseudemys floridana (Le Conte, 1830) -- invalid -- Common Cooter
  Pseudemys floridana concinna (Le Conte, 1830) -- invalid
  Pseudemys floridana floridana (Le Conte, 1830) -- invalid -- Florida Cooter
  Pseudemys floridana hieroglyphica (Holbrook, 1836) -- invalid
  Pseudemys floridana peninsularis Carr, 1938 -- invalid -- Peninsula Cooter
  Pseudemys floridana suwanniensis Carr, 1937 -- invalid
  Pseudemys floridana texana Baur, 1893 -- invalid
  Pseudemys gorzugi Ward, 1984 -- valid -- Rio Grande Cooter, Tortuga del Río Bravo
  Pseudemys nelsoni Carr, 1938 -- valid -- Florida Red-bellied Cooter
  Pseudemys peninsularis Carr, 1938 -- valid -- Peninsula Cooter, Peninsular Cooter
  Pseudemys rubriventris (Le Conte, 1830) -- valid -- American red-bellied turtle, Northern Red-bellied Cooter, red-bellied turtle
  Pseudemys rubriventris bangsi Babcock, 1937 -- invalid -- Plymouth Red-bellied Turtle
  Pseudemys rubriventris rubriventris (Le Conte, 1830) -- invalid -- Red-bellied Turtle
  Pseudemys scripta elegans (Wied-Neuwied, 1839) -- invalid
  Pseudemys scripta scripta (Thunberg in Schoepff, 1792) -- invalid
  Pseudemys scripta troostii (Holbrook, 1836) -- invalid
  Pseudemys texana Baur, 1893 -- valid -- Texas Cooter
  Pseudobranchus Gray, 1825 -- valid -- Dwarf Sirens
  Pseudobranchus axanthus Netting and Goin, 1942 -- valid -- Narrow-striped Mud Siren, Southern Dwarf Siren
  Pseudobranchus striatus (LeConte, 1824) -- valid -- Dwarf Siren, Mud Siren, Northern Dwarf Siren
  Pseudobranchus striatus axanthus Netting and Goin, 1942 -- invalid -- Narrow-striped Mud Siren
  Pseudocerastes Boulenger, 1896 -- valid
  Pseudoficimia Bocourt, 1883 -- valid
  Pseudoficimia frontalis (Cope, 1864) -- valid -- Culebra ilamacoa, False Ficimia
  Pseudoleptodeira Taylor, 1939 -- valid
  Pseudoleptodeira latifasciata (Günther, 1894) -- valid -- Culebra-ojo de gato-falsa cabeza roja, False Cat-eyed Snake
  Pseudotriton Tschudi, 1838 -- valid -- Mud Salamanders, Red Salamanders
  Pseudotriton montanus Baird, 1850 -- valid -- Mud Salamander
  Pseudotriton ruber (Sonnini de Manoncourt and Latreille, 1801) -- valid -- Red Salamander
  Pseustes Fitzinger, 1843 -- invalid
  Pseustes poecilonotus (Günther, 1858) -- invalid -- Culebra resoplona norteña
  Pternohyla Boulenger, 1882 -- invalid -- Burrowing Treefrogs
  Pternohyla fodiens Boulenger, 1882 -- invalid -- Lowland Burrowing Treefrog, Rana-de árbol de tierras bajas
  Pyxidea Gray, 1863 -- invalid -- Keeled Box Turtles
  Pyxidea mouhotii (Gray, 1862) -- invalid -- keeled box turtle
  Pyxis Bell, 1827 -- valid -- Spider Tortoises
  Pyxis arachnoides Bell, 1827 -- valid -- Common Spider Tortoise, Spider Tortoise
  Pyxis planicauda (Grandidier, 1867) -- valid -- Flat-shelled Spider Tortoise, Flat-tailed Tortoise
  Rafetus Gray, 1864 -- valid -- Bicallosite Softshell Turtles
  Rafetus euphraticus (Daudin, 1801) -- valid -- Euphrates Softshell Turtle
  Rafetus swinhoei (Gray, 1873) -- valid -- Red River Giant Softshell Turtle, Shanghai Softshell Turtle, Swinhoe's Softshell Turtle, Yangtze Giant Softshell Turtle
  Ramphotyphlops Fitzinger, 1843 -- valid -- Long Tailed Blindsnakes, Long-tailed Blind Snakes
  Ramphotyphlops acuticaudus (Peters, 1877) -- valid -- Palau Blind Snake, Palau Blindsnake, Palau Island Blind Snake
  Ramphotyphlops braminus (Daudin, 1803) -- invalid -- Brahminy Blind Snake, Brahminy Blindsnake, Serpiente-ciega de Braminy
  Rana Linnaeus, 1758 -- valid -- Brown Frogs, True Frogs
  Rana areolata Baird and Girard, 1852 -- invalid -- Crawfish Frog
  Rana aurora Baird and Girard, 1852 -- valid -- Northern Red-legged Frog, Rana pata roja, Red-legged Frog
  Rana aurora aurora Baird and Girard, 1852 -- invalid -- Northern Red-legged Frog
  Rana aurora draytonii Baird and Girard, 1852 -- invalid -- California Red-legged Frog
  Rana berlandieri Baird, 1859 -- invalid -- Rana del Río Grande, Rio Grande Frog, Rio Grande Leopard Frog
  Rana blairi Mecham, Littlejohn, Oldham, Brown and Brown, 1973 -- invalid -- Plains Leopard Frog
  Rana boylii Baird, 1854 -- valid -- Foothill Yellow-legged Frog, Rana pata amarilla
  Rana brownorum Sanders, 1973 -- invalid
  Rana capito LeConte, 1855 -- invalid -- Gopher Frog
  Rana cascadae Slater, 1939 -- valid -- Cascades Frog
  Rana catesbeiana Shaw, 1802 -- invalid -- American Bullfrog, Bullfrog, ouaouaron, Rana toro
  Rana chiricahuensis Platz and Mecham, 1979 -- invalid -- Chiricahua Leopard Frog, Rana de chiricahua
  Rana clamitans Latreille in Sonnini de Manoncourt and Latreille, 1801 -- invalid -- Green Frog, grenouille verte
  Rana draytonii Baird and Girard, 1852 -- valid -- California Red-legged Frog
  Rana fisheri Stejneger, 1893 -- invalid -- Vegas Valley Leopard Frog
  Rana grylio Stejneger, 1901 -- invalid -- Pig Frog
  Rana halecina sphenocephala Cope, 1886 -- invalid
  Rana heckscheri Wright, 1924 -- invalid -- River Frog
  Rana luteiventris Thompson, 1913 -- valid -- Columbia Spotted Frog
  Rana magnaocularis Frost and Bagnara, 1974 -- invalid -- Rana del noroeste-mexicano
  Rana muscosa Camp, 1917 -- valid -- Mountain Yellow-legged Frog, Southern Mountain Yellow-legged Frog
  Rana nigromaculata Hallowell, 1861 -- invalid -- Black-spotted Frog
  Rana okaloosae Moler, 1985 -- invalid -- Florida Bog Frog
  Rana onca Cope in Yarrow, 1875 -- invalid -- Relict Leopard Frog
  Rana palustris LeConte, 1825 -- invalid -- grenouille des marais, Pickerel Frog
  Rana pipiens Schreber, 1782 -- invalid -- grenouille léopard, Northern Leopard Frog
  Rana pipiens sphenocephala Cope, 1886 -- invalid
  Rana pretiosa Baird and Girard, 1853 -- valid -- Oregon Spotted Frog
  Rana rugosa Temminck and Schlegel, 1838 -- invalid -- Wrinkled Frog
  Rana septentrionalis Baird, 1854 -- invalid -- grenouille du nord, Mink Frog
  Rana sphenocephala Cope, 1886 -- invalid -- Southern Leopard Frog
  Rana sphenocephala utricularia Harlan, 1826 -- invalid -- Southern Leopard Frog
  Rana subaquavocalis Platz, 1993 -- invalid -- Ramsey Canyon Leopard Frog
  Rana sylvatica LeConte, 1825 -- invalid -- grenouille des bois, Wood Frog
  Rana tarahumarae Boulenger, 1917 -- invalid -- Rana tarahumara, Tarahumara Frog
  Rana utricularia Harlan, 1826 -- invalid -- Southern Leopard Frog
  Rana utricularia sphenocephala Cope, 1886 -- invalid -- Florida Leopard Frog
  Rana utricularia utricularia Harlan, 1826 -- invalid -- Southern Leopard Frog
  Rana virgatipes Cope, 1891 -- invalid -- Carpenter Frog
  Rana yavapaiensis Platz and Frost, 1984 -- invalid -- Lowland Leopard Frog, Rana de Yavapai, Yavapai Frog, Yavapai Leopard Frog
  Ranidae Rafinesque, 1814 -- invalid -- Ranid Frogs, Ranids, Riparian Frogs, True Frogs
  Regina Baird and Girard, 1853 -- valid -- Crawfish Snakes, Crayfish Snakes
  Regina alleni (Garman, 1874) -- invalid -- Striped Crayfish Snake
  Regina grahamii Baird and Girard, 1853 -- valid -- Graham's Crawfish Snake, Graham's Crayfish Snake
  Regina rigida (Say, 1825) -- invalid
  Regina septemvittata (Say, 1825) -- valid -- Queen Snake, Queensnake
  Reptilia Laurenti, 1768 -- valid -- répteis, reptiles, Reptiles
  Rhadinaea Cope, 1863 -- valid -- Littersnakes, Woodland Snakes, Woodlands Snakes
  Rhadinaea bogertorum Myers, 1974 -- valid -- Culebra-café oaxaqueña, Oaxacan Graceful Brown Snake
  Rhadinaea cuneata Myers, 1974 -- valid -- Culebra-café veracruzana, Veracruz Graceful Brown Snake
  Rhadinaea decorata (Günther, 1858) -- valid -- Adorned Graceful Brown Snake, Culebra-café adornada
  Rhadinaea flavilata (Cope, 1871) -- valid -- Pine Woods Littersnake, Pine Woods Snake
  Rhadinaea forbesi H. M. Smith, 1942 -- valid -- Culebra-café de Forbes, Forbes' Graceful Brown Snake
  Rhadinaea fulvivittis Cope, 1875 -- valid -- Culebra-café listada, Ribbon Graceful Brown Snake
  Rhadinaea gaigeae Bailey, 1937 -- valid -- Culebra-café de Gaige, Gaige's Pine Forest Snake
  Rhadinaea godmani (Günther, 1865) -- invalid -- Culebra-café de Godman
  Rhadinaea hannsteini (Stuart, 1949) -- invalid -- Culebra-café labios manchados
  Rhadinaea hempsteadae Stuart and Bailey, 1941 -- invalid -- Culebra-café de Hempstead
  Rhadinaea hesperia Bailey, 1940 -- valid -- Culebra-café de Occidente, Western Graceful Brown Snake
  Rhadinaea lachrymans (Cope, 1870) -- invalid -- Culebra-café llorona
  Rhadinaea laureata (Günther, 1868) -- valid -- Crowned Graceful Brown Snake, Culebra-café coronada
  Rhadinaea macdougalli H. M. Smith and Langebartel, 1949 -- valid -- Culebra-café de MacDougall, MacDougall's Graceful Brown Snake
  Rhadinaea marcellae Taylor, 1949 -- valid -- Culebra-café de Marcella, Marcella's Graceful Brown Snake
  Rhadinaea montana H. M. Smith, 1944 -- valid -- Culebra-café de Nuevo León, Nuevo Leon Graceful Brown Snake
  Rhadinaea myersi Rossman, 1965 -- valid -- Culebra-café de Meyer, Myers' Graceful Brown Snake
  Rhadinaea omiltemana (Günther, 1894) -- valid -- Culebra-café guerrerense, Guerreran Pine Woods Snake
  Rhadinaea posadasi (Slevin, 1936) -- invalid -- Culebra-café de Posada
  Rhadinaea quinquelineata Cope, 1886 -- valid -- Culebra-café poblana, Pueblan Graceful Brown Snake
  Rhadinaea schistosa (H. M. Smith, 1941) -- invalid -- Culebra-café collar-incompleto
  Rhadinaea taeniata (Peters, 1863) -- valid -- Culebra-café de pino-encino, Pine-Oak Snake
  Rhadinophanes Myers and Campbell, 1981 -- valid
  Rhadinophanes monticola Myers and Campbell, 1981 -- valid -- Culebra de montaña, Graceful Mountain Snake
  Rhampholeon Günther, 1874 -- valid -- African Leaf Chameleons
  Rhampholeon acuminatus Mariaux and Tilbury, 2006 -- valid -- Nguru Pygmy Chameleon
  Rhampholeon beraduccii Mariaux and Tilbury, 2006 -- valid -- Beraducci's Pygmy Chameleon
  Rhampholeon boulengeri Steindachner, 1911 -- valid -- Boulenger's Pygmy Chameleon
  Rhampholeon brachyurus Günther, 1893 -- invalid
  Rhampholeon brevicaudatus (Matschie, 1892) -- invalid
  Rhampholeon chapmanorum Tilbury, 1992 -- valid -- Chapmans' Pygmy Chameleon
  Rhampholeon gorongosae Broadley, 1971 -- valid
  Rhampholeon kerstenii (W. C. H. Peters, 1868) -- invalid
  Rhampholeon marshalli Boulenger, 1906 -- valid -- Marshall's Stumptail Chameleon
  Rhampholeon moyeri Menegon, Salvidio and Tilbury, 2002 -- valid -- Moyer's Pygmy Chameleon
  Rhampholeon nchisiensis (Loveridge, 1953) -- valid -- South African Stumptail Chameleon
  Rhampholeon platyceps Günther, 1893 -- valid -- Malawi Stumptail Chameleon, Mount Mulanje Pygmy Chameleon
  Rhampholeon spectrum (Buchholz, 1874) -- valid -- Cameroon Stumptail Chameleon
  Rhampholeon spinosum (Matschie, 1892) -- invalid
  Rhampholeon spinosus (Matschie, 1892) -- valid -- Rosette-nosed Pygmy Chameleon
  Rhampholeon temporalis (Matschie, 1892) -- valid -- Usambara Stumptail Chameleon
  Rhampholeon uluguruensis Tilbury and Emmrich, 1996 -- valid -- Uluguru Pygmy Chameleon
  Rhampholeon viridis Mariaux and Tilbury, 2006 -- valid -- Green Pygmy Chameleon
  Rheodytes Legler and Cann, 1980 -- valid -- Fitzroy River Turtles
  Rheodytes leukops Legler and Cann, 1980 -- valid -- Fitzroy River Turtle
  Rhineura Cope, 1861 -- valid -- North American Worm Lizards
  Rhineura floridana (Baird, 1858) -- valid -- Florida Worm Lizard
  Rhineuridae Vanzolini, 1951 -- valid -- North American Worm Lizards
  Rhinocheilus Baird and Girard, 1853 -- valid -- Long-nosed Snakes
  Rhinocheilus lecontei Baird and Girard, 1853 -- valid -- Culebra narigona, Long-nosed Snake, Longnose Snake, Western Long-nosed Snake
  Rhinoclemmys Fitzinger, 1835 -- valid -- Neotropical Wood Turtles
  Rhinoclemmys annulata (Gray, 1860) -- valid -- Brown Wood Turtle
  Rhinoclemmys areolata (Duméril and Bibron in Duméril and Duméril, 1851) -- valid -- Furrowed Wood Turtle, Tortuga-de monte mojina
  Rhinoclemmys diademata (Mertens, 1954) -- valid -- Maracaibo Wood Turtle
  Rhinoclemmys funerea (Cope, 1876) -- valid -- Black Wood Turtle
  Rhinoclemmys melanosterna (Gray, 1861) -- valid -- Colombian Wood Turtle
  Rhinoclemmys nasuta (Boulenger, 1902) -- valid -- Large-nosed Wood Turtle
  Rhinoclemmys pulcherrima (Gray, 1856) -- valid -- Painted Wood Turtle, Tortuga-de monte pintada
  Rhinoclemmys punctularia (Daudin, 1801) -- valid -- Spot-legged Turtle
  Rhinoclemmys rubida (Cope, 1870) -- valid -- Mexican Spotted Wood Turtle, Tortuga-de monte payaso
  Rhinophrynidae Günther, 1859 -- valid -- Burrowing Toads
  Rhinophrynus Duméril and Bibron, 1841 -- valid -- Burrowing Toads
  Rhinophrynus dorsalis Duméril and Bibron, 1841 -- valid -- Burrowing Toad, Mexican Burrowing Toad, Sapo-excavador mexicano
  Rhyacosiredon Dunn, 1928 -- invalid
  Rhyacosiredon altamirani (Dugès, 1895) -- invalid -- Siredón del Ajusco
  Rhyacosiredon leorae Taylor, 1943 -- invalid
  Rhyacosiredon rivularis Taylor, 1940 -- invalid -- Siredón de Toluca
  Rhyacosiredon zempoalaensis Taylor and Smith, 1945 -- invalid
  Rhyacotriton Dunn, 1920 -- valid -- Olympic Salamanders, Olympic Torrent Salamanders, Torrent Salamanders
  Rhyacotriton cascadae Good and Wake, 1992 -- valid -- Cascade Torrent Salamander
  Rhyacotriton kezeri Good and Wake, 1992 -- valid -- Columbia Torrent Salamander
  Rhyacotriton olympicus (Gaige, 1917) -- valid -- Olympic Salamander, Olympic Torrent Salamander
  Rhyacotriton variegatus Stebbins and Lowe, 1951 -- valid -- Southern Torrent Salamander
  Rhyacotritonidae Tihen, 1958 -- valid -- Torrent Salamanders
  Rhynchocephalia -- valid -- Tuataras
  Rieppeleon Matthee, Tilbury and Townsend, 2004 -- valid -- African Leaf Chameleons
  Rieppeleon brachyurus (Günther, 1893) -- valid
  Rieppeleon brevicaudatus (Matschie, 1892) -- valid -- Bearded Pygmy Chameleon
  Rieppeleon kerstenii (W. C. H. Peters, 1868) -- valid -- Kenya Stumptail Chameleon
  Sacalia Gray, 1870 -- valid -- Eyed Turtles
  Sacalia bealei (Gray, 1831) -- valid -- Beal's Eyed Turtle
  Sacalia quadriocellata (Siebenrock, 1903) -- valid -- Four-eyed Turtle
  Salamandra guttolineata Holbrook, 1838 -- invalid
  Salamandridae Goldfuss, 1820 -- valid -- Newts, Salamanders
  Salientia -- invalid
  Salvadora Baird and Girard, 1853 -- valid -- Patch-nosed Snakes
  Salvadora bairdi Jan, 1860 -- valid -- Baird's Patchnose Snake, Culebra-parchada de Baird
  Salvadora deserticola Schmidt, 1940 -- valid -- Big Bend Patch-nosed Snake, Big Bend Patchnose Snake, Culebra-parchada de Big Bend
  Salvadora grahamiae Baird and Girard, 1853 -- valid -- Culebra-parchada de montaña, Eastern Patch-nosed Snake, Mountain Patch-nosed Snake, Mountain Patchnose Snake
  Salvadora hexalepis (Cope, 1867) -- valid -- Culebra-parchada de cabestrillo, Western Patch-nosed Snake, Western Patchnose Snake
  Salvadora intermedia Hartweg, 1940 -- valid -- Culebra-parchada oaxaqueña, Oaxacan Patchnose Snake
  Salvadora lemniscata (Cope, 1895) -- valid -- Culebra-parchada del Pacífico, Pacific Patchnose Snake
  Salvadora mexicana (A. M. C. Duméril, Bibron and A. H. A. Duméril, 1854) -- valid -- Culebra-parchada mexicana, Mexican Patchnose Snake
  Sauria -- invalid
  Sauromalus A. H. A. Duméril, 1856 -- valid -- Chuckwallas
  Sauromalus australis Shaw, 1945 -- invalid -- Chuckwalla peninsular
  Sauromalus hispidus Stejneger, 1891 -- valid -- Chuckwalla espinosa, Spiny Chuckwalla
  Sauromalus obesus (Baird, 1859) -- invalid -- Chuckwalla, Chuckwalla común
  Sauromalus obesus obesus (Baird, 1859) -- invalid -- Western Chuckwalla
  Sauromalus obesus tumidus Shaw, 1945 -- invalid -- Arizona Chuckwalla, Gila Chuckwalla
  Sauromalus slevini Van Denburgh, 1922 -- valid -- Chuckwalla de Monserrat, Monserrat Chuckwalla, Slevin's Chuckwalla
  Sauromalus varius Dickerson, 1919 -- valid -- Chuckwalla de San Esteban, Piebald Chuckwalla
  Scaphiodontophis Taylor and H. M. Smith, 1943 -- valid
  Scaphiodontophis annulatus (A. M. C. Duméril, Bibron and A. H. A. Duméril, 1854) -- valid -- Culebra-añadida guatemalteca, Guatemala Neckband Snake
  Scaphiopus Holbrook, 1836 -- valid -- North American Spadefoots
  Scaphiopus couchii Baird, 1854 -- valid -- Couch's Spadefoot
  Scaphiopus holbrookii (Harlan, 1835) -- valid -- Eastern Spadefoot
  Scaphiopus holbrookii holbrookii (Harlan, 1835) -- invalid -- Eastern Spadefoot
  Scaphiopus holbrookii hurterii Strecker, 1910 -- invalid -- Hurter's Spadefoot
  Scaphiopus hurterii Strecker, 1910 -- valid -- Hurter's Spadefoot
  Scaptochelys agassizii (Cooper, 1861) -- invalid
  Sceloporus Wiegmann, 1828 -- valid -- Spiny Lizards
  Sceloporus acanthinus Bocourt, 1873 -- valid -- Bocourt's Spiny Lizard, Lagartija-escamosa de Boucourt
  Sceloporus adleri H. M. Smith and Savitzky, 1974 -- valid -- Adler's Spiny Lizard, Lagartija-escamosa de Adler
  Sceloporus aeneus Wiegmann, 1828 -- valid -- Lagartija-escamosa llanera, Southern Bunchgrass Lizard
  Sceloporus anahuacus Lara-Góngora, 1983 -- valid -- Anahuacan Bunchgrass Lizard, Lagartija-escamosa de Anáhuac
  Sceloporus angustus (Dickerson, 1919) -- valid -- Lagartija-escamosa angosta, Santa Cruz Island Sator
  Sceloporus arenicolus Degenhardt and Jones, 1972 -- valid -- Dunes Sagebrush Lizard
  Sceloporus asper Boulenger, 1897 -- valid -- Asperous Spiny Lizard, Lagartija-escamosa de Boulenger
  Sceloporus bicanthalis H. M. Smith, 1937 -- valid -- Lagartija-escamosa transvolcánica, Trans Volcanic Bunchgrass Lizard
  Sceloporus bulleri Boulenger, 1894 -- valid -- Buller's Spiny Lizard, Lagartija-escamosa de Buller
  Sceloporus carinatus H. M. Smith, 1936 -- valid -- Keeled Spiny Lizard, Lagartija-escamosa aquillada
  Sceloporus cautus H. M. Smith, 1938 -- valid -- Lagartija-escamosa tímida, Shy Spiny Lizard
  Sceloporus chaneyi Liner and Dixon, 1992 -- valid -- Chaney's Spiny Lizard, Peña Nevada Agave Lizard
  Sceloporus chrysostictus Cope, 1866 -- valid -- Lagartija-escamosa pintas amarillas, Yellow-spotted Spiny Lizard
  Sceloporus clarkii Baird and Girard, 1852 -- valid -- Clark's Spiny Lizard
  Sceloporus clarkii clarkii Baird and Girard, 1852 -- valid -- Sonoran Spiny Lizard
  Sceloporus clarkii vallaris Shannon and Urbano, 1954 -- valid -- Plateau Spiny Lizard
  Sceloporus couchii Baird, 1859 -- valid -- Couch's Spiny Lizard
  Sceloporus cozumelae Jones, 1927 -- valid -- Cozumel Spiny Lizard, Lagartija-escamosa de Cozumel
  Sceloporus cryptus H. M. Smith and Lynch, 1967 -- valid -- Lagartija-escamosa de Sierra de Juárez, Sierra Juarez Spiny Lizard
  Sceloporus dugesii Bocourt, 1874 -- valid -- Duges' Spiny Lizard
  Sceloporus edwardtaylori H. M. Smith, 1936 -- valid -- Lagartija-escamosa de Taylor, Taylor's Spiny Lizard
  Sceloporus exsul Dixon, Ketchersid and Lieb, 1972 -- valid -- Lagartija-escamosa de Querétaro, Queretaran Desert Lizard
  Sceloporus formosus Wiegmann, 1834 -- valid -- Lagartija-escamosa esmeralda-norteña, Mexican Emerald Spiny Lizard
  Sceloporus gadoviae Boulenger, 1905 -- valid -- Gadow's Spiny Lizard, Lagartija-escamosa de Gadow
  Sceloporus goldmani H. M. Smith, 1937 -- valid -- Goldman's Bunchgrass Lizard, Lagartija-escamosa de Goldman
  Sceloporus graciosus Baird and Girard, 1852 -- valid -- Lagartija-escamosa de Artemisa, Sagebrush Lizard
  Sceloporus graciosus arenicolous Degenhardt and Jones, 1972 -- invalid -- Dunes Sagebrush Lizard
  Sceloporus grammicus Wiegmann, 1828 -- valid -- Graphic Spiny Lizard, Lagartija-escamosa de mezquite, Mesquite Lizard
  Sceloporus grammicus microlepidotus Wiegmann, 1834 -- valid -- Northern Mesquite Lizard, Northern Plateau Graphic Lizard
  Sceloporus grandaevus (Dickerson, 1919) -- valid -- Cerralvo Island Sator, Lagartija-escamosa anciana
  Sceloporus heterolepis Boulenger, 1894 -- valid -- Dorsalkeel Spiny Lizard, Lagartija-escamosa dorso aquillado, Southern Odd-scaled Lizard
  Sceloporus horridus Wiegmann, 1834 -- valid -- Horrible Spiny Lizard, Lagartija-escamosa tarasca, Rough Lizard
  Sceloporus hunsakeri Hall and H. M. Smith, 1979 -- valid -- Hunsaker's Spiny Lizard, Lagartija-escamosa de Hunsaker
  Sceloporus insignis Webb, 1967 -- valid -- Coalcoman Black-collared Lizard, Lagartija-escamosa collar negro, Michoacán Blackcollar Lizard
  Sceloporus internasalis H. M. Smith and Bumzahem, 1955 -- valid -- Lagartija-escamosa verde, Mail-snouted Spiny Lizard
  Sceloporus jalapae Günther, 1890 -- valid -- Jalapa Spiny Lizard, Lagartija-escamosa jalapeña
  Sceloporus jarrovii Cope in Yarrow, 1875 -- valid -- Mountain Spiny Lizard, Yarrow's Spiny Lizard
  Sceloporus licki Van Denburgh, 1895 -- valid -- Cape Arboreal Spiny Lizard, Lagartija-escamosa del Cabo
  Sceloporus lineatulus Dickerson, 1919 -- valid -- Lagartija-escamosa de Santa Catalina, Santa Catalina Spiny Lizard
  Sceloporus lundelli H. M. Smith, 1939 -- valid -- Lagartija-escamosa de Lundell, Lundell's Spiny Lizard
  Sceloporus macdougalli H. M. Smith and Bumzahem, 1953 -- valid -- Lagartija-escamosa de MacDougall, MacDougall's Spiny Lizard
  Sceloporus maculosus H. M. Smith, 1934 -- valid -- Lagartija-escamosa maculada, Northern Snub-nosed Lizard, Spotted Spiny Lizard
  Sceloporus magister Hallowell, 1854 -- valid -- Desert Spiny Lizard, Lagartija-escamosa de desierto
  Sceloporus megalepidurus H. M. Smith, 1934 -- valid -- Cursorial Spiny Lizard, Dull Cursorial Spiny Lizard, Lagartija-escamosa escamas grandes, Largescale Spiny Lizard
  Sceloporus melanorhinus Bocourt, 1876 -- valid -- Black-nosed Lizard, Lagartija-escamosa hocico negro, Pastel Tree Lizard
  Sceloporus merriami Stejneger, 1904 -- valid -- Canyon Lizard, Lagartija-escamosa de cañón
  Sceloporus mucronatus Cope, 1885 -- valid -- Cleft Lizard, Lagartija-escamosa de grieta-sureña
  Sceloporus nelsoni Cochran, 1923 -- valid -- Lagartija-escamosa de Nelson, Nelson's Spiny Lizard
  Sceloporus occidentalis Baird and Girard, 1852 -- valid -- Lagartija-escamosa del occidente, Western Fence Lizard
  Sceloporus ochoterenae H. M. Smith, 1934 -- valid -- Lagartija-escamosa de Querétaro, Ochoterena's Lizard, Queretaran Spiny Lizard
  Sceloporus olivaceus H. M. Smith, 1934 -- valid -- Lagartija-escamosa de Texas, Texas Spiny Lizard
  Sceloporus orcutti Stejneger, 1893 -- valid -- Granite Spiny Lizard, Lagartija-escamosa de granito
  Sceloporus ornatus Baird, 1859 -- valid -- Lagartija-escamosa adornada, Ornate Spiny Lizard
  Sceloporus palaciosi Lara-Góngora, 1983 -- valid -- Lagartija-escamosa de Palacios, Palacios' Bunchgrass Lizard
  Sceloporus parvus H. M. Smith, 1934 -- valid -- Bluebelly Lizard, Lagartija-escamosa panza azul
  Sceloporus poinsettii Baird and Girard, 1852 -- valid -- Crevice Spiny Lizard
  Sceloporus pyrocephalus Cope, 1864 -- valid -- Boulder Spiny Lizard, Lagartija-escamosa de pedregal, Red-headed Spiny Lizard
  Sceloporus rufidorsum Yarrow, 1882 -- invalid -- Lagartija-escamosa de desierto-mexicano
  Sceloporus salvini Günther, 1890 -- valid -- Lagartija-escamosa de Salvin, Salvin's Spiny Lizard
  Sceloporus scalaris Wiegmann, 1828 -- valid -- Bunch Grass Lizard, Lagartija-escamosa escalonada, Light-bellied Bunch Grass Lizard
  Sceloporus scalaris scalaris Wiegmann, 1828 -- valid -- Bunch Grass Lizard
  Sceloporus scalaris slevini H. M. Smith, 1937 -- invalid
  Sceloporus serrifer Cope, 1866 -- valid -- Blue Spiny Lizard, Lagartija-escamosa azul, Rough-scaled Lizard
  Sceloporus siniferus Cope, 1871 -- valid -- Lagartija-escamosa cola larga, Longtail Spiny Lizard
  Sceloporus smaragdinus Bocourt, 1873 -- valid -- Bocourt's Emerald Lizard, Lagartija-escamosa esmeralda-de Bocourt
  Sceloporus spinosus Wiegmann, 1828 -- valid -- Eastern Spiny Lizard, Lagartija-escamosa espinosa
  Sceloporus squamosus Bocourt, 1874 -- valid -- Lagartija-escamosa de Bocourt, Mexican Spiny Lizard
  Sceloporus stejnegeri H. M. Smith, 1942 -- valid -- Lagartija-escamosa collar negro, Stejneger's Blackcollar Spiny Lizard
  Sceloporus subpictus Lynch and H. M. Smith, 1965 -- valid -- Lagartija-escamosa pintada, Southern Cursorial Lizard
  Sceloporus taeniocnemis Cope, 1885 -- valid -- Guatemalan Emerald Spiny Lizard, Lagartija-escamosa esmeralda-de Cope
  Sceloporus tanneri H. M. Smith and Larsen, 1975 -- valid -- Lagartija-escamosa de Tanner, Tanner's Spiny Lizard
  Sceloporus torquatus Wiegmann, 1828 -- valid -- Crevice Swift, Lagartija-escamosa barrada, Torquate Lizard
  Sceloporus undulatus (Bosc and Daudin in Sonnini and Latreille, 1801) -- valid -- Eastern Fence Lizard, Fence Lizard, Lagartija-escamosa de pradera, Plateau Lizard, Prairie Lizard
  Sceloporus utiformis Cope, 1864 -- valid -- Antesator, Cope's Largescale Spiny Lizard, Lagartija-escamosa de suelo
  Sceloporus variabilis Wiegmann, 1834 -- valid -- Lagartija-escamosa panza rosada, Rose-bellied Lizard, Rosebelly Lizard
  Sceloporus virgatus H. M. Smith, 1938 -- valid -- Lagartija-escamosa rayada, Striped Plateau Lizard
  Sceloporus woodi Stejneger, 1918 -- valid -- Florida Scrub Lizard
  Sceloporus zosteromus Cope, 1863 -- valid -- Central Baja Spiny Lizard, Lagartija-escamosa de San Lucas
  Scinax staufferi (Cope, 1865) -- valid -- Rana-de árbol de Stauffer
  Scincella Mittleman, 1950 -- valid -- ground skinks
  Scincella gemmingeri (Cope, 1864) -- valid -- Encinela de selva, Forest Ground Skink
  Scincella lateralis (Say in James, 1822) -- valid -- Encinela norteña, Ground Skink, Little Brown Skink
  Scincella silvicola (Taylor, 1937) -- valid -- Encinela de Taylor
  Scincidae Oppel, 1811 -- valid -- Skinks
  Scincus laterale Say in James, 1822 -- invalid
  Scincus laticeps Schneider, 1801 -- invalid
  Scincus sloanii Daudin, 1803 -- invalid
  Seminatrix Cope, 1895 -- invalid -- Swamp Snakes, Swampsnakes
  Seminatrix pygaea (Cope, 1871) -- invalid -- Black Swamp Snake, Black Swampsnake
  Senticolis Dowling and Fries, 1987 -- valid -- Green Ratsnakes, Mountain Rat Snakes
  Senticolis triaspis (Cope, 1866) -- valid -- Culebra oliva, Green Rat Snake, Green Ratsnake
  Serpentes Linnaeus, 1758 -- valid -- cobra, serpente, serpents, Snakes
  Shinisaurus Ahl, 1930 -- valid
  Sibon annuliferus (Boulenger, 1894) -- invalid
  Sibon dimidiatus (Günther, 1872) -- valid -- Slender Snail Sucker
  Sibon fasciatus (Günther, 1858) -- invalid
  Sibon fischeri (Boulenger, 1894) -- invalid -- Culebra-caracolera de Fisher
  Sibon nebulatus (Linnaeus, 1758) -- valid -- Cloudy Snail Sucker, Cloudy Snail-eating Snake, Slug-eating Snake
  Sibon nebulatus nebulatus (Linnaeus, 1758) -- invalid
  Sibon philippii (Jan, 1863) -- invalid
  Sibon sartorii (Cope, 1863) -- invalid -- Culebra-caracolera terrestre
  Sibon zweifeli (Liner and Wilson, 1970) -- invalid -- Culebra-caracolera de Zweifel
  Siebenrockiella Lindholm, 1929 -- valid -- Black Marsh Turtles
  Siebenrockiella crassicollis (Gray, 1830) -- valid -- Black Marsh Turtle
  Siren Linnaeus, 1767 -- invalid -- Sirens
  Siren intermedia Barnes, 1826 -- valid -- Lesser Siren, Sirena menor
  Siren lacertina Linnaeus, 1767 -- invalid -- Greater Siren, Sirena mayor
  Sirenidae Gray, 1825 -- valid -- Sirens
  Sistrurus Garman, 1884 -- valid -- Massasaugas, Pigmy Rattlesnakes, Pygmy Rattlesnakes
  Sistrurus catenatus (Rafinesque-Schmaltz, 1818) -- valid -- Eastern Massasauga, Massasauga, Víbora-cascabel pigmea-norteña
  Sistrurus miliarius (Linnaeus, 1766) -- valid -- Pigmy Rattlesnake, Pygmy Rattlesnake
  Sistrurus ravus (Cope, 1865) -- invalid -- Víbora-cascabel pigmea-mexicana
  Smilisca Cope, 1865 -- valid -- Mexican treefrogs, Smiliscas
  Smilisca baudinii (Duméril and Bibron, 1841) -- valid -- Mexican Smilisca, Mexican Treefrog
  Sonora Baird and Girard, 1853 -- valid -- North American Ground Snakes, North American Groundsnakes
  Sonora aemula (Cope, 1879) -- valid -- Culebra-suelera cola plana, Filetail Ground Snake
  Sonora michoacanensis (Dugès, 1884) -- valid -- Culebra-suelera michoacana, Michoacán Ground Snake
  Sonora semiannulata Baird and Girard, 1853 -- valid -- Culebra-suelera semianillada, Ground Snake, Groundsnake, Western Groundsnake
  Spea Cope, 1866 -- valid -- Western Spadefoots
  Spea bombifrons (Cope, 1863) -- valid -- Plains Spadefoot, Sapo-de espuelas de las planicies
  Spea hammondii (Baird, 1859) -- valid -- Western Spadefoot
  Spea intermontana (Cope, 1883) -- valid -- Great Basin Spadefoot
  Spea multiplicata (Cope, 1863) -- valid -- Mexican Spadefoot
  Sphaenorhynchus orophilus (Lutz and Lutz, 1938) -- invalid
  Sphaenorhynchus planicola (Lutz and Lutz, 1938) -- valid
  Sphaenorhynchus seabrai (Bokermann, 1958) -- invalid
  Sphaerodactylus Wagler, 1830 -- valid -- Dwarf Geckos
  Sphaerodactylus argus Gosse, 1850 -- valid -- Geco-enano ocelado, Ocellated Dwarf Gecko, Ocellated Gecko, Ocellated Gekko
  Sphaerodactylus beattyi Grant, 1937 -- valid -- Cotton Ginner Gecko
  Sphaerodactylus becki Schmidt, 1919 -- valid -- Navassa Dwarf Gecko, Navassa Island Dwarf Gecko
  Sphaerodactylus elegans Macleay, 1834 -- valid -- Ashy Gecko
  Sphaerodactylus gaigeae Grant, 1932 -- valid -- Gaige's Dwarf Gecko, Pandura's Gecko
  Sphaerodactylus glaucus Cope, 1865 -- valid -- Geco-enano collarejo
  Sphaerodactylus klauberi Grant, 1931 -- valid -- Klauber's Dwarf Gecko
  Sphaerodactylus levinsi Heatwole, 1968 -- valid -- Desecheo Dwarf Gecko
  Sphaerodactylus macrolepis Günther, 1859 -- valid -- Common Dwarf Gecko
  Sphaerodactylus micropithecus Schwartz, 1977 -- valid -- Monito Dwarf Gecko, Monito Gecko
  Sphaerodactylus millepunctatus Hallowell, 1861 -- valid -- Geco-enano punteado
  Sphaerodactylus monensis Meerwarth, 1901 -- valid -- Mona Dwarf Gecko
  Sphaerodactylus nicholsi Grant, 1931 -- valid -- Nichols' Dwarf Gecko
  Sphaerodactylus notatus Baird, 1859 -- valid -- Reef Gecko
  Sphaerodactylus roosevelti Grant, 1931 -- valid -- Roosevelt's Dwarf Gecko
  Sphaerodactylus townsendi Grant, 1931 -- valid -- Townsend's Dwarf Gecko
  Sphargis coriacea schlegelii Garman, 1884 -- invalid
  Sphenodon Gray, 1831 -- valid -- Tuataras
  Sphenodon guntheri Buller, 1877 -- invalid
  Sphenodon punctatus (Gray, 1842) -- valid -- Tuatara
  Sphenodontidae Cope, 1870 -- valid -- Tuataras
  Sphenomorphus Fitzinger, 1843 -- valid -- Common Skinks
  Sphenomorphus assatum (Cope, 1864) -- invalid
  Sphenomorphus cherriei (Cope, 1893) -- invalid -- Encinela-selvática café
  Sphenomorphus incertum (Stuart, 1940) -- invalid -- Encinela-selvática hojarasquera
  Sphenomorphus scutatus (Peters, 1867) -- valid -- Palauan Skink
  Spilotes pullatus pullatus (Linnaeus, 1758) -- invalid -- Tiger Snake, Tropical Rat Snake
  Squamata Oppel, 1811 -- valid -- Amphisbaenians, amphisbènes, lézards, Lizards, serpents, Snakes
  Staurotypidae Gray, 1869 -- invalid
  Staurotypinae Gray, 1869 -- valid
  Staurotypus Wagler, 1830 -- valid -- Giant Musk Turtles
  Staurotypus salvinii Gray, 1864 -- valid -- Pacific Coast Giant Musk Turtle
  Staurotypus triporcatus (Wiegmann, 1828) -- valid -- Mexican Giant Musk Turtle, Northern Giant Musk Turtle, Tortuga-almizclera tres lomos
  Stellio undulatus Bosc and Daudin in Sonnini and Latreille, 1801 -- invalid
  Stenodactylus variegatus Baird, 1859 -- invalid
  Stenorrhina A. M. C. Duméril, 1853 -- valid
  Stenorrhina degenhardtii (Berthold, 1846) -- valid -- Degenhardt's Scorpion-eating Snake
  Stenorrhina freminvillei A. M. C. Duméril, Bibron and A. H. A. Duméril, 1854 -- valid -- Blood Snake, Culebra-alacranera de sangre, Slaty Grey Snake
  Stereochilus Cope, 1869 -- valid -- Many-lined Salamanders
  Stereochilus marginatus (Hallowell, 1856) -- valid -- Many-lined Salamander
  Sternotherus Bell in Gray, 1825 -- valid -- Musk Turtles
  Sternotherus carinatus (Gray, 1856) -- valid -- Razor-backed Musk Turtle
  Sternotherus carinatus carinatus (Gray, 1856) -- invalid
  Sternotherus carinatus minor (Agassiz, 1857) -- invalid
  Sternotherus carinatus peltifer Smith and Glass, 1947 -- invalid
  Sternotherus depressus Tinkle and Webb, 1955 -- valid -- Flattened Musk Turtle
  Sternotherus minor (Agassiz, 1857) -- valid -- Loggerhead Musk Turtle
  Sternotherus minor minor (Agassiz, 1857) -- valid -- Eastern Loggerhead Musk Turtle, Loggerhead Musk Turtle
  Sternotherus minor peltifer Smith and Glass, 1947 -- valid -- Stripe-necked Musk Turtle, stripeneck musk turtle
  Sternotherus odoratus (Latreille in Sonnini and Latreille, 1801) -- valid -- Common Musk Turtle, Eastern Musk Turtle, Musk Turtle, Stinkpot
  Sternotherus peltifer Smith and Glass, 1947 -- invalid
  Stilosoma Brown, 1890 -- invalid -- Short-tailed Snakes
  Stilosoma extenuatum Brown, 1890 -- invalid -- Short-tailed Snake
  Storeria Baird and Girard, 1853 -- valid -- Brown-bellied Snakes, North American Brownsnakes, Red-bellied Snakes
  Storeria dekayi (Holbrook, 1839) -- valid -- Brown Snake, couleuvre brune, Culebra-parda de Kay, Dekay's Brown Snake, Dekay's Brownsnake, Northern Brown Snake
  Storeria hidalgoensis Taylor, 1942 -- valid -- Culebra-parda hidalguense, Mexican Yellowbelly Brown Snake
  Storeria occipitomaculata (Storer, 1839) -- valid -- couleuvre à ventre rouge, Red-bellied Snake, Redbelly Snake
  Storeria storerioides (Cope, 1865) -- valid -- Culebra-parda mexicana, Mexican Brown Snake
  Symphimus Cope, 1870 -- valid
  Symphimus leucostomus Cope, 1870 -- valid -- Culebra-labios blancos de Tehuantepec, Mexican White-lipped Snake
  Symphimus mayae (Gaige, 1936) -- valid -- Culebra-labios blancos maya, Yucatán White-lipped Snake
  Sympholis Cope, 1862 -- valid
  Sympholis lippiens Cope, 1862 -- valid -- Culebra cola corta-mexicana, Mexican Short-tail Snake
  Tachydromus Oppel, 1811 -- invalid
  Tantalophis Duellman, 1958 -- valid
  Tantalophis discolor (Günther, 1860) -- valid -- Culebra-ojo de gato-falsa oaxaqueña, Oaxacan Cat-eyed Snake
  Tantilla Baird and Girard, 1853 -- valid -- Black-headed Snakes, Crowned Snakes, Flat-headed Snakes
  Tantilla atriceps (Günther, 1895) -- valid -- Culebra-encapuchada mexicana, Mexican Black-headed Snake, Mexican Blackhead Snake
  Tantilla bocourti (Günther, 1895) -- valid -- Bocourt's Black-headed Snake, Culebra-encapuchada de Bocourt
  Tantilla briggsi Savitzky and H. M. Smith, 1971 -- valid -- Briggs' Centipede Snake, Culebra-ciempiés de Briggs
  Tantilla calamarina Cope, 1866 -- valid -- Culebra-ciempiés del Pacífico, Pacific Coast Centipede Snake
  Tantilla canula Cope, 1876 -- invalid -- Culebra-ciempiés imitacoral
  Tantilla cascadae Wilson and Meyer, 1981 -- valid -- Culebra-ciempiés michoacana, Michoacán Centipede Snake
  Tantilla coronadoi Hartweg, 1944 -- valid -- Culebra-ciempiés guerrerense, Guerreran Centipede Snake
  Tantilla coronata Baird and Girard, 1853 -- valid -- Southeastern Crowned Snake
  Tantilla cuniculator H. M. Smith, 1939 -- valid -- Culebra-ciempiés del Petén
  Tantilla deppei (Bocourt, 1883) -- valid -- Culebra-ciempiés de Deppe, Deppe's Centipede Snake
  Tantilla flavilineata H. M. Smith and Burger, 1950 -- valid -- Culebra-ciempiés rayas amarillas, Yellow-lined Centipede Snake
  Tantilla gracilis Baird and Girard, 1853 -- valid -- Culebra-ciempiés cabeza plana, Flat-headed Snake, Flathead Snake
  Tantilla hobartsmithi Taylor, 1936 -- valid -- Culebra-encapuchada del Suroeste, Smith's Black-headed Snake, Southwestern Black-headed Snake, Southwestern Blackhead Snake
  Tantilla jani (Günther, 1895) -- valid -- Culebra-ciempiés de Jan, Jan's Centipede Snake
  Tantilla miniata Cope, 1863 -- invalid -- Culebra-ciempiés veracruzana
  Tantilla moesta (Günther, 1863) -- valid -- Blackbelly Centipede Snake, Culebra-ciempiés vientre negro
  Tantilla morgani Hartweg, 1944 -- invalid -- Culebra-encapuchada de Morgan
  Tantilla nigriceps Kennicott, 1860 -- valid -- Culebra-encapuchada de pradera, Plains Black-headed Snake, Plains Blackhead Snake
  Tantilla oaxacae Wilson and Meyer, 1971 -- valid -- Culebra-ciempiés oaxaqueña, Oaxacan Centipede Snake
  Tantilla oolitica Telford, 1966 -- valid -- Rim Rock Crowned Snake
  Tantilla planiceps (Blainville, 1835) -- valid -- California Black-headed Snake, Culebra-encapuchada californiana, Western Black-headed Snake, Western Blackhead Snake
  Tantilla relicta Telford, 1966 -- valid -- Florida Crowned Snake
  Tantilla rubra Cope, 1875 -- valid -- Culebra-encapuchada roja, Red Black-headed Snake, Reddish Black-headed Snake
  Tantilla schistosa (Bocourt, 1883) -- valid -- Culebra-ciempiés de tierra colorada, Red Earth Centipede Snake
  Tantilla shawi Taylor, 1949 -- valid -- Culebra-ciempiés de Potosí, Potosí Centipede Snake
  Tantilla slavensi Pérez-Higareda, H. M. Smith and R. B. Smith, 1985 -- valid -- Culebra-ciempiés de Slavens, Slavens' Centipede Snake
  Tantilla striata Dunn, 1928 -- valid -- Culebra-ciempiés rayada, Striped Centipede Snake
  Tantilla taeniata (Bocourt, 1883) -- valid -- Central American Centipede Snake, Culebra-ciempiés centroamericana
  Tantilla tayrae Wilson, 1983 -- valid -- Culebra-ciempiés del Tacaná, Volcan Tacaná Centipede Snake
  Tantilla wilcoxi Stejneger, 1902 -- valid -- Chihuahuan Black-headed Snake, Chihuahuan Blackhead Snake, Culebra-encapuchada chihuahuense
  Tantilla yaquia H. M. Smith, 1942 -- valid -- Culebra-encapuchada yaqui, Yaqui Black-headed Snake, Yaquia Blackhead Snake
  Tantillita H. M. Smith, 1941 -- valid
  Tantillita brevissima (Taylor, 1937) -- valid -- Culebra-cola corta jaspeada, Speckled Dwarf Short-tail Snake
  Tantillita canula (Cope, 1876) -- valid -- Culebra-ciempiés imitacoral, Yucatecan Dwarf Short-tail Snake
  Tantillita lintoni (H. M. Smith, 1940) -- valid -- Culebra-cola corta de Linton, Linton's Dwarf Short-tail Snake
  Taricha Gray, 1850 -- valid -- Pacific Newts
  Taricha granulosa (Skilton, 1849) -- valid -- Rough-skinned Newt
  Taricha rivularis (Twitty, 1935) -- valid -- Red-bellied Newt
  Taricha torosa (Rathke, 1833) -- valid -- California Newt
  Teiidae Gray, 1827 -- valid -- Ameivas, Ground Lizards, New World Runners, Racerunners, Tegus, Whiptails
  Terrapene Merrem, 1820 -- valid -- American Box Turtles, Box Turtles
  Terrapene bauri Taylor, 1895 -- valid -- Florida Box Turtle
  Terrapene carolina (Linnaeus, 1758) -- valid -- Common Box Turtle, Eastern Box Turtle, tortue tabatière, Tortuga de Carolina
  Terrapene carolina bauri Taylor, 1895 -- invalid -- Florida Box Turtle
  Terrapene carolina carolina (Linnaeus, 1758) -- valid -- Eastern Box Turtle, Woodland Box Turtle
  Terrapene carolina major (Agassiz, 1857) -- valid -- Gulf Coast Box Turtle
  Terrapene carolina triunguis (Agassiz, 1857) -- valid -- Three-toed Box Turtle
  Terrapene coahuila Schmidt and Owens, 1944 -- valid -- Aquatic Box Turtle, Coahuilan Box Turtle, Tortuga de Cuatro CIénegas
  Terrapene nelsoni Stejneger, 1925 -- valid -- Spotted Box Turtle, Tortuga manchada
  Terrapene ornata (Agassiz, 1857) -- valid -- Ornate Box Turtle, Tortuga adornada, Western Box Turtle
  Terrapene ornata cimarronensis Cragin, 1894 -- invalid
  Terrapene ornata luteola Smith and Ramsey, 1952 -- valid -- Desert Box Turtle
  Terrapene ornata ornata (Agassiz, 1857) -- valid -- Ornate Box Turtle, Plains Box Turtle, Western Box Turtle
  Testudines Linnaeus, 1758 -- invalid -- terrapins, tortoises, tortues, Turtles
  Testudinidae Batsch, 1788 -- valid -- Tortoises
  Testudo Linnaeus, 1758 -- valid -- Palearctic Tortoises
  Testudo caretta Linnaeus, 1758 -- invalid
  Testudo carolina Linnaeus, 1758 -- invalid
  Testudo centrata Latreille in Sonnini and Latreille, 1801 -- invalid
  Testudo concinna Le Conte, 1830 -- invalid
  Testudo coriacea Vandelli, 1761 -- invalid
  Testudo ferox Schneider, 1783 -- invalid
  Testudo geographica Le Sueur, 1817 -- invalid
  Testudo graeca Linnaeus, 1758 -- valid -- Moorish Tortoise, Spur-thighed Tortoise
  Testudo guttata Schneider, 1792 -- invalid
  Testudo hermanni Gmelin, 1789 -- valid -- Hermann's Tortoise
  Testudo horsfieldii Gray, 1844 -- valid -- Central Asian Tortoise, Horsfield's Tortoise, Steppe Tortoise
  Testudo imbricata Linnaeus, 1766 -- invalid
  Testudo insculpta Le Conte, 1830 -- invalid
  Testudo kleinmanni Lortet, 1883 -- valid -- Egyptian Tortoise
  Testudo marginata Schoepff, 1793 -- valid -- Marginated Tortoise
  Testudo muhlenbergii Schoepff, 1801 -- invalid
  Testudo mydas Linnaeus, 1758 -- invalid
  Testudo odorata Latreille in Sonnini and Latreille, 1801 -- invalid
  Testudo picta Schneider, 1783 -- invalid
  Testudo polyphemus Daudin, 1801 -- invalid
  Testudo radiata Shaw, 1802 -- invalid
  Testudo reticularia Latreille in Sonnini and Latreille, 1801 -- invalid
  Testudo scripta Thunberg in Schoepff, 1792 -- invalid
  Testudo serpentina Linnaeus, 1758 -- invalid
  Testudo subrubra Lacépède, 1788 -- invalid
  Testudo terrapin Schoepff, 1793 -- invalid
  Thalassochelys kempii Garman, 1880 -- invalid
  Thamnophis Fitzinger, 1843 -- valid -- Garter Snakes, North American Gartersnakes, Ribbon Snakes
  Thamnophis atratus (Kennicott in Cooper, 1860) -- valid -- Aquatic Garter Snake, Aquatic Gartersnake, Pacific Coast Aquatic Garter Snake, Santa Cruz Garter Snake, Western Aquatic Garter Snake
  Thamnophis brachystoma (Cope, 1892) -- valid -- Short-headed Garter Snake, Short-headed Gartersnake, Shorthead Garter Snake
  Thamnophis butleri (Cope, 1889) -- valid -- Butler's Garter Snake, Butler's Gartersnake
  Thamnophis chrysocephalus (Cope, 1885) -- valid -- Culebra-listonada cabeza dorada, Goldenhead Garter Snake
  Thamnophis couchii (Kennicott in Baird, 1859) -- valid -- Couch's Garter Snake, Sierra Garter Snake, Sierra Gartersnake, Western Aquatic Garter Snake
  Thamnophis cyrtopsis (Kennicott, 1860) -- valid -- Black-necked Garter Snake, Black-necked Gartersnake, Blackneck Garter Snake, Culebra-listonada cuello negro
  Thamnophis digueti (Mocquard, 1899) -- invalid -- Culebra-listonada de Diguet
  Thamnophis elegans (Baird and Girard, 1853) -- valid -- Culebra-listonada elegante, Terrestrial Garter Snake, Western Terrestrial Garter Snake
  Thamnophis eques (Reuss, 1834) -- valid -- Culebra-listonada del sur-mexicano, Mexican Garter Snake, Mexican Gartersnake
  Thamnophis errans H. M. Smith, 1942 -- valid -- Culebra-listonada errante, Mexican Wandering Garter Snake
  Thamnophis exsul Rossman, 1969 -- valid -- Culebra-listonada de montaña, Montane Garter Snake
  Thamnophis fulvus (Bocourt, 1893) -- valid -- Culebra-listonada amarillenta, Highland Garter Snake
  Thamnophis gigas Fitch, 1940 -- valid -- Giant Garter Snake, Giant Gartersnake
  Thamnophis godmani (Günther, 1894) -- valid -- Culebra-listonada de Godman, Godman's Garter Snake
  Thamnophis hammondii (Kennicott, 1860) -- valid -- Two-striped Garter Snake, Two-striped Gartersnake
  Thamnophis marcianus (Baird and Girard, 1853) -- valid -- Checkered Garter Snake, Checkered Gartersnake, Culebra-listonada manchada
  Thamnophis melanogaster (Peters, 1864) -- valid -- Blackbelly Garter Snake, Culebra-de agua vientre negro
  Thamnophis mendax Walker, 1955 -- valid -- Culebra-listonada tamaulipeca, Tamaulipan Montane Garter Snake
  Thamnophis ordinoides (Baird and Girard, 1852) -- valid -- Northwestern Garter Snake, Northwestern Gartersnake, Puget Sound Garter Snake
  Thamnophis proximus (Say in James, 1823) -- valid -- Culebra-listonada occidental, Western Ribbon Snake, Western Ribbonsnake
  Thamnophis pulchrilatus (Cope, 1885) -- valid -- Culebra-listonada de tierras altas-mexicana, Yellow-throated Garter Snake
  Thamnophis radix (Baird and Girard, 1853) -- valid -- Eastern Plains Garter Snake, Plains Garter Snake, Plains Gartersnake
  Thamnophis rufipunctatus (Cope, 1875) -- valid -- Culebra-de agua cabeza angosta, Narrow-headed Garter Snake, Narrow-headed Gartersnake, Narrowhead Garter Snake, Narrowhead Watersnake
  Thamnophis sauritus (Linnaeus, 1766) -- invalid -- Eastern Ribbon Snake, Eastern Ribbonsnake
  Thamnophis scalaris Cope, 1861 -- valid -- Culebra-listonada de montaña-cola larga, Longtail Alpine Garter Snake
  Thamnophis scaliger (Jan, 1863) -- valid -- Culebra-listonada de montaña-cola corta, Short-tail Alpine Garter Snake
  Thamnophis sirtalis (Linnaeus, 1758) -- valid -- Common Garter Snake, Common Gartersnake, couleuvre rayée, Culebra-listonada común
  Thamnophis sirtalis concinnus (Hallowell, 1852) -- valid -- Red-spotted Garter Snake, Red-spotted Gartersnake
  Thamnophis sirtalis infernalis (Blainville, 1835) -- valid -- California Red-sided Garter Snake, California Red-sided Gartersnake
  Thamnophis sirtalis tetrataenia (Cope in Yarrow, 1875) -- valid -- San Francisco Garter Snake, San Francisco Gartersnake
  Thamnophis sumichrasti (Cope, 1867) -- valid -- Culebra-listonada de Sumichrast, Sumichrast's Garter Snake
  Thamnophis valida (Kennicott, 1860) -- invalid -- Culebra-listonada de la costa-oeste
  Thecadactylus Cuvier, 1820 -- valid -- Turnip-tailed Geckos
  Thecadactylus rapicauda (Houttuyn, 1782) -- valid -- Turnip-tailed Gecko
  Toluca Kennicott, 1859 -- invalid
  Toluca amphisticha H. M. Smith and Laufe, 1945 -- invalid -- Culebra-toluqueña manchas gemelas
  Toluca conica Taylor and H. M. Smith, 1942 -- invalid -- Culebra-toluqueña manchas grandes
  Toluca lineata Kennicott, 1859 -- invalid -- Culebra-toluqueña lineada
  Toluca megalodon Taylor and H. M. Smith, 1942 -- invalid -- Culebra-toluqueña de San Felipe
  Tomistoma Müller, 1846 -- valid -- False Gavial
  Tomistoma schlegelii (Müller, 1838) -- valid -- False Gavial, False Gharial, Malay Gavial, Sunda Gavial, Tomistoma
  Trachemys Agassiz, 1857 -- valid -- slider turtles, Sliders
  Trachemys decorata (Barbour and Carr, 1940) -- valid -- Hispaniolan Slider
  Trachemys decussata (Bell in Griffith and Pidgeon, 1830) -- valid -- Cuban Slider, North Antillean slider
  Trachemys dorbigni (Duméril and Bibron, 1835) -- valid -- D'Orbigny's Slider, Orbigny's Slider
  Trachemys gaigeae (Hartweg, 1939) -- valid -- Big Bend Slider, Mexican Plateau Slider
  Trachemys scripta (Thunberg in Schoepff, 1792) -- valid -- Common Slider, Pond Slider, slider, tortue à oreilles rouges, Tortuga gravada
  Trachemys scripta callirostris (Gray, 1856) -- invalid -- Columbian slider
  Trachemys scripta elegans (Wied-Neuwied, 1839) -- valid -- Red-eared Slider
  Trachemys scripta scripta (Thunberg in Schoepff, 1792) -- valid -- Yellow-bellied Slider
  Trachemys scripta troostii (Holbrook, 1836) -- valid -- Cumberland Slider
  Trachemys stejnegeri (Schmidt, 1928) -- valid -- Antillean Slider, Central Antillean Slider
  Trachemys stejnegeri malonei (Barbour and Carr, 1938) -- valid -- Inagua Slider
  Trachemys stejnegeri stejnegeri (Schmidt, 1928) -- valid -- Puerto Rican Slider
  Trachemys terrapen (Lacépède, 1788) -- invalid -- Cat Island turtle, Jamaican slider
  Tretanorhinus A. M. C. Duméril, Bibron and A. H. A. Duméril, 1854 -- valid
  Tretanorhinus nigroluteus Cope, 1861 -- valid -- Culebra-buceadora vientre naranja, Orangebelly Swamp Snake
  Trimeresurus Lacépède, 1804 -- valid
  Trimeresurus purpureomaculatus andersoni Theobald, 1868 -- invalid
  Trimeresurus purpureomaculatus purpureomaculatus (Gray, 1832) -- invalid
  Trimorphodon Cope, 1861 -- valid -- Lyre Snakes, Lyresnakes
  Trimorphodon biscutatus (A. M. C. Duméril, Bibron and A. H. A. Duméril, 1854) -- valid -- Costal Lyre Snake, Culebra-lira cabeza negra, Western Lyre Snake
  Trimorphodon tau Cope, 1870 -- valid -- Culebra-lira mexicana, Mexican Lyre Snake
  Trionychidae Gray, 1825 -- valid -- Softshell Turtles
  Trionyx Geoffroy Saint-Hilaire, 1809 -- valid -- African Softshell Turtles, Softshell Turtles
  Trionyx ater Webb and Legler, 1960 -- invalid -- Cuatro Cienegas softshell turtle
  Trionyx ferox (Schneider, 1783) -- invalid
  Trionyx ferox aspera (Agassiz, 1857) -- invalid
  Trionyx ferox emoryi (Agassiz, 1857) -- invalid
  Trionyx ferox hartwegi (Conant and Goin, 1948) -- invalid
  Trionyx ferox spinifera Le Sueur, 1827 -- invalid
  Trionyx gangeticus Cuvier, 1825 -- invalid -- Indian Softshell Turtle
  Trionyx hurum Gray, 1830 -- invalid -- Peacock Softshell Turtle
  Trionyx muticus Le Sueur, 1827 -- invalid
  Trionyx nigricans Anderson, 1875 -- invalid -- Black Softshell Turtle
  Trionyx sinensis Wiegmann, 1835 -- invalid
  Trionyx spiniferus Le Sueur, 1827 -- invalid -- Spiny Softshell Turtle
  Trionyx steindachneri Siebenrock, 1906 -- invalid -- Wattle-necked Softshell Turtle
  Trionyx triunguis (Forskål, 1775) -- valid -- African Softshell Turtle, Nile Softshell Turtle
  Tropidoclonion Cope, 1860 -- valid -- Lined Snakes
  Tropidoclonion lineatum (Hallowell, 1856) -- valid -- Lined Snake
  Tropidolaemus Wagler, 1830 -- valid
  Tropidophiidae Brongersma, 1951 -- valid -- Dwarf Boas
  Tropidophis Bibron in Ramon de la Sagra, 1840 -- valid -- Dwarf Boas
  Tropidophis melanurus (Schlegel, 1837) -- valid -- Dusky Dwarf Boa, Giant Trope, Wood Snake
  Tropiduridae -- valid -- Tropidurid Lizards
  Tropidurus Wied-Neuwied, 1824 -- valid
  Typhlina Wagler, 1830 -- invalid
  Typhlomolge Stejneger, 1896 -- invalid -- Texas Blind Salamanders
  Typhlomolge rathbuni Stejneger, 1896 -- invalid -- Texas Blind Salamander
  Typhlomolge robusta Longley, 1978 -- invalid -- Blanco Blind Salamander, Robust Blind Salamander
  Typhlopidae Merrem, 1820 -- valid -- Blind Snakes, Blindsnakes, Typical Blind Snakes
  Typhlops Oppel, 1811 -- valid -- Blind Snakes, Blindsnakes
  Typhlops granti Ruthven and Gaige, 1935 -- invalid -- Grant's Blind Snake, Grant's Blindsnake
  Typhlops microstomus Cope, 1866 -- invalid -- Serpiente-ciega yucateca
  Typhlops monensis Schmidt, 1926 -- invalid -- Mona Blind Snake, Mona Blindsnake
  Typhlops richardii A. M. C. Duméril and Bibron, 1844 -- invalid -- Richard's Blind Snake, Richard's Blindsnake
  Typhlops rostellatus Stejneger, 1904 -- valid -- Puerto Rican Wetland Blind Snake, Puerto Rican Wetland Blindsnake, Puerto Rican Worm Snake
  Typhlops sulcatus Cope, 1868 -- valid -- Island Worm Snake, Sulcate Blind Snake, Sulcate Blindsnake
  Typhlotriton Stejneger, 1892 -- invalid -- Grotto Salamanders
  Typhlotriton spelaeus Stejneger, 1892 -- invalid -- Grotto Salamander
  Uma Baird, 1859 -- valid -- Fringe-toed Lizards
  Uma exsul K. P. Schmidt and Bogert, 1947 -- valid -- Fringe-toed Sand Lizard, Lagartija-arenera proscrita
  Uma inornata Cope, 1895 -- valid -- Coachella Valley Fringe-toed Lizard
  Uma notata Baird, 1859 -- valid -- Colorado Desert Fringe-toed Lizard, Lagartija-arenera del Colorado
  Uma paraphygas Williams, Chrapliwy and H. M. Smith, 1959 -- valid -- Chihuahuan Fringe-toed Lizard, Lagartija-arenera de Chihuahua
  Uma scoparia Cope, 1894 -- valid -- Mojave Fringe-toed Lizard
  Urosaurus Hallowell, 1854 -- valid -- Brush Lizards, Tree Lizards
  Urosaurus auriculatus (Cope, 1871) -- valid -- Lagartija-arbolera de Socorro, Socorro Island Tree Lizard
  Urosaurus bicarinatus (A. H. A. Duméril, 1856) -- valid -- Lagartija-arbolera tropical, Tropical Tree Lizard
  Urosaurus clarionensis (Townsend, 1890) -- valid -- Clarion Island Tree Lizard, Lagartija-arbolera de Clarion
  Urosaurus gadovi (K. P. Schmidt, 1921) -- valid -- Gadow's Tree Lizard, Lagartija-arbolera de Gadow
  Urosaurus graciosus Hallowell, 1854 -- valid -- Lagartija-arbolera cola larga, Long-tailed Brush Lizard
  Urosaurus irregularis (Fischer, 1882) -- invalid -- Lagartija-arbolera mexicana
  Urosaurus lahtelai Rau and Loomis, 1977 -- valid -- Baja California Brush Lizard, Lagartija-arbolera de Baja California
  Urosaurus microscutatus (Van Denburgh, 1894) -- invalid -- Lagartija-arbolera escamas chicas, Small-scaled Lizard
  Urosaurus nigricaudus (Cope, 1864) -- valid -- Baja California Brush Lizard, Lagartija-arbolera cola negra, Small-scaled Lizard
  Urosaurus ornatus (Baird in Baird and Girard, 1852) -- valid -- Lagartija-arbolera común, Ornate Tree Lizard, Tree Lizard
  Urosaurus ornatus levis (Stejneger, 1890) -- valid -- Canyon Tree Lizard, Smooth Tree Lizard
  Urosaurus ornatus linearis (Baird, 1859) -- valid -- Lined Tree Lizard
  Urosaurus ornatus symmetricus (Baird, 1859) -- valid -- Colorado River Tree Lizard
  Urosaurus ornatus wrighti (K. P. Schmidt, 1921) -- valid -- Northern Cliff Lizard, Northern Tree Lizard
  Urotheca Bibron, 1843 -- valid
  Urotheca andrewsi (H. M. Smith, 1942) -- invalid
  Urotheca bicolor (H. M. Smith, 1941) -- invalid
  Urotheca elapoides (Cope, 1860) -- invalid -- Culebra-imita coral común
  Uta Baird and Girard in Stansbury, 1852 -- valid -- Side-blotched Lizards
  Uta antiqua Ballinger and Tinkle, 1968 -- invalid -- Lagartija-costado manchado de San Lorenzo
  Uta concinna Dickerson, 1919 -- invalid -- Lagartija-costado manchado antigua
  Uta mannophora Dickerson, 1919 -- invalid -- Lagartija-costado manchado adornada
  Uta nolascensis Van Denburgh and Slevin, 1921 -- valid -- Lagartija-costado manchado o de Nolasco
  Uta palmeri Stejneger, 1890 -- valid -- Lagartija-costado manchado o de San Pedro, San Pedro Side-blotched Lizard
  Uta squamata Dickerson, 1919 -- valid -- Lagartija-costado manchado de Santa Catalina
  Uta stansburiana Baird and Girard, 1852 -- valid -- Common Side-blotched Lizard, Lagartija-costado manchado común, Side-blotched Lizard
  Uta stansburiana elegans Yarrow, 1882 -- valid -- California Side-blotched Lizard, Western Side-blotched Lizard
  Uta stansburiana nevadensis Ruthven, 1913 -- valid -- Nevada Side-blotched Lizard
  Uta stansburiana stansburiana Baird and Girard, 1852 -- valid -- Northern Side-blotched Lizard
  Uta stansburiana uniformis Pack and Tanner, 1970 -- valid -- Colorado Side-blotched Lizard, Plateau Side-blotched Lizard
  Uta symmetrica Baird, 1859 -- invalid
  Uta wrighti K. P. Schmidt, 1921 -- invalid
  Varanidae -- valid -- Monitor Lizards, Monitors
  Varanus Merrem, 1820 -- valid -- Monitor Lizards
  Varanus acanthurus Boulenger, 1885 -- valid
  Varanus albigularis (Daudin, 1802) -- valid
  Varanus auffenbergi Sprackland, 1999 -- valid
  Varanus baritji King and Horner, 1987 -- valid
  Varanus beccarii (Doria, 1874) -- valid
  Varanus bengalensis (Daudin, 1802) -- valid -- Bengal Monitor
  Varanus boehmei Jacobs, 2003 -- valid
  Varanus bogerti Mertens, 1950 -- valid
  Varanus brevicauda Boulenger, 1898 -- valid
  Varanus caerulivirens Ziegler, Böhme and Philipp, 1999 -- valid
  Varanus caudolineatus Boulenger, 1898 -- valid
  Varanus cerambonensis Philipp, Böhme and Ziegler, 1999 -- valid
  Varanus doreanus (Meyer, 1874) -- valid
  Varanus dumerilii (Schlegel, 1839) -- valid
  Varanus eremius Lucas and Frost, 1895 -- valid
  Varanus exanthematicus (Bosc, 1792) -- valid
  Varanus finschi Böhme, Horn and Ziegler, 1994 -- valid
  Varanus flavescens (Hardwicke and Gray, 1827) -- valid -- Short-toed Monitor, Yellow Monitor
  Varanus giganteus (Gray, 1845) -- valid
  Varanus gilleni Lucas and Frost, 1895 -- valid
  Varanus glauerti Mertens, 1957 -- valid
  Varanus glebopalma Mitchell, 1955 -- valid
  Varanus gouldii (Gray, 1838) -- valid
  Varanus griseus (Daudin, 1803) -- valid -- Desert Monitor, Grey Monitor
  Varanus indicus (Daudin, 1802) -- valid -- Indian Monitor, Indian Monitor Lizard
  Varanus jobiensis Ahl, 1932 -- valid
  Varanus juxtindicus Böhme, Philipp and Ziegler, 2002 -- valid
  Varanus keithhornei Wells and Wellington, 1985 -- valid
  Varanus kingorum Storr, 1980 -- valid
  Varanus komodoensis Ouwens, 1912 -- valid -- Komodo Dragon, Komodo Island Monitor, Komodo Monitor
  Varanus kordensis (Meyer, 1874) -- valid
  Varanus mabitang Gaulke and Curio, 2001 -- valid
  Varanus macraei Böhme and Jacobs, 2001 -- valid
  Varanus melinus Böhme and Ziegler, 1997 -- valid
  Varanus mertensi Glauert, 1951 -- valid
  Varanus mitchelli Mertens, 1958 -- valid
  Varanus nebulosus (Gray, 1831) -- valid
  Varanus niloticus (Linnaeus in Hasselquist, 1762) -- valid -- Nile Monitor
  Varanus olivaceus Hallowell, 1856 -- valid -- Gray's Monitor
  Varanus ornatus (Daudin, 1802) -- valid
  Varanus panoptes Storr, 1980 -- valid
  Varanus pilbarensis Storr, 1980 -- valid
  Varanus prasinus (Schlegel, 1839) -- valid
  Varanus primordius Mertens, 1942 -- valid
  Varanus reisingeri Eidenmüller and Wicker, 2005 -- valid
  Varanus rosenbergi Mertens, 1957 -- valid
  Varanus rudicollis (Gray, 1845) -- valid
  Varanus salvadorii (Peters and Doria, 1878) -- valid
  Varanus salvator (Laurenti, 1768) -- valid -- Common Water Monitor
  Varanus scalaris Mertens, 1941 -- valid
  Varanus semiremex Peters, 1869 -- valid
  Varanus similis Mertens, 1958 -- valid
  Varanus spenceri Lucas and Frost, 1903 -- valid
  Varanus spinulosus Mertens, 1941 -- valid
  Varanus storri Mertens, 1966 -- valid
  Varanus telenesetes Sprackland, 1991 -- valid
  Varanus timorensis (Gray, 1831) -- valid
  Varanus tristis (Schlegel, 1839) -- valid
  Varanus varius (Shaw, 1790) -- valid
  Varanus yemenensis Böhme, Joger and Schätti, 1989 -- valid
  Varanus yuwonoi Harvey and Barker, 1998 -- valid
  Varanus zugorum Böhme and Ziegler, 2005 -- valid
  Vipera Laurenti, 1768 -- valid
  Vipera aspis balcanica Buresch and Zonkov, 1934 -- invalid
  Viperidae Oppel, 1811 -- valid -- Pit Vipers, Vipers
  Viperinae Oppel, 1811 -- valid
  Virginia Baird and Girard, 1853 -- invalid -- Earth Snakes, Earthsnakes, Smooth Earthsnakes
  Virginia striatula (Linnaeus, 1766) -- invalid -- Rough Earth Snake, Rough Earthsnake
  Virginia valeriae Baird and Girard, 1853 -- invalid -- Smooth Earth Snake, Smooth Earthsnake
  Xantusia Baird, 1859 -- valid -- night lizards
  Xantusia bolsonae Webb, 1970 -- valid -- Bolson Night Lizard, Lagartija-escofina de Mapimí
  Xantusia henshawi Stejneger, 1893 -- valid -- Granite Night Lizard, Henshaw's Night Lizard, Lagartija-escofina de granito
  Xantusia riversiana Cope, 1883 -- valid -- Island Night Lizard
  Xantusia vigilis Baird, 1859 -- valid -- Desert Night Lizard, Lagartija-escofina de desierto
  Xantusiidae -- valid -- night lizards
  Xenodon F. Boie, 1827 -- valid
  Xenodon rabdocephalus (Wied-Neuwied, 1824) -- valid -- Culebra-engañosa norteña, False Fer-de-lance
  Xenopus Wagler, 1827 -- valid -- Clawed Frogs
  Xenopus laevis (Daudin, 1802) -- valid -- African Clawed Frog, Rana-de garras africana
  Xenosaurus grandis (Gray, 1856) -- valid -- Knob-scaled Lizard, Xenosaurio mayor
  Xenosaurus newmanorum Taylor, 1949 -- valid -- Newman's Knob-scaled Lizard, Xenosaurio de Newman
  Xenosaurus platyceps King and Thompson, 1968 -- valid -- Flathead Knob-scaled Lizard, Xenosaurio cabeza plana
  Xenosaurus rectocollaris Smith and Iverson, 1993 -- valid -- Pallid Knob-scaled Lizard
  Xerobates agassizii Cooper, 1861 -- invalid
  Xerobates berlandieri Agassiz, 1857 -- invalid
  Xiphosurus Fitzinger, 1826 -- invalid -- Hispaniolan Giant Anole, Puerto Rican Giant Anole
  Xiphosurus cuvieri (Merrem, 1820) -- invalid -- Puerto Rican Giant Anole
  Xiphosurus roosevelti (Grant, 1931) -- invalid -- Culebra Island Giant Anole
   

A gray bar