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| Kingdom Animalia |
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Hydromys É. Geoffroy, 1804 – valid – Water Rats
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Hydromys beccarii Peters, 1874 – invalid
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Hydromys chrysogaster É. Geoffroy, 1804 – valid – Common Water Rat
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Hydromys chrysogaster caurinus Thomas, 1909 – invalid
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Hydromys chrysogaster reginae Thomas and Dollman, 1909 – invalid
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Hydromys esox Thomas, 1906 – invalid
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Hydromys esox illuteus Thomas, 1922 – invalid
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Hydromys fuliginosus Gould, 1853 – invalid
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Hydromys fulvogaster Jourdan, 1837 – invalid
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Hydromys fulvolavatus Gould, 1853 – invalid
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Hydromys fulvoventer F. Cuvier, 1837 – invalid
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Hydromys grootensis Troughton, 1935 – invalid
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Hydromys habbema Tate and Archbold, 1941 – invalid – New Guinea Mountain Water Rat
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Hydromys hussoni Musser and Piik, 1982 – valid – Husson's Water Rat
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Hydromys lawnensis Troughton, 1935 – invalid
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Hydromys leucogaster É. Geoffroy, 1804 – invalid
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Hydromys longmani Thomas, 1923 – invalid
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Hydromys melicertes Thomas, 1921 – invalid
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Hydromys moae Troughton, 1935 – invalid
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Hydromys nauticus Thomas, 1921 – invalid
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Hydromys neobritannicus Tate and Archbold, 1935 – valid – New Britain Water Rat
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Hydromys neobrittanicus Tate and Archbold, 1935 – invalid
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Hydromys oriens Troughton, 1937 – invalid
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Hydromys shawmayeri (Hinton, 1943) – invalid – Shaw Mayer's Water Rat
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Hydromys ziegleri Helgen, 2005 – valid
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Microhydromys Tate and Archbold, 1941 – valid – Lesser Shrew Mice
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Microhydromys argenteus Helgen, Leary and Aplin, 2010 – valid – southern groovetoothed moss-mouse
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Microhydromys musseri Flannery, 1989 – invalid – Torricelli Mountains Shrew Mouse
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Microhydromys richardsoni Tate and Archbold, 1941 – valid – Richardson's Shrew Mouse, northern groovetoothed moss-mouse
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Neohydromys Laurie, 1952 – invalid
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Neohydromys fuscus Laurie, 1952 – invalid
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Parahydromys Poche, 1906 – valid
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Parahydromys asper (Thomas, 1906) – valid – New Guinea Waterside Rat
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Pseudohydromys Rümmler, 1934 – valid – New Guinean Shrew Mice
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Pseudohydromys berniceae Helgen and L. Helgen, 2009 – valid – Bishop Moss-mouse
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Pseudohydromys carlae Helgen and L. Helgen, 2009 – valid – Huon Small-toothed Moss-mouse
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Pseudohydromys eleanorae Helgen and L. Helgen, 2009 – valid – Laurie's Moss-mouse
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Pseudohydromys ellermani (Laurie and Hill, 1954) – valid – Shaw Mayer's Shrew Mouse
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Pseudohydromys fuscus (Laurie, 1952) – valid – Mottled-tailed Shrew Mouse
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Pseudohydromys germani (Helgen, 2005) – valid
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Pseudohydromys murinus Rümmler, 1934 – valid – Eastern New Guinea Shrew Mouse
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Pseudohydromys musseri (Flannery, 1989) – valid – Torricelli Mountains Shrew Mouse
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Pseudohydromys occidentalis Tate, 1951 – valid – Western New Guinea Shrew Mouse
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Pseudohydromys patriciae Helgen and L. Helgen, 2009 – valid – Woolley's Moss-mouse
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Pseudohydromys pumehanae Helgen and L. Helgen, 2009 – valid – Southern Small-toothed Moss-mouse
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Pseudohydromys sandrae Helgen and L. Helgen, 2009 – valid – White-bellied Moss-mouse |
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| Kingdom Plantae |
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Hydromystria laevigata (Humb. & Bonpl. ex Willd.) Hunz. – not accepted
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Hydromystria stolonifera G. Mey. – not accepted |
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