Class [Mammalia] Linnaeus, 1758 - mammals
Order Rodentia Bowdich, 1821 - rodents
Family Muridae Batsch, 1788 - rats, mice, hamsters, voles, lemmings, and gerbils
Subfamily Murinae Batsch, 1788 - Old World mice and rats
Genus Hydromys Geoffroy Saint-Hilaire, 1804 - beaver-rats
1 Hydromys chrysogaster E. Geoffroy, 1804 - beaver-rat
2 Hydromys habbema Tate & Archbold, 1941 - mountain water rat
3 Hydromys hussoni Musser & Piik, 1982
4 Hydromys neobritannicus Tate & Archbold, 1935
see Hydromys neobrittanicus Tate & Archbold, 1935