member of this genus was described in 2005.

List of species

Genus Hydromys - water rats:
*Rakali, Hydromys chrysogaster E. Geoffroy, 1804
*Western water rat, Hydromys hussoni Musser and Piik, 1982
*New Britain water rat, Hydromys neobritannicus Tate and Archbold, 1935
*Ziegler's water rat,