Hydromys E. Geoffroy, 1804 . Bull. Sci. Soc. Philom. Paris, 3(93):353.

TYPE SPECIES: Hydromys chrysogaster E. Geoffroy, 1804 .

SYNONYMS: Baiyankamys .

COMMENTS: Member of the Australian and New Guinea Old Endemics (Musser, 1981c:167). Comparisons with Neotropical ichthyomyines made by Voss (1988). Flannery (1990b) provided photographs and distributional and biological summaries of species. Phallic morphology of H. chrysogaster and H. habbema described by Lidicker (1968). Mahoney (1968) explained why Baiyankamys is a synonym of Hydromys .