Children (14 direct children, 16 direct and indirect children):
Hydromys habbema
Mountain water rat
Hydromys shawmayeri
Shaw mayer's water rat
Western water rat
Husson’s water rat
New britain water rat
Hydromys neobrittanicus
Rakali
(tree size 1)
Austalian water rat
Ziegler's water rat
Hydromys ziegleri
Hydromys esox
(tree size 1)
Hydromys asper
Hydromys caurinus
Hydromys fuliginosus
Hydromys fulvolavatus
Hydromys longmani
Hydromys melicertes
Hydromys nauticus