Leptomys is a genus of rodent endemic to New Guinea. It is considered part of the New Guinea Old Endemics, meaning it was part of the first wave of murine rodents to colonize the island. Leptomys are seen to have minimal adaptations to their aquatic life style. Elongated hind feet accompanied by elongated centre toes suggest the ability to leap. The third molar which is lost is many rodents is retained, albeit smaller. Small eyes and ears can be seen amongst its velvety soft fur.Walkers Mammals, Nowak, 1983
Species Leptomys arfakensis Musser, Helgen & Lunde, 2008 Long-footed water rat, Leptomys elegans Ernst Mayr's water rat, Leptomys ernstmayri Leptomys paulus Musser, Helgen & Lunde, 2008 Fly River water rat, Leptomys signatus
References
Musser, G. G. and M. D. Carleton. 2005. Superfamily Muroidea. pp. 894–1531 in Mammal Species of the World a Taxonomic and Geographic Reference. D. E. Wilson and D. M. Reeder eds. Johns Hopkins University Press, Baltimore. Musser G.G., Helgen K.M., and Lunde D.P. 2008. Systematic review of New Guinea Leptomys (Muridae, Murinae) with descriptions of two new species. AMERICAN MUSEUM NOVITATES, 3624:1-60.