Nephelomys levipes
[3] It is found on the eastern slope of the Andes from southeastern Peru into west-central Bolivia in cloud forest at elevations from 1,800 to 3,200 metres (5,900 to 10,500 ft).[2] In 1902, Oldfield Thomas first described this species, under the name Oryzomys levipes, on the basis of specimens from both Peru and Bolivia.[4] In 1944, Philip Hershkovitz relegated both O. levipes and O. keaysi to the synonymy of O. albigularis,[5] where it remained until it was reinstated a species in the early 1990s on the basis of genetic and other differences.[3] It is similar to N. keaysi, but smaller, and the fur on the underparts is buffy instead of whitish in the specimens Thomas examined.[4] The incisive foramina, which perforate the palate between the incisors and the molars, are long and narrow.