Nephelomys keaysi
[3] It is found from southeastern Peru to northern Bolivia on the eastern slope of the Andes in Yungas humid forest at altitudes of 1000 to 2600 m.[1] Although its continued existence is not in serious danger and it is listed as "least concern", destruction of its habitat may pose a threat to some populations.[1] In 1900, Joel Asaph Allen described two rodents from Juliaca, Peru, at an altitude of 6,000 feet (1,800 m) on the basis of specimens collected in 1899 and 1900 by H. H. Keays.[5] Oldfield Thomas, in reporting on some specimens from Peru, concurred with the latter allocation, but considered O. keaysi to be part of the group around O. albigularis, and suggested that these should perhaps all be placed in the same species.[7] In 1944, Philip Hershkovitz published a revision of the genus Nectomys as then understood, and in comparing it to what is now Sigmodontomys alfari, he listed, in a footnote, the names he understood as synonyms of Oryzomys albigularis.[8] This list included both keaysi and obtusirostris, and since then the two have remained associated with each other and with O. albigularis, initially as synonyms or subspecies.