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Nephelomys keaysi
''Nephelomys keaysi'', also known as Keays's oryzomys〔Musser and Carleton, 2005, p. 1149〕 or Keays's rice rat,〔 is a species of rodent in the genus ''Nephelomys'' of family Cricetidae.〔Weksler et al., 2006, p. 18〕 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.〔 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.〔
In 1900, Joel Asaph Allen described two rodents from Juliaca, Peru, at an altitude of on the basis of specimens collected in 1899 and 1900 by H. H. Keays. One he named, after Keays, ''Oryzomys keaysi'', and the other ''Oryzomys obtusirostris''. He considered the former to have no close relatives〔Allen, 1900, p. 225〕 and the latter to be close to ''O. longicaudatus''.〔Allen, 1900, p. 226〕 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.〔Thomas, 1901, p. 188〕 After re-examining his specimens of ''O. obtusirostris'', Allen reclassified the animal to the genus ''Zygodontomys'' in 1913, as ''Zygodontomys obtusirostris'', but admitted that it was atypical for its long tail.〔Allen, 1913, p. 599〕 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''.〔Hershkovitz, 1944, p. 72, footnote 16〕 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. By the 1990s, however, the distinctiveness of ''O. keaysi'' with respect to both ''O. albigularis'' and ''O. levipes'' was recognized, and as a result ''O. keaysi'' was again classified as a separate species, now with ''O. obtusirostris'' as a synonym.〔 When ''O. albigularis'' and related species were transferred to the new genus ''Nephelomys'' in 2006, this arrangement remained in place, but with the species now known as ''Nephelomys keaysi''.〔
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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