Order Rodentia - Family Cricetidae Author Wilson, Don E. Author Reeder, DeeAnn text 2005 The Johns Hopkins University Press Baltimore Mammal Species of the World: a Taxonomic and Geographic Reference (3 rd Edition), Volume 2 955 1189 book chapter 0-8018-8221-4 10.5281/zenodo.7316535 Thomasomys pyrrhonotus Thomas 1886 Thomasomys pyrrhonotus Thomas 1886 , Ann. Mag. Nat. Hist., ser. 5, 18: 421 . Type Locality: Perú , Cajamarca Dept., Río Malleta, Tambillo, 5800 ft ( 1768 m ). Vernacular Names: Reddish-backed Thomasomys . Synonyms: Thomasomys auricularis Anthony 1923 . Distribution: Andes of S Ecuador and NW Perú . Conservation: IUCN – Lower Risk (lc). Discussion: Morphology redescribed and additional specimens reported by Pine (1980 b ) . Tirira (1999) listed auricularis as a valid species.