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 Oryzomys polius Osgood 1913 Oryzomys polius Osgood 1913 , Field Mus . Nat. Hist. Publ., Zool. Ser., 10: 97 . Type Locality: Perú , Amazonas Dept., mountains east of Balsas, Tambo Carrizal, 5000 ft ( 1524 m ). Vernacular Names: Maranon Oryzomys . Distribution: NC Perú ( Amazonas , Cajamarca , Piura ). Conservation: IUCN – Lower Risk (lc). Discussion: Affinities obscure; compared to O. xanthaeolus by Osgood (1913) . A valid and very distinctive species, all locality records so far confined to the dry lowlands of the upper Río Marañon basin, east of the N Peruvian Andes.