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 legatus Thomas 1925 Oryzomys legatus Thomas 1925 , Ann. Mag. Nat. Hist., ser. 9, 15: 577 . Type Locality: Bolivia , Tarija Dept., Caraparí, 1000 m . Vernacular Names: Tarija Oryzomys . Distribution: E Andean slopes of SC Bolivia and NW Argentina . Conservation: IUCN – Lower Risk (lc). Discussion: Considered conspecific with O. capito (= O. megacephalus ) (Cabrera, 1961; Hershkovitz, 1960 ), viewed as a probable synonym of O. nitidus ( Gardner and Patton, 1976 ) , or retained as a species ( Gyldenstolpe, 1932 ; Mares et al., 1989 b ; Massoia, 1975 ; Musser and Carleton, 1993 ). Musser et al. (1998) acknowledged the morphological distinctiveness of legatus but ultimately arranged it within a broadly defined O. russatus , a related form of the nitidus species group. This proposed relationship finds no support from trees derived from cytochrome b sequences ( Patton et al., 2000 ), in which specimens of legatus fall among those of O. nitidus proper, not with O. russatus from SE Brazil . In view of the pronounced morphometric differentiation of legatus and nitidus in SC Bolivia (Musser et al., 1998:208-218), we follow Patton et al. (2000) in regarding both as species and stress that the lack of reciprocal monophyly between the respective data sets invites further study.