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 Oligoryzomys fulvescens (Saussure 1860) [Oligoryzomys] fulvescens (Saussure 1860) , Rev. Mag. Zool. Paris, ser. 2, 12: 102 . Type Locality: México , Veracruz State , Orizaba (as restricted by Merriam, 1901 a :295 ) . Vernacular Names: Fulvous Colilargo . Synonyms: Oligoryzomys costaricensis (J. A. Allen 1893) ; Oligoryzomys delicatus (J. A. Allen and Chapman 1897) ; Oligoryzomys fulvescens (Saussure 1860) ; Oligoryzomys engraciae ( Osgood 1945 ) ; Oligoryzomys lenis (Goldman 1915) ; Oligoryzomys mayensis ( Goldman 1918 ) ; Oligoryzomys messorius (Thomas 1901) ; Oligoryzomys munchiquensis (J. A. Allen 1912) ; Oligoryzomys navus (Bangs 1899) ; Oligoryzomys nicaraguae (J. A. Allen 1910 ) ; Oligoryzomys pacificus ( Hooper 1952 ) ; Oligoryzomys tenuipes (J. A. Allen 1904) . Distribution: W and E versants of S México , through Central America, to Ecuador , N and C Venezuela , Guianas, and northernmost Brazil in South America. Conservation: IUCN – Lower Risk (lc). Discussion: All Middle American forms retained as subspecies by some (see Hall, 1981 ; Jones and Engstrom, 1986 ). Morphometric variation among Middle American forms evaluated by Carleton and Musser (1995) and their morphology contrasted with O. vegetus . Reported karyotypic variation intimates that more than one species occurs among the listed synonyms ( Andrades-Miranda et al., 2001 a ; Gardner and Patton, 1976 ; Haiduk et al., 1979 ), whose status, particularly the South American taxa provisionally associated by Carleton and Musser (1995) , warrants additional study. Linares (1998) , e.g., recognized all Venezuelan populations (except O. griseolus ) as O. fulvescens ; whereas, Andrades-Miranda et al. (2001 a ) listed specimens from Roraima , Brazil , as O . cf. messorius , a form described from Guyana ; and see Voss et al. (2001) for another regional perspective regarding discrimination and specific assignment of Guianan samples vis a vis lowland populations in Middle America ( O. fulvescens ) and N Brazil ( O. microtis ).