Oecomys bicolor (Tomes 1860) [Oecomys] bicolor (Tomes 1860), Proc. Zool. Soc. Lond., 1860: 217. Type Locality: Ecuador, Morona-Santiago Prov., Gualaquiza, Río Gualaquiza, 885 m. Vernacular Names: White-bellied Oecomys. Synonyms: Oecomys benevolens (Thomas 1901); Oecomys dryas (Thomas 1900); Oecomys endersi Goldman 1933; Oecomys florenciae J. A. Allen 1916; Oecomys milleri J. A. Allen 1916; Oecomys nitedulus Thomas 1910; Oecomys occidentalis (Hershkovitz 1960); Oecomys phelpsi Tate 1939; Oecomys rosilla (Thomas 1904); Oecomys trabeatus G. M. Allen and Barbour 1923. Distribution: E Panamá to W Colombia and Ecuador; Venezuela, Guianas, N and C Brazil; Amazonian drainage of Bolivia, Perú, Ecuador, and Colombia. Conservation: IUCN – Lower Risk (lc). Discussion: Synonymy of O. phelpsi Tate attributed by Musser and Patton (1989). A morphologically and genetically distinct member of the bicolor complex, species identity uncertain, was collected at localities nearby those of O. bicolor proper in the Rio Juruá basin, W Brazil (Patton et al., 2000).

Published as part of Wilson, Don E. & Reeder, DeeAnn, 2005, Order Rodentia - Family Cricetidae, pp. 955-1189 in Mammal Species of the World: a Taxonomic and Geographic Reference (3 rd Edition), Volume 2, Baltimore :The Johns Hopkins University Press on page 1137, DOI: 10.5281/zenodo.7316535