Oecomys concolor (Wagner 1845)

[Hesperomys] concolor Wagner 1845, Arch. Naturgesch., 11: 147.

Type Locality: Brazil, Amazonas State, Rio Curicuriari, a tributary of the upper Rio Negro, below São Gabriel.

Vernacular Names: Unicolored Oecomys.

Synonyms: Oecomys marmorsurus (Thomas 1899) .

Distribution: S Venezuela south of the llanos (see Linares, 1998:Fig 142), NW Brazil, E Colombia, and NE Bolivia (as per Anderson, 1997); range limits poorly documented.

Conservation: IUCN – Lower Risk (lc).

Discussion: Oecomys concolor proper has a restricted distribution compared with Hershkovitz’s (1960) broad view of its contents; most of those forms are actually synonyms of the very different species O. flavicans, O. roberti, O. superans, or O. trinitatis . Characters of the skin and skull indicate that O. concolor is closely related to O. mamorae .