Oligoryzomys delticola Thomas 1917

Oligoryzomys delticola Thomas 1917, Ann. Mag. Nat. Hist., ser. 8, 20: 96.

Type Locality: Argentina, Buenos Aires Prov., Delta del Paraná, Isla Ella, 1 m.

Vernacular Names: Large Colilargo.

Distribution: EC Argentina, Uruguay, and S Brazil (Rio Grande do Sul).

Conservation: IUCN – Lower Risk (lc).

Discussion: A large-bodied species that karyotypically and morphometrically resembles O. eliurus and O. nigripes; the level of differentiation among the three and their appropriate taxonomic status require additional investigation (see comparisons and commentary in Andrades-Miranda et al. [2001 a], Bonvicino and Weksler [1998], Espinoza and Reig [1991], and Myers and Carleton [1981]).