Sigmodontomys J. A. Allen 1897

Sigmodontomys J. A. Allen 1897, Bull. Am. Mus . Nat. Hist., 9: 38.

Type Species: Sigmodontomys alfari J. A. Allen 1897

Species and subspecies: 2 species:

Species Sigmodontomys alfari J. A. Allen 1897

Species Sigmodontomys aphrastus Harris 1932

Discussion: Oryzomyini . Named as a genus but later viewed as a synonym of Nectomys (Ellerman, 1941; Gyldenstolpe, 1932), usually ranked as subgenus (Hershkovitz, 1944). Hershkovitz (1944:71) stressed the weakness of their association: "The apparent relationship of Sigmodontomys to Nectomys ... is probably attributable to an independant development … from the common oryzomyine stock rather than to a divergence from a … more recent Nectomys-like stock," an assessment later corroborated by other data (Gardner and Patton, 1976; Hooper and Musser, 1964a). Gardner and Patton (1976) formally transferred Sigmodontomys to a subgenus of Oryzomys, and we continue to list it as genus, while urging the need to refine its specific contents and their relationships to Oryzomys proper. Cadena et al. (1998) reported a specimen as Sigmodontomys species indeterminate from the Chocó, SW Colombia.