Wilfredomys Avila-Pires, 1960 . Bol. Mus. Nac., Nov. Ser., Rio de Janeiro, 220:3.

TYPE SPECIES: Thomasomys oenax Thomas, 1928 .

COMMENTS: Genus diagnosed to encompass another problematic thomasomyine species from SE Brazil; see Osgood (1933b) and Pine (1980b) for historical review of the generic affiliations of the type species. The categorical recognition of this taxon, conventionally treated as a subgenus of Thomasomys (e.g., Carleton and Musser, 1984; Corbet and Hill, 1991; Pine, 1980b), will depend on phylogenetic studies involving other thomasomyines (also see comments under Delomys).