Ctenomys torquatus Lichtenstein, 1830 . Darst. Säugeth., text of pl. 31.

TYPE LOCALITY: Brazil, S provinces, and banks of Uruguay River. See Moojen (1952:188) .

DISTRIBUTION: Uruguay, NE Argentina, extreme S Brazil.

COMMENTS: Considered a distinct species by Ellerman (1940: 167) and Novak (1991:939); but see Cabrera (1961:547) who provisionally included it in brasiliensis . According to Redford and Eisenberg (1992), the chromosome no. is 2n=56-70, indicating the group is probably a superspecies, although Reig et al. (19906) reported a chromosome no. of 2n=44-46.