Chromosome studies in Edentata.

The karyotypes of three additional species of Edentata are described. The differences in karyotype between Tolypeutes matacus (2n = 38), and other species of armadillo is remarkable. Three species of Euphractini were compared through G- and C-banding patterns. Chaetophractus villosus appears to be much closer to Zaedyus pichiy than suggested by taxonomy. On the other hand, Tamandua tetradactyla and Tamandua longicaudata, two different species of anteater, possess the same karyotypes. The presence of an unusual Y-chromosome in Choloepus hoffmanni may be responsible for the peculiar sex-ratio reported in this species.