ABSTRACT. In a study relating geographic distribution of Aotus populations with karyotype and coat pattern, HERSHKOVlTZ (1983) suggested that this genus comprises nine species. A. vociferans (2n = 46) is distributed along the left bank of the Maranon river, and A. nancymai (2n = 54) along the right bank of the same river. In the present study we analyzed the karyotypes of 11 A. vociferans and 11 A. nancymai specimens using G-and C-banding and NOR-staining. Of these animals, five A. vociferans were sympatric with five A. nancymai in Isla Aramaza, Colombia; one A. vociferans was sympatric with three A. nancymai in Yahuma, Peru; one A. vociferans was sympatric with three A. nancymai in Terezinha I, Brazil. No signs of hybridation between the taxa was observed at any time, with all A. vociferans having 2n = 46 and all A. nancymai 2n = 54, as previously reported in the literature. These data suggest that A. vociferans and A. nancymai should indeed be distinct species.

No abstract

No abstract

No abstract