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Keywords:

  • cytotaxonomy;
  • Y chromosome;
  • fusion;
  • owl monkey

Abstract

Twenty-one specimens of Aotus were captured on both sides of the Tocantins river when the hydroelectric reservoir of Tucuruí, Brazil, was filled. The males had a diploid number of 49 chromosomes, and the females had 50. The observed difference is a consequence of the fusion of the Y chromosome with an autosome. The karyotype is similar to that of the Bolivian Aotus (A. azarae boliviensis). It differs, however, in the G- and C-banding patterns of the chromosome resulting from the Y/autosome fusion. The nucleolar organizing region is located on the secondary constriction of a pair of submetacentric chromosomes. Considerations are presented on the classification of A. infulatus as a separate species.