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The genus Callicebus comprises 28 species distributed in the Amazonia and Atlantic forest biomes. This paper describes the karyotype of C. coimbrai, a rare and threatened species and compar es it with related species (C. personatus and C. nigrifrons). The karyotype was characterized by G-, C-sequential and NOR banding. C. coimbrai presented 2n=44 chromosomes, with G-banding pattern similar to that observed in C. personatus (2n=44) and C. nigrifrons (2n=42). The karyotypic divergence between C. coimbrai and C. nigrifrons is explained by a single rearrangement of centric fusion/fission. The chromosomal data obtained suggest a closer association between C. coimbrai and C. personatus than with C. nigrifrons.

Karyotypic study of Callicebus coimbrai: a rare and threatened primate species from Brazil