, Volume 34, Issue 2, pp 197–204 | Cite as

Aotus from the southwestern Amazon region is geographically and chromosomally intermediate betweenA. azarae boliviensis andA. infulatus

  • J. C. Pieczarka
  • R. M. de Souza Barros
  • F. M. de FariaJr.
  • C. Y. Nagamachi


We described the karyotypes detected in 23Aotus specimens captured on Southwestern Amazon region (63°30'W, 9°00'S). This region should be occupied byA. nigriceps. However, the animals described here have a fur pattern and a karyotypes similar to those ofA. azarae boliviensis andA. infulatus. The females presented 50 chromosomes and the males 49 as a consequence of fusion between the chromosome Y and an autosome. This sample presented polymorphisms of G- and C-banding and NOR-staining. These animals are karyotypically intermediate betweenA. a. boliviensis andA. infulatus. The taxonomy and karyotypic evolution of these taxa are discussed.

Key Words

Aotus Karyotype Heterochromatin Taxonomy Polymorphism 


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Copyright information

© Japan Monkey Centre 1993

Authors and Affiliations

  • J. C. Pieczarka
    • 1
  • R. M. de Souza Barros
    • 1
  • F. M. de FariaJr.
    • 1
  • C. Y. Nagamachi
    • 1
  1. 1.Departamento de Genetica Centro de Ciencias BiologicasUniversidade Federal do Para, BelémParáBrasil

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