Aotus trivirgatus (Owl monkey)

2n = 54
  • T. C. Hsu
  • Kurt Benirschke


The male karyotype came from a skin biopsy kindly supplied by Dr. C. Gray, National Zoological Park, Washington, D. C, USA; that of the female was from a skin biopsy supplied by Dr. R. Hunt, New England Regional Primate Research Center, Southborough, Massachusetts, USA. Dr. Hunt supplied three other specimens including one male which has 2n=50/51, similar to that described by Chiarelli and Barberis. Thus, polymorphism presumably exists in this species. The biarmed elements are here placed in the first two rows. Some acrocentrics also have very small short arms. The metacentric marker autosome pair with its pronounced secondary constriction is placed before the sex chromosomes. It is also present in the karyotype with 2n=50. In most karyotypes the very small Y appears to be metacentric.


Public Health Chromosome Number Skin Biopsy World Monkey Secondary Constriction 
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  1. 1).
    Chu, E.H.Y. and Bender, M.A.: Chromosome cytology and evolution in primates. Science 133:1399, 1961.PubMedCrossRefGoogle Scholar
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    Chiarelli, B.: Some chromosome numbers in primates. Mammalian Chromosomes Newsletter No. 6, 3, 1961.Google Scholar
  3. 3).
    Egozcue, J., Perkins, E.M. and Hagemenas, F.: The chromosomes of Saguinus fuscicollis illigeri (Pucheran, 1845) and Aotus trivirgatus (Humboldt, 1811). Folia primatol. 10:154, 1969.PubMedCrossRefGoogle Scholar
  4. 4).
    Egozcue, J.: Primates. In Comparative Mammalian Cytogenetics. (Benirschke, K., ed.), Springer-Verlag, New York, 1969.Google Scholar
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    Chiarelli, B. and Barberis, L.: Some data on the chromosomes of prosimiae and of new world monkeys. Mammalian Chromosomes Newsletter No. 22, 216, 1966.Google Scholar

Copyright information

© Springer Science+Business Media New York 1971

Authors and Affiliations

  • T. C. Hsu
    • 1
  • Kurt Benirschke
    • 2
  1. 1.Section of Cytology, Department of BiologyThe University of Texas M. D. Anderson Hospital and Tumor InstituteHoustonUSA
  2. 2.Department of Obstetrics & Gynecology, School of MedicineUniversity of CaliforniaSan Diego, La JollaUSA

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