Karyotypic evolution in Aotus

Gary J. Galbreath*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

24 Scopus citations


Great karyotypic diversity exists within the platyrrhine genus Aotus. Primarily by comparing banded karyograms of different forms of Aotus, the pattern of karyotypic evolution can be assessed. Out‐group comparisons are used to establish primitive and derived states of particular chromosomes, and a parsimonious cladogram is constructed. Other karyotypic changes are then positioned at appropriate nodes of the cladogram. The resulting phylogenetic hypothesis is entirely self‐consistent, is in accord with out‐group comparisons, does not invoke hybridization between ancestral forms, and, importantly, indicates a single origin for each rearrangement of euchromatic segments. Moreover, it is consistent with the hypothesis, derived from pelage studies, that the more southerly Aotus taxa constitute a holophyletic group. The reconstructed ancestral karyotype had a diploid number of 54. There has been little loss of euchromatic material during Aotus evolution.

Original languageEnglish (US)
Pages (from-to)245-251
Number of pages7
JournalAmerican journal of primatology
Issue number3
StatePublished - 1983


  • Aotus
  • Platyrrhini
  • cladistics
  • euchromatin
  • evolution
  • genetic drift
  • heterosis
  • karyotype
  • mammalogy
  • night monkey
  • phylogeny

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Animal Science and Zoology


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