Concluding Remarks

  • R. L. Ciochon
  • A. B. Chiarelli
Part of the Advances in Primatology book series (AIPR)


In 1945 George Gaylord Simpson proposed that from data bearing on the present day distribution of the Ceboidea and from aspects of their comparative anatomy there could be little doubt that all the New World monkeys represented a radiation from a single ancestral stock isolated in South America during the early Tertiary. Simpson further suggested that “the most reasonable hypothesis is that ceboids arose from one of the Paleocene or Eocene prosimian stocks of North America and that their early deployment, or indeed almost all of their history, occurred in the more tropical parts of South America, where Tertiary fossils are extremely rare. This is, however, only a hypothesis” (Simpson, 1945, p. 185). Prior to the proposal of this hypothesis, which was certainly a reasonable one at the time, many accounts of platyrrhine origins had been primarily anecdotal in nature. Take, for instance, the proposal of Sera (1938) who concluded that the Platyrrhini had recently evolved from an aquatic ancestor or had passed through an aquatic stage during their more recent evolution based on the form of the platyrrhine nose and laryngeal cartilages, the shape of the external ears, the short auditory passage, the lobulations of the kidney and the structure of the female genital passages.


World Monkey Late Eocene Continental Drift Geographical Source Lower Primate 
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Copyright information

© Plenum Publishing Corporation 1980

Authors and Affiliations

  • R. L. Ciochon
    • 1
  • A. B. Chiarelli
    • 2
  1. 1.Department of Anthropology and SociologyUniversity of North Carolina at CharlotteCharlotteUSA
  2. 2.Istituto di AntropologiaUniversità di FirenzeFirenzeItaly

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