NEW PRIMATE FOSSILS FROM COLHUEHUAPIAN DEPOSITS AT CAIMAN AND SACANANA, CHUBUT PROVINCE, ARGENTINA

John G. Fleagle

Abstract


In 1983 a paleontological expedition from the MACN collected new primate fossils from the Colhuehuapian localities of Gaiman and Sacanana in Chubut, Argentina. Jlle new specimens are the first primates-recovered from these localities in over forty years. The Sacanana fossils are provisionally assigned to Tremacebus harringtoni and the Gaiman specimens are provisionally assigned to Dolichocebus gaimanensis. In dental morphology, both taxa are very primitive compared with extant platyrrhines and the new dental remains from Gaiman correspond very closely to the hypothetical ancestral platyrrhine suggested by co~parative analysis of living New World monkeys. Dental similarities between c[. Dolichocebus and Oligocene anthropoids from Egypt support an African origin for platyrrhine monkeys.

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