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The earliest fossil evidence for sexual dimorphism in primatesRecently obtained material of the early Eocene primate Notharctus venticolus, including two partial skulls from a single stratigraphic horizon, provides the geologically earliest evidence of sexual dimorphism in canine size and shape in primates and the only unequivocal evidence for such dimorphism in strepsirhines. By analogy with living platyrrhines, these data suggest that Notharctus venticolus may have lived in polygynous social groups characterized by a relatively high level of intermale competition for mates and other limited resources. The anatomy of the upper incisors and related evidence imply that Notharctus is not as closely related to extant lemuriform primates as has been recently proposed. The early Eocene evidence for canine sexual dimorphism reported here, and its occurrence in a nonanthropoid, indicates that in the order Primates such a condition is either primitive or evolved independently more than once.
Document ID
19930043778
Document Type
Reprint (Version printed in journal)
Authors
Krishtalka, Leonard (Carnegie Museum of Natural History Pittsburgh, PA, United States)
Stucky, Richard K. (Denver Museum of Natural History CO, United States)
Beard, K. C. (Carnegie Museum of Natural History Pittsburgh, PA, United States)
Date Acquired
August 16, 2013
Publication Date
July 1, 1990
Publication Information
Publication: National Academy of Sciences, Proceedings
ISSN: 0027-8424
Subject Category
LIFE SCIENCES (GENERAL)
Funding Number(s)
CONTRACT_GRANT: NSF BSR-87-09242
CONTRACT_GRANT: NSF BSR-84-02051
CONTRACT_GRANT: NAGW-949
Distribution Limits
Public
Copyright
Other