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Phylogeny of Middle Eocene Adapidae (Mammalia, Primates) in North America: Smilodectes and Notharctus

Philip D. Gingerich
Journal of Paleontology
Vol. 53, No. 1 (Jan., 1979), pp. 153-163
Stable URL: http://www.jstor.org/stable/1304044
Page Count: 11
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Phylogeny of Middle Eocene Adapidae (Mammalia, Primates) in North America: Smilodectes and Notharctus
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Abstract

Stratigraphic study of all of the major collections of middle Eocene Adapidae from North America indicates that at least six species are known. Two new species, Smilodectes mcgrewi and Notharctus robinsoni, are described from lower Bridgerian beds (Bridger A). Three species are recognized in the middle Bridgerian (Bridger B): Smilodectes gracilis, Notharctus tenebrosus, and N. pugnax. Notharctus robustior is the only common species of Adapidae in the upper Bridgerian (Bridger C and D), although smaller species of both Smilodectes and Notharctus appear to be represented as well. Notharctus robustior may have survived into the early part of the late Eocene (early Uintan), but the Notharctinae apparently then became extinct in North America. Mahgarita stevensi from the late Eocene of Texas appears to be an immigrant from Eurasia, indicating that a new radiation of Adapidae reoccupied part of North America in the late Eocene.

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