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Climbing Adaptations in the Early Eocene Mammal Chriacus and the Origin of Artiodactyla
Kenneth D. Rose
New Series, Vol. 236, No. 4799 (Apr. 17, 1987), pp. 314-316
Published by: American Association for the Advancement of Science
Stable URL: http://www.jstor.org/stable/1698647
Page Count: 3
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A virtually complete articulated skeleton of the arctocyonid Chriacus, recently found in northern Wyoming, is one of the most intact early Eocene mammal skeletons ever found. It exhibits numerous adaptations characteristic of mammals that climb, including strong bony crests and processes (reflecting powerful musculature), ability for considerable forearm supination, a highly mobile ankle joint, plantigrade feet, curved and transversely compressed claws, and a long, possibly semiprehensile tail. These features contrast sharply with those of the oldest artiodactyls and indicate that Chriacus or a similar arctocyonid was not ancestral to the Artiodactyla, as has been proposed.
Science © 1987 American Association for the Advancement of Science