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Mary R. Dawson
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Book Chapter
Machaeroides simpsoni , new species, oldest known sabertooth creodont (Mammalia), of the Lost Cabin Eocene
Series: Contributions to Geology Special Paper 3
Publisher: University of Wyoming
Published: 01 January 1986
DOI: 10.2113/gsrocky.24.special_paper_3.177
EISBN: 9780989762625
Abstract A new species of machaeroidine creodont, Machaeroides simpsoni , is described from the Lostcabinian and Gardnerbuttean of the Wind River Formation, Natrona County, Wyoming. The sabertooth adaptation is fully developed in this species, which has a combination both of more primitive characters and a more derived sabertooth condition than in the Bridgerian species, M. eothen . Some morphological features of Machaeroides indicate that the machaeroidines are more closely allied with the oxyaenids than with the limnocyonids.