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Tytthaena parrisi, Oldest Known Oxyaenid (Mammalia, Creodonta) from the Late Paleocene of Western North America

Philip D. Gingerich
Journal of Paleontology
Vol. 54, No. 3 (May, 1980), pp. 570-576
Stable URL: http://www.jstor.org/stable/1304200
Page Count: 7
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Tytthaena parrisi, Oldest Known Oxyaenid (Mammalia, Creodonta) from the Late Paleocene of Western North America
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Abstract

A new genus and species of Oxyaenidae, Tytthaena parrisi from the middle Tiffanian Cedar Point Quarry in northwestern Wyoming, is the oldest known member of this family. Tytthaena is approximately 20% smaller than any previously described oxyaenid. Morphologically it resembles late Tiffanian Oxyaena and Dipsalodon more closely than any other Paleocene genus. The early appearance of Tytthaena and the broad radiation of Oxyaenidae in North America suggest that this family is of North American or possibly Central American origin. Derivation from a palaeoryctid such as late Cretaceous Cimolestes, as others have suggested, is plausible but not yet well substantiated.

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