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Earliest Eocene Miacidae (Mammalia: Carnivora) from northwestern Wyoming

Published online by Cambridge University Press: 20 May 2016

Ronald E. Heinrich
Affiliation:
1reheinrich@gmail.com
Suzanne G. Strait
Affiliation:
2Department of Biological Sciences, Marshall University, Huntington, West Virginia 25755
Peter Houde
Affiliation:
3Department of Biology, New Mexico State University, Las Cruces 88003

Abstract

Fossil carnivorans are described from earliest Eocene localities in the Clarks Fork and southern Bighorn basins of Wyoming. Three new species,Miacis rosei, Uintacyon gingerichi, andVassacyon bowni, collected from the base of the Wasatchian North American Land Mammal Age (Wa-0), are the smallest and possibly most basal members of their respective genera, and increase from one to four the number of miacids known from this faunal zone. An upper dentition ofMiacis deutschi from slightly younger (Wa-2) deposits is also described. Previously known only from lower teeth and a single M1, the specimen ofM. deutschi includes the left P3-M2, alveoli for the canine, first two premolars and the last molar, as well as most of the maxilla. the new material helps fill gaps in our knowledge of the dental morphology of basal Miacidae and provides insight into the functional differences of the carnassial teeth in the divergingUintacyon andMiacis lineages. It also provides an opportunity to further assess the hypothesis that climactic warming in the earliest Eocene resulted in evolutionary dwarfing of mammalian species; based on three criteria for identifying dwarfed species at least one of the new taxa,U. gingerichi, is consistent with this hypothesis.

Type
Research Article
Copyright
Copyright © The Paleontological Society 

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