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The Eocene mammals from the Lysite member, Wind River Formation of Wyoming

1954; Cambridge University Press; Volume: 28; Issue: 3 Linguagem: Inglês

1937-2337

D.R. Kelley, Albert Elmer Wood,

Animal Ecology and Behavior Studies

Revision of the mammals from the type area of the lower Eocene Lysite is possible on the basis of three collections in the Amherst Museum. Addi- tions to the known fauna include the rodent, Leptotomus; the creodonts Thryptaco- don, Anacodon and Prolimnocyon; the uintathere, Probathyopsis; the pantodont, Coryphodon; and the artiodactyl, Diacodexis. Sufficient material is at hand to per- mit a statistical analysis of two genera, Hyopsodus and Hyracotherium, which shows that the morphologic characters heretofore used to characterize species are generally individual variants, and that not more than three species of Hyopsodus and two of Hyracotherium are present. Two new species are described: Thryptacodon loisi and Probathyopsis lysitensis.