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abstract
The current study presents a description of new small-bodied omomyid specimens from the early Eocene of the Washakie Basin, Wyoming, discussed here as a part of a broader study of the Eocene primates Tetonoides pearcei and Anemorhysis savagei. Specimens studied date to the Late Graybullian and Lysitean faunal zones of the Wasatchian North American Land Mammal Age, and represent previously described and recently recovered specimens. Among the new materials are several multi-toothed jaw specimens from the Bitter Creek area of the Washakie Basin. Metric and morphologic data for the overall sample, including these new specimens, were analyzed for each individual species, and as a combined data set. Despite being from two distinct faunal zones (Late Graybullian and Lysitean for T. pearcei and A. savagei respectively), the amount of metric variation for the combined sample, seen for example in the lengths of M, (CV = 2.8, n = 26) and M, (CV = 3.5, n = 25), is consistent with the amount of variation seen in single species samples of extant small bodied primates and is less than that exhibited in many small-bodied primate generic samples, both extant and extinct. Despite some subtle differences, there is a consistent overall morphologic pattern seen throughout the combined sample, which is not unexpected, as these two forms exhibit similar adaptive-profiles. Therefore, the data presented here suggest that, in contrast to a number of previous reports, a generic distinction between T. pearcei and A. savagei is not supported. Rather, Tetonoides is viewed here as a junior synonym of Anemorhysis, in agreement with Bown and Rose (1984, 1987), and Gunnell and Rose (2002), following Szalay (1976, 1982).
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