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3 results for “Microsyopidae”
FIGURE 3. Microsyopidae from TBM. 1-4 in Mammals from the earliest Uintan (middle Eocene) Turtle Bluff Member, Bridger Formation, southwestern Wyoming, USA, Part 1: Primates and Rodentia
FIGURE 3. Microsyopidae from TBM. 1-4, Uintasorex parvulus: 1, RM1 or 2, SDSNH 110359; 2-3, Rdp4, SDSNH 110358; 4, Lm2, DMNH 75287. 5-7, Microsyops annectans: 5, Rm1, UCM 68541; 6-7, partial dentary with Rm2, UCM 70315. 1-2, 4-6, occlusal views. 3 and 7, labial views. Scale bars equal 1 mm for 1-6 and scale bar for 7 equals 5 mm.
Data from: Dietary shifts in a group of early Eocene euarchontans (Microsyopidae) in association with climatic change
<p>The Microsyopidae, a family of plesiadapiforms known from over 1,500 stratigraphically controlled specimens from the southern Bighorn Basin of Wyoming, span the first three million years of the early Eocene. The early Eocene is characterized by rapid fluctuations in climate during the period represented by this collection of microsyopids, making this an ideal sample to examine how climate influenced early stem primate biology, particularly dietary ecology. An evolving lineage of microsyopine microsyopids is known from before, during, and after Biohorizon A, a faunal turnover event associated with a period of localized cooling. Dental topographic analysis (DTA) quantifies functional aspects of molars such as curvature, complexity, and relief, and covaries with diet in extant taxa. Here, we use DTA to examine microsyopid dietary change over time, particularity in response to this cooling event. Our results suggest that microsyopids had molars that are functionally like extant insectivorous/ omnivorous euarchontans. The earliest occurring species in our sample, <i>Arctodontomys wilsoni,</i> is characterized by molars that became more like modern insectivorous euarchontans over time. During Biohorizon A, <i>A. wilsoni </i>is replaced by <i>A. nuptus, </i>which has molars that are more like those of extant omnivores with a mixed diet including fruit. After the biohorizon event, <i>A. nuptus</i> appears more insectivorous, as is the later occurring <i>Microsyops angustidens, </i>which evolves from <i>A. nuptus. </i>Overall, we provide potential evidence for a causal scenario where local climate change coincided with a dietary transition among microsyopids. Our results have important implications for understanding how diet and climate were prime movers for the evolution of early primates.</p>
Data from: Dietary shifts in a group of early Eocene euarchontans (Microsyopidae) in association with climatic change
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