Classification of Hibbard 1955
Fm. Mustelidae Fischer 1817 [mustelid carnivore]
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Fm. Ursidae Gray 1825 [bear]
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G. †Tremarctotherium Kraglievich 1926
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†Tremarctotherium simum Cope 1879 [giant short-faced bear]
G. Onychomys Baird 1858 [grasshopper mouse]
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†Onychomys jinglebobensis Hibbard 1955
Fm. Elephantidae Gray 1821 [elephant]
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G. †Paramylodon Brown 1903
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†Paramylodon harlani Owen 1840 [Harlan's ground sloth]
Subg. †Microtus (Pedomys) Baird 1858
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Microtus (Pedomys) ochrogaster Wagner 1842 [prairie vole]