Classification of Hibbard 1955

Fm. Mustelidae Fischer 1817 [mustelid carnivore]
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G. Spilogale Gray 1865
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Spilogale interrupta Rafinesque 1820 [prairie spotted skunk]
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. Zapus Coues 1876
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Zapus adamsi Hibbard 1955
G. Ondatra Link 1795 [muskrat]
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Ondatra zibethica Linnaeus 1766 [muskrat]
G. Onychomys Baird 1858 [grasshopper mouse]
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Onychomys jinglebobensis Hibbard 1955
G. Oryzomys Baird 1857 [rice rat]
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Oryzomys fossilis Hibbard 1955
G. Peromyscus Gloger 1841 [deer mouse]
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Peromyscus cochrani Hibbard 1955
G. †Synaptomys Baird 1858
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Synaptomys australis Simpson 1928
Fm. Elephantidae Gray 1821 [elephant]
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G. †Mammuthus Brookes 1828 [mammoth]
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Mammuthus columbi Falconer 1857 [Columbian mammoth]
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]