Classification of Elftman 1931

G. Canis Linnaeus 1758 [canine]
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†Canis dirus Leidy 1858 [dire wolf]
†Canis lestes Merriam 1897
†Canis occidentalis Richardson 1829
G. Thomomys Wied-Neuwied 1839
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Thomomys townsendi Bachman 1839 [Townsend's pocket gopher]
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Invalid names: Thomomys scudderi Hay 1921 [synonym]
G. Microtus Schrank 1798 [vole]
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Microtus montanus Peale 1848 [montane vole]
G. Lepus Linnaeus 1758 [hare]
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Lepus townsendi Bachman 1839 [white-tailed jackrabbit]
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Invalid names: Lepus campestris Bachman 1837 [synonym]
G. †Platygonus Leconte 1848
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†Platygonus vetus Leidy 1882
G. †Camelops Leidy 1854
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†Camelops hesternus Leidy 1873
†Camelops maximus Hay 1921
G. Antilocapra Ord 1818 [pronghorn]
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Antilocapra americana Ord 1815 [pronghorn]
G. Equus Linnaeus 1758 [horse]
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†Equus pacificus Leidy 1868
G. Elephas Linnaeus 1758 [elephant]
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†Elephas columbi Falconer 1857 [Columbian mammoth]
G. †Mylodon Owen 1859
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†Mylodon harlani Owen 1840 [Harlan's ground sloth]
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Invalid names: Mylodon sodalis Cope 1878 [synonym]
G. †Eschatius Cope 1884
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†Eschatius conidens Cope 1884
Invalid names: Eschatius longirostris Cope 1884 [nomen dubium]
G. †Fiber
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†Fiber oregonus Hollister 1911
G. †Tanupolama Stock 1928
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Invalid names: Auchenia vitakeriana Cope 1878 [nomen dubium]