Classification of Kelly 1994

†Equus idahoensis Merriam 1918
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G. †Satherium Gazin 1934
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†Satherium ingens Gazin 1934
G. Spermophilus Cuvier 1825 [ground squirrel]
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†Spermophilus howelli Hibbard 1941
G. Thomomys Wied-Neuwied 1839
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†Thomomys carsonensis Kelly 1994
G. †Gigantocamelus Barbour and Schultz 1939
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G. †Hemiauchenia Gervais and Ameghino 1880
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G. Equus Linnaeus 1758 [horse]
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†Equus giganteus Gidley 1901
G. †Mammut Blumenbach 1799 [mastodon]
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†Mammut americanum Kerr 1792 [American mastodon]
†Equus simplicidens Cope 1892
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Invalid names: Plesippus shoshonensis Gidley 1930 [synonym]