Classification of Stock 1933
†Rhinoceros hesperius Leidy 1865
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†Rhinoceros pacificus Leidy 1872
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G. †Miohippus Marsh 1874
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†Miohippus intermedius Osborn and Wortman 1895
†Miohippus validus Osborn 1904
G. †Amphicaenopus Wood 1927
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†Amphicaenopus platycephalus Osborn and Wortman 1894
G. †Subhyracodon Wood 1927
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†Subhyracodon copei Osborn 1898
†Subhyracodon kewi Stock 1933
†Subhyracodon occidentalis Leidy 1850
†Subhyracodon tridactylum Osborn 1893
†Subhyracodon trigonodus Osborn and Wortman 1894
†Diceratherium armatum Marsh 1875
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Invalid names: Diceratherium nanum Marsh 1875 [synonym]