Classification of Osborn 1904
Fm. Equidae Gray 1821 [horse]
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Invalid names: Miohippus ultimus Cope 1886 [invalid subgroup]
G. †Hypohippus Leidy 1858
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†Hypohippus australis Leidy 1873
†Hypohippus equinus Scott 1893
G. †Mesohippus Marsh 1875
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†Mesohippus brachylophus Cope 1879
†Mesohippus brachystylus Osborn 1904
†Mesohippus celer Marsh 1874
†Mesohippus equiceps Cope 1878
†Mesohippus eulophus Osborn 1904
†Mesohippus gidleyi Osborn 1904
†Mesohippus hypostylus Osborn 1904
†Mesohippus intermedius Osborn and Wortman 1895
†Mesohippus latidens Douglass 1903
†Mesohippus longicristis Cope 1878
†Mesohippus meteulophus Osborn 1904
†Mesohippus montanensis Osborn 1904
†Mesohippus obliquidens Osborn 1904
†Mesohippus proteulophus Osborn 1904
†Mesohippus validus Osborn 1904
†Mesohippus westoni Cope 1889
Invalid names: Anchitherium exoletum Cope 1874 [nomen dubium]
G. †Miohippus Marsh 1874
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†Miohippus anceps Marsh 1874
†Miohippus annectens Marsh 1874
†Miohippus condoni Leidy 1870
†Miohippus crassicuspis Osborn 1904
G. †Colodon Marsh 1890
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†Colodon copei Osborn and Wortman 1895
†Colodon longipes Osborn and Wortman 1894
G. †Aphelops Owen 1845
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†Aphelops longipes Leidy 1890
†Aphelops planiceps Osborn 1904
†Aphelops profectus Matthew 1899
G. †Metacheiromys Wortman 1903
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†Metacheiromys dasypus Osborn 1904
†Metacheiromys tatusia Osborn 1904
†Teleoceras fossiger Cope 1878
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Invalid names: Rhinoceros proterus Leidy 1885 [synonym]