Classification of Osborn and Wortman 1895

Fm. Equidae Gray 1821 [horse]
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Subfm. †Anchitheriinae Leidy 1869 [anchitheriine horse]
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G. †Mesohippus Marsh 1875
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†Mesohippus bairdii Leidy 1850
†Mesohippus copei Osborn and Wortman 1895
†Mesohippus intermedius Osborn and Wortman 1895
G. †Colodon Marsh 1890
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†Colodon dakotensis Osborn and Wortman 1895
†Colodon longipes Osborn and Wortman 1894
†Colodon procuspidatus Osborn and Wortman 1895
G. †Helaletes Marsh 1872
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†Helaletes nanus Marsh 1871
†Aceratherium tridactylum Osborn 1893
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Invalid names: Diceratherium proavitum Hatcher 1894 [synonym]
†Mesohippus bairdi Leidy 1850
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Invalid names: Anchitherium celer Marsh 1874 [synonym], Anchitherium cuneatum Cope 1873 [synonym], Anchitherium exoletum Cope 1874 [synonym]
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G. †Titanotherium Leidy 1852
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†Titanotherium dispar Marsh 1887
†Titanotherium robustum Marsh 1887
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Invalid names: Titanops elatus Marsh 1887 [synonym]
†Titanotherium validum Marsh 1891
Invalid names: Brontops Marsh 1887 [synonym]