Classification of Troxell 1921

G. †Ischyromys Leidy 1856
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Invalid names: Gymnoptychus Cope 1873 [synonym]
Fm. †Anthracotheriidae Leidy 1869 [anthracothere]
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G. †Aepinacodon Troxell 1921
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Aepinacodon americanus Leidy 1856
Aepinacodon deflectus Marsh 1890
Aepinacodon rostratus Scott 1894
G. †Heptacodon Marsh 1894
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Heptacodon curtus Marsh 1894
G. †Bothriodon Aymard 1846
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Invalid names: Ancodus Pomel 1848 [synonym], Hyopotamus Leidy 1857 [synonym]
G. †Elomeryx Marsh 1894
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Elomeryx armatus Marsh 1894
Elomeryx brachyrhynchus Osborn and Wortman 1894
Ischyromys typus Leidy 1856
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Invalid names: Gymnoptychus chrysodon Cope 1873 [synonym]
G. †Octacodon Marsh 1894
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Octacodon gibbiceps Marsh 1894
Octacodon karense Osborn and Wortman 1894