Classification of Hough 1955

Or. Perissodactyla Owen 1848 [odd-toed ungulate]
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Superfm. †Chalicotherioidea Gill 1872
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Fm. †Chalicotheriidae Gill 1872 [chalicothere]
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Subfm. †Eomoropinae Matthew 1929
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G. †Schizotheriodes Hough 1955
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Schizotheriodes parvus Hough 1955
Fm. †Helaletidae Osborn 1892
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G. †Desmatotherium Scott 1883
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Desmatotherium kayi Hough 1955
G. †Dilophodon Scott 1883
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Dilophodon leotanus Peterson 1932
Invalid names: Heteraletes Peterson 1931 [synonym]
Superfm. Rhinocerotoidea Gray 1821
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Fm. †Amynodontidae Scott and Osborn 1883
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G. †Amynodontopsis Stock 1933