Classification of Stirton 1933

G. †Merychippus Leidy 1856
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†Merychippus perditus Leidy 1858
†Merychippus sejunctus Cope 1874
†Merychippus sumani Merriam 1915
G. †Pliohippus Marsh 1874
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†Pliohippus simus Gidley 1906
G. †Protohippus Leidy 1858
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†Protohippus intermontanus Merriam 1915