Classification of Johnston 1937

Fm. Equidae Gray 1821 [horse]
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G. †Calippus Matthew and Stirton 1930
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Calippus placidus Leidy 1869
Calippus regulus Johnston 1937
G. †Pliohippus Marsh 1874
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Pliohippus ansae Matthew and Stirton 1930
Pliohippus martini Hesse 1936