Classification of Hay 1924
G. †Aelurodon Leidy 1858
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†Aelurodon francisi Hay 1924
†Aelurodon simulans Hay 1924
G. †Procamelus Leidy 1858
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†Procamelus benedentatus Hay 1924
†Procamelus concerptus Hay 1924
G. †Dromomeryx Douglass 1909
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†Dromomeryx angustidens Hay 1924
†Dromomeryx texanus Hay 1924
G. †Merychippus Leidy 1856
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†Merychippus francisi Hay 1924
†Merychippus socius Hay 1924
†Merychippus vellicans Hay 1924
G. †Miohippus Marsh 1874
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†Miohippus blackbergi Hay 1924
†Miohippus navasotae Hay 1924