Classification of Douglass 1908
G. †Merychippus Leidy 1856
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†Merychippus insignis Leidy 1856
†Merychippus missouriensis Douglass 1908
G. †Mesohippus Marsh 1875
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†Mesohippus bairdi Leidy 1850
†Mesohippus brachystylus Osborn 1904
†Mesohippus hypostylus Osborn 1904
†Mesohippus portentus Douglass 1908