Classification of the species Hippotherium isonesum
†Acritohippus isonesus Cope 1889
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†Merychippus isonesus quartus Osborn 1918
†Merychippus isonesus quintus Osborn 1918
Invalid names: Merychippus praecocidens Russell 1933 [synonym]
†Merychippus isonesus tertius Osborn 1918
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