Classification of the genus Pseudhipparion

G. †Pseudhipparion Ameghino 1904
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Pseudhipparion gratum Leidy 1869
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Invalid names: Neohipparion niobrarense Gidley 1906 [synonym]
Pseudhipparion hessei Webb and Hulbert, Jr. 1986
Pseudhipparion simpsoni Webb and Hulbert, Jr. 1986
Pseudhipparion skinneri Webb and Hulbert, Jr. 1986
Invalid names: Griphippus Quinn 1955 [synonym]