Classification of Gregory 1942
G. †Megantereon Croizet and Jobert 1828
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†Megantereon osborni Merriam 1919
†Megantereon whitfordi Barbour and Cook 1915
G. Vulpes Frisch 1775 [fox]
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†Vulpes shermanensis Hibbard 1937
Invalid names: Leptocyon Matthew 1918 [synonym]
G. †Procamelus Leidy 1858
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†Procamelus vulcanorus Cope 1875
Invalid names: Procamelus edensis Frick 1921 [nomen vanum]
Fm. Antilocapridae Gray 1866 [pronghorn]
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G. †Merycodus Leidy 1854
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†Merycodus warreni Leidy 1858
Invalid names: Cosoryx Leidy 1869 [synonym], Meryceros Frick 1937 [synonym], Ramoceros Frick 1937 [synonym]
Fm. Equidae Gray 1821 [horse]
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G. †Neohipparion Gidley 1903
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†Neohipparion occidentale Leidy 1856
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Invalid names: Hipparion affine Leidy 1869 [synonym], Hipparion dolichops Gidley 1906 [synonym]
†Neohipparion whitneyi Gidley 1903
G. †Metoreodon Matthew and Cook 1909
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†Metoreodon profectus Matthew and Cook 1909
†Pliohippus supremus Leidy 1869
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Invalid names: Pliohippus robustus Marsh 1874 [synonym]
†Pliohippus tantalus Merriam 1913
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Invalid names: Pliohippus fairbanksi Merriam 1915 [synonym]
Tr. Lamini Webb 1965
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Invalid names: Procamelus edensis raki Frick 1921 [nomen vanum]