Classification of Stirton 1939

G. †Borophagus Cope 1892
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†Borophagus pachyodon Merriam 1903
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Invalid names: Porthocyon dubius Merriam 1903 [synonym]
Invalid names: Hyaenognathus Merriam 1903 [synonym], Porthocyon Merriam 1903 [synonym]
G. †Eucastor Allen 1877
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†Eucastor lecontei Merriam 1896
Invalid names: Sigmogomphius Merriam 1896 [synonym]
G. †Pediomeryx Stirton 1936
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†Pediomeryx ruminalis Stirton 1939
G. †Tetrameryx Lull 1921
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†Tetrameryx irvingtonensis Stirton 1939
G. †Neohipparion Gidley 1903
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†Neohipparion gidleyi Merriam 1915
G. †Osteoborus Stirton and VanderHoof 1933
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†Osteoborus pugnator Cook 1922
G. †Trilophodon Falconer 1857
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†Trilophodon simpsoni Stirton 1939