Classification of Gazin 1955
Or. Artiodactyla Owen 1848 [even-toed ungulate]
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Fm. †Dichobunidae Gill 1872
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Subfm. †Helohyinae Marsh 1877
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G. †Achaenodon Cope 1873
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†Achaenodon insolens Cope 1873
†Achaenodon robustus Osborn 1883
†Achaenodon uintensis Osborn 1895
Invalid names: Protelotherium Osborn 1895 [synonym]
G. †Helohyus Marsh 1872
Subfm. †Homacodontinae Marsh 1849
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G. †Hylomeryx Peterson 1919
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†Hylomeryx annectens Peterson 1919
†Hylomeryx quadricuspis Peterson 1919
Invalid names: Sphenomeryx Peterson 1919 [synonym]
G. †Pentacemylus Peterson 1932
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†Pentacemylus leotensis Gazin 1955
†Pentacemylus progressus Peterson 1932
Invalid names: Diacodexinae Gazin 1955 [empty]
Fm. †Agriochoeridae Leidy 1869 [agriochoerid]
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G. †Diplobunops Peterson 1919
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†Diplobunops crassus Scott 1945
†Diplobunops matthewi Peterson 1919
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Invalid names: Diplobunops uintensis Peterson 1931 [synonym], Diplobunops ultimus Peterson 1931 [synonym]
†Diplobunops vanhouteni Gazin 1955
G. †Protoreodon Scott and Osborn 1887
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†Protoreodon minor Scott 1899
†Protoreodon paradoxicus Scott 1898
†Protoreodon petersoni Gazin 1955
†Protoreodon primus Peterson 1934
†Protoreodon pumilus Marsh 1875
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Invalid names: Protagriochoerus annectens Scott 1899 [synonym], Protoreodon medius Peterson 1919 [synonym], Protoreodon tardus Scott 1945 [synonym]
Invalid names: Agriotherium Scott 1898 [synonym], Chorotherium Berg 1899 [synonym], Eomeryx Marsh 1894 [synonym], Hyomeryx Marsh 1894 [synonym], Mesagriochoerus Peterson 1934 [synonym], Protagriochoerus Scott 1899 [synonym]
Fm. Camelidae Gray 1821 [camel]
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Fm. †Oromerycidae Gazin 1955
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G. †Protylopus Wortman 1898
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†Protylopus annectens Peterson 1919
†Protylopus petersoni Wortman 1898
†Helohyus lentus Marsh 1871
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Invalid names: Parahyus aberrans Marsh 1894 [synonym]