Classification of Prothero and Ludtke 2007

Or. Artiodactyla Owen 1848 [even-toed ungulate]
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Fm. †Protoceratidae Marsh 1891 [protoceratid]
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G. †Heteromeryx Matthew 1905
G. †Leptoreodon Wortman 1898
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†Leptoreodon golzi Ludtke and Prothero 2004
G. †Leptotragulus Scott and Osborn 1887
G. †Poabromylus Peterson 1932
Subfm. †Protoceratinae
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G. †Paratoceras Frick 1937
G. †Protoceras Marsh 1891
G. †Pseudoprotoceras Cook 1934
Subfm. †Synthetoceratinae Frick 1937
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Tr. †Kyptoceratini Webb 1981
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G. †Kyptoceras Webb 1981
G. †Syndyoceras Barbour 1905
Tr. †Synthetoceratini Webb 1981
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G. †Lambdoceras Stirton 1967
G. †Prosynthetoceras Frick 1937
G. †Synthetoceras Stirton 1932
G. †Toromeryx Wilson 1974
Invalid names: Leptotragulinae [invalid subgroup]