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. †Leptotragulus Scott and Osborn 1887
G. †Poabromylus Peterson 1932
G. †Pseudoprotoceras Cook 1934
Subfm. †Synthetoceratinae Frick 1937
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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]