Classification of Lull 1906
Fm. †Ceratopsidae Marsh 1888 [ceratopsid]
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Fm. †Agathaumidae Cope 1889
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G. †Agathaumas Cope 1872
G. †Centrosaurus Lambe 1905
G. †Diceratops Hatcher and Lull 1905
G. †Monoclonius Cope 1876
G. †Proceratops Lull 1906
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†Proceratops montanus Marsh 1888
Invalid names: Ceratops Marsh 1888 [replaced]
G. †Torosaurus Marsh 1891
G. †Triceratops Marsh 1889