Classification of Lull 1910
G. †Triceratops Marsh 1889
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†Triceratops brevicornus Hatcher and Lull 1905
†Triceratops prorsus Marsh 1890
G. †Ceratops Marsh 1888
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†Ceratops monatus Marsh 1888
†Ceratops recurvicornis Cope 1889