Classification of Hatcher and Lull 1905

Subor. †Ceratopsia Marsh 1890 [ceratopsian]
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G. †Diceratops Hatcher and Lull 1905
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†Diceratops hatcheri Lull 1905
G. †Triceratops Marsh 1889
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†Triceratops brevicornus Hatcher and Lull 1905