Classification of Parks 1925
Subor. †Ceratopsia Marsh 1890 [ceratopsian]
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G. †Monoclonius Cope 1876
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†Monoclonius cutleri Brown 1917
†Monoclonius flexus Brown 1914
†Monoclonius nasicornis Brown 1917
G. †Triceratops Marsh 1889
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†Triceratops brevicornis Hatcher and Lull 1905
†Triceratops calicornis Marsh 1898
†Triceratops elatus Marsh 1891
†Triceratops flabellatus Marsh 1889
†Triceratops prorsus Marsh 1890
†Triceratops serratus Marsh 1890