Classification of Brown 1917

Subor. †Ceratopsia Marsh 1890 [ceratopsian]
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G. †Monoclonius Cope 1876
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†Monoclonius crassus Cope 1876
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Invalid names: Monoclonius sphenocerus Cope 1889 [synonym]
†Monoclonius cutleri Brown 1917
†Monoclonius flexus Brown 1914
†Monoclonius nasicornus Brown 1917