Classification of Dodson 1990

†Monoclonius fissus Cope 1889
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†Monoclonius cutleri Brown 1917
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Fm. †Ceratopsidae Marsh 1888 [ceratopsid]
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Invalid names: Ceratops Marsh 1888 [nomen dubium]
Subfm. †Centrosaurinae Lambe 1915
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G. †Avaceratops Dodson 1986
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†Avaceratops lammersi Dodson 1986
G. †Brachyceratops Gilmore 1914
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G. †Centrosaurus Lambe 1905
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†Centrosaurus apertus Lambe 1905
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Invalid names: Centrosaurus flexus Brown 1914 [synonym], Centrosaurus longirostris Sternberg 1940 [synonym], Monoclonius dawsoni Lambe 1902 [synonym]
G. †Monoclonius Cope 1876
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†Monoclonius crassus Cope 1876
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Invalid names: Monoclonius lowei Sternberg 1940 [synonym]
G. †Pachyrhinosaurus Sternberg 1950
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†Pachyrhinosaurus canadensis Sternberg 1950
G. †Styracosaurus Lambe 1913
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Invalid names: Monoclonius nasicornus Brown 1917 [synonym]