Classification of Ryan and Russell 2005
Fm. †Ceratopsidae Marsh 1888 [ceratopsid]
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Subfm. †Centrosaurinae Lambe 1915
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G. †Achelousaurus Sampson 1994
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], Monoclonius nasicornus Brown 1917 [synonym]
†Centrosaurus brinkmani Ryan and Russell 2005
G. †Einiosaurus Sampson 1994
G. †Styracosaurus Lambe 1913
Subfm. †Chasmosaurinae Lambe 1915