Classification of Lehman 1990
G. †Ceratops Marsh 1888
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G. †Ugrosaurus CoBabe and Fastovsky 1987
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Fm. †Ceratopsidae Marsh 1888 [ceratopsid]
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Subfm. †Centrosaurinae Lambe 1915
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G. †Centrosaurus Lambe 1905
G. †Monoclonius Cope 1876
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Invalid names: Avaceratops Dodson 1986 [synonym], Brachyceratops Gilmore 1914 [synonym]
G. †Pachyrhinosaurus Sternberg 1950
G. †Styracosaurus Lambe 1913
Subfm. †Chasmosaurinae Lambe 1915
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G. †Anchiceratops Brown 1914
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†Anchiceratops ornatus Brown 1914
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Invalid names: Anchiceratops longirostris Sternberg 1926 [synonym]
G. †Chasmosaurus Lambe 1914
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†Chasmosaurus belli Lambe 1902
†Chasmosaurus mariscalensis Lehman 1989
†Chasmosaurus russelli Sternberg 1940
Invalid names: Eoceratops Lambe 1915 [synonym]
G. †Pentaceratops Osborn 1923
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†Pentaceratops sternbergii Osborn 1923
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Invalid names: Pentaceratops fenestratus Wiman 1930 [synonym]
G. †Torosaurus Marsh 1891
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†Torosaurus latus Marsh 1891
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Invalid names: Torosaurus gladius Marsh 1891 [synonym], Torosaurus utahensis Gilmore 1946 [synonym]
G. †Triceratops Marsh 1889
†Triceratops horridus Marsh 1889
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Invalid names: Triceratops brevicornus Hatcher and Lull 1905 [synonym], Triceratops calicornis Marsh 1898 [synonym], Triceratops elatus Marsh 1891 [synonym], Triceratops flabellatus Marsh 1889 [synonym], Triceratops hatcheri Lull 1905 [synonym], Triceratops obtusus Marsh 1898 [synonym], Triceratops prorsus Marsh 1890 [synonym]