Classification of Diem and Archibald 2005

Subfm. †Chasmosaurinae Lambe 1915
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G. †Anchiceratops Brown 1914
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†Anchiceratops ornatus Brown 1914
G. †Arrhinoceratops Parks 1925
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G. †Chasmosaurus Lambe 1914
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†Chasmosaurus belli Lambe 1902
†Chasmosaurus irvinensis Holmes et al. 2001
†Chasmosaurus russelli Sternberg 1940
G. †Pentaceratops Osborn 1923
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†Pentaceratops sternbergi Osborn 1923
G. †Torosaurus Marsh 1891
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†Torosaurus latus Marsh 1891
G. †Triceratops Marsh 1889
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†Triceratops horridus Marsh 1889