Classification of Godfrey and Holmes 1995
Fm. †Ceratopsidae Marsh 1888 [ceratopsid]
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Subfm. †Chasmosaurinae Lambe 1915
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G. †Chasmosaurus Lambe 1914
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†Chasmosaurus belli Lambe 1902
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Invalid names: Chasmosaurus brevirostris Lull 1933 [synonym], Chasmosaurus canadensis Lambe 1902 [synonym], Chasmosaurus kaiseni Brown 1933 [synonym]
†Chasmosaurus russelli Sternberg 1940