Classification of Sampson et al. 2010

Subfm. †Chasmosaurinae Lambe 1915
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G. †Kosmoceratops Sampson et al. 2010
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†Kosmoceratops richardsoni Sampson et al. 2010
G. †Utahceratops Sampson et al. 2010
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†Utahceratops gettyi Sampson et al. 2010
G. †Vagaceratops Sampson 2010
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†Vagaceratops irvinensis Holmes et al. 2001