Classification of Maidment and Barrett 2011

G. †Psittacosaurus Osborn 1923
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G. †Protoceratops Granger and Gregory 1923
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Protoceratops andrewsi Granger and Gregory 1923
G. †Leptoceratops Brown 1914
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Leptoceratops gracilis Brown 1914
Fm. †Ceratopsidae Marsh 1888 [ceratopsid]
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Subfm. †Chasmosaurinae Lambe 1915
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G. †Agujaceratops Lucas et al. 2006 [Aguja horned face]
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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 kaiseni Brown 1933 [synonym], Monoclonius canadensis Lambe 1902 [synonym]
Chasmosaurus russelli Sternberg 1940
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Invalid names: Mojoceratops perifania Longrich 2010 [synonym]
Invalid names: Mojoceratops Longrich 2010 [synonym]
G. †Coahuilaceratops Loewen et al. 2010
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Coahuilaceratops magnacuerna Loewen et al. 2010
G. †Kosmoceratops Sampson et al. 2010
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Kosmoceratops richardsoni Sampson et al. 2010
G. †Medusaceratops Ryan et al. 2010
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Medusaceratops lokii Ryan et al. 2010
G. †Ojoceratops Sullivan and Lucas 2010
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Ojoceratops fowleri Sullivan and Lucas 2010
G. †Tatankaceratops Ott and Larson 2010
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Tatankaceratops sacrisonorum Ott and Larson 2010
G. †Titanoceratops Longrich 2011
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Titanoceratops ouranos Longrich 2011
G. †Triceratops Marsh 1889
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Triceratops prorsus Marsh 1890
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
Subfm. †Centrosaurinae Lambe 1915
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G. †Centrosaurus Lambe 1905
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Centrosaurus apertus Lambe 1905
G. †Styracosaurus Lambe 1913
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G. †Archaeoceratops Dong and Azuma 1997
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Archaeoceratops oshimai Dong and Azuma 1997
G. †Yinlong Xu et al. 2006
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Yinlong downsi Xu et al. 2006