Classification of Dodson et al. 2004

Dysganus encaustus Cope 1876
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Fm. †Ceratopsidae Marsh 1888 [ceratopsid]
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Subfm. †Centrosaurinae Lambe 1915
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G. †Achelousaurus Sampson 1994
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Achelousaurus horneri Sampson 1994
G. †Avaceratops Dodson 1986
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Avaceratops lammersi Dodson 1986
G. †Brachyceratops Gilmore 1914
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G. †Centrosaurus Lambe 1905
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Centrosaurus apertus Lambe 1905
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Invalid names: Centrosaurus longirostris Sternberg 1940 [synonym], Monoclonius cutleri Brown 1917 [synonym], Monoclonius dawsoni Lambe 1902 [synonym], Monoclonius flexus Brown 1914 [synonym]
G. †Einiosaurus Sampson 1994
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G. †Monoclonius Cope 1876
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Monoclonius crassus Cope 1876
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Invalid names: Monoclonius lowei Sternberg 1940 [synonym]
Invalid names: Monoclonius fissus Cope 1889 [nomen dubium], Monoclonius recurvicornis Cope 1889 [nomen dubium], Monoclonius sphenocerus Cope 1889 [nomen dubium]
G. †Pachyrhinosaurus Sternberg 1950
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Pachyrhinosaurus canadensis Sternberg 1950
G. †Styracosaurus Lambe 1913
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Invalid names: Monoclonius nasicornus Brown 1917 [synonym], Styracosaurus parksi Brown and Schlaikjer 1937 [synonym]
Invalid names: Styracosaurus ovatus Gilmore 1930 [nomen dubium]
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. †Arrhinoceratops Parks 1925
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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 irvinensis Holmes et al. 2001
Chasmosaurus russelli Sternberg 1940
Invalid names: Eoceratops Lambe 1915 [synonym], Protorosaurus Lambe 1914 [synonym]
G. †Diceratops Hatcher and Lull 1905
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Diceratops hatcheri Lull 1905
G. †Pentaceratops 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: Arrhinoceratops utahensis Gilmore 1946 [synonym], Torosaurus gladius Marsh 1891 [synonym]
G. †Triceratops Marsh 1889
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Triceratops horridus Marsh 1889
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Invalid names: Triceratops albertensis Sternberg 1949 [synonym], Triceratops brevicornus Hatcher and Lull 1905 [synonym], Triceratops calicornis Marsh 1898 [synonym], Triceratops elatus Marsh 1891 [synonym], Triceratops eurycephalus Schlaikjer 1935 [synonym], Triceratops flabellatus Marsh 1889 [synonym], Triceratops obtusus Marsh 1898 [synonym], Triceratops prorsus Marsh 1890 [synonym], Triceratops serratus Marsh 1890 [synonym]
Invalid names: Triceratops sulcatus Marsh 1890 [nomen dubium]
Invalid names: Agathaumas Cope 1872 [nomen dubium], Bison alticornis Marsh 1887 [nomen dubium], Ceratops Marsh 1888 [nomen dubium], Polyonax Cope 1874 [nomen dubium], Triceratops galeus Marsh 1889 [nomen dubium], Triceratops ingens Lull 1915 [nomen dubium], Triceratops maximus Brown 1933 [nomen dubium], Ugrosaurus CoBabe and Fastovsky 1987 [nomen dubium]
G. †Dysganus Cope 1876
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Invalid names: Dysganus bicarinatus Cope 1876 [nomen dubium], Dysganus haydenianus Cope 1876 [nomen dubium], Dysganus peiganus Cope 1876 [nomen dubium]
Unr. †Ornithischia Seeley 1888 [ornithischian]
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Invalid names: Notoceratops Tapia 1919 [nomen dubium]