Classification of Lull and Gray 1949

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 cerorhynchus Brown and Schlaikjer 1942
G. †Arrhinoceratops Parks 1925
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G. †Chasmosaurus Lambe 1914
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Chasmosaurus belli Lambe 1902
G. †Monoclonius Cope 1876
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Monoclonius flexus Brown 1914
G. †Pentaceratops Osborn 1923
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G. †Torosaurus Marsh 1891
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Torosaurus gladius Marsh 1891
Torosaurus latus Marsh 1891
G. †Triceratops Marsh 1889
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Triceratops calicornis Marsh 1898
Triceratops elatus Marsh 1891
Triceratops horridus Marsh 1889
Triceratops prorsus Marsh 1890