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. †Chasmosaurus Lambe 1914
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†Chasmosaurus belli Lambe 1902
†Chasmosaurus brevirostris Lull 1933
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