Classification of Brown and Schlaikjer 1940

G. †Tyrannosaurus Osborn 1905 [tyrant lizard]
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†Tyrannosaurus rex Osborn 1905 [tyrant lizard king]
G. †Protoceratops Granger and Gregory 1923
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†Protoceratops andrewsi Granger and Gregory 1923
G. †Monoclonius Cope 1876
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†Monoclonius nasicornus Brown 1917
G. †Styracosaurus Lambe 1913
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†Styracosaurus parksi Brown and Schlaikjer 1937
G. †Triceratops Marsh 1889
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†Triceratops serratus Marsh 1890
†Triceratops sulcatus Marsh 1890