Classification of Breithaupt 1999

G. †Troodon Leidy 1856
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†Troodon formosus Leidy 1856
G. †Aublysodon Leidy 1868
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†Aublysodon mirandus Leidy 1868
G. †Dystrophaeus Cope 1877
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G. †Claosaurus Marsh 1890
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†Claosaurus agilis Marsh 1872
G. †Pachycephalosaurus Brown and Schlaikjer 1943
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Invalid names: Tylosteus ornatus Leidy 1872 [synonym]
G. †Palaeoscincus Leidy 1856
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Invalid names: Palaeoscincus costatus Leidy 1856 [nomen dubium]
Subor. †Ceratopsia Marsh 1890 [ceratopsian]
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Invalid names: Polyonax Cope 1874 [nomen dubium]
G. †Thespesius Leidy 1856
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Invalid names: Thespesius occidentalis Leidy 1856 [nomen dubium]