Classification of Lull 1912

Subor. †Orthopoda Cope 1866
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Subor. †Ceratopsia Marsh 1890 [ceratopsian]
Subor. †Ornithopoda Marsh 1881 [ornithopod]
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Infraor. †Iguanodontia Baur 1891
Subor. †Stegosauria Marsh 1877
Invalid names: Predentata Marsh 1894 [synonym]