Classification of Osborn 1923

Fm. †Psittacosauridae Osborn 1923
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Subfm. †Protiguanodontinae Osborn 1923
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G. †Protiguanodon Osborn 1923
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G. †Psittacosaurus Osborn 1923
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Infraor. †Iguanodontia Baur 1891
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Fm. †Iguanodontidae Bonaparte 1850 [iguanodontid]
Fm. †Laosauridae Marsh 1895
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G. †Dryosaurus Marsh 1894
G. †Laosaurus Marsh 1878
G. †Nanosaurus Marsh 1877
Fm. †Trachodontidae Lydekker 1888