Classification of Norman et al. 2004
Subor. †Ornithopoda Marsh 1881 [ornithopod]
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Unr. †Euornithopoda Sereno 1986
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G. †Atlascopcosaurus Rich and Vickers-Rich 1989
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†Atlascopcosaurus loadsi Rich and Vickers-Rich 1989
G. †Bugenasaura Galton 1995
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G. †Leaellynasaura Rich and Vickers-Rich 1989
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†Leaellynasaura amicagraphica Rich and Vickers-Rich 1989
G. †Othnielia Galton 1977
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†Othnielia rex Marsh 1877
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Invalid names: Laosaurus consors Marsh 1894 [synonym], Laosaurus gracilis Marsh 1878 [synonym]
G. †Thescelosaurus Gilmore 1913
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†Thescelosaurus neglectus Gilmore 1913
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Invalid names: Thescelosaurus edmontonensis Sternberg 1940 [synonym]
Fm. †Heterodontosauridae Romer 1966 [heterodontosaurid]
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Invalid names: Dianchungosaurus Young 1982 [nomen dubium], Dianchungosaurus lufengensis Young 1982 [nomen dubium], Geranosaurus Broom 1911 [nomen dubium], Geranosaurus atavus Broom 1911 [nomen dubium], Hypsilophodon wielandi Galton and Jensen 1979 [nomen dubium], Laosaurus Marsh 1878 [nomen dubium], Laosaurus celer Marsh 1878 [nomen dubium], Laosaurus minimus Gilmore 1924 [nomen dubium], Nanosaurus Marsh 1877 [nomen dubium], Nanosaurus agilis Marsh 1877 [nomen dubium], Phyllodon Thulborn 1975 [nomen dubium], Siluosaurus Dong 1997 [nomen dubium]