Classification of Ostrom 1980
Or. Archosauria Cope 1869 [archosaur]
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Or. †Ornithischia Seeley 1888 [ornithischian]
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Subor. †Ankylosauria Osborn 1923 [ankylosaur]
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Fm. †Ankylosauridae Brown 1908 [ankylosaurid]
Fm. †Nodosauridae Marsh 1890
Subor. †Ceratopsia Marsh 1890 [ceratopsian]
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Fm. †Ceratopsidae Marsh 1888 [ceratopsid]
Fm. †Protoceratopsidae Granger and Gregory 1923
Subor. †Ornithopoda Marsh 1881 [ornithopod]
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Fm. †Hadrosauridae Cope 1869 [hadrosaurid]
Fm. †Heterodontosauridae Romer 1966 [heterodontosaurid]
Fm. †Hypsilophodontidae Dollo 1882 [hypsilophodontid]
Fm. †Iguanodontidae Bonaparte 1850 [iguanodontid]
Fm. †Pachycephalosauridae Sternberg 1945
Fm. †Psittacosauridae Osborn 1923
Subor. †Stegosauria Marsh 1877
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Fm. †Stegosauridae Marsh 1880
Invalid names: Scelidosauridae Cope 1869 [empty]
Or. Saurischia Seeley 1888 [saurischian]
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Subor. †Sauropodomorpha Huene 1932 [sauropodomorph]
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Infraor. †Prosauropoda Huene 1920 [prosauropod]
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Fm. †Anchisauridae Marsh 1885 [anchisaurid]
Fm. †Plateosauridae Marsh 1895 [plateosaurid]
Invalid names: Melanorosauridae Huene 1929 [empty]
Infraor. †Sauropoda Marsh 1878 [sauropod]
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Fm. †Brachiosauridae Riggs 1904 [brachiosaurid]
Fm. †Titanosauridae Lydekker 1885 [titanosaurid]
Or. Theropoda Marsh 1881 [theropod]
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Infraor. †Carnosauria Huene 1920 [carnosaur]
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Fm. †Megalosauridae Fitzinger 1843
Fm. †Therizinosauridae Maleev 1954
Fm. †Tyrannosauridae Osborn 1906 [tyrannosaurid]
Subor. Coelurosauria Huene 1914 [coelurosaur]
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Fm. †Coeluridae Marsh 1881 [coelurid]
Fm. †Compsognathidae Cope 1871 [compsognathid]
Fm. †Dromaeosauridae Colbert and Russell 1969
Fm. †Ornithomimidae Marsh 1890 [ornithomimid]
Fm. †Oviraptoridae Barsbold 1976
Fm. †Podokesauridae Huene 1914
Invalid names: Segisauridae Camp 1936 [empty]