Classification of Romer 1956
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. †Acanthopholidae Nopcsa 1902
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G. †Acanthopholis Huxley 1867
G. †Hylaeosaurus Mantell 1833
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Invalid names: Priodontognathus Seeley 1875 [synonym], Regnosaurus Mantell 1848 [synonym]
G. †Onychosaurus Nopcsa 1902
G. †Rhodanosaurus Nopcsa 1929
G. †Struthiosaurus Bunzel 1870
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Invalid names: Crataeomus Seeley 1881 [synonym], Danubiosaurus Bunzel 1871 [synonym], Leipsanosaurus Nopcsa 1918 [synonym], Pleuropeltus Seeley 1881 [synonym]
Fm. †Nodosauridae Marsh 1890
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G. †Anodontosaurus Sternberg 1929
G. †Brachypodosaurus Chakravarti 1934 [heavy foot lizard]
G. †Dyoplosaurus Parks 1924
G. †Edmontonia Sternberg 1928
G. †Euoplocephalus Lambe 1910
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Invalid names: Ankylosaurus Brown 1908 [synonym], Stereocephalus Lambe 1902 [synonym]
G. †Heishansaurus Bohlin 1953
G. †Hierosaurus Wieland 1909
G. †Hoplitosaurus Lucas 1902
G. †Lametasaurus Matley 1924
G. †Loricosaurus Huene 1927
G. †Nodosaurus Marsh 1889
G. †Palaeoscincus Leidy 1856
G. †Panoplosaurus Lambe 1919
G. †Peishansaurus Bohlin 1953
G. †Pinacosaurus Gilmore 1933
G. †Polacanthoides Nopcsa 1928
G. †Polacanthus Fox 1866
G. †Sauroplites Bohlin 1953
G. †Scolosaurus Nopcsa 1928 [thorn lizard]
G. †Stegopelta Williston 1905
G. †Stegosaurides Bohlin 1953
Subor. †Ceratopsia Marsh 1890 [ceratopsian]
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Fm. †Protoceratopsidae Granger and Gregory 1923
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G. †Leptoceratops Brown 1914
G. †Microceratops Bohlin 1953
G. †Montanoceratops Sternberg 1951
G. †Protoceratops Granger and Gregory 1923
Invalid names: Pachyrhinosauridae Sternberg 1950 [empty]
Subor. †Ornithopoda Marsh 1881 [ornithopod]
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Fm. †Hadrosauridae Cope 1869 [hadrosaurid]
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G. †Anatosaurus Lull and Wright 1942
G. †Bactrosaurus Gilmore 1933
G. †Cheneosaurus Lambe 1917
G. †Claorhynchus Cope 1892
G. †Claosaurus Marsh 1890
G. †Corythosaurus Brown 1914
G. †Dysganus Cope 1876
G. †Edmontosaurus Lambe 1917
G. †Hadrosaurus Leidy 1858
G. †Hypacrosaurus Brown 1913
G. †Hypsibema Cope 1869
G. †Jaxartosaurus Riabinin 1937
G. †Mandschurosaurus Riabinin 1930
G. †Nipponosaurus Nagao 1936
G. †Ornithotarsus Cope 1869
G. †Orthomerus Seeley 1883
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Invalid names: Hecatasaurus Brown 1910 [synonym], Limnosaurus Nopcsa 1900 [synonym], Telmatosaurus Nopcsa 1903 [synonym]
G. †Parasaurolophus Parks 1922
G. †Procheneosaurus Matthew 1920
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Invalid names: Didanodon Osborn 1902 [synonym], Tetragonosaurus Parks 1931 [synonym]
G. †Prosaurolophus Brown 1916
G. †Saurolophus Brown 1912
G. †Tanius Wiman 1929
G. †Thespesius Leidy 1856
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Invalid names: Cionodon Cope 1874 [synonym], Diclonius Cope 1876 [synonym], Pteropelyx Cope 1889 [synonym]
G. †Trachodon Leidy 1856
Invalid names: Trachodontidae Lydekker 1888 [synonym]
Fm. †Hypsilophodontidae Dollo 1882 [hypsilophodontid]
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G. †Dysalotosaurus Virchow 1919
G. †Geranosaurus Broom 1911
G. †Hypsilophodon Huxley 1870
G. †Nanosaurus Marsh 1877
G. †Parksosaurus Sternberg 1937
G. †Thescelosaurus Gilmore 1913
Fm. †Iguanodontidae Bonaparte 1850 [iguanodontid]
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G. †Camptosaurus Marsh 1885
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Invalid names: Camptonotus Marsh 1879 [synonym], Cumnoria Seeley 1888 [synonym]
G. †Craspedodon Dollo 1883
G. †Iguanodon Mantell 1825
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Invalid names: Iguanosaurus Anonymous 1824 [synonym], Sphenospondylus Seeley 1883 [synonym], Therosaurus Fitzinger 1843 [synonym]
G. †Kangnasaurus Haughton 1915
G. †Sanpasaurus Young 1944
G. †Vectisaurus Hulke 1879
Fm. †Pachycephalosauridae Sternberg 1945
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G. †Pachycephalosaurus Brown and Schlaikjer 1943
G. †Stegoceras Lambe 1902
Invalid names: Troodontidae Gilmore 1924 [synonym]
Fm. †Psittacosauridae Osborn 1923
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G. †Protiguanodon Osborn 1923
G. †Psittacosaurus Osborn 1923
G. †Stenopelix Meyer 1857
Subor. †Stegosauria Marsh 1877
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Fm. †Stegosauridae Marsh 1880
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Invalid names: Scelidosaurinae Nopcsa 1923 [empty], Stegosaurinae Nopcsa 1917 [empty]
Or. Saurischia Seeley 1888 [saurischian]
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Infraor. †Sauropoda Marsh 1878 [sauropod]
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G. †Asiatosaurus Osborn 1924
G. †Austrosaurus Longman 1933
Fm. †Brachiosauridae Riggs 1904 [brachiosaurid]
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Subfm. †Cetiosaurinae Lydekker 1888 [cetiosaurid]
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G. †Amygdalodon Cabrera 1947
G. †Cetiosaurus Owen 1841
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Invalid names: Cardiodon Owen 1841 [synonym], Cetiosauriscus Huene 1927 [synonym]
G. †Dystrophaeus Cope 1877
G. †Elosaurus Peterson and Gilmore 1902
G. †Rhoetosaurus Longman 1926
Invalid names: Brachiosaurinae Huene 1927 [empty], Camarasaurinae Nopcsa 1928 [empty], Euhelopodinae Romer 1956 [empty]
G. †Caulodon Cope 1877
G. †Epanterias Cope 1878
G. †Microcoelus Lydekker 1893
G. †Mongolosaurus Gilmore 1933
G. †Symphyrophus Cope 1878
Fm. †Titanosauridae Lydekker 1885 [titanosaurid]
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Subfm. †Apatosaurinae Janensch 1929
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G. †Apatosaurus Marsh 1877
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Invalid names: Atlantosaurus Marsh 1877 [synonym], Brontosaurus Marsh 1879 [synonym]
G. †Uintasaurus Holland 1919
Subfm. †Diplodocinae Janensch 1929 [diplodocine]
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G. †Amphicoelias Cope 1877
G. †Barosaurus Marsh 1890
G. †Diplodocus Marsh 1878
Invalid names: Dicraeosaurinae Janensch 1929 [empty], Titanosaurinae Lydekker 1893 [empty]
Invalid names: Cetiosauria Seeley 1874 [synonym], Opisthocoelia Owen 1859 [synonym]
Or. Theropoda Marsh 1881 [theropod]
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Infraor. †Carnosauria Huene 1920 [carnosaur]
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Fm. †Megalosauridae Fitzinger 1843
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G. †Acrocanthosaurus Stovall and Langston, Jr. 1950
G. †Antrodemus Leidy 1873
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Invalid names: Allosaurus Marsh 1877 [synonym], Creosaurus Marsh 1878 [synonym], Labrosaurus Marsh 1879 [synonym]
G. †Bahariasaurus Stromer 1934
G. †Carcharodontosaurus Stromer 1931
G. †Ceratosaurus Marsh 1884
G. †Chienkosaurus Young 1942
G. †Dryptosauroides Huene 1933
G. †Dryptosaurus Marsh 1877
G. †Embasaurus Riabinin 1931
G. †Erectopus Huene 1923
G. †Macrodontophion Zborzewski 1834
G. †Megalosaurus Parkinson 1822
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Invalid names: Aggiosaurus Ambayrac 1913 [synonym], Altispinax Huene 1923 [synonym], Iliosuchus Huene 1932 [synonym], Magnosaurus Huene 1932 [synonym], Nuthetes Owen 1854 [synonym], Poecilopleurum Eudes-Deslongchamps 1837 [synonym], Proceratosaurus Huene 1926 [synonym]
G. †Orthogoniosaurus Das-Gupta 1930
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Invalid names: Indosaurus Huene 1933 [synonym], Indosuchus Huene 1933 [synonym]
G. †Sarcosaurus Andrews 1921
G. †Spinosaurus Stromer 1915
G. †Szechuanosaurus Young 1942
Invalid names: Allosauridae Marsh 1878 [synonym]
Fm. †Palaeosauridae Huene 1932
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G. †Aetonyx Broom 1911
G. †Gryponyx Broom 1911
G. †Palaeosaurus Riley and Stutchbury 1836
Invalid names: Gryponychidae Huene 1932 [synonym]
Fm. †Teratosauridae Cope 1871 [teratosaurid]
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G. †Cladeiodon Owen 1841
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Invalid names: Claderodon Owen 1841 [misspelling], Cladyodon Owen 1841 [misspelling]
G. †Gresslyosaurus Rütimeyer 1856 [Gressly's lizard]
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Invalid names: Dinosaurus Rütimeyer 1856 [synonym], Pachysaurus Huene 1905 [synonym], Picrodon Seeley 1898 [synonym]
G. †Orosaurus Huxley 1866
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Invalid names: Basutodon Huene 1932 [synonym], Orinosaurus Lydekker 1889 [synonym]
G. †Sinosaurus Young 1940 [China lizard]
G. †Teratosaurus Meyer 1861
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Invalid names: Avalonia Seeley 1898 [synonym], Smilodon Plieninger 1846 [synonym], Zanclodon Plieninger 1846 [synonym]
G. †Zatomus Cope 1871
Invalid names: Zanclodontidae Marsh 1882 [synonym]
Fm. †Tyrannosauridae Osborn 1906 [tyrannosaurid]
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G. †Alectrosaurus Gilmore 1933
G. †Aublysodon Leidy 1868
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Invalid names: Albertosaurus Osborn 1905 [synonym], Deinodon Leidy 1856 [synonym], Gorgosaurus Lambe 1914 [synonym], Teinurosaurus Nopcsa 1928 [synonym]
G. †Genyodectes Woodward 1901
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Invalid names: Clasmodosaurus Ameghino 1898 [synonym], Loncosaurus Ameghino 1899 [synonym]
G. †Prodeinodon Osborn 1924
G. †Tyrannosaurus Osborn 1905 [tyrant lizard]
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Invalid names: Dynamosaurus Osborn 1905 [synonym], Manospondylus Cope 1892 [synonym]
Invalid names: Deinodontidae Brown 1914 [synonym]
Subor. Coelurosauria Huene 1914 [coelurosaur]
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G. †Ammosaurus Marsh 1891
Fm. †Coeluridae Marsh 1881 [coelurid]
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G. †Agrosaurus Seeley 1891
G. †Aristosuchus Seeley 1887
G. †Caudocoelus Huene 1932
G. †Chirostenotes Gilmore 1924
G. †Coelosaurus Leidy 1865
G. †Coeluroides Huene 1933
G. †Compsognathus Wagner 1861 [elegant jaw]
G. †Compsosuchus Huene 1933
G. †Dromaeosaurus Matthew and Brown 1922
G. †Elaphrosaurus Janensch 1920
G. †Jubbulpuria Huene 1933
G. †Laevisuchus Huene 1933
G. †Saurornithoides Osborn 1924
G. †Sinocoelurus Young 1942
G. †Thecocoelurus Huene 1923
G. †Thecospondylus Seeley 1882
G. †Troodon Leidy 1856
G. †Velociraptor Osborn 1924
G. †Walgettosuchus Huene 1932
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Invalid names: Fulgurotherium Huene 1932 [synonym], Rapator Huene 1932 [synonym]
Invalid names: Coelurosauridae Cope 1882 [synonym], Compsognathidae Cope 1871 [synonym]
Fm. †Hallopodidae Marsh 1881 [hallopodid]
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G. †Hallopus Marsh 1881
G. †Halticosaurus Huene 1908
G. †Procompsognathus Fraas 1913 [before elegant jaw]
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Invalid names: Pterospondylus Jaekel 1914 [synonym]
Invalid names: Procompsognathidae Huene 1929 [synonym]
Fm. †Ornithomimidae Marsh 1890 [ornithomimid]
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G. †Betasuchus Huene 1932
G. †Macrophalangia Sternberg 1932
G. †Ornithomimoides Huene 1933
G. †Oviraptor Osborn 1924
Fm. †Podokesauridae Huene 1914
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G. †Avipes Huene 1932
G. †Coelophysis Cope 1889
G. †Dolichosuchus Huene 1932
G. †Lukousaurus Young 1940
G. †Podokesaurus Talbot 1911
G. †Saltopus Huene 1910
G. †Spinosuchus Huene 1932
G. †Velocipes Huene 1932
Invalid names: Segisauridae Camp 1936 [empty]
G. †Paronychodon Cope 1876
G. †Pneumatoarthrus Cope 1870
G. †Polyodontosaurus Gilmore 1932
Infraor. †Prosauropoda Huene 1920 [prosauropod]
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Fm. †Plateosauridae Marsh 1895 [plateosaurid]
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G. †Lufengosaurus Young 1940
G. †Plateosaurus Meyer 1837
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Invalid names: Dimodosaurus Pidancet and Chopard 1862 [synonym], Platysaurus Agassiz 1846 [synonym], Sellosaurus Huene 1905 [synonym]
Fm. †Thecodontosauridae Lydekker 1890
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G. †Dromicosaurus Van Hoepen 1920
G. †Gyposaurus Broom 1911
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Invalid names: Aristosaurus Van Hoepen 1920 [synonym], Hortalotarsus Seeley 1894 [synonym]
G. †Massospondylus Owen 1854
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Invalid names: Leptospondylus Owen 1854 [synonym], Pachyspondylus Owen 1854 [synonym]
G. †Spondylosoma Huene 1942
G. †Thecodontosaurus Riley and Stutchbury 1836
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Invalid names: Amphisaurus Marsh 1882 [synonym], Anchisaurus Marsh 1885 [synonym], Megadactylus Hitchcock 1865 [synonym]
G. †Yaleosaurus Huene 1932
G. †Yunnanosaurus Young 1940
Invalid names: Melanorosauridae Huene 1929 [empty]
G. †Stenonychosaurus Sternberg 1932
G. †Tichosteus Cope 1877
G. †Zapsalis Cope 1876
G. Tomistoma Müller 1846 [false gharial]
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Invalid names: Pyrenodon Dujardin 1843 [synonym]
Fm. †Ceratopsidae Marsh 1888 [ceratopsid]
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G. †Anchiceratops Brown 1914
G. †Arrhinoceratops Parks 1925
G. †Brachyceratops Gilmore 1914
G. †Diceratops Hatcher and Lull 1905
G. †Eoceratops Lambe 1915
G. †Notoceratops Tapia 1919 [southern horn face]
G. †Pentaceratops Osborn 1923
G. †Sterrholophus Marsh 1891
G. †Styracosaurus Lambe 1913
G. †Torosaurus Marsh 1891
G. †Triceratops Marsh 1889
Subor. †Pseudosuchia Zittel 1890
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Fm. †Ornithosuchidae Huene 1908
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G. †Cerritosaurus Price 1946
G. †Erpetosuchus Newton 1894
G. †Hesperosuchus Colbert 1952
G. †Ornithosuchus Newton 1894
G. †Rhadinosaurus Seeley 1881
Invalid names: Scleromochlidae Huene 1914 [empty], Sphenosuchidae Huene 1922 [empty]