Classification of Osborn 1904

Cl. Reptilia Laurenti 1768 [reptile]
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Subcl. Diapsida Osborn 1903 [diapsid]
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Superor. Dinosauria Owen 1842 [dinosaur]
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Or. †Orthopoda Cope 1866
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Invalid names: Predentata Marsh 1894 [synonym]
Or. Theropoda Marsh 1881 [theropod]
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Subor. †Megalosauria Bonaparte 1850
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Invalid names: Thecodontia Owen 1859 [synonym]
Subor. †Symphypoda Cope 1867
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Invalid names: Compsognatha Huxley 1869 [synonym]
Invalid names: Opisthocoelia Owen 1859 [empty]
Or. †Pterosauria Kaup 1834 [pterosaur]
Superor. Squamata Oppel 1811 [squamates]
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Or. Lacertilia Owen 1842 [lizard]
Or. Ophidia Latreille 1804 [snake]
Invalid names: Mosasauria [empty]
Invalid names: Diaptosauria Osborn 1903 [empty]
Subcl. Synapsida Osborn 1903 [synapsid]
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Superor. †Anomodontia Owen 1859
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Or. †Dicynodontia Owen 1859 [dicynodont]
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Fm. †Cistecephalidae Broom 1903
Fm. †Dicynodontidae Owen 1859
Fm. †Endothiodontidae Owen 1876
Fm. †Lystrosauridae Broom 1903
Or. †Placodontia Cope 1871 [placodont]
Or. †Sauropterygia Owen 1859
Or. Testudinata Oppel 1811 [turtle]
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Subor. Cryptodira Cope 1868
Subor. Pleurodira Cope 1865 [sideneck turtle]
Subor. Trionychia
Or. Theriodontia Owen 1876
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Subor. Cynodontia Owen 1861 [cynodont]
Subor. †Therocephalia Broom 1903
Invalid names: Theromorpha Cope 1878 [synonym]
Or. Cotylosauria Cope 1880
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Fm. †Diadectidae Cope 1880
Fm. †Pareiasauridae Lydekker 1889
Fm. †Pariotichidae Cope 1883
Invalid names: Pareiasauria Seeley 1888 [synonym]
Subor. †Sauropterygia Owen 1859
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Subor. †Plesiosauria de Blainville 1835 [plesiosaur]
Invalid names: Simosauria Gervais 1845 [empty]