Classification of Osborn 1903

Cl. Reptilia Laurenti 1768 [reptile]
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Subcl. Diapsida Osborn 1903 [diapsid]
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Or. Crocodilia Owen 1842 [crocodilian]
Or. Dinosauria Owen 1842 [dinosaur]
Or. †Ichthyosauria de Blainville 1835 [ichthyosaur]
Or. †Phytosauria Jaeger 1828
Or. †Pterosauria Kaup 1834 [pterosaur]
Or. Rhynchocephalia Günther 1867 [rhynchocephalian]
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Subor. †Mesosauria Seeley 1892
Or. †Pelycosauria Cope 1878 [pelycosaur]
Invalid names: Proganosauria Baur 1887 [empty]
Or. Squamata Oppel 1811 [squamates]
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Subor. Lacertilia Owen 1842 [lizard]
Subor. Ophidia Latreille 1804 [snake]
Invalid names: Mosasauria [empty]
Subcl. Synapsida Osborn 1903 [synapsid]
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Or. †Anomodontia Owen 1859
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Subor. Cynodontia Owen 1861 [cynodont]
Or. †Dicynodontia Owen 1859 [dicynodont]
Subor. †Gomphodontia Seeley 1895
Subor. †Placodontia Cope 1871 [placodont]
Subor. Theriodontia Owen 1876
Or. Cotylosauria Cope 1880
Or. †Plesiosauria de Blainville 1835 [plesiosaur]
Or. Testudinata Oppel 1811 [turtle]
Invalid names: Protherosauria Osborn 1902 [replaced]