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]
Superor. Diaptosauria Osborn 1903
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Or. †Choristodera Cope 1876 [choristodere]
Or. †Pelycosauria Cope 1878 [pelycosaur]
Or. †Procolophonia Seeley 1888
Or. †Proganosauria Baur 1887
Or. †Protorosauria Huxley 1871
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Fm. †Palaeohatteriidae Baur 1889
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G. †Palaeohatteria Credner 1888
Fm. †Protorosauridae Cope 1871
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G. †Aphelosaurus Gervais 1858
G. †Protorosaurus Meyer 1830
Or. Rhynchocephalia Günther 1867 [rhynchocephalian]
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Fm. †Acrosauridae Meyer 1861
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G. †Acrosaurus Meyer 1854
G. †Anguisaurus Münster 1839
G. †Saurophidium Jourdan 1862
Fm. Homoesauridae Gervais 1852
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G. †Euposaurus Jourdan 1862
G. †Homoeosaurus Meyer 1850
Fm. †Pleurosauridae Lydekker 1888
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G. †Pleurosaurus Meyer
Fm. †Sauranodontidae Marsh 1879
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G. †Saphaeosaurus von Meyer 1850
G. †Sauranodon Jourdan 1862
Or. †Rhynchosauria Osborn 1903 [rhynchosaur]
Superor. Dinosauria Owen 1842 [dinosaur]
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Or. †Cetiosauria Seeley 1874
Or. †Orthopoda Cope 1866
Or. Theropoda Marsh 1881 [theropod]
Or. †Ichthyosauria de Blainville 1835 [ichthyosaur]
Or. †Phytosauria Jaeger 1828
Or. †Pterosauria Kaup 1834 [pterosaur]
Superor. Squamata Oppel 1811 [lizard]
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Or. Lacertilia Owen 1842 [lizard]
Or. †Mosasauria Marsh 1880
Or. Ophidia Latreille 1804 [snake]
Subcl. Synapsida Osborn 1903 [synapsid]
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Superor. †Anomodontia Owen 1859
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Or. Cynodontia Owen 1861
Or. †Dicynodontia Owen 1859 [dicynodont]
Or. †Gomphodontia Seeley 1895
Or. †Placodontia Cope 1871 [placodont]
Or. Theriodontia Owen 1876
Or. Cotylosauria Cope 1880
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Invalid names: Pareiasauria Seeley 1888 [synonym]
Superor. †Sauropterygia Owen 1861
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Or. †Nothosauria Baur 1889 [nothosaur]
Or. †Plesiosauria de Blainville 1835 [plesiosaur]
Or. Testudinata Oppel 1811 [turtle]