Classification of Thulborn 1975

Cl. Reptilia Laurenti 1768 [reptile]
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Subcl. Archosauria Cope 1869 [archosaur]
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Or. Crocodilia Owen 1842 [crocodilian]
Or. †Ornithischia Seeley 1888 [ornithischian]
Or. †Pterosauria Kaup 1834 [pterosaur]
Or. Saurischia Seeley 1888 [saurischian]
Or. †Thecodontia Owen 1859
Cl. Aves Linnaeus 1758 [bird]
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Subcl. †Archaeornithes Gadow 1893
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Or. Theropoda Marsh 1881 [theropod]
Invalid names: Archaeopterygiformes Furbringer 1888 [empty]
Subcl. Neornithes Gadow 1893