Classification of Laurin and Reisz 1995
Subor. Cotylosauria Cope 1880
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Unr. Amniota Haeckel 1866 [amniote]
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Unr. Sauropsida Huxley 1864
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Fm. †Mesosauridae Baur 1889
Cl. Reptilia Laurenti 1768 [reptile]
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Subcl. Eureptilia Olson 1947 [eureptile]
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Fm. †Captorhinidae Case 1911
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G. †Captorhinoides Olson 1951
G. †Labidosaurus Cope 1896
G. †Protocaptorhinus Clark and Carroll 1973
G. †Romeria Price 1937
Unr. Romeriida Gauthier et al. 1988
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Unr. Diapsida Osborn 1903 [diapsid]
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Unr. †Araeoscelidia Williston 1913
Unr. †Younginiformes Romer 1933
G. †Paleothyris Carroll 1969
Unr. Synapsida Osborn 1903 [synapsid]
Unr. Batrachosauria Efremov 1946
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Unr. Cotylosauria Cope 1880
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Unr. †Diadectomorpha Watson 1917
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Fm. †Diadectidae Cope 1880
Fm. †Limnoscelidae Williston 1911
Fm. †Tseajaiidae Vaughn 1964
Subcl. †Parareptilia Lawrence 1868 [parareptile]
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Unr. †Procolophonia Seeley 1888
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Unr. †Pareiasauria Seeley 1888
Invalid names: Testudinomorpha Laurin and Reisz 1995 [empty]