Classification of Gauthier et al. 1988

Subcl. Diapsida Osborn 1903 [diapsid]
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Or. †Araeoscelidia Williston 1913
Subph. Tetrapoda Goodrich 1930 [tetrapod]
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Cl. Amphibia Linnaeus 1758
Anthracosauria Säve-Söderbergh 1934
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Superfm. †Anthracosauroidea Cope 1872
Batrachosauria Efremov 1946
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Cotylosauria Cope 1880
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Subor. †Diadectomorpha Watson 1917
Subor. †Seymouriamorpha Watson 1917
G. †Solenodonsaurus Broili 1924
Subor. Cotylosauria Cope 1880
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Amniota Haeckel 1866 [amniote]
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Subcl. †Parareptilia Olson 1947 [parareptile]
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Fm. †Mesosauridae Baur 1889
Synapsida Osborn 1903 [synapsid]
Cl. Amniota Haeckel 1866 [amniote]
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Cl. Reptilia Laurenti 1768 [reptile]
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Subcl. Anapsida Williston 1917 [anapsid]
Romeriida Gauthier et al. 1988
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Diapsida Osborn 1903 [diapsid]
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Sauria Gauthier 1984 [crown diapsid]
G. †Paleothyris Carroll 1969
Subcl. †Parareptilia Olson 1947 [parareptile]
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Fm. †Millerettidae Romer 1956
Subor. †Pareiasauria Seeley 1888
Procolophonia Seeley 1888