Classification of Lewis and Vaughn 1965
Cl. Reptilia Laurenti 1768 [reptile]
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Subcl. Anapsida Williston 1917 [anapsid]
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Or. Cotylosauria Cope 1880
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Subor. †Captorhinomorpha Watson 1917
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Fm. †Captorhinidae Case 1911
Fm. †Limnoscelidae Williston 1911
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Or. †Pelycosauria Cope 1878 [pelycosaur]
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Subor. †Ophiacodontia Romer and Price 1940
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Subor. †Sphenacodontia Romer and Price 1940
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