Classification of Berman 1977

Cl. Reptilia Laurenti 1768 [reptile]
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Or. †Pelycosauria Cope 1878 [pelycosaur]
Or. †Pelycosauria Cope 1878 [pelycosaur]
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Fm. †Sphenacodontidae Marsh 1878
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Subfm. †Sphenacodontinae Romer 1936
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G. †Dimetrodon Cope 1878