Classification of Currie 1977

Cl. Reptilia Laurenti 1768 [reptile]
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Subcl. Synapsida Osborn 1903 [synapsid]
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Or. †Pelycosauria Cope 1878 [pelycosaur]
Or. †Pelycosauria Cope 1878 [pelycosaur]
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Subor. †Sphenacodontia Romer and Price 1940
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Fm. †Sphenacodontidae Marsh 1878
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Invalid names: Haptodontinae Romer and Price 1940 [empty]