Classification of the suborder Sphenacodontia
Subor. †Sphenacodontia Romer and Price 1940
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Fm. †Homodontosauridae Kuhn 1961
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G. †Palaeohatteria Credner 1888
G. †Pantelosaurus v. Huene 1925
Unr. †Sphenacodontoidea
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Fm. †Sphenacodontidae Marsh 1878
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Subfm. †Secodontosaurinae Romer and Price 1940
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G. †Secodontosaurus Romer 1936
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†Secodontosaurus obtusidens Cope 1880
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Invalid names: Dimetrodon longiramus Case 1907 [synonym], Secodontosaurus willistoni Romer 1936 [synonym]
Subfm. †Sphenacodontinae Romer 1936
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G. †Bathygnathus Leidy 1853
G. †Ctenospondylus Romer 1936
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†Ctenospondylus casei Romer 1936
†Ctenospondylus ninevehensis Berman 1978
G. †Dimetrodon Cope 1878
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†Dimetrodon angelensis Olson 1962
†Dimetrodon booneorum Romer 1937
†Dimetrodon borealis Leidy 1853
†Dimetrodon dollovianus Cope 1888
†Dimetrodon giganhomogenes Case 1907
†Dimetrodon limbatus Cope 1877
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Invalid names: Dimetrodon incisivus Cope 1878 [synonym], Dimetrodon rectiformis Cope 1878 [synonym], Dimetrodon semiradicatus Cope 1881 [synonym]
†Dimetrodon loomisi Romer 1937
†Dimetrodon milleri Romer 1937
†Dimetrodon natalis Cope 1878
†Dimetrodon occidentalis Berman 1977
†Dimetrodon teutonis Berman et al. 2001
G. †Neosaurus Nopsca 1923
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†Neosaurus cynodus Gervais 1869
Invalid names: Geosaurus Gervais 1869 [replaced]
G. †Sphenacodon Marsh 1878
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†Sphenacodon britannicus von Huene 1908
†Sphenacodon ferocior Romer 1937
†Sphenacodon ferox Marsh 1878
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Invalid names: Scoliomus puercensis Williston and Case 1913 [synonym]
Invalid names: Oxyodon von Huene 1908 [replaced]
Invalid names: Dimetrodon kempae Romer 1937 [nomen dubium], Eosyodon Olson 1962 [nomen dubium], Eosyodon hudsoni Olson 1962 [nomen dubium], Palaeohatteriidae Baur 1889 [synonym], Pantelosauridae Huene 1925 [synonym], Varanopsinae Romer 1936 [empty]
Fm. †Tappenosauridae Olson and Beerbower 1953
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Invalid names: Anningiidae Broom 1927 [empty], Haptodontinae Romer and Price 1940 [empty]