†unranked clade Sphenacodontoidea

Osteichthyes - Synapsida

Parent taxon: Sphenacodontia according to J. Fröbisch et al. 2011

See also Daly 1973

Sister taxa: Anningiidae, Cutleria, Haptodontinae, Homodontosauridae, Ianthodon, Palaeohatteria, Pantelosaurus, Shashajaia, Tappenosauridae

Subtaxa: Sphenacodontidae

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• Leonard of United States (7: Oklahoma, Texas collections)

• Wolfcamp of United States (20: New Mexico, Texas, Utah)

• Permian of Canada (1: Prince Edward Island), France (1), Germany (1), the United Kingdom (1), United States (72: New Mexico, Ohio, Oklahoma, Texas, Utah)

• Virgilian of United States (2: New Mexico)

• Carboniferous to Permian of United States (2: New Mexico, Utah)

• Carboniferous of the Czech Republic (1), Germany (1), United States (1: Illinois)

Total: 110 collections including 137 occurrences

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