†suborder Sphenacodontia Romer and Price 1940
Full reference: A. S. Romer and L. I. Price. 1940. Review of the Pelycosauria. Geological Society of America Special Paper 28:1-538
Parent taxon: Sphenacomorpha according to F. Spindler 2015
See also Currie 1977, Fröbisch et al. 2011, Haubold 1971, Haughton and Brink 1954, Huene 1954, Kissel and Lehman 2002, Kissel and Reisz 2004, Kuhn 1946, Kuhn 1966, Langston and Reisz 1981, Lewis and Vaughn 1965, Olson 1966, Olson and Beerbower 1953, Romer and Price 1940 and Spindler et al. 2015
Sister taxa: none
Subtaxa: Anningiidae Cutleria Haptodontinae Homodontosauridae Ianthodon Palaeohatteria Pantelosaurus Shashajaia Sphenacodontoidea Tappenosauridae