†subfamily Secodontosaurinae Romer and Price 1940 (synapsid)
Osteichthyes - Synapsida - Sphenacodontidae
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: Sphenacodontidae according to R. R. Reisz 1986
See also Kemp 1982, Kuhn 1946, Kuhn 1966 and Romer and Price 1940
Sister taxa: Cryptovenator, Ctenorhachis, Dimetrodon kempae, Eosyodon, Eosyodon hudsoni, Sphenacodontinae, Varanopsinae
Subtaxa: Secodontosaurus
Ecology:
Distribution:
• Permian of United States (5: Texas collections)
Total: 5 collections each including a single occurrence