†unranked clade Sphenacomorpha Ivakhnenko 2003 (synapsid)
Parent taxon: Eupelycosauria according to F. Spindler 2015
See also Ivakhnenko 2008, Spindler et al. 2015 and Spindler et al. 2019
Sister taxa: Edaphosauridae, Haptodontiformes, Ophiacodontidae, Varanopidae
Subtaxa: Sphenacodontia
Ecology: