Chondrichthyes - Euselachii - Sphenacanthidae
Parent taxon: Euselachii according to A. O. Ivanov et al. 2013
See also Ginter et al. 2010 and Ivanov 1999
Sister taxa: Acronemus, Artiodus, Cheirostephanus, Ctenacanthiformes, Dasyatiformes, Favusodus, Galei, Galeoidei, Hueneichthys, Hybodonta, Hybodontiformes, Musteliformes, Neoselachii, Notidaniformes, Protacrodontiformes, Protacrodontoidea, Scyliorhiniformes, Squatinoidei, Squatinorajiformes, Surcaudalus, Synechodontidae
Subtaxa: Khuffia Sphenacanthus
Type: Sphenacanthus
Ecology: nektonic carnivore
Distribution:
• Permian of Brazil (2 collections), Oman (8), the Russian Federation (5), United States (1: Texas)
• Carboniferous of the United Kingdom (2), United States (2: Illinois, Texas)
• Devonian of the Russian Federation (1)
Total: 21 collections including 27 occurrences