Sphenacodontoidea
Sphenacodontoidea is Superfamily of the Pelycosaurs. Which Includes Sphenacodontids and Edaphosaurids.
| Sphenacodontoids Temporal range: Late Carboniferous-Recent,
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| Fossilized skull of two sphenacodontoids : Clelandina (Therapsida, Gorgonopsidae) and a Dimetrodon (Sphenacodontidae). | |
Scientific classification 
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| Kingdom: | Animalia |
| Phylum: | Chordata |
| Clade: | Haptodontiformes |
| Clade: | Sphenacomorpha |
| Clade: | Sphenacodontia |
| Clade: | Sphenacodontoidea |
| Clades | |