Vörlaag:Sphenacodontoidea
| Superregnum: || Eukaryota
|-
| Regnum: || Animalia
|-
| Phylum: || Chordata
|-
| Cladus: || Chordata Craniata
|-
| Subphylum: || Vertebrata
|-
| Infraphylum: || Gnathostomata
|-
| Superclassis: || Tetrapoda
|-
| Cladus: || Reptiliomorpha
|-
| Cladus: || Amniota
|-
| Cladus: || Synapsida
|-
| Cladus: || Eupelycosauria
|-
| Cladus: || Sphenacodontia
|-
| Cladus: || Sphenacodontoidea