Order
Helodontiformes Patterson, 1965
Classification
| Organism group | Biota |
| Kingdom | Animalia |
| Phylum | Chordata |
| Subphylum | Vertebrata |
| Infraphylum | Gnathostomata |
| Class | Chondrichthyes |
| Order | Holocephali |
| Superorder | Holocephalomorpha |
| Order | Helodontiformes |
| Family | Helodontidae |
| Order | Petalodontiformes |