Order
Helodontiformes Patterson, 1965
Luokittelu
| Organism group | Biota |
| Kingdom | Animalia |
| Phylum | Chordata |
| Subphylum | Vertebrata |
| Organism group | Gnathostomata |
| Class | Chondrichthyes |
| Order | Holocephali |
| Helodontiformes | |
| Family | Helodontidae |
| Organism group | Biota |
| Kingdom | Animalia |
| Phylum | Chordata |
| Subphylum | Vertebrata |
| Organism group | Gnathostomata |
| Class | Chondrichthyes |
| Order | Holocephali |
| Helodontiformes | |
| Family | Helodontidae |