Family
Petalodontidae Newberry and Worthen, 1866
Classification
| Organism group | Biota |
| Kingdom | Animalia |
| Phylum | Chordata |
| Subphylum | Vertebrata |
| Infraphylum | Gnathostomata |
| Class | Chondrichthyes |
| Order | Holocephali |
| Petalodontiformes | |
| Family | Petalodontidae |
| Genus | Polyrhizodus |
See also