Order
Cassiduloida Agassiz and Desor, 1847
Classification
| Organism group | Biota |
| Kingdom | Animalia |
| Phylum | Echinodermata |
| Subphylum | Echinozoa |
| Class | Echinoidea |
| Phylum | Cidaroida |
| Order | Bothriocidaroida |
| Cassiduloida | |
| Genus | Conoclypeus |
| Order | Perischoechinoidea |
| Spatangoida | |
| Family | Archaeocidaridae |
| Nucleolitidae |
See also