Family
Cyathaxoniidae Milne-Edwards et Haime, 1851
List of species
1. Sutherlandinia gothlandica Weyer, 1978 | Wenlock
Classification
| Organism group | Biota |
| Kingdom | Animalia |
| Phylum | Cnidaria |
| Class | Anthozoa |
| Subclass | Rugosa |
| Order | Stauriida |
| Suborder | Streptelasmatina |
| Family | Acrophyllidae |
| Cyathaxoniidae | |
| Subfamily | Sutherlandiniinae |
| Family | Kodonophyllidae |
| Mucophyllidae | |
| Paliphyllidae | |
| Polycoeliidae | |
| Primitophyllidae | |
| Streptelasmatidae |