Family
Billingsariidae Okulitch, 1936
Luokittelu
| Organism group | Biota |
| Kingdom | Animalia |
| Phylum | Cnidaria |
| Class | Anthozoa |
| Subclass | Tabulata |
| Order | Sarcinulida |
| Family | Billingsariidae |
| Genus | Billingsaria |
| Family | Syringophyllidae |
| Theciidae |
| Organism group | Biota |
| Kingdom | Animalia |
| Phylum | Cnidaria |
| Class | Anthozoa |
| Subclass | Tabulata |
| Order | Sarcinulida |
| Family | Billingsariidae |
| Genus | Billingsaria |
| Family | Syringophyllidae |
| Theciidae |