Genus
Calathium Billings, 1865
Classification
| Organism group | Biota |
| Incertae sedis (fossils) | |
| Phylum | Receptaculita |
| Order | Receptaculitales |
| Family | Receptaculitaceae |
| Genus | Calathium |
| Species | formosum |
| Genus | Fisherites |
| Ischadites | |
| Receptaculites |
| Organism group | Biota |
| Incertae sedis (fossils) | |
| Phylum | Receptaculita |
| Order | Receptaculitales |
| Family | Receptaculitaceae |
| Genus | Calathium |
| Species | formosum |
| Genus | Fisherites |
| Ischadites | |
| Receptaculites |