Genus
Helminthidium Lindström, 1882
List of species
1. Helminthidium mirum Lindström, 1882 | Ludlow
Classification
| Organism group | Biota |
| Kingdom | Animalia |
| Phylum | Cnidaria |
| Class | Anthozoa |
| Subclass | Rugosa |
| Order | Stauriida |
| Suborder | Calostylina |
| Family | Calostylidae |
| Genus | Calostylis |
| Helminthidium | |
| Species | mirum |
| Genus | Palaearaea |