Genus
Clistrocystis Kozłowski, 1959
List of species
1. Clistrocystis graptolithophilius Kozłowski, 1959 | Ordovician
Classification
| Organism group | Biota |
| Incertae sedis (fossils) | |
| Infraclass | Calcified Microproblematica |
| Family | Ancientidae |
| Ovummuridae | |
| Genus | Alliumella |
| Clistrocystis | |
| Species | graptolithophilius |
| Genus | Lontohystrichosphaera |
| Polytrichoides | |
| Rugosoopsis | |
| Vikisphaera | |
| Species | Skolithos declinatus |