Genus
Holmicrusta Kozłowski, 1962
List of species
1. Holmicrusta sombrero Kozłowski, 1962 | Ordovician
Klassificering
| Organism group | Biota |
| Domain | Eukaryota |
| Kingdom | Animalia |
| Phylum | Hemichordata |
| Class | Pterobranchia |
| Subclass | Graptolithina |
| Family | Wimanicrustidae |
| Supergenus | Urbanekicrusta |
| Genus | Bulmanicrusta |
| Ellesicrusta | |
| Graptoblastoides | |
| Graptoblastus | |
| Holmicrusta | |
| Species | sombrero |
| Genus | Hormograptus |
| Lapworthicrusta | |
| Maenniligraptus | |
| Ruedemannicrusta | |
| Thallograptus | |
| Wimanicrusta | |
| Xenocyathus |