Genus
Orcus Gailite, 1966
Classification
| Organism group | Biota |
| Kingdom | Animalia |
| Phylum | Arthropoda |
| Subphylum | Crustacea |
| Class | Ostracoda |
| Order | Beyrichicopida |
| Suborder | Palaeocopa |
| Superfamily | Primitiopsacea |
| Family | Primitiopsididae |
| Subfamily | Venzavellinae |
| Genus | Ardennea |
| Borussulus | |
| Orcus | |
| Venzavella |