Subgenus
Delthyris (Quadrifarius) Fuchs, 1923
Classification
| Organism group | Biota |
| Kingdom | Animalia |
| Phylum | Brachiopoda |
| Subphylum | Rhynchonelliformea |
| Class | Rhynchonellata |
| Order | Spiriferida |
| Suborder | Delthyridina |
| Superfamily | Delthyrioidea |
| Family | Delthyrididae |
| Subfamily | Delthyridinae |
| Genus | Delthyris |
| Subgenus | (Delthyris) |
| (Quadrifarius) |