Species
Rhynchorthoceras breynii (Boll, 1857)
Classification
| Organism group | Biota |
| Domain | Eukaryota |
| Kingdom | Animalia |
| Phylum | Mollusca |
| Class | Cephalopoda |
| Subclass | Orthoceratoidea |
| Order | Astroviida |
| Suborder | Lituitina |
| Family | Sinoceratidae |
| Genus | Rhynchorthoceras |
| zaddachi | |
| Species | angelini |
| beyrichii | |
| breynii | |
| conicum | |
| helgoeyense | |
| kranepuhlense | |
| rugium |