perekond
Pycnoceras Hyatt, 1894
Klassifikatsioon
| organismirühm | Biota |
| domeen | Eukaryota |
| riik | Animalia |
| hõimkond | Mollusca |
| klass | Cephalopoda |
| alamklass | Tarphyceratia |
| selts | Tarphyceratida |
| sugukond | Estonioceratidae |
| perekond | Aethoceras |
| Aphetoceras | |
| Aserioceras | |
| Bentoceras | |
| Clytoceras | |
| Eichwaldoceras | |
| Estonioceras | |
| Falcilituites | |
| Pakrioceras | |
| Planctoceras | |
| Pycnoceras | |
| Shumardoceras | |
| Tragoceras |