Family
Choanoceratidae Miller, 1931
List of species
1. Choanoceras mutabile Lindström, 1890 | Wenlock
Luokittelu
| Organism group | Biota |
| Kingdom | Animalia |
| Phylum | Mollusca |
| Class | Cephalopoda |
| Subclass | Orthoceratia |
| Order | Orthocerida |
| Suborder | Orthoceratina |
| Family | Baltoceratidae |
| Choanoceratidae | |
| Genus | Choanoceras |
| Family | Kionoceratidae |
| Stereoplasmoceratidae | |
| Genus | Tripteroceras |