They are an extinct group of ammonoids, which are shelled cephalopods related to squids, belemnites, octopuses, and cuttlefish, and more distantly to the nautiloids.
Ammonoids from this extinct group belong to the shelled cephalopod family, closely related to squids, belemnites, octopuses, cuttlefish, and nautiloids, though they are more distantly connected.