They are an extinct group of ammonoid, 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 class of shelled cephalopods that include squids, belemnites, octopuses, cuttlefish, and nautiloids; however, they are more distantly related within the cephalopod family.