Cycloloboidea is one of seventeen superfamilies of the Goniatitina suborder. They are an extinct group of ammonoid, which are shelled cephalopods related to squids, belemnites, octopodes, and cuttlefish, and more distantly to the nautiloids. References The Paleobiology Database accessed on 10/01/07 Goniatitida superfamilies Goniatitina