Order Goniatitida Rank Family | Suborder Goniatitina | |
Marathonitidae is the only family in the Marathonitaceae superfamilies. They are an extinct group of ammonoid, which are shelled cephalopods related to squids, belemnites, octopuses, and cuttlefish, and more distantly to the nautiloids.
References
Marathonitidae Wikipedia(Text) CC BY-SA