Hosta

Gastrioceratidae is one of five families of the Gastrioceratoidea superfamily. 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

• The Paleobiology Database Archived 2012-07-22 at the Wayback Machine accessed on 10/01/07