Kingdom Animalia Class Cephalopoda Order Ceratitida Rank Family | Phylum Mollusca Subclass Ammonoidea Superfamily Xenodiscaceae | |
Xenoceltitidae are evolute, generally ribbed, upper Lower Triassic Ceratitida with ceratitic or goniatitic sutures; formerly included in the Noritaceae but now placed in the Xenodiscaceae.
The Xenoceltitidae are derived from the Ophiceratidae.
References
Xenoceltitidae Wikipedia(Text) CC BY-SA