Wikipedia
Xenoceltites
Xenoceltites is an extinct ceratite ammonite found world wide in the Lower Triassic. Xenoceltites belongs to the Xenoceltitidae, a taxonomic family within the ceratites that with two others now form the superfamily Xenodiscaceae. One of the earliest ceratites, Xenoceltities has a narrow planospiral shell with a compressed whorl section, that has a suture with 2 weakly toothed lateral lobes and irregular ribbing .