Austroceratites

Austroceratites is a genus of extinct shelled cephalopods that lived during the Triassic, included in ammonoid order Ceratitida. Within the Ceratitida, "Autroceratites" belongs in the family Ceratitidae and subfamily Ceratitinae.
Ceratitidae, in which "Austroceratites" is placed, is a mid Triassic family that has left evolute to involute, stoutly ribbed, discoidal shells with ceratitic sutures.