Arctoptychites

Arctoptychites is a genus of extinct cephalopods belonging to the ceratitid family Ptychitidae, and related to such genera as "Ptychites" and "Aristoptychites"; all from the Triassic.
The Ptychitidae, to which "Arctoptychites" belongs, is a family of ceratitid ammonites ("sensu lato") with ammonitic sutures and variably subglobular to compressed, ribbed or smooth, generally evolute shells.