Haploceras

Haploceras is a genus of late Upper Jurassic (Kimmeridgian and Tithonian) ammonoid cephalopods and the type for the Haploceratidae, similar to Lissoceras but with a broader whorl section and small blunt lappets and a blunt rostrum; some species with feeble ventral  folds on body chamber.

Distribution
Jurassic deposites in North America, Africa, Europe and the mid east.