fossil of perisphinctes, an extinct genus of ammonite cephalopod from the late jurassic period.

age ammonite ammonites ammonitida ammonoidea animal animalia background cephalopod cephalopoda closeup creature cretaceous detail exhibit extinct fauna fossil freshwater genus giant historical isolated jurassic life macro marine mollusc mollusca natural nature paleobiology paleontological paleontology paleozoic period perisphinctes plicatilis prehistoric replica science sea shell skeletal species specimen variocostatus white wild wildlife