Psiloceras planorbis-England

Ammonites were shelled cephalopods, predatory mollusks, that resembled squid and had eyes, tentacles, and spiral shells. These creatures lived in the seas between 240 - 65 million years ago, when they became extinct along with the dinosaurs. The name 'ammonite' originates from the Greek Ram-horned god called Ammon. Ammonites belong to a group of predators known as cephalopods, which includes their living relatives the octopus, squid, cuttlefish and nautilus.

Psiloceras planorbis, Jurassic, Blue Lias fm., North Somerset, England