This ammonite is probably from the Portland Sand. Ammonites belong to a group of animals known as cephalopods, from the Greek ‘cephalo’, meaning head and ‘pod’ meaning foot. They have a big head, large eyes and tentacles that developed from a primitive ‘foot’. Modern cephalopods include the nautilus, squid, cuttlefish and octopus.
Find out more about ammonites on the molluscs pages.