This is one of the most eccentric ammonites from the Cretaceous period. Hamites has grown in a straight line, like a straw, rather than in a flat, spiral like most ammonites. During the middle part of the Cretaceous, ammonites underwent a great experiment in shape and form . It is thought that the extreme climate change that was taking place at the time may have been the cause, driving the ammonites to evolve differently.
Find out more about ammonites on the molluscs pages.