Description
All ammonites have a large external shell. Most shells are coiled, but some species have a more complicated helical shape, while others have simple, straight shells. The shells are divided into many chambers and the divisions to these chambers form complicated patterns on the outside of the shell. The sort parts of ammonites are rarely preserved, but like living octopus, squid and cuttlefish, they had a large head that projected out of the opening in the shell. The head would have had a large brain and well developed eyes and at least 8 tentacles.
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