Ammonites are a group of extinct marine animals that were famous for their spiral shells. They were some of the first animals to have a shell that was made of many parts.

  • The ammonites lived during the Jurassic period, which was about 200 million years ago.

Definition of ammonites


Any of an extinct group of cephalopods of the subclass Ammonoidea; a fossil shell of such an animal.


ammonid, ammonoid

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