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AMMONITES AND THEIR RELATIVES

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Home > FOSSILS > AMMONITES AND THEIR RELATIVES
 
AMMONITES AND THEIR RELATIVES

Ammonites were free-swimming marine molluscs with coiled shells and are among the most beautiful of all fossils.  The lived mostly in shallow seas and were active swimmers, catching prey with their tentacles.  They became extinct at the end of the Cretaceous period, at the same time as the dinosaurs.  ​Ammonites are part of an extinct class of molluscs called cephalopods.  Living cephalopods include squid, cuttlefish, octopus and nautilus.  

Included in this category are the ammonites' older relatives, the goniatites.  Also included here are the extinct group of cephalopods known as belemnites that lived at the same time as ammonites. Belemnites lived in the open sea and were probably very similar to squid; their bullet-shaped internal shell is all that usually remains of them.