Fossil success story?
This species of bivalve lived from the Lower Jurassic to the Upper Cretaceous period. Its populations spread into seas around Europe, North America, South America, Africa and South-West Asia. So, unlike many ammonites that evolved quickly and can therefore be used to determine the relative age of the rocks in which they are found, this bivalve is of no use for that at all.
Find out more about bivalves on the molluscs pages.