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Molluscs - Ammonites

Ammonites are a form of ammonoid distinguished by their complex suture lines. They were abundant and diverse in the seas of the Mesozoic Era, and they evolved very rapidly to produce a number of species and genera. After a decline in diversity during the late Cretaceous period, ammonites become extinct at the same time as other marine groups, such as Belemnites, and terrestrial groups, such as dinosaurs.
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Idoceras Ammonite (152)
Actual Fossil