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Color illustration of an ancient bivalve.
slideshow

Rudist Reefs

 About 100 million years ago, during the heyday of the dinosaurs, reefs were built...
Fri, 12/04/2009 - 14:25
Notice the pink tentacles, which “recliners” used to filter feed.
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Recliner Rudists

 Where ocean currents were strong, ancient rudist “recliners” lay unattached on...
Illustration of the extinct ammonite, related to the modern squid.
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Ammonite

 Like the modern nautilus, this relative of modern squid hunted from inside the safe...
Rudist clams are mollusks that went extinct about 65 million years ago.
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Rudist Clams

 Rudist clams are mollusks that went extinct about 65 million years ago. They were...