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

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An illustration of the megalodon shark.
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Ancient Giant Megatooth Shark

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Color illustration of an ancient bivalve.
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Elevator Rudists

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A rendering of an underwater marine scene from the Proterozoic Eon, featuring a creature that resembles a jellyfish and other organisms.
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Ediacaran Community, Proterozoic Eon (2,500 - 542 Million Years Ago)

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Notice the pink tentacles, which “recliners” used to filter feed.
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Recliner Rudists

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A rendering of an underwater marine scene from the Cambrian Period, featuring an arthropod, annelids, and other animals.
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Cambrian Period (542 – 488 Million Years Ago)

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A rendering of an underwater marine scene depicting life ~145-65 million years ago, when rudist clams were the major reef builders.
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Carbonate Reef (Cretaceous Period: 145 - 65 Million Years Ago)

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A rendering of an underwater marine scene depicting life ~145-65 million years ago, when rudist clams were the major reef builders.
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Long Before Coral, Mollusks Built the Ocean's Reefs

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Illustration of the Paleozoic shallow water habitat.
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A Mississippian Marine Habitat (359 - 318 Million Years Ago)

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A skeleton of an ichthyosaur
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An Ichthyosaur's Bones

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a fossilized jawbone and tooth of an ichthyosaur
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An Ichthyosaur Jaw Bone

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serrations from sharks on a fossilized whalebone
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Bite Marks From the Past

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