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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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Flame shells live in enormous colonies, but hidden in nests.
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Orange-Tentacled Flame Shell

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This common octopus (Octopus vulgaris) shows off its siphon, which it uses to propel itself through the water.
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Octopus Shows Off Its Funnel

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A pink, white and black colored boxing crab holds two anemones in its claws.
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Boxing Crab

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Fireworm Setae
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Fireworm Bristles

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A live coral polyp with turquoise tissue and brown tentacles closes its mouth (the slit at the center of the radiating ribs) tight.
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Closed-Mouth Coral

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Beating Cilia of Comb Jelly Combs
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Sea Gooseberry Larva

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Tiny sponge spicules.
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Sparkling Sponge Spicules

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A nudibranch showing a closeup of their fleshy, tentacle-like growths, called cerata.
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Aeolid Nudibranch Defense

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A mangrove tree crab clings to a leaf near a Smithsonian marine laboratory in Panama.
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Mangrove Tree Crab

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The elusive giant squid
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Giant Squid Caught Live On Screen

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Like other cephalopods, the common cuttlefish (Sepia officials Linnaeus, 1758) possesses serious brain power.
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Common cuttlefish

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