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Photograph from above of a lavender-colored sea-slug with deep purple markings, swimming above a pink and orange surface.
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Purple Nudibranch

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A tongue-like organ called the radula rams food down the giant squid's throat.
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Giant Squid Beak and Radula

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S. pharaonis. Photographed in an aquarium at the visitor's center for the Hatfield Marine Science Center at Oregon State University.
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Pharaoh Cuttlefish

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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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This brightly colored squat lobster collected in Moorea is a common find among the coral heads. Although called lobsters, this group of crustaceans is more closely related to hermit crabs than to true lobsters.
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Squat Lobster

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Researchers adopted the “yabbie pump,” the long silver tool shown here, from Australian fishing gear.
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Collecting Shallow-Water Specimens with the "Yabbie Pump"

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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 Autonomous Reef Monitoring Structure was developed to help scientists study coral reef diversity and have now been adopted broadly to study diversity around the world.
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Reef Monitoring Structure

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A blue crab on the Mid-Atlantic coast of the U.S.
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Coastal Blue Crab

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Home is where the hull is: Since the dawn of seafaring, humankind has had to deal with pesky creatures, such as barnacles, that “foul” ship hulls and boat propellers like this one.
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Boat Propeller Fouled With Barnacles

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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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A pink sea cucumber covered in small spike-like protrusions.
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Sea Cucumber: One Species at a Time

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