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A sea butterfly, or sea snail, swims in the open ocean.
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A Swimming Snail

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This purple urchin Paleopneustes cristatus is seldom seen by itself, and can be found in groups of hundreds.
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Purple Sea Urchin

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In this photo of a shallow coral reef in the Pacific there are three species of forams. Their colors come from the symbiotic algae that live inside the foram shells.
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Shallow Coral Reef Foraminifers

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Dr. Clyde Roper (rear) and museum specialist Mike Sweeny examine a giant squid specimen.
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Studying Giant Squid

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Squid expert Dr. Clyde Roper examines specimens stored in jars in the Smithsonian collection.
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Dr. Clyde Roper

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Small orange brittlestars on the coast of the Atlantic.
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An Invasive Brittlestar

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This new species of lobster (Dinochelus ausubeli) is blind and has bizarre claws. It was discovered about 300 meters (984 feet) deep in the Philippine Sea by a Census of Marine Life expedition.
Slideshow

Deep Ocean Diversity Slideshow

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Corals, sponges, and algae are the major components of most coral reef communities as shown in this picture.
Overview

Corals and Coral Reefs

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green and red pom poms adorn a decorator crab
Article

Happy Crabby Holidays

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Two baby olive ridley sea turtles.
Article

Surveying Life On Sea Turtles

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A blue-ringed octopus
Article

How Octopuses and Squids Change Color

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Many medicines were based on a chemical from the sea sponge Tectitethya crypta.
Article

Five Questions for Shirley Pomponi, Medical Sponge Hunter

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