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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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Octocorals dominated the seafloor on Chris Mah's Okeanos mission to Johnston Atoll in the remote Pacific Ocean.
Article

Deep-sea octocorals: An ecosystem of their own

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a yellow sea cucumber
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Deep Sea Cucumber

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A blue crab on the Mid-Atlantic coast of the U.S.
Article

A Bite of Bitter Crab

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A zoomed-in image of the crown-of-thorns sea star.
Article

A Plague of Sea Stars

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Two octopuses sitting underwater highlight the different textures the animals can take on.
Overview

Octopuses, Squids, and Relatives

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a red sea star
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Red Sea Star

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a sea star splits in two
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Brittle Star Splits

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green and red pom poms adorn a decorator crab
Article

Happy Crabby Holidays

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A cross section of a ram's horn squid
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A Peculiar Squid

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A cnidarian brought up from the seafloor
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Deep-Sea Cnidarian

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This orange boring sponge (Cliona varians) overgrows several coral species at Panama's Smithsonian Tropical Studies Institute.
Article

Ocean Acidification Excites Boring Sponges

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