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A blue shark, with a copepod attached to its dorsal fin, coasts through waters near New England.
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Blue Shark

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These wormlike animals make spiral tracks on the sea floor.
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Deep-Sea Worms

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Two bright orange anemonefish poke their heads between anemone tentacles.
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Clownfish in their Host Anemone

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Blue Dragon nudibranchs are very common to the southeast coast of Australia and have a few color variations. Juveniles are white with blue rhinophores, and adults vary from dark purple to lavender to golden brown.
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Serpent Pteraeolidia

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A tusk shell hermit crab peeks out of his shell.
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Tusk Shell Hermit Crab

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Close-up photograph of translucent coral polyps, showing the symbiotic algae living inside.
Slideshow

Zooxanthellae and Coral Bleaching

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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.
Article

Long Before Coral, Mollusks Built the Ocean's Reefs

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a crab next to a coral den
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Crabs Make Coral Castles

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A purple, white and black spotted cleaner shrimp sits on an anemone.
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The Spotted Cleaner Shrimp

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A tusk shell hermit crab peeks out of his shell.
Article

Uncovering Biodiversity Before It Disappears

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A shell placed in seawater with increased acidity slowly dissolves over 45 days.
Overview

Ocean Acidification

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A reddish-orange nudibranch.
Slideshow

A Collage of Nudibranch Colors

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