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These wormlike animals make spiral tracks on the sea floor.
Photo

Deep-Sea Worms

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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.
Photo

Serpent Pteraeolidia

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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 crab next to a coral den
Photo

Crabs Make Coral Castles

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A purple, white and black spotted cleaner shrimp sits on an anemone.
Photo

The Spotted Cleaner Shrimp

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A reddish-orange nudibranch.
Slideshow

A Collage of Nudibranch Colors

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

Ocean Acidification

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