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Unlike the shallow tropical coral reef at left, the deep-sea Oculina reef at right does not require sunlight.
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Shallow and Deep-Sea Coral Reefs

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Flower-like clusters of pink polyps make up this coral colony.
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Coral Colony

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This piece of pocillopora, or cauliflower coral, would normally have a rigid outer skeleton, but researchers dissolved it to expose the coral’s tissue and take a sample for DNA analysis.
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Cauliflower Coral - Pocillopora

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Corallimorpharian
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Soft Coral Close-Up

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This photograph of Gerardia sp. was taken at the Cross Seamount in the Pacific Ocean at a depth of 400 m (1,312 feet).
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Gold Coral Close-up

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Red coral necklaces in a display window. Harvesting deep-sea coral to produce jewelry like this threatens these ecosystems.
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Coral for Sale

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A school of Hawaiian squirrelfish.
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A School of Hawaiian Squirrelfish

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A stingray swims in an Australian marine reserve.
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Australia's 1.2 Million Mile Marine Reserve

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Rockfish, anemones and other invertebrates inhabit this deep-sea coral reef in Cordell Bank National Marine Sanctuary.
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Deep-Sea Coral Habitat

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A piece of the Hyperbolic Crochet Coral Reef exhibit.
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A Rainbow of Crocheted Corals

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Valentinni's sharpnose puffer lives on Indo-Pacific coral reefs, where it shoals in groups of 10-100 puffers and feeds on algae and tunicates.
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Valentinni's Sharpnose Puffer

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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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