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The branches of a primnoid coral in the genus Calyptrophora provide a habitat for galathaoid crabs.
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Primnoid Coral

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The staghorn coral is listed as Threatened under the U.S. Endangered Species Act. It is one of 22 coral species listed.
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Staghorn Coral

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A purple hard coral releases bundles of pink eggs glued together with sperm.
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Coral Spawning

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3-D map of Chapman’s Reef. Produced in 2005 with multibeam sonar from an autonomous underwater vehicle (AUV).
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Deep-Sea Coral Reef Map

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A bluefin trevally swims in Hawaii’s Maro Coral Reef, part of the Papahānaumokuākea Marine National Monument.
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Hawaii’s Maro Coral Reef

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

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Whip coral gobies live on coral reefs throughout the Indo-Pacific, where they are found on a single species of coral: black wire coral.
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Whip Coral Goby Portrait

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Nuclear bomb in Bikini Atoll
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Nuclear Bombs on the Coral Reef

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These corals are dead—smothered in sediments and overgrown with algae.
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Dead Coral Overgrown with Algae

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Photograph of a bristly brown and white worm, with one end pressed against a pale green coral.
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Fireworm Takes on Fire Coral

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Walter Adey and the NMNH coral reef tank
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Walter Adey and Coral Reef Tank

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