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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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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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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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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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A marine scientist performs a genetic analysis on a sample of deep-sea coral to find out if it is a known or new species.
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Genetic Analysis of Coral

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A coral head in the Mesoamerican Reef has both bleached and living coral. The white sections are bleached and the brown parts still contain zooxanthellae, the symbiotic algae that provide food to their coral hosts.
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Coral Under Pressure: Monitoring Bleaching In Real Time

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Staghorn Coral
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Staghorn Coral in a Hurricane

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Scientist Martha Nizinski examines a sample of the deep-sea coral Lophelia pertusa, collected 600-m (1,969-ft) deep off the coast of the southeastern United States.
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Deep-Sea Coral Sample

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