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UV light illuminates growth rings in a cross-section of 44-year-old Primnoa resedaformis coral found about 400 m (1,312 ft) deep off Newfoundland.
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Coral Growth Rings

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A crown-of-thorns starfish in the Marianas Islands.
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Mystery Photo: Prickly Puzzler on the Reef

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A hermit crab looks out from its coral dwelling in the waters of Japan's Ogasawara Islands.
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Coral Hermit Crab

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A live coral polyp with turquoise tissue and brown tentacles closes its mouth (the slit at the center of the radiating ribs) tight.
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Closed-Mouth Coral

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Photo of coral polyp, with a single bleach polyp.
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Corals Threatened by Acid Seas

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Shown here are several deep-sea coral species: From left to right are an unidentified purple octocoral, a small gold acanthorgorgiid octocoral, and a large colony of pink Corallium secundum
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Diverse Deep-Sea Corals

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: A thicket of Lophelia pertusa, a widespread deep sea coral, shelters a squat lobster.
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Coral Thicket with Lobster

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This deep-sea coral specimen shows the bands that help marine scientists learn how ocean conditions changed over time.
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Deep-Sea Coral Bands

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The toothy goby or common ghost goby (Pleurosicya mossambica) has a commensal relationship with soft corals and sponges in the Indo-Pacific ocean.
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Toothy Goby in Coral

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Dr. Brendan Roark discusses different methods of sampling deep-sea corals with undergraduate students at Texas A&M University.
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Coral Scientist Brendan Roark: On an Urgent Mission

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Scientists discovered this 1.5-m (5-ft) tall yellow bamboo coral in 2007 off the coast of Hawaii in 1,459 m (4,787 ft) of water.
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New Bamboo Coral Discovery

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This orange boring sponge (Cliona varians) overgrows several coral species at Panama's Smithsonian Tropical Studies Institute.
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Boring Sponge on Coral

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