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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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Coral Head Near Pearl and Hermes Atoll, Hawaii
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Coral Head Near Pearl and Hermes Atoll

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A zoomed-in image of the crown-of-thorns sea star.
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Acanthaster planci

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A close-up image of red coral polyps.
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Star of the Reef: One Species at a Time

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Tiny sponge spicules.
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Sparkling Sponge Spicules

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A pearly razorfish
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Pearly Razorfish

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A close-up photo of dead man's fingers (Alcyonium digitatum), living in the Baltic Sea.
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Dead Man’s Fingers

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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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Dr. J. Murray Roberts photographed these living polyps from the Mingulay Reef Complex off Scotland in aquaria in 2010.
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Lophelia Pertusa Coral Polyps

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Cancer cells treated with discodermolide, a chemical from a sponge found on deep-sea coral reefs.
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Treated Cancer Cells

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This black coral is more than 4,200 years old. Named for the color of their skeletons, black corals come in many colors.
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How old is black coral?

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Scientists recently discovered the Christmas tree coral (Antipathes dendrochristos) off the southern California coast.
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New Christmas Tree Coral

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