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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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A whale shark swims with a diver off the coast of East Africa.
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The Big Five of the Ocean: Exploring the Waters of East Africa

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A scuba diver explores elkhorn corals growing on a tropical reef.
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Exploring a Reef

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An unidentified earplug from the National Museum of Natural History collection.
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Ocean Objects of Wonder

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A coral has just spawned. Each of the hundreds of polyps releases a small pink bundle of sperm and eggs.
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A Tale of Sex and Stress in the Ocean

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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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Two nurse sharks hover over a baited cage
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Treasures in Jeopardy

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After ocean scientists sort deep-sea coral samples into their different types, they measure and photograph the specimens.
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Studying Deep-Sea Corals

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A "reef hotel" made of PVS layers on the seafloor.
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Worth the Investment: Ocean Real Estate Reveals Hidden Diversity

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Orange and red deep-sea corals.
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Aleutian Coral Reef

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 Scientist Martha Nizinski holds a specimen of a fan sponge (Phakellia sp.) collected at a deep-sea coral study site off the coast of South Carolina.    
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Fan Sponge

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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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