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Gerardia, or gold coral, species often have a tree-like shape, as evident in this specimen.
Photo

Gold Coral

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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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Colorful Christmas tree worms
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A Forest of Christmas Tree Worms

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This 200-year-old bamboo coral colony is growing on the Davidson Seamount. The skeleton has bamboo-like segments.
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Bamboo Coral

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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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Colorful fishes throng a reef in the Northwestern Hawaiian Islands.
Slideshow

Bizarre and Beautiful Coral Reef Animals

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Many medicines were based on a chemical from the sea sponge Tectitethya crypta.
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From Sea Sponge to HIV Medicine

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Dr. Brendan Roark discusses different methods of sampling deep-sea corals with undergraduate students at Texas A&M University.
Article

Coral Scientist Brendan Roark: On an Urgent Mission

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

A Plague of Sea Stars

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dead coral from disease
Article

Sickness in the Sea: A Coral Plague Hits Florida

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

Zooxanthellae and Coral Bleaching

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Corals, sponges, and algae are the major components of most coral reef communities as shown in this picture.
Overview

Corals and Coral Reefs

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