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

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Two nurse sharks hover over a baited cage
Lesson Plan

Caribbean Coral Reef and Climate Case Study

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The small larvae of elkhorn coral (Acropora palmata) settle and grow on the crustose coralline algae species Hydrolithon boergesenii.
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Coral Larvae Settling

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This species of bamboo coral, discovered in 2004 in the Pacific Northwest, has unusually long and impressive tentacles.
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New Bamboo Coral

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A fan-shaped colony of red coral (Corallium sp.) provides a perch for three basket stars as they feed.
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Red Coral

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Tree corals like this Calyptrophora bayer can grow several meters high and resemble brightly colored trees.
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Red Tree Coral

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The mandarinfish lives in western Pacific tropical coral reef ecosystems and lacks the scales that are typically seen on bony fish.
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Mandarinfish Duo

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Algae has overtaken this coral reef off heavily populated Kiritimati, or Christmas Island.
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Unhealthy Coral Reef, Kiritimi, Line Islands

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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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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 school of Hawaiian squirrelfish.
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A School of Hawaiian Squirrelfish

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A stingray swims in an Australian marine reserve.
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Australia's 1.2 Million Mile Marine Reserve

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