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This colony of Lophelia pertusa was photographed from the Mingulay Reef Complex off Scotland in 2005.
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Lophelia pertusa Colony

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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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The fringe of a white Christmas tree worm.
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White Christmas Tree Worm

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Branching coral in naturally acidic water.
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Fragile Branching Corals in Acidic Water

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Coral reefs provide food for swarms of fish, both large and small.
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Coral Reef in the Florida Keys

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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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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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The Johnson-Sea-Link submersible returns with a specimen of Keratoisis bamboo coral inside its collection box.
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Submersible with Coral Samples

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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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Tiny sponge spicules.
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Sparkling Sponge Spicules

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This bubblegum coral has a fanlike shape. It is growing 1,310 m (4,298 ft) deep on the Davidson Seamount.
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Bubblegum Coral

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Corals, sponges, and algae are the major components of most coral reef communities as shown in this picture.
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Coral Reef on Gangga Island, Indonesia

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