GEORGETTE DOUWMA / SCIENCE PHOTO LIBRARY GEORGETTE DOUWMA / SCIENCE PHOTO LIBRARY
Melithaea sea fan, on a coral reef. Sea fans are also known as gorgonians. Each gorgonian polyp (too small to be seen here) feeds using tentacles which filter out plankton and particulate matter from the surrounding water. Photographed in the Andaman Sea, off the Similan Islands, Thailand.
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