GEORGETTE DOUWMA / SCIENCE PHOTO LIBRARY GEORGETTE DOUWMA / SCIENCE PHOTO LIBRARY
Ink-spot sea squirts (Polycarpa aurata, yellow and purple) on a reef. Sea squirts, or tunicates, are sessile barrel-shaped animals that feed by filtering plankton from the water. Photographed off Misool, Raja Ampat, West Papua, Indonesia.
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