Ink-spot sea squirt (Polycarpa aurata, blue) and a crinoid (right) amongst coral. Sea squirts are sessile barrel-shaped animals that feed by filtering plankton from the water. Crinoids feed by filtering food particles from the water using their feathery arms, the hairs of which pass food to a central mouth. Photographed in the Banda Sea, off Moluccas, Indonesia.
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