GEORGETTE DOUWMA / SCIENCE PHOTO LIBRARY GEORGETTE DOUWMA / SCIENCE PHOTO LIBRARY
Sea squirts on coral. Stalked green ascidians or grape tunicates (Oxycorynia fascicularis) attached to a reef. Sea squirts filter plankton from the water current which circulates through them. They are sedentary but have free-swimming larvae. Ascidian sea squirts are characterized by a tough outer layer of the polysaccharide tunicin, unlike other tunicates which are less rigid. Photographed off Rinca Island, Indonesia.
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