DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
Sea squirt (Botryllus schlosseri) under a rock in a rock pool. Sea squirts are chordates and are a primitive link between invertebrates and vertebrates. Adult sea squirts live a sedentary life attached to a sub- strate such as rock. They are barret shaped and feed by filtering plankton from the water. Photographed in Abbotsham, Devon, England.
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