DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
Bryozoa sea moss. Light micrograph of a transverse section through a sea moss (phylum Bryozoa). This colonial marine invertebrate forms encrusting layers on stone and seaweeds. The colony consists of numerous small compartments (several seen here), with an individual organism (round sectioned elements) occupying each one. The anterior (front) of each animal (lophophore) has tentacles for feeding which lead to a mouth and its digestive system. The tentacles have cilia, which waft water into the mouth to obtain oxygen and filter out plankton for food. Magnification: x37 when printed at 10 centimetres wide.
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