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Nematode worm. Coloured scanning electron micrograph (SEM) showing the mouth of an unidentified nematode worm (order Enoplida). This marine invertebrate possesses glands behind its mouth which secrete digestive enzymes. It is a poor swimmer, requiring contact with a substrate in order to move. Magnification: x4,500 at 6x7cm size. x7,425 at 4x5ins (KEYSTONE/SCIENCE PHOTO LIBRARY/DAVID SCHARF)