STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Ciliate protozoan. Coloured scanning electron micrograph (SEM) of a Paramecium cilliate protozoan. Protozoa are a type of unicellular animal. The ciliates are so named because of the hair-like cilia surrounding their bodies which are used for locomotion and sweeping in food. Their diet consists mainly of bacteria and other food particles, drawn into the body through an oral groove. They live in water and are typically invisible to the naked eye, although the largest ciliate can reach a length of 2 millimetres. Magnification: x2000 when printed 10 centimetres wide.
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