Bursaria protozoan. Darkfield contrast micrograph of the large freshwater ciliate protozoan Bursaria truncatella. These protozoa are known as ciliates because they propel themselves through the water by beating tiny hair-like structures known as cilia. B. truncatella can reach up to 1 millimetre in length. Magnification: x60 when printed 10 centimetres wide.
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