GERD GUENTHER / SCIENCE PHOTO LIBRARY GERD GUENTHER / SCIENCE PHOTO LIBRARY
Hypotrich protozoans. Differential interference contrast micrograph of Kerona pediculus ciliate hypotrich protozoans (oval) on the tentacle (horizontal) of a Hydra vulgaris hydrozoan. These protozoa are known as ciliates because they propel themselves through the water by beating tiny hair-like structures known as cilia. Magnification: x180 when printed 10 centimetres wide.
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