MAREK MIS / SCIENCE PHOTO LIBRARY MAREK MIS / SCIENCE PHOTO LIBRARY
Polarised light micrograph of Epistylis sp. protozoa. They are sessile (they cannot move about on their own), and bind to surfaces by secreting a cement-like substance. They feed using oral discs covered with cilia (microscopic hairs) which they use to draw food in. They are a common parasite on fish, binding to their scales or gills, and producing red sores. Magnification: x330 when printed 10 centimetres wide.
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