FRANK FOX / SCIENCE PHOTO LIBRARY FRANK FOX / SCIENCE PHOTO LIBRARY
Dinoflagellates, light microscopy. Dinoflagellates are unicellular protozoans. About 90 per cent are found in marine environments as plankton, but they also occur widely in fresh water. They range in size from 2 millimetres to less than a hundredth of a millimetre across, and move about by means of two whip-like flagella.
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