Dinoflagellate protozoan. Coloured scanning electron micrograph (SEM) of a Ceratium sp. dinoflagellate. Dinoflagellates are unicellular protozoans. About 90% are found in marine environments as plankton. They range in size from 2 millimetres to less than a hundredth of a millimetre across. Magnification: x1070 when printed at 10 centimetres wide.
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