STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Dinoflagellate. Coloured scanning electron micrograph (SEM) of a Protoperidinium sp. marine dinoflagellate. Dinoflagellates are unicellular protozoans. About 90% are found in marine environments as plankton. They are characterised by the presence of two flagella (not visible). One flagellum beats back and forth, while the other is flat and ribbon-like, and works as a rudder to steer and rotate the organism.
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