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Synechococcus is a unicellular cyanobacterium that is very wide spread in the marine environment. Its size varies between 0.8 and 1.5 µm. The photosynthetic coccoid cells are preferentially found in surface well lit waters where this bacterium can be very abundant (generally from 1,000 to 200,000 of cells by milliliter). Many freshwater genera of Synechococcus have also been described.