Picocyanobacteria are cyanobacteria that are part of the picoplankton, which is the fraction of plankton composed by cells between 0.2 and 2 μm.
[1] Picocyanobacteria comprise the smallest photoautotrophs.
[2] Freshwater picocyanobacteria genera include Synechococcus, Cyanobium, and Synechocystis,[3] and marine picocyanobacteria genera are represented primarily by Synechococcus and Prochlorococcus.
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