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class Cyanobacteria, Cyanophyceae, class Cyanophyceae | photosynthetic bacteria found in fresh and salt water, having chlorophyll a and phycobilins; photosynthetic bacteria found in fresh and salt water, having chlorophyll a and phycobilins; once thought to be algae: blue-green algae ❲Cyanobacteria, Cyanophyceae❳ |