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Diagnostic features

Unicellular (sometimes cells in pairs after division), with no thick mucilaginous envelope. Cells are large and usually bright blue-green, and have a thin mucilaginous margin surrounding them.  No chloroplasts or other organelles, but the cell centre often contains round granules or vesicles.

Typical habitats

The species pictured was from a clean water site


Kingdom Bacteria
Phylum Cyanobacteria
Class Cyanophyceae
Order Chroococcales
Family Synechococcaceae
Common name Cyanobacteria