Characteristics: Prokaryotic, but only distantly related to the other domain of prokaryotes, the Archaea
Cyanobacteria
are photosynthetic organisms with both photosystems I and II, hence, evolves oxygen. Cyanobactera have chlorophyll a only, and store cyanophycean starch.
Link to Cyanobacteria image collection
Link to a movie of a motile filament of Oscillatoria impacting a diatom
Link to a movie of a motile filament of Oscillatoria - darkfield
Heterocysts are specialized cells that fix nitrogen.
Stromatolites are a fossils formed by the bacterial mats of Cyanobacteria