Phylum Cyanonta
The Phylum Cyanonta consists of cyanobacteria. They are commonly found in environments that are high in dissolved oxygen and release oxygen as a by-product of their photosynthesis. Excess photosynthetic products are stored as cyanophycean starch and oils. The photosynthetic activity of this bacteria accounts for a major proportion of the production of ocean matter and oxygen in the ocean.
Cyanobacteria are sometimes referred to as blue-green bacteria. These photosynthetic prokaryotes contain chlorophyll a and some others contains chlorophyll b. These pigments mostly absorb red and blue wavelengths of the spectrum and reflect green wavelengths. This defines the color of their cells. The pigments use the light absorbed to convert the light energy into chemical energy.
Cyanobacteria can live as isolated cells or form colonies of dense mats or long filaments.