Cyanophyceae, commonly known as cyanobacteria, is a phylum of bacteria that obtain their energy through photosynthesis. These microorganisms are often referred to as blue-green algae due to their color, which results from the presence of chlorophyll and phycocyanin pigments. Cyanophyceae are found in a wide range of environments, including freshwater, marine, and terrestrial ecosystems, and play a crucial role in the nitrogen cycle and as primary producers in aquatic food chains. Some species can form harmful algal blooms that produce toxins.
