Cyanophyceae, commonly known as blue-green algae, refers to a group of photosynthetic microorganisms that are primarily aquatic and can be found in a variety of environments. They are prokaryotic organisms, meaning they lack a true nucleus, and are classified under the kingdom Bacteria. Cyanophyceae are known for their ability to perform photosynthesis using chlorophyll and can produce oxygen as a byproduct. They are often significant in ecosystems for their role in nitrogen fixation and as primary producers in aquatic food webs. Some species can form harmful algal blooms, leading to ecological and health concerns.
