Cyanobacteria
Cyanobacteria is a phylum of bacteria that obtain their energy through photosynthesis. The name «cyanobacteria» comes from the color of the bacteria (Greek: κυανός (kyanós) = blue). They are often called blue-green algae, but some consider that name a misnomer, as cyanobacteria are prokaryotic whereas algae are eukaryotic.
The first cells on Earth were similar to these organims, by producing gaseous oxygen as a byproduct of photosynthesis, cyanobacteria are thought to have converted the early reducing atmosphere into an oxidizing one, causing «rusting of the Earth»and dramatically changing the composition of life forms on Earth by stimulating biodiversity and leading to the near-extinction of oxygen-intolerant organisms.
(misnomer/ nombre equivocado)
Chains of cyanobacteria seen through an optical microscope
Silviapvadi's Blog 