Cyanobacteria

Cyanobacteria Temporal range: 2700–0Ma Had'n Archean Proterozoic Pha.
Microscope eemage o Cylindrosperum, a genus o Cyanobacteria
Scientific classification
Domain:	Bacteria
(unranked):	Terrabacteria
(unranked):	Cyanobacteria-Melainabacteria group
Phylum:	Cyanobacteria Stanier, 1973
Cless:	Cyanophyceae
Orders
As o 2014 the taxonomy wis unner reveesion Chroococcales Chroococcidiopsidales Gloeobacterales Nostocales Oscillatoriales Pleurocapsales Spirulinales Synechococcales Incertae sedis †Gunflintia †Ozarkcollenia
Synonyms
Myxophyceae Wallroth, 1833 Phycochromaceae Rabenhorst, 1865 Cyanophyceae Sachs, 1874 Schizophyceae Cohn, 1879 Cyanophyta Steinecke, 1931 Oxyphotobacteria Gibbons & Murray, 1978

Cyanobacteria /saɪˌænoʊbækˈtɪəriə/, forby kent as Cyanophyta, is a phylum o bacteria that obtain thair energy throu photosynthesis. The name "cyanobacteria" comes frae the colour o the bacteria (Greek: κυανός (kyanós) = blue). Altho eften cried blue-green algae, that name is a misnomer as cyanobacteria are prokaryotic an algae are eukaryotic.

Bi producin oxygen as a gas as a bi-product o photosynthesis, cyanobacteria are thoucht tae hae convertit the early reducin atmosphere intae an oxidizing ane, which dramatically changed the composeetion o life furms on Yird bi stimulatin biodiversity an leadin tae the near-extinction o oxygen-intolerant organisms. Accordin tae endosymbiotic theory, the chloroplasts foond in plants an eukaryotic algae evolved frae cyanobacterial ancestors via endosymbiosis.