blue-green alga

== English == === Noun === blue-green alga (plural blue-green algae) Any member of the taxonomic class or phylum Cyanobacteria; a primitive photosynthetic organism similar to bacteria which is thought to have generated the first oxygen in the Earth's atmosphere. ==== Usage notes ==== The term alga is now considered improper scientific usage, since true algae are eukaryotic organisms, rather than bacteria. It remains in common use among aquarists and others, however. ==== Synonyms ==== cyanobacterium, BGA ==== Hypernyms ==== (bacterium called alga): alga, bacterium ==== Translations ==== === Further reading === Cyanobacteria on Wikipedia.Wikipedia Cyanobacteria on Wikispecies.Wikispecies Category:Cyanobacteria on Wikimedia Commons.Wikimedia Commons