Bacteria
The largest known species of bacterium is Thiomargarita namibiensis, which grows to 0.75 mm (0.03 in) in diameter, making it visible to the naked eye and up to a million times the size of more typical bacteria.
Cyanobacteria, one of the largest "blue green algae" is Lyngbya, whose filamentous cells can be 50 μm wide.
Read more about this topic: Largest Organisms
Famous quotes containing the word bacteria:
“To the eyes of a god, mankind must appear as a species of bacteria which multiply and become progressively virulent whenever they find themselves in a congenial culture, and whose activity diminishes until they disappear completely as soon as proper measures are taken to sterilise them.”
—Aleister Crowley (1875–1947)