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Arthrospira
''Arthrospira'' is a genus of free-floating filamentous cyanobacteria characterized by cylindrical, multicellular trichomes in an open left-hand helix. There is a dietary supplement made from ''Arthrospira platensis'' and ''Arthrospira maxima'', known as Spirulina. The ''maxima'' and ''platensis'' species were once classified in the genus ''Spirulina''. There is now agreement that they are in fact ''Arthrospira''; nevertheless, and somewhat confusingly, the older term ''Spirulina'' remains in use for historical reasons.〔〔 ''Arthrospira platensis'' and ''Arthrospira maxima'' occur naturally in tropical and subtropical lakes with high pH and high concentrations of carbonate and bicarbonate. ''Arthrospira platensis'' occurs in Africa, Asia and South America, whereas ''Arthrospira maxima'' is confined to Central America and Arthrospira pacifica is endemic to Hawaii Islands of America.〔Vonshak, A. (ed.). ''Spirulina platensis (Arthrospira): Physiology, Cell-biology and Biotechnology.'' London: Taylor & Francis, 1997.〕 Most cultivated spirulina is produced in open channel raceway ponds, with paddle-wheels used to agitate the water.〔 The largest commercial producers of spirulina are located in the United States, Thailand, India, Taiwan, China, Pakistan, Burma (a.k.a. Myanmar), Greece and Chile.〔 == See also ==
* Spirulina (genus)
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