Arthrospira  Arthrospira is a genus of free-floating filamentous cyanobacteria characterized by cylindrical, multicellular trichomes in an open left-hand helix. A dietary supplement is made from "A. platensis" and "A. maxima", known as spirulina. The "A. maxima" and "A. platensis" species were once classified in the genus "Spirulina". Although the introduction of two separate genera ["Arthrospira" and "Spirulina"] is now generally accepted, there has been much dispute in the past and the resulting taxonomical confusion is tremendous. The common name, spirulina, refers to the dried biomass of "A. platensis", which belongs to the oxygenic photosynthetic bacteria that cover the groups Cyanobacteria and Prochlorales. These photosynthetic organisms, Cyanobacteria, were first considered as algae until 1962 and for the first time, these blue-green algae were added to prokaryote kingdom and proposed to call these microorganisms as Cyanobacteria  where algae are considered to be a very large and diverse group of eukaryotic organisms. This designation was accepted and published in 1974 by "Bergey's Manual of Determinative Bacteriology". Scientifically, quite a distinction exists between "Spirulina" and "Arthrospira" genera. Stizenberger, in 1852, gave the name "Arthrospira" based on the septa presence, helical form, and multicellular structure, and Gomont, in 1892, confirmed the aseptate form of the genus " Spirulina". Geitler in 1932 reunified both members designating them as "Spirulina" without considering the septum. The worldwide research on microalgae was carried out in the name of "Spirulina", but the original species exploited as food with excellent health properties belongs to genus "Arthrospira". This common difference between scientists and customers is difficult to change. However, current taxonomy claims that the name S"pirulina" for strains which are used as food supplements is inappropriate, and agreement exists that "Arthrospira" is a distinct genus, consisting of over 30 different species, including "A. platensis" and "A. maxima". The genus "Arthrospira" comprises helical trichomes of varying size and with various degrees of coiling, including tightly coiled morphology to even a straight form.