Species of the genus Arthrospira have been isolated from alkaline brackish and saline waters in tropical and subtropical regions. Among the various species included in the genus Arthrospira, A. platensis is the most widely distributed and is mainly found in Africa but also in Asia. Arthrospira maxima is believed to be found in California and Mexico. It should be noted that the taxonomic distinction between these two species is based mainly on ultrastructural and morphological differences, some of which are hardly a distinctive feature in view of the morphological elasticity of these species under different growth and stress conditions. The recent 16s rRNA sequence data on 52 strains collected from various regions have revealed only two clusters with species from the various geographical areas represented in both clusters.
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