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Description of Arthrospira

Arthrospira filaments are usually in large, screw-like coils that do not have a mucous sheath. They may be solitary and free-floating plankton or grouped into slimy benthic clumps colored blue- green, olive-green, or reddish-brown. Each trichome is cylindrical, isopolar, and may be long or short. Arthrospira is usually nonmotile, but occasionally glides with a rotating motion. Each  cell has visible cross walls and special pore patterns in the cell wall, including a row of pores circling  the cell. The apical or end cells are rounded or cylindrical and may have calyptras or thickened walls. The thylakoids are arranged radially or in a whirled pattern. A few species have gas vesicles. Arthrospira maxima and A. fusiformis are also known as Spirulina platensis and cultivated commercially.

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