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Cyanophyceae: Chroococcales: Chroococcaceae
Cyanophyceae: Chroococcales: Merismopediaceae

 Coelosphaerium sp.

Coelosphaerium Order & Family: Floating unicells or a colony embedded in a matrix; no differentiation of apical and base structures; only one family.
Genus: A spherical colony in which radial filamentous structure absent (Illustrations of The Japanese Fresh-water Algae, 1977).

Coelosphaerium sp., cell body spherical, 2-2.5 μm in diam., x 640, rice field, near City Hall, Fujimi city, Saitama Pref., Japan, July 11, 2004 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Coelosphaerium Coelosphaerium

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