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Cyanophyceae: Chroococcales: Chroococcaceae
Cyanophyceae: Chroococcales: Merismopediaceae

 Coelosphaerium sp.

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 μm long, μm wide, x 640, Numappara marsh, Nasu-shiobara city (formerly Kuroiso city), Tochigi Pref., Japan, August 2003 by Y. Tsukii
scale 50 μm scale 100 μm scale 150 μm; x 400
Coelosphaerium Coelosphaerium

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