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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 5 μm long, 3-4 μm wide, L/W=1.25-1.67, x 640, Ko-numa (pond/marsh), Tsukiyono town, Gunma Pref., Japan, April 15, 2007 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Coelosphaerium Coelosphaerium Coelosphaerium Coelosphaerium

Coelosphaerium sp., cell body 5 μm long, 3 μm wide, L/W=1.7, x 640, Ko-numa (pond/marsh), Tsukiyono town, Gunma Pref., Japan, April 15, 2007 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Coelosphaerium Coelosphaerium

Images of collecting locality: Ko-numa (pond/marsh), Minakami town (formerly Tsukiyono town), Gunma Pref., Japan, April 15, 2007 by Y. Tsukii

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