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Chlorophyceae: Chlorococcaceae

 Planktosphaeria sp.

Planktosphaeria Genus: Unicellular or colonial within a gelatinous sheath; planktonic; cell body spherical; 1 or several chloroplasts cup-shaped, with a pyrenoid (Guide book to the "Photomicrographs of the Freshwater Algae", 1998).
Species:
Similar genus --> Dictyosphaerium

Planktosphaeria sp. (Chlorococcales, Chlorophyceae), cell body μm long, μm wide, a pyrenoid present, x 640, near Yanase river, Mizuko, Fujimi city, Saitama Pref., Japan, December 2003 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Planktosphaeria

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