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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 ??, cell body nearly spherical, 6 μm in diam., with a pyrenoid, x 640, Iruma river, Kami-terayama, Kawagoe city, Saitama Pref., Japan, January 18, 2004 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Planktosphaeria

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