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Chlorophyceae: Chlorococcales: Chlorococcaceae (Oocystaceae)

 Tetraedron regulare
Kützing var. regulare

Tetraedron Genus: Cell body short, radiate in shape; apical view of the cell, triangular, polygonal, ellipsoidal or spindle-shaped; zygospores formed outside of mother cells (Illustrations of The Japanese Fresh-water Algae, 1977).
Species:
Similar genus -->> Tetraedriella (Xanthophyceae); Goniochloris (Xanthophyceae);

Tetraedron regulare ?, cell body μm long, μm wide, x 640, O-ike (pond), O-ike park, Yabuki town, Fukushima Pref., Japan, August 2003, by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Tetraedron regulare Tetraedron regulare

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