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Chlorophyceae: Chlorococcales: Chlorococcaceae (Oocystaceae)

Tetraedron triangulare
Korschikoff var. triangulare

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: Unicells, planktonic; cell body flat, triangular in shape, (6-) 9-14 μm long; laterally concave or convex, ellipsoid in lateral view; angles rounded (sometimes with a knob-like small projections); cell wall covered with small granules (Photomicrographs of the Freshwater Algae, vol. 5, 1986).
Similar genus -->> Tetraedriella (Xanthophyceae); Goniochloris (Xanthophyceae);

Tetraedron triangulare Korschikoff var. triangulare, cell body 13 μm max. wide, with a single pyrenoid, x 640, Seseragi Park, Musashi-Urawa, Saitama city, Saitama Pref., Japan, August 2002 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Tetraedron Tetraedron

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