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Chlorophyceae: Chlorococcales: Chlorococcaceae (Oocystaceae)

 Tetraedron tumidulum
(Reinsch) Hansgirg

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: Cell body pyramidal in shape, 10-18 μm in diam.; each side concave, rarely straight or convex; each angle rounded; cell wall smooth (Photomicrographs of the Fresh-water Algae, vol. 2, 1984).
Cell body 20-35 μm wide (Illustrations of The Japanese Fresh-water Algae, 1977).
Similar genus -->> Tetraedriella (Xanthophyceae); Goniochloris (Xanthophyceae);

Tetraedron tumidulum (or Goniochloris fallax, Pleurochloridaceae, Mischococcales, Xanthophyceae ??), cell body triangular in shape, 11 μm long, each side slightly concave, x 640, Shinobazu-ike (pond), Ueno, Taito-ku, Tokyo, Japan, March 2001 by Y. Tsukii
scale 50 μm scale 100 μm scale 150 μm; x 400 : scale 31 μm scale 63 μm scale 94 μm; x 640
Tetraedron tumidulum Tetraedron tumidulum Tetraedron tumidulum

Tetraedron tumidulum (Reinsch) Hansgirg: Cell body pyramidal in shape, 10-18 μm in diam.; each side concave, rarely straight or convex; each angle rounded; cell wall smooth (Photomicrographs of the Fresh-water Algae, vol. 2, 1984).

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