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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);

Teraedron tumidulum (Reinsch) Hansgirg or Tetraedriella jovetii Bourrelly large variety or Tetraedriella laevis ?, cell body 25 μm long, 24 μm wide, chloroplasts parietal, disc-shaped, many (more than 30 ?), x 640, Hasu-ike (pond), Shiga highland, Yamanouchi town, Nagano Pref., Japan, June 19, 2005 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
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Tetraedriella jovetii (Bourrelly) Bourrelly (Syn. Pseudostaurastrum jovetii Bourrelly): Cell body 10-12 μm in size; chloroplasts 5-9 in number (Süßwasserflora von Mitteleuropa 3, Xanthophyceae 1, 1978).

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