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Chlorophyceae: Chlorococcales: Chlorococcaceae (Oocystaceae)

 Tetraedron trigonum
(Nägeli) Hansgirg var. trigonum

Tetraedron trigonum 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 (or qadrangular) in shape; laterally concave, 20-30 μm long; corners tapered into straight or slightly curved spines, 4-6 μm long; cell wall smooth (Photomicrographs of the Freshwater Algae, vol. 1, 1984).
Similar genus -->> Tetraedriella (Xanthophyceae); Goniochloris (Xanthophyceae);

Tetraedron trigonum var. trigonum or T. regulare var. incus Teiling f. major Prescott ? (or Tetraedriella, Xanthophyceae, Heterokonta ?), cell body 33 μm long, x 640, Bessho-numa, Saitama Pref., Japan, June 2001 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Tetraedron Tetraedron Tetraedron Tetraedron

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