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Chlorophyceae: Chlorococcales: Chlorococcaceae (Oocystaceae)

 Tetraedron caudatum
(Corda) Hansgirg var. incisum Lagerheim

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 [ var. incisum ]:
Similar genus -->> Tetraedriella (Xanthophyceae); Goniochloris (Xanthophyceae);

Tetraedron caudatum (Corda) Hansgirg var. incisum Lagerheim, cell body μm long, μm wide, x 640, Akigase Park, Saitama city, Saitama Pref., Japan, March 2002 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 caudatum Tetraedron caudatum Tetraedron caudatum Tetraedron caudatum

Tetraedron caudatum (Corda) Hansgirg var. caudatum: Unicells, planktonic; cell body flat, pentagonal in shape, 6-23 μm in diam.; four sides concave, remaining one deeply incised, sometimes narrowly V- or U-shaped; each corner rounded with a single, straight spine, 3-4 μm long (Photomicrographs of the Freshwater Algae, vol. 6, 1987).

Tetraedron caudatum (Corda) Hansgirg var. longispinum Lemmermann:

* Tetraedron caudatum (Corda) Hansgirg var. incisum Lagerheim:

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