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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 ? or similar species, cell body 10-13 μm wide, spiny projections 7 μm long, x 640, Shiba river, near Owada Park, Saitama city, Saitama Pref., Japan, April 3, 2005 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
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