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Gamophyceae: Zygnematales: Desmidiaceae

 Staurastrum sp.

Staurastrum 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)
Subgenus: lacks arm-like projections (Illustrations of The Japanese Fresh-water Algae, 1977)
Species:

Staurastrum sp. (each corner similar to that of S. hexacerum Section Processiformes), cell body 29 μm long, 28 μm wide, L/W=1.0, isthmus 10 μm wide, x 640, riverside at Satsunai river, Obihiro city, Hokkaido, Japan, October 15, 2005 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Staurastrum Staurastrum Staurastrum Staurastrum Staurastrum Staurastrum Staurastrum Staurastrum

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