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Gamophyceae: Zygnematales: Desmidiaceae

 Staurastrum contectum
Turner var. inevolutum Turner

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 contectum Turner var. inevolutum Turner (Section Spinastrum) or similar species ?, cell body 36 μm long, 34 μm wide, L/W=1.1, isthmus 10 μm wide, x 640, Onnenai, Kushiro marsh, Kushiro city, Hokkaido, Japan, October 16, 2005 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Staurastrum Staurastrum Staurastrum Staurastrum

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