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Gamophyceae: Zygnematales: Desmidiaceae

 Cosmarium succisum
W. et G.S. West var. succisum

Cosmarium succisum Genus: Unicellular; variable in shape; a constriction at the center of the cell body; mostly longer than wide; flattened; each semicell hemispherical, spherical, ellipsoidal, rectangular, pyramidal or kidney-shaped; no apical indentation (Illustrations of The Japanese Fresh-water Algae, 1977).
Species: Cell body small, 8.5-13 μm long, 7-12 μm wide, isthmus 2.8-4.3 μm wide; (Illustrations of the Japanese Fresh-water Algae, 1977).
Similar species -- >> C. norimbergense;

Cosmarium succisum W. et G.S. West var. succisum, cell body 11 μm long, 12 μm wide, L/W=0.9, isthmus μm wide, x 640, a water reservoir (pond) near Yamaguchi university, Yamaguchi city, Yamaguchi Pref., November 21, 2004, by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium

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