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Gamophyceae: Zygnematales: Desmidiaceae

 Cosmarium sp.

Cosmarium globosum Subgenus [ Dysphinctium ]: Cell body cylindrical or dumbbell-shaped, dorso-ventrally not compressed, transverse section circular.
Section [ Eudysphinctium ]: Cell body dumbbell-shaped, constriction strong, cell surface smooth, dotted or punctated (Illustrations of The Japanese Fresh-water Algae, 1977).
Species: (Illustrations of The Japanese Fresh-water Algae, 1977).

Cosmarium sp., cell body 86 μm long, 60 μm wide, L/W=1.4, isthmus 38 μm wide, cell wall similar to that of C. pachydermum (Section Cyclidium, Subgenus Eucosmarium), x 640, a small pond at Obihiro University of Agriculture and Veterinary Medicine, Obihiro city, Hokkaido, Japan, October 13, 2005 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium Cosmarium Cosmarium

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