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Gamophyceae: Zygnematales: Desmidiaceae

 Cosmarium zonatum
P. Lundell

Cosmarium zonatum Subgenus: 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:

Cosmarium zonatum P. Lundell ?? (section Eudysphinctium), cell body 44 μm long, 21 μm wide, isthmus 9 μm wide, x 640, Omine-numa (pond/marsh), Omine, Minakami town (formerly Tsukiyono town), Gunma Pref., Japan, May 25, 2006 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium zonatum Cosmarium zonatum
Cell body 49 μm long, 23 μm wide, isthmus 10 μm wide, x 640
Cosmarium zonatum

Images of collecting locality: No.5/6, Omine-numa (pond/marsh), Omine, Minakami town (formerly Tsukiyono town), Gunma Pref., Japan, May 25, 2006 by Y. Tsukii

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