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Gamophyceae: Zygnematales: Desmidiaceae

 Cosmarium turgidum
Brébisson var. ovatum Nordstedt
= Actinotaenium turgidum (Brébisson) Teiling var. ovatum Nordstedt

Cosmarium turgidum 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 [ var. trugidum ]: Cell body (165-215)-220 μm long, (75-86)-100 μ wide, isthmus (58-77)-84 μm wide.
[ var. ovatum ]: Cell body 154-200 μm long, 67-77 μ wide, isthmus 42-45 μm wide.
(Illustrations of The Japanese Fresh-water Algae, 1977).
Similar species -->> C. clevei (Actinotaenium); C. maculatum (Cyclidium);

Cosmarium turgidum var. ovatum Nordstedt, cell body 214 μm long, 80 μm wide, L/W=2.7, x 640, Kinu-fureai beach near Kinu River, Utsunomiya city, Tochigi Pref., Japan, November 28, 2004 by Y. Tsukii
scale 50 μm scale 100 μm scale 150 μm; x 400 : scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium turgidum Cosmarium turgidum Cosmarium turgidum

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