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).

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C. turgidum var. turgidum 198 x 82 μm Higashi-sano Hakuba Nagano, 2004

C. turgidum var. ovatum 214 x 80 μm Kinu-fureai beach Utsunomiya Tochigi, 2004

C. turgidum var. ovatum 212 x 78 μm 203 x 93 μm Univ. A.V.M. Obihiro Hokkaido, 2005

Similar species -->> C. clevei (Actinotaenium); C. maculatum (Cyclidium);

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