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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