Genus: Unicellular; variable in shape; a constriction at the center of the cell body;
mostly longer than wide; flattened; each semicell hemispherical, spherical, ellipsoidal,
rectangular, pyramidal or kidney-shaped; no apical indentation.
Subgenus [ Dysphinctium ]:
Cell body cylindrical or dumbbell-shaped, dorso-ventrally not compressed, transverse section circular .
Section [ Actinotaenium ]:
Cell body cylindrical, slightly constricted at the center, cell surface smooth or dotted or punctated
(Illustrations of The Japanese Fresh-water Algae, 1977).
Species:
Cell body cylindrical ellipsoid, slightly constricted at the center,
60-(68-76)-79 μm long, 40-(43-54) μ wide, isthmus 38-(41-52) μm wide;
semicells semi-elliptical, slightly flattened at the apex, with 2 pyrenoids
(Illustrations of The Japanese Fresh-water Algae, 1977).
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