Subgenus: Atomum (Apical area slightly depressed)
Section: Retusa (Cell body large; granulated dome(s) at the center of each semicell)
Species (var. inermius):
Cell body 53-70 μm long, 47.6-59 μm wide,
constriction 11-17 μm wide
(Illustrations of The Japanese Fresh-water Algae, 1977).
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