Subgenus: Atomum (Apical area slightly depressed)
Section: Retusa (Cell body large; granulated dome(s) at the center of each semicell )
Species: Cell body (73-95)-114 μm long, (65-77)-92 μm wide,
constriction (14-21)-22 μm wide
(Illustrations of The Japanese Fresh-water Algae, 1977).
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