Subgenus: Entomum (Apical area deeply indented or notched)
Section: Incisa (Cell surface smooth; apical area without spiny projections)
Species: Cell body 125-137 μm long, 48-50 μm wide, L/W=2.5,
isthmus 19-20 μm wide;
(Illustrations of The Japanese Fresh-water Algae, 1977).
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