Subgenus: Entomum (Apical area deeply indented or notched)
Section: Excisa (Cell surface granulated or dented; apical area with spiny projections)
Species: Cell body 36-43 μm long, 27-28 μm wide,
L/W=1.3, constriction 8-9 μm wide
(Illustrations of The Japanese Fresh-water Algae, 1977).
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