Subgenus: Entomum (Apical area deeply indented or notched)
Section: Excisa (Cell surface granulated or dented; apical area with spiny projections)
Species [var. elegans]:
Cell body (30-31)-36.5 μm long, (19-20)-22 μm wide,
constriction (6)-7 μm wide
(Illustrations of The Japanese Fresh-water Algae, 1977).
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