Subgenus: Entomum (Apical area deeply indented or notched)
Section: Incisa (Cell surface smooth; apical area without spiny projections)
Species [var. dideltoides ]:
Cell body 56-90 μm long, 31-50 μm wide, isthmus 7-14 μm wide,
(Illustrations of the Fresh-water Algae, 1977).
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