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Gamophyceae: Zygnematales: Desmidiaceae

Euastrum ansatum

Subgenus: Entomum (Apical area deeply indented or notched)
Section: Incisa (Cell surface smooth; apical area without spiny projections)

Species [var. ansatum ]: Cell body medium in size, elongate pyramid-shaped, side margins cocaved, 87-95 μm long, 39-42 μm wide, L/W=2, isthmus 11-14 μm wide; cell wall dotted, with 5 bulges conspicous (2 central, 3 basal) (Illustrations of The Japanese Fresh-water Algae, 1977).
[var. dideltiforme ]: Cell body 81-109 μm long, 42-53 μm wide, constriction 11-15 μm wide; semicells tapered to terminal lobe, anterior lateral lobes slightly developed
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