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Gamophyceae: Zygnematales: Desmidiaceae

 Euastrum ansatum
var. pyxidatum Delponte

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).
Species [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

Euastrum ansatum var. pyxidatum Delponte (or var. dideltiforme Ducellier ?), semicell 50 μm long (cell body 100 μm long), 51 μm wide, L/W=, x 640, Imori pond, Myoko-kogen (Myoko highland), Myoko village, Niigata Pref., Japan, November 7, 2004 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Euastrum ansatum Euastrum ansatum

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