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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 E. sinuosum var. ceylanicum W. et G.S. West ?), cell body 78 μm long, 36 μm wide, L/W=2.2, isthmus 9 μm wide, x 640, Maimeno-ike (pond), Norikura highland, Azumi, Matsumoto city (formerly Azumi village), Nagano Pref., Japan, June 8, 2006 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Euastrum
Cell body 81 μm long, 38 μm wide, L/W=2.1, isthmus 9 μm wide, x 640
Euastrum Euastrum

Images of collecting locality: Maimeno-ike (pond), Norikura highland, Azumi, Matsumoto city (formerly Azumi village), Nagano Pref., Japan, June 8, 2006 by Y. Tsukii

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