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Chlorophyta: Gamophyceae: Zygnematales: Desmidiaceae

Euastrum ansatum
Ehrenberg var. ansatum

Genus: Variable in shape and in size; mostly longer than wide; strong constriction at center; semicell pyramid-shaped, apically flattened with indentation (or notch, some species lack this notch); laterally straight or wavy or indented; one chloroplast in each semicell; one pyrenoid for each chloroplast (Illustrations of The Japanese Fresh-water Algae, 1977).
Subgenus: Entomum (Apical area deeply indented or notched)
Section: Incisa (Cell surface smooth; apical area without spiny projections)

Species [var. ansatum ]: Cell body 87-95 μm long, 39-42 μm wide, L/W=2, constriction 11-14 μm wide (Illustrations of The Japanese Fresh-water Algae, 1977).

Euastrum ansatum, tape No. 0062, time code 0130, cell body 88 μm long, 44 μm wide, isthmus μm wide, Hiroshima Pref., Japan, October 1998 by Y. Tsukii

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