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Gamophyceae: Zygnematales: Desmidiaceae

Euastrum spinulosum
Delponte

Subgenus: Atomum (Apical area slightly depressed)
Section: Retusa (Cell body large; granulated dome(s) at the center of each semicell)

Species: Cell body 64.5-75.3 μm long, 56-64.5 μm wide, constriction 14-17 μm wide (Illustrations of The Japanese Fresh-water Algae, 1977).
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