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Gamophyceae: Zygnematales: Desmidiaceae

 Euastrum spinulosum
var. inermius Nordstedt

Euastrum spinulosum 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).

Euastrum spinulosum Delponte or similar species (spines inconspicuous, bays closed), similar to Cosmarium nastum, cell body 66 μm long, 60 μm wide, L/W=, x 640, rice field, Myoyo (Myouyou), Fukiage town, Saitama Pref., Japan, October 17, 2004 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
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