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Chlorophyta: Gamophyceae: Zygnematales: Desmidiaceae

Staurastrum senarium
(Ehrenberg) Ralfs

Genus: Cell body short, radiate in shape; apical view of the cell, triangular, polygonal, ellipsoidal or spindle-shaped; zygospores formed outside of mother cells (Illustrations of The Japanese Fresh-water Algae, 1977)
Subgenus: lacks arm-like projections (Illustrations of The Japanese Fresh-water Algae, 1977)
Species: Cell body 21-31 μm (excluding projections), 29-36 μm (including projections), 27-34 μm wide (including projections), constriction 8.4-12 μm wide (Illustrations of The Japanese Fresh-water Algae, 1977)

Staurastrum senarium (Ehrenberg) Ralfs (identified by Rupert Lenzenweger), tape No. 0040, time code 0628, cell body 33 μm long, 24 μm wide, L/W = 1.4, isthmus 10.5 μm wide, Hiroshima University, Hiroshima Pref., Japan, September 28, 1998 by Y. Tsukii

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