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Gamophyceae: Zygnematales: Desmidiaceae

 Staurastrum cuspidatum
Brébisson var. cuspidatum
= Staurodesmus cuspidatus (Ralfs) Teiling var. cuspidatus (Coesel & Meesters, 2007)

Staurastrum 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 [ var. cuspidatum ]: Cell body (19.6-25.8)-31 μm long, (15.4-22.4)-28 μm wide, L/W=1.3, isthmus 4.2-7 μm wide; semicells inverted triangle in shape, apical and lateral margins slightly convexed, with a single elongated spine at each corner extended inward; apical view triangular, each side concaved, corners rounded (Illustrations of The Japanese Fresh-water Algae, 1977)
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Staurastrum cuspidatum Brébisson var. cuspidatum or similar species ?, cell body 19 μm long, 20 μm wide, L/W=, isthmus 8 μm wide, 4 spiny projections (up to 15 μm long) present in each semicell, x 640, Shimo-no-koike (pond), Shiga highland, Yamanouchi town, Nagano Pref., Japan, June 17, 2007 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Staurastrum cuspidatum Staurastrum cuspidatum Staurastrum cuspidatum Staurastrum cuspidatum Staurastrum cuspidatum Staurastrum cuspidatum Staurastrum cuspidatum

Images of collecting locality: Shimo-no-koike (pond), Shiga highland, Yamanouchi town, Nagano Pref., Japan, June 17, 2007 by Y. Tsukii

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