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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 var. divergens Nordstedt or intermediate type ?), cell body 25 μm long, 21 μm wide (excluding spines), L/W=1.2, isthmus 6 μm wide, spines up to 9 μm long, x 640, Tane-ike (pond), Togakushi highland, Shinano town, Nagano Pref., Japan, June 12, 2005 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Staurastrum cuspidatum Staurastrum cuspidatum
Cell body 25 μm long, 21 μm wide, L/W=1.2 (excluding spines), isthmus 6 μm wide, spines up to 9 μm long, x 640
Staurastrum cuspidatum Staurastrum cuspidatum Staurastrum cuspidatum Staurastrum cuspidatum

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