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Gamophyceae: Zygnematales: Desmidiaceae

 Staurastrum iotanum
var. longatum Teiling

Staurastrum iotanum 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: with arm-like projections (Illustrations of The Japanese Fresh-water Algae, 1977)
Species [var. tortum]: Cell body with 2 arm-like projections, 11 μm long (excluding arms), 28 μm long (including arms), 28 μm wide (including arms), isthmus 4 μm wide (Illustrations of The Japanese Fresh-water Algae, 1977)

Staurastrum iotanum var. longatum Hirano (or S. biexcavatum ?), cell body 37 μm long, 45 μm wide, L/W=0.8 (including arms), cell body 15.5 μm long, 10 μm wide, L/W=1.6 (excluding arms), isthmus 6 μm wide, x 640, Shirahata-Numa, Urawa, Saitama Pref., Japan, November 20, 2005 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Staurastrum Staurastrum

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