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Gamophyceae: Zygnematales: Desmidiaceae

 Staurastrum iotanum
var. tortum 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 Wolle var. longatum Hirano ?, cell body 29 x 34 μm (including arms), 10 x 8 μm wide (excluding arms), L/W=1.3 (excluding arms), arms up to 15 μm long, isthmus 5.5 μm wide, x 640, Hasu-ike (pond), Shiga highland, Yamanouchi town, Nagano Pref., Japan, June 19, 2005 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Staurastrum iotanum

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