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Gamophyceae: Zygnematales: Desmidiaceae

Staurastrum connatum
var. pseudamericanum Grönblad
= Staurodesmus connatus (Lundell) Thomasson (Ling & Tyler, Australian Freshwater Algae, 2000)

Staurastrum connatum Species [ var. connatum ]: Cell body 22-24 μm long, 19.6-25 μm wide (excluding spines), isthmus 7-9 μm wide; spines short; semicells inverted semicircle in shape, apex flat or slightly convex.
[ var. pseudamericanum Grönblad ]: Cell body larger than v. connatum 39-45 μm long, 25-36.45 μm wide (excluding spines), isthmus 5.6-11 μm wide; corners of semicells protruded upward making its apex concave.
[ var. rectangulum Roy et Bisset ]: Cell body 14-20 μm long, 14.7-20 μm wide (without spines), isthmus 3.5-5.6 μm wide; side margins of semicells not convex; spines longer and thicker than v. connatum (Illustrations of The Japanese Fresh-water Algae, 1977)


Staurastrum connatum var. pseudamericanum Grönblad, (or S. curvatum W. West var. curvatum or S. aristiferum Ralfs var. indentatum ?), cell body 21 μm long, 15 μm wide (excluding spines), L/W=1.4, isthmus 5.5 μm wide, spiny projections about 5 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 Staurastrum
Cell body 18 μm long, 16 μm wide (excluding spines), L/W=1.1, isthmus 5 μm wide, spiny projections about 5 μm long, x 640
Staurastrum Staurastrum Staurastrum Staurastrum


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