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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 about 20 μm long (excluding spines), μm wide, L/W=, isthmus μm wide, x 640, No.2, Near Omine-numa (pond/marsh), Omine, Minakami town (formerly Tsukiyono town), Gunma Pref., Japan, October 12, 2008 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Staurastrum connatum Staurastrum connatum

Images of collecting locality: No.2, Near Omine-numa (pond/marsh), Omine, Minakami town (formerly Tsukiyono town), Gunma Pref., Japan, October 12, 2008 by Y. Tsukii


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