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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, cell body μm long, μm wide, L/W=, isthmus μm wide, x 640, Block 4, Kashibaru marsh, Karatsu city, Saga Pref., Japan, September 9, 2008 by Y. Tsukii
Arthrodesmus 31 μm Arthrodesmus 63 μm Arthrodesmus 94 μm; x 640
Staurastrum connatum Staurastrum connatum

Images of collecting locality: Block 4, Kashibaru marsh, Karatsu city, Saga Pref., Japan, September 9, 2008 by Y. Tsukii


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