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Gamophyceae: Zygnematales: Desmidiaceae

Staurastrum connatum
(Lundell) Roy et Bisset var. connatum
= 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 (Lundell) Roy et Bisset var. connatum or S. megacanthum var. scoticum W. et G.S. West ?, cell body 33 μm long (excluding spines), μm wide, L/W=, isthmus μm wide, x 640, No.1, a small pond along Prefectural road route 272 (Tsukiyono-Sarugakyo-Onsen-sen, 36°41'43"N, 138°57'56"E), Tsukiyono, Minakami 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 Staurastrum connatum Staurastrum connatum

Images of collecting locality: No.1, a small pond (Sumano-simo-tameike) near Prefectural road route 272 (Tsukiyono-Sarugakyo-Onsen-sen), Tsukiyono, Minakami town, Gunma Pref., Japan, October 12, 2008 by Y. Tsukii


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