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Gamophyceae: Zygnematales: Desmidiaceae

 Staurastrum avicula
Brébisson in Ralfs var. subarcuatum (Wolle) W. et. G.S. West

Staurastrum avicula 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: lacks arm-like projections (Illustrations of The Japanese Fresh-water Algae, 1977)
Species:

Staurastrum avicula Brébisson in Ralfs var. subarcuatum (Wolle) W. et. G.S. West (or C. echinatum Brébisson ?), cell body 24 μm long, 26 μm wide, isthmus 8 μm wide, spiny projections at corner 3 μm long, x 640, Karakemi marsh, Yasaka, Omachi city (formerly Yasaka village), Nagano Pref., Japan, May 8, 2006 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Staurastrum avicula Staurastrum avicula Staurastrum avicula Staurastrum avicula

Images of collecting locality: Karakemi marsh, Yasaka, Omachi city (formerly Yasaka village), Nagano Pref., Japan, May 8, 2006 by Y. Tsukii

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