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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 Staurastrum reinschii Roy f. minor Borge ?), cell body 21 μm long, 21 μm wide (excluding spiny projections, 4 μm), L/W=1.0, isthmus 7 μm wide, x 640, Maimeno-ike (pond), Norikura highland, Azumi, Matsumoto city (formerly Azumi village), Nagano Pref., Japan, June 8, 2006 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Staurastrum Staurastrum Staurastrum

Images of collecting locality: Maimeno-ike (pond), Norikura highland, Azumi, Matsumoto city (formerly Azumi village), Nagano Pref., Japan, June 8, 2006 by Y. Tsukii

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