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: cell body 41 μm long, 473 μm wide (with spines), constriction 13 μm wide, (Illustrations of The Japanese Fresh-water Algae, 1977)

50 μm 100 μm 150 μm; x 400 :

Images of collecting locality: No.2, Dojo-ike (pond), Norikura highland, Azumi, Matsumoto city, Nagano Pref., Japan, November 4, 2007 by Y. Tsukii