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

31 μm 63 μm 94 μm; x 640

Images of collecting locality: No. 2, Ohdo-ike park, Chuo-ku, Chiba City, Chiba Pref., Japan, December 24, 2007 by Y. Tsukii