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 22-(26-34)-43.5 μm long, 21-(23.7-31)-37.5 μm wide; constriction 7.5-(8.4-9.8)-12 μm wide; cell wall smooth (Illustrations of the Fresh-water Algae, 1977).
Images of collecting locality:
Koyama River near Joetsu-shinkansen railway bridge, Kurizaki, Honjo city, Saitama Pref., Japan, April 15, 2006 by Y. Tsukii