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: cell body without spines 28-44 μm long, 62-73 μm wide (with spines), constriction 85-15 μm wide, (Illustrations of The Japanese Fresh-water Algae, 1977)