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 17-25 μm long, 17-25 μm wide (without spines), isthmus 5.6-8 μm wide, (Illustrations of The Japanese Fresh-water Algae, 1977)
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