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 [var. tortum]: Cell body with 2 arm-like projections, 11 μm long (excluding arms), 28 μm long (including arms), 28 μm wide (including arms), isthmus 4 μm wide (Illustrations of The Japanese Fresh-water Algae, 1977)

31 μm 63 μm 94 μm; x 640

Images of collecting locality: Kashiwa Village Mizube Park, Kashiwa city, Chiba Pref., Japan, February 11, 2008 by Y. Tsukii