Genus: Cells arranged three-dimentionally; cell body spherical or triangular pyramid in shape (Illustrations of The Japanese Fresh-water Algae, 1977). Species: Colonies of 8 or 4 cells connected with each other by gelatinous filaments, daughter colonies form a complex colony of 64 or 16 cells; cell body triangular pyramid in shape, 8-12 μm in diam.; (Illustrations of The Japanese Fresh-water Algae, 1977).

31 μm 63 μm 94 μm; x 640