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).
Species: Unicells, planktonic; cell body irregular tetrahedron in shape, 25-30 μm in diam.; laterally concave; angles extended into two processes, each process branched into two short banchlets (5-8 μm long) with two or three short spines (Photomicrographs of the Freshwater Algae, vol. 1, 1984).