Family: Unicells or cells loosely attached to form hyphae; cell body varied in shape, a constriction at the center in
most species; cell walls consisting of two or more parts, with small pores and various ornaments
(Illustrations of The Japanese Fresh-water Algae, 1977).
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)