Genus: Unicellular; variable in shape; a constriction at the center of the cell body;
mostly longer than wide; flattened; each semicell hemispherical, spherical, ellipsoidal,
rectangular, pyramidal or kidney-shaped; no apical indentation
(Illustrations of The Japanese Fresh-water Algae, 1977).
Species:
cell body 35 μm long,
24 μm wide,
constriction 12.6 μm wide,
cell surface with laterally 6 wavy up-and-down
(Illustrations of The Japanese Fresh-water Algae, 1977).