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 [ var. subspeciosum ]:
Variety: Cell body 41-50 μm long, 29-36 μm wide;
isthmus 11-16 μm wide.
[ var. validius ]: Cell body 68-84 μm long, 47-53-(56) μm wide;
isthmus 17.5-22 μm wide
(Illustrations of the Japanese Fresh-Water Algae, 1977).
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