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. minus]:
Cell body (66-112)-120 μm long, (50-60)-64 μm wide,
isthmus (48-56)-59 μm wide,
(Illustrations of The Japanese Fresh-water Algae, 1977).
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