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 small, (14-18)-22 μm long, (11-16.8)-22 μm wide,
isthmus (11-16.8)-22 μm wide;
(Illustrations of the Japanese fresh-water algae, 1977).
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