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, 8.5-13 μm long, 7-12 μm wide, isthmus 2.8-4.3 μm wide;
(Illustrations of the Japanese Fresh-water Algae, 1977).
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