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 octagonal in shape, 23-24 μm long, 17-18 μm wide, isthmus 5.6 μm wide,
L/W=1.4; semicells nearly hexagonal; cell wall smooth; apical view elliptical
(Illustrations of The Japanese Fresh-water Algae, 1977).
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