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 46 μm long, 32 μm wide, isthmus 10 μm wide,
L/W=1.3; semicells semicircular with a flattened apex, both sides slightly wavy (5-7 waves);
cell wall dotted (Illustrations of The Japanese Fresh-water Algae, 1977).
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