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, (21-29.5)-36 μm long, (15.4-18)-26 μm wide,
isthmus 5-(5.6-7)-9 μm wide, L/W=1.5; both sides of semicells with four wavy margins,
all waves equal in size, side view elongated ellipsoid; cell wall smooth
(Illustrations of The Japanese Fresh-water Algae, 1977).
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