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 [ var. reniforme ]:
Cell body medium in size, slightly longer than width, (47-56)-57 μm long,
(32-34.4)-38-40 μm wide, isthmus 15-(17)-20 μm wide;
semicells reniform, side view circular, apical view elliptical; cell wall covered with granules
(Illustrations of The Japanese Fresh-water Algae, 1977).
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