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 15-(18-32)-34 μm long,
11.5-(12.6-22.4)-23 μm wide, L/W=1.5, isthmus 2.8-8 μm wide,
semicells half-ellipsoidal or rounded pyramidal, apices slightly depressed,
cell wall with a small number of dots; a single chloroplast with a pyrenoid in each semicell
(Illustrations of The Japanese Fresh-water Algae, 1977).
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