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 medium in size, elliptical hexagon, slightly longer than width, (48-56)-60 μm long,
(39-48)-50 μm wide, isthmus 14-17 μm wide;
semicells semicircular with flattened apex or trapezoid, both sides wavy (about 8 waves),
apex flat or slightly convex, side view broad ovoid
(Illustrations of The Japanese Fresh-water Algae, 1977).
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