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.
Subgenus: Cell body cylindrical or dumbbell-shaped, dorso-ventrally not compressed, transverse section circular (Illustrations of The Japanese Fresh-water Algae, 1977).
C. elegantissimum
61 x 26 μm
Karakemi marsh
Omachi
Nagano, 2006
C. elegantissimum
64 x 25 μm
Nozomiko 2
Iiyama
Nagano, 2007
