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:
C. repandum
19 x 14.5 μm
Imou bog
Toyohashi
Aichi, 2004
C. repandum
15.5 x 13 μm
Aquatic botanical g.
Sawara
Chiba, 2004
C. repandum
20 x 17 μm
Nagaike park
Hachioji
Tokyo, 2005
C. repandum
19 x 16 μm
Lake Shirakaba
Tateshina & Chino
Nagano, 2005
C. repandum
22 x 18 μm
Junichogata s.k.
Himi
Toyama, 2006
C. repandum ?
21 x 13 μm
Kumakubo
Nasu-shiobara
Tochigi, 2005