Species: Cell body small in size, 50-56 μm long, 22-23 μm wide, L/W=2-2.5,
slightly constricted at the center; semicells elongate ellipsoidal in shape, cell wall smooth;
chloroplast laminae ridged and radially arranged
(Illustrations of The Japanese Fresh-water Algae, 1977).
Similar species -->>C. cucurbita;Cosmarium oblongum Bennett ?,
cell body 44 μm long, 22 μm wide, L/W=, isthmus 20 μm wide,
x 640, standing water on a bank under Kurome-gawa-bashi (bridge), Kurome River, Asaka city, Saitama Pref., December 10, 2006, by Y. Tsukii
31 μm
63 μm
94 μm; x 640
Images of collecting locality:
standing water on a bank under Kurome-gawa-bashi (bridge), Kurome River, Asaka city, Saitama Pref., December 10, 2006, by Y. Tsukii