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 63 μm long, 21.5 μm wide, L/W=, isthmus 18 μm wide,
x 640, No.4, Shijuhachi-ike (pond), Shiga highland, Yamanouchi town, Nagano Pref., Japan, October 9, 2006 by Y. Tsukii
31 μm
63 μm
94 μm; x 640
Images of collecting locality:
No.4, Shijuhachi-ike (marsh pond), Shiga highland, Yamanouchi town, Nagano Pref., Japan, October 9, 2006 by Y. Tsukii