Species: Cell body 58-75 μm long, 26.5-31 μm wide, L/W=2-2.5,
isthmus 20-29 μm wide; semicells broad ellipsoidal or ovoidal, apex broad circular or
narrowly flattened; cell wall finely dotted; band-form chloroplasts aligned along inner cellwall
(Illustrations of The Japanese Fresh-water Algae, 1977).
Similar species -->>C. cucurbita;
C. cucurbitinum;
C. diplosporum;
C. globosum;
C. oblongum;
Cosmarium thwaitesii Ralfs ??,
cell body 36 μm long, 22 μm wide, L/W=1.6, isthmus 19 μm wide,
x 640, No. 7, Midagahara (bog/marsh), Tate-yama (Moutain), Tateyama town, Toyama Pref., Japan, August 23, 2006, by Y. Tsukii 31 μm
63 μm
94 μm; x 640
Images of collecting locality:
No. 7, Midagahara (bog/marsh), Tate-yama (Moutain), Tateyama town, Toyama Pref., Japan, August 23, 2006, by Y. Tsukii