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. oblongum;
C. cucurbita;
C. cucurbitinum;
C. diplosporum;
C. globosum;
Cosmarium thwaitesii Ralfs ??,
cell body 48 μm long, 23 μm wide, L/W=2.1, isthmus 20 μm wide,
x 640, No.8, a marsh pond at Sensho-ga-hara, near Akita-komagadake (mountain), Shizukuishi town, Iwate Pref., Japan, August 6, 2007 by Y. Tsukii
31 μm
63 μm
94 μm; x 640
Images of collecting locality:
No.8, a marsh pond at Sensho-ga-hara, near Akita-komagadake (mountain), Shizukuishi town, Iwate Pref., Japan, August 6, 2007 by Y. Tsukii