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Gamophyceae: Zygnematales: Desmidiaceae

 Cosmarium thwaitesii
Ralfs

Cosmarium thwaitesii 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 (or C. oblongum Bennett ?), cell body 40 μm long, 24 μm wide, L/W=1.7, isthmus 21.5 μm wide, x 640, No.6, a marsh pond at Sensho-ga-hara, near Akita-komagadake (mountain), Shizukuishi town, Iwate Pref., Japan, August 6, 2007 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium thwaitesii Cosmarium thwaitesii
Cell body 41.5 μm long, 22 μm wide, L/W=1.9, isthmus 20 μm wide, x 640
Cosmarium thwaitesii Cosmarium thwaitesii

Images of collecting locality: No.6, a marsh pond at Sensho-ga-hara, near Akita-komagadake (mountain), Shizukuishi town, Iwate Pref., Japan, August 6, 2007 by Y. Tsukii

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