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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 ??, cell body 41 μm long, 25 μm wide, L/W=, x 640, standing water on a bank under Kurome-gawa-bashi (bridge), Kurome River, Hizaori-cho, Asaka city, Saitama Pref., April 20, 2008, by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium Cosmarium

Images of collecting locality: Standing water on a bank under Kurome-gawa-bashi (bridge), Kurome River, Hizaori-cho, Asaka city, Saitama Pref., April 20, 2008, by Y. Tsukii


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