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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. cucurbita; C. cucurbitinum; C. diplosporum; C. globosum; C. oblongum;

Cosmarium thwaitesii Ralfs, cell body μm long, μm wide, isthmus μm wide, L/W=, x 640, Hakama marsh (or bog), Madarao highland (Niigata & Nagano Pref.), Myoko village, Niigata Pref., Japan, May 15, 2005 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium thwaitesii Cosmarium thwaitesii
Cell body 33 μm long, 16 μm wide, isthmus 14 μm wide, L/W=2.1, x 640
Cosmarium thwaitesii
Cell body 34 μm long, 17 μm wide, isthmus 14 μm wide, L/W=2.0, x 640
Cosmarium thwaitesii Cosmarium thwaitesii Cosmarium thwaitesii
Cell body 30 μm long, 16 μm wide, isthmus 13 μm wide, L/W=1.9, x 640
Cosmarium thwaitesii Cosmarium thwaitesii

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