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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 (or C. oblongum Bennett ?), cell body 44 μm long, 24 μm wide, L/W=1.8, isthmus 21 μm wide, x 640, Gozaisho marsh, Hachimantai, Hachimantai city (formerly Matsuo village), Iwate Pref., Japan, July 16, 2005 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium Cosmarium

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