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Gamophyceae: Zygnematales: Desmidiaceae or Closteriaceae

 Closterium navicula
(Brébisson) Lütkemüller

Closterium navicula Species: Cell body not curved, spindle or boat in shape; 24-(35-84)-93 μm long, 8-(11-20)-22 μm wide; L/W = 3-4; a single chloroplast and 1 or 2 pyrenoids in each semicell (Illustrations of The Japanese Fresh-water Algae, 1977).

Closterium navicula (Brébisson) Lütkemüller, cell body 55 μm long, 13 μm wide, x 640, Tane-ike (pond), Togakushi highland, Shinano town, Nagano Pref., Japan, May 21, 2006 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Closterium navicula Closterium navicula
Cell body 59 μm long, 14.5 μm wide, x 640
Closterium navicula

Images of collecting locality: Tane-ike (pond), Togakushi highland, Shinano town, Nagano Pref., Japan, May 21, 2006 by Y. Tsukii

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