 
 Nitzschia sigmoidea
Nitzschia sigmoidea
(Nitzsch) W. Smith 1853
|  Genus: Species:
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Nitzschia sigmoidea (Nitzsch) W. Smith, 
cell body 290 μm long, 20 μm wide, 
x 400, x 640, a pond near Omiya gymnasium, Owada Park, Saitama city, Saitama Pref., Japan, April 3, 2005 by Y. Tsukii
 100 μm
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 200 μm
 300 μm; x 200
 300 μm; x 200
 
 
 
Cell body 295 μm long, 24 μm wide, 
x 400, x 640
 
 
 
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