 
 Nitzschia sigmoidea
Nitzschia sigmoidea
(Nitzsch) W. Smith 1853
|  Genus: Species:
 | 
Nitzschia sigmoidea (or N. obtusa), 
cell body  μm long,  μm wide, 
x 640, Daidarabotchi-ike (or Daizahoshi-ike), Iizuna-kogen (Iizuna Highland), Nagano city, Nagano Pref., Japan, September 2003, by Y. Tsukii
 31 μm
 31 μm
 63 μm
 63 μm
 94 μm; x 640
 94 μm; x 640
 
 
 
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