 
 Nitzschia sigmoidea
Nitzschia sigmoidea
(Nitzsch) W. Smith 1853
|  Genus: Species:
 | 
Nitzschia sigmoidea, 
cell body 300 μm long, 18 μm wide, 
x 200, x 400, Japan, 1998 by Y. Tsukii
 100 μm
 100 μm
 200 μm
 200 μm
 300 μm; x 200
 300 μm; x 200
 
 50 μm
 50 μm
 100 μm
 100 μm
 150 μm; x 400
 150 μm; x 400
 
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