 
 Nitzschia sigmaformis
Nitzschia sigmaformis
Hustedt
|  Genus: Species:
 | 
Nitzschia sigmaformis Hustedt ?, 
cell body 147 μm long, 7 μm wide, 
x 640, rice field near the boundary between Kabutoyama and Tamatsukuri, Osato town, Saitama Pref., Japan, October 17, 2004 by Y. Tsukii
 31 μm
 31 μm
 63 μm
 63 μm
 94 μm; x 640
 94 μm; x 640
 
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