Nitzschia sigmaformis
Hustedt
 
Genus: 
 
Species: 
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Nitzschia sigmaformis Hustedt, 
cell body 136 μm long, 8.5 μm wide, 
x 640, near Kitamoto nature observation park, Kitamoto city, Saitama Pref., January 22, 2005 by Y. Tsukii
 31 μm
 63 μm
 94 μm; x 640
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