Nitzschia sigmaformis
Hustedt
 
Genus: 
 
Species: 
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Nitzschia sigmaformis Hustedt ?, 
cell body 85 μm long, 6 μm wide, 
x 640, rice field, Myoyo (Myouyou), Fukiage town, Saitama Pref., Japan, October 17, 2004 by Y. Tsukii
 31 μm
 63 μm
 94 μm; x 640
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