Nitzschia sigmaformis
Hustedt
 
Genus: 
 
Species: 
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Nitzschia sigmaformis Hustedt ?, 
cell body 90 μm long, 6 μm wide, L/W=15, 
x 640, rice field, near Ichinoseki Railroad Station, Ichinoseki city, Iwate Pref., Japan, July 24, 2005 by Y. Tsukii
 31 μm
 63 μm
 94 μm; x 640
Cell body 165 μm long, 7 μm wide, L/W=23.6, x 640
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