 
 
|  Genus: Species: | 
 50 μm
 50 μm
 100 μm
 100 μm
 150 μm; x 400 :
 150 μm; x 400 : 
 31 μm
 31 μm
 63 μm
 63 μm
 94 μm; x 640
 94 μm; x 640
 
 
 
 
Navicula (cryptocephala or lanceolata), 
cell body 74 μm long, 17 μm wide, 
x 400, x 640, April 1999, Japan by Y. Tsukii
 50 μm
 50 μm
 100 μm
 100 μm
 150 μm; x 400
 150 μm; x 400
 
