 
 
|  Genus: Cell body crescent in shape (long, curved, tapered at both ends); cross section rounded; 
cell wall smooth or with longitudinal lines, bands on the cell wall in some species; 
chloroplast laminae ridged and radially arranged, which makes cross section star-shaped; 
pyrenoids aligned or scattered (Illustrations of The Japanese Fresh-water Algae, 1977). 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
 
 
 
 
 
 
