|  Genus: Colonies of 4, 8, 16 or 32 cells in a gelatinous sheath; cell body long cylindroid, 
strongly curved or twisted, both ends rounded; a chloroplast full within the cell;  
a single pyrenoid  
(Guide book to the "Photomicrographs of the Freshwater Algae", 1998). Species: Colonies of 4-32 cells within a gelatinous matrix, cells crescent in shape, 
termini rounded, 8-12 μm long, 
3-6 μm wide 
(Illustrations of The Japanese Fresh-water Algae, 1977).
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