|  Genus: 
Cell body flat, large, variable in shape, longer than wide; strong constriction at center; 
each semicell with several notches; cell wall with many short spines 
(Illustrations of The Japanese Fresh-water Algae, 1977). Species: 
Cell body 256-288 μm long, 192-258 μm wide, 
constriction 31-40 μm wide 
(Illustrations of The Japanese Fresh-water Algae, 1977).
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