Species: Cell body large, 65-94 μm long, 48-67 μm wide, L/W=1.3,
isthmus 14-27 μm wide;
semicells semielliptical or ovoidal pyramid in shape; cellwall covered with large granules showing crenulated margins,
7 granules present between apical and basal corners; apex flattened with 4 granules
(Illustrations of The Japanese Fresh-water Algae, 1977).
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