Subgenus: With arm-like projections
(Illustrations of The Japanese Fresh-water Algae, 1977)
Species: Cell body 25-36 μm long, 25-36 μm wide (including spines),
isthmus 8.4-9.7 μm wide; constriction medium, bay-opening large;
(Illustrations of The Japanese Fresh-water Algae, 1977)
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