Genus:
Subgenus: with arm-like projections
(Illustrations of The Japanese Fresh-water Algae, 1977)
Section: Hoplastrum (Apexes of semicells with projections; arm-like projections granulated or dented). Species: cell body excluding spines 28-44 μm long, 62-73 μm wide (with spines), constriction 85-15 μm wide, (Illustrations of The Japanese Fresh-water Algae, 1977)
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