Species [ var. simonyi ]:
Cell body 19-24 μm long, 18-25 μm (excluding spines),
isthmus 6-7.5 μm wide,
6 short spines at each side of trianglur semicell in top view
[ var. sparse-aculeatum (Schmidle) Hirano ]:
Cell body 19.6-23.7 μm long (excluding spines), 19.6-19.8 μm wide
(excluding spines), isthmus 5.6-7.7 μm wide, spines equal in length
(Illustrations of The Japanese Fresh-water Algae, 1977)
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