Genus: Cell body short, radiate in shape; apical view of the cell, triangular, polygonal, ellipsoidal or spindle-shaped; zygospores formed outside of mother cells (Illustrations of The Japanese Fresh-water Algae, 1977)
Subgenus: with arm-like projections (Illustrations of The Japanese Fresh-water Algae, 1977)
Species: Cell body 67-75.6 μm long (excluding spines), 84 μm (including spines), 67-92 μm wide, isthmus 16.8-19.5 μm wide (Illustrations of The Japanese Fresh-water Algae, 1977)

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S sebaldi 79-82 x 85-90 μm near Ichinose-enchi Norikura highland Nagano, 2005

S sebaldi 76 x 90 μm Maimeno-ike Norikura highland Nagano, 2006

S sebaldi 73 x 80 μm near Ichinose-enchi Norikura highland Nagano, 2006

S sebaldi μm Ko-numa 1 Minakami Gunma, 2008

Similar species -->> S. pseudosebaldi;

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