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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Similar species -->> S. pseudosebaldi;
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
