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: lacks arm-like projections (Illustrations of The Japanese Fresh-water Algae, 1977)
Species:

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S. brebissonii 40 x 45 μm Ikei-no-ike Nasu Tochigi, 2006	stock Tnik-1 40-42 x μm Ikei-no-ike Nasu Tochigi, 2006	S. brebissonii 45 x 40 μm East of Tojuro Azuma mountains Yamagata, 2007	S. brebissonii 42 x 39 μm Kowashimizu Suwa Nagano, 2007
S. brebissonii or S. trapezicum ? μm Tone river Tsukiyono Gunma, 2003	S. brebissonii or S. trapezicum ? 42 x 37 μm near Karakemi m. Omachi Nagano, 2005
S. brebissonii x 47 μm Hyoutan-ike Shiga highland Nagano, 2007	S. brebissonii μm Shijuhachi-ike 2 Shiga highland Nagano, 2008	S. brebissonii 50 x 50 μm Maeyama marsh Shiga highland Nagano, 2007	S. brebissonii μm Maeyama marsh Shiga highland Nagano, 2008

Similar species --> > S. brebissonii (=S. pilosum); S. kouwetsii; S. teliferum; S. hirsutum (shorter than 50 μm);

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