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: Cell body 31-47 μm long (excluding spines), 31-47 μm wide, L/W=1.25, isthmus 11-15 μm (Illustrations of The Japanese Fresh-water Algae, 1977)

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S. hirsutum 45 x 40 μm Hikage marsh Shiga highland Nagano, 2005	S. hirsutum ?? x 40 μm Mida-ga-hara Gassan (mt.) Yamagata, 2006	S. hirsutum Numa-no-hara m. Madarao highland Niigata, 2006	S. hirsutum 23 x 21 μm Tanohara marsh Shiga highland Nagano, 2005
S. hirsutum or S. monticulosum ? 33 x 30 μm Tanohara marsh Shiga highland Nagano, 2005	S. hirsutum or S. monticulosum ? 34 x 33 μm Tanohara marsh Shiga highland Nagano, 2004	S. hirsutum or S. monticulosum ? μm Kuroyachi marsh Hachimantai Iwate, 2007	S. hirsutum μm Sensho-ga-hara Shizukuishi Iwate, 2007
S. hirsutum ? 26 x 24 μm Ukishima marsh Tsugaike highland Nagano, 2005	S. hirsutum ? 22 x 21 μm Shibu-ike Shiga highland Nagano, 2005

Similar species --> > S. kouwetsii (=S. pilosum, longer than 50 μm);

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