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: (Illustrations of The Japanese Fresh-water Algae, 1977)
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S. tetracerum ?
30 x 50 μm
Murakuni ike
Iwatsuki-ku
Saitama, 2006
S. tetracerum ?
33 x 40 μm
Shakujii Park
Tokyo, 2001
S. tetracerum
f. trigona ?
13 x 12 μm
Sayama park
Higashi-Murayama
Tokyo, 2006
S. tetracerum
f. trigona ?
20 x 18 μm
Kashibaru marsh 5
Karatsu
Saga, 2006
S. tetracerum
f. trigona ?
?? x 20 μm
Omine-numa
Minakami
Gunma, 2006
S. tetracerum
f. trigona ?
21 x 26 μm
Sensho-ga-hara
Shizukuishi
Iwate, 2007
