Genus: Colonies of 4 (or 2, 8, 16) cells attached side by side, arranged linearly or zigzag; cell body elliptical or spindle or crescent in shape; terminal cells with spiny projections in many species; cell wall usually smooth, but in some species granulated or dented or ridged (Illustrations of The Japanese Fresh-water Algae, 1977).
Species: Cells attached side by side along 3/4 of their side (arranging in 1 or 2 rows), inner spaces absent (cf. S. arcuatus); cell body ellipsoidal or ovoid without spiny or dented projections, 7-20 μm long, 4-10 μm in diam. (Illustrations of The Japanese Fresh-water Algae, 1977).

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v. ecornis ? cell 16 x 5 μm cell 16 x 4 μm cell 12 x 2 μm Japan, 1997	v. ecornis ? cell μm Mizuko Fujimi Saitama, 2003	v. ecornis ? or S. minutus ? stock Cka-2 Agricultural p. Kashiwa Chiba, 2002	v. ecornis ? 18 x 6-10 μm near Ayu river Fujioka Gunma, 2004
v. ecornis ? 15 x 5-6 μm Sagiyama m.p. Saitama Saitama, 2005	v. ecornis ? 12 x 11 μm Kowashimizu Suwa Nagano, 2005	v. ecornis ? 13 x 3 μm Ushidome-ike Norikura highland Nagano, 2005	v. ecornis ? 12 x 5 μm Tanohara marsh Shiga highland Nagano, 2005
v. disciformis or S. arcuatus ? cell 12 x 6.5 μm Kawashima or Kawajima Saitama, 2002	v. disciformis or S. arcuatus ? cell 11 x 5.5 μm Kasama Park Ibaraki, 2002	v. disciformis or S. arcuatus ? cell 9 x 5 μm near Town Hall Shobu Saitama, 2004	v. disciformis or S. arcuatus ? cell 12 x 5 μm Saitama, 1999
v. disciformis or S. arcuatus ? cell 11 x 5.5 μm Uruguay, 1999	v. disciformis or S. arcuatus ? cell 11 x 6 μm Dewa Park Saitama, 2001	v. disciformis or S. arcuatus ? cell 8 x 5 μm Nishi-Urawa Saitama, 2001	v. disciformis or S. arcuatus ? cell 9 x 4.5 μm Kabuto-yama Nishi-no-miya Hyogo, 2004
v. disciformis or S. arcuatus ? cell 10 x 6 μm Kejo-numa 2 Osaki Miyagi, 2006	v. disciformis or S. arcuatus ? cell 10-11 x 5-65 μm Omotsubo marsh Tetta-cho Okayama, 2004	v. disciformis or S. arcuatus ? cell 9 x 3.5 μm near Yamaguchi Univ. Yamaguchi, 2004	v.disciformis f . obiciturus ? cell μm Tsuki river Ranzan Saitama, 2003

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