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:

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S. protuberans cell 30 x 6 μm L/W=6 S/L=1.2 Japan, 1997	S. protuberans cell 24 x 6 μm near Ayu river Fujioka Gunma, 2004	S. protuberans cell 15 x 3 μm L/W=5 S/L=1.0 199?-2001	S. protuberans cell 18 x 5.5 μm L/W=3.3 S/L=0.8 Uruguay, 1999
S. protuberans or S. opoliensis ? cell 18 x 5.5 μm L/W=3.3 S/L=1.0 Otawara Tochigi, 2000	S. protuberans cell 21 x 8 μm L/W=2.6 S/L=0.9 Dewa p., Koshigaya Saitama, 2001	S. protuberans cell 19-20 x 6.5 μm L/W=2.9-3.1 S/L=1.0 Koshigaya Saitama, 2001	S. protuberans or S. opoliensis ? cell 18 x 5 μm L/W=3.6 S/L=1.1 Bessho numa Saitama, 2001
S. protuberans or S. opoliensis ? cell 16 x 5 μm L/W=3.2 S/L=1.1 Koshigaya Saitama, 2001	S. protuberans cell 13 x 3.5 μm L/W=3.7 S/L=1.1 ??, 2000	S. protuberans cell 18 x 3 μm L/W=6.0 S/L=0.9 Abiko Chiba, 2000	S. protuberans cell 16 x 5 μm L/W=3.2 S/L=0.9 Matsumoto Nagano, 2001
S. protuberans or S. opoliensis ? cell 19 x 5 μm L/W=3.8 S/L=0.8 Abiko Chiba, 2000	S. protuberans cell μm L/W= S/L= O-ike park Yabuki Fukushima, 2003	S. protuberans cell 20 x 5 μm L/W= S/L= Sannoh park Nishi-ku Saitama, 2004	S. protuberans cell 17 x 4 μm L/W=4.3 S/L=0.9 Koriyama Fukushima, 2001
S. protuberans cell 20-22 x 5 μm L/W= S/L= Noda Namegawa Saitama, 2004	S. protuberans ? or S. quadricauda ? L/W= Sannoh-bori Sannoh Park Saitama, 2005

Similar species -->> S. opoliensis; S. quadricauda;

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