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: (Photomicrographs of the Freshwater Algae, vol. 15, 1995).

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S. ovalternus or S. obtusus ? cell 14 x 8.5 μm Uruguay, 1999	S. ovalternus or S. obtusus ? cell 12 x 6 μm Sue-machi Fukuoka, 2001	S. ovalternus or S. obtusus ? cell 9 x 6.5 μm Mizumoto Park Tokyo, 2001	S. ovalternus cell μm Higusa-numa Hikari Chiba, 2003
S. ovalternus cell 11 x 7 μm Tane-ike Togakushi highland Nagano, 2005	S. ovalternus cell 13 x 9 μm Kumakubo Nasu-shiobara Tochigi, 2005

Similar species -->> S. tibiscensis;

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