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 [ var. ellipsoideus ]: (Illustrations of The Japanese Fresh-water Algae, 1977).
S= length of Spines; L=Body length; W=Body width (terminal cells)

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L/W = about 2, terminal cells ellipsoidal
S. ellipsoideus 4-cells type cell 24 x 12 μm L/W=2 S/L= Uruguay, 1999	S. ellipsoideus cell 20 x 7 μm L/W=2.9 S/L=0.8 Nasu Tochigi, 2001	S. ellipsoideus 8-cells type cell 18 x 9 μm L/W=2 S/L= Uruguay, 1999	S. ellipsoideus stock Tnk-1, axenic cell 17 x 8 μm L/W=2.1 S/L= Tochigi, 2001
S. ellipsoideus cell 15 x 6.5 μm cell 19 x 8 μm L/W=2.3, 2.4 S/L=0.87, 0.79 Urawa Saitama, 2001	S. ellipsoideus stock Smt-1 cell 17 x 8 μm Urawa Saitama, 2001	S. ellipsoideus cell 27 x 11 μm L/W=2.5 S/L=0.67 Saitama, 1999	S. ellipsoideus ?? stock Smt-1, axenic cell 18 x 11 μm L/W=1.6 S/L= Urawa Saitama, 2001
S. ellipsoideus ?? stock Smt-1, axenic dividing cells Urawa Saitama, 2001	S. ellipsoideus cell 12 x 6 μm L/W=2.0 Ageo Maruyama Park Saitama, 2002	S. ellipsoideus 9-11 x 4-6 μm L/W= Senganpi suigo p. Sakura-ku Saitama, 2005	S. ellipsoideus cell 9 x 5 μm L/W=1.8 Kasuga Fukuoka, 2001
S. ellipsoideus cell 18 x 7 μm L/W=2.6 S/L=0.7 Ushiroya Park Toda Saitama, 2002	S. ellipsoideus cell μm L/W= Numappara marsh Kuroiso Tochigi, 2003	S. ellipsoideus cell μm L/W= Iruma River Tsurugashima Saitama, 2003	S. ellipsoideus cell μm L/W= Kamisuwa r.w.st. Suwa Nagano, 2005
S. ellipsoideus cell 10-13 x 7 μm L/W= Omoi river Oyama Tochigi, 2006

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