Family: Colonies consisting of a fixed number of cells (Illustrations of The Japanese Fresh-water Algae, 1977).
Genus: Colonies composed of 16, 32, 64 or 128 (mostly 32) cells; 2-layered gelatinous envelope; mamillations anterior or posterior; cells spherical to ovoid with 2 equal-length apical flagella; eyespot present; sexual reproduction by anisogamy (Illustrated Guide, 1985).

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Colony ovoid or ellipsoid; each cells with many small pyrenoids
E. elegans 15 samples col. 50-138 μm 199?-2004	E. elegans 15 samples col. 50-138 μm 199?-2004	E. elegans 15 samples col. 50-138 μm 199?-2004	E. elegans 15 samples col. 50-138 μm 199?-2004
Colony ovoid or ellipsoid; each cell with a single pyrenoid
E. unicocca col. 108 x 90 μm cells 13-16 μm Matsumoto Nagano, 2001	E. unicocca col. 42 x 36 μm cells 9 μm Ikenokochi marsh Tsuruga Fukui, 2004
Colony cylindrical; each cell with a large and surrounding small pyrenoids
E. cylindrica col. 35 x 27 μm near Karakemi m. Omachi Nagano, 2005	E. cylindrica col. 75 x 50 μm cell 11 μm φ Japan, 1997	E. cylindrica? or E. elegans ? col. 35 x 27 μm Furuyakami Kawagoe Saitama, 2004	E. cylindrica ? st. Gmt-11, axenic col. 80 x 68 μm cells 12-14 μm Gunma, 2001
E. cylindrica ? col. 52 x 45 μm cells 10 μm Ikenokochi marsh Tsuruga Fukui, 2004	E. cylindrica ? col. 58 x 45 μm cells 10-12 μm stock Gmt-13, axenic Gunma, 2001
Colony ellipsoid; cellls of anterior chaplet smaller than others
E. illinoisensis col. 140 x 105 μm cells 12, 17 μm φm near Todoroki g.l. Kawasaki Kanawaga, 2004	E. illinoisensis ? col. 180 x 150 μm cells 18-20 μm φm Yokonuma Sakado Saitama, 2004	Eudorina sp. col. 138 x 105 μm cells 11-19 μm Tatebayashi Gunma, 2001	Eudorina sp. parasitic amoeba ? cells 11-19 μm Tatebayashi Gunma, 2001

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