Species: Cell body spherical in shape, 12-21 μm in diam. (zygote 14-16 μm); a small conical papilla present; a spherical pyrenoid located near posterior end; stigma circular or slightly elliptical in shape, located anterior half of the cell surface; a nucleus anterior (Süßwasserflora von Mitteleuropa 9, Chlorophyta I, 1983).

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C. simplex ? 11-14 x 8-14 μm papilla present Hasuda Saitama, 2002

C. simplex ? 13 x 12 μm papilla present Ranzan Saitama, 2004

C. simplex ? 16 x 11.5 μm papilla present Kurome river Asaka Saitama, 2004

Similar genus -> Chloromonas; Chlorococcum;

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