Species: Cell body ellipsoidal or nearly spherical, 10-22 μm long, 8-22 μm wide; papilla absent; flagella 1.5-2 times longer than body length; chloroplast cup-shaped; a pyrenoid located at posterior half of the cell; stigma around equator, circular or elliptical in shape; nucleus anterior; sexual reproduction by isogamy; zygote surface smooth, colored red (Süßwasserflora von Mitteleuropa 9, Chlorophyta I, 1983).

31 μm 63 μm 94 μm; x 640