|  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). |