|  Genus: Colony of 4, 8 or 16 cells, within a gelatinous sheath, which is spherical or ellipsoidal in shape; 
cell body broad crescent in shape, both ends rounded; 
a single chloroplast plate-like in shape, with a pyrenoid 
(Guide book to the "Photomicrographs of the Freshwater Algae", 1998). Species:
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