|  Genus: Planktonic; unicellular or colony of 4, 8, or 16 cells; both cells and its colony covered with layers of mucous sheath; 
cell body spherical; cell wall smooth; a single chloroplast star-shaped, with a pyrenoid located at the center  
(Guide book to the "Photomicrographs of the Freshwater Algae", 1998). Species:
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