|  Genus: Unicellular, within a large spherical sheath; two equal-length flagella emerging from anterior end; 
cell body spherical or ellipsoidal, connected with gelatinous sheath by fine filaments; 
a single chloroplast cup-shaped, with several pyrenoids 
(Guide book to the "Photomicrographs of the Freshwater Algae", 1998). Species:
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