|  Genus: Unicellular; two equal-length flagella emerging from anterior end; 
cell body flat, broad ovoidal, lateral view spindle-shaped, within a gelatinous sheath quadrangular in shape; 
a single chloroplast plate-like, with 4-6 pyrenoids 
(Guide book to the "Photomicrographs of the Freshwater Algae", 1998). Species:
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