Genus: Unicells, planktonic; cell body spherical, surrounded by many elongated spiny projections,
1/3 from their base thickened, remainings hairly; a single chloroplast cup-shaped, with a pyrenoid
(Guide book to the "Photomicrographs of the Freshwater Algae", 1998).
Species: Cell body spherical, 8-15 μm in diam., spiny projections 30-38 μm long
(Introduction to the Freshwater Algae, 1999).
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