Genus: Planktonic; colony of 4 cells; cell body spherical, covered with elongated spiny projections;
cells attached with each other arranging cruciform on a plane, with a small space at the center of the colony;
a single chloroplast plate-like, with a pyrenoid
(Guide book to the "Photomicrographs of the Freshwater Algae", 1998).
Species:
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