Genus: Planktonic; colony of 2-8 cells surrounded by cell wall of their mother cell, but sometimes unicellular;
cell body broad ellipsoidal, both ends slightly pointed and with a thick cell wall;
1-3 chloroplasts parietal plate-like, with a single pyrenoid
(Guide book to the "Photomicrographs of the Freshwater Algae", 1998).
Species:
Cell body ellipsoid to broad-ellipsoid, with a slightly projected, thickened cell wall at both ends,
12-18 μm long, 8-16 μm wide;
2, 4, or 8 autospores enclosed within a enlarged mother cellwall;
chloroplasts 1-4, parietal laminate, each with a pyrenoid
(Photomicrographs of the Freshwater Algae, vol. 18, 1997).
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