Genus: Colonies of 4, 8 or 16 cells; planktonic; body crescent in shape; tapered at both ends;
cells attached to each other at dorsal surface; a chloroplast curved plate-like, with a
pyrenoid (Guide book to the "Photomicrographs of the Freshwater Algae", 1998).
Species: Cell body gradually tapered sharply pointed ends,
16-38 μm long, 5-8 μm wide, distances between apices 5-25
μm (Photocmicrographs of the Freshwater Algae, vol. 2, 1984).
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