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 forming 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).