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Chlorophyceae: Chlorococcales: Oocystaceae

 Selenastrum gracile
Reinsch

Selenastrum gracile 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 13-30 μm long, 3-5 μm wide (Photomicrographs of the Freshwater Algae, vol. 2, 1984).
Similar Genus ->> Kirchneriella; Ankistrodesmus; Selenodictyum;

Selenastrum sp., cell body strongly curved, 25 μm long, 3.5 μm wide, x 400, x 640, Saitama Pref., Japan, October 1999, by Y. Tsukii
scale 50 μm scale 100 μm scale 150 μm; x 400 : scale 31 μm scale 63 μm scale 94 μm; x 640
Selenastrum Selenastrum

Ankistrodesmus gracilis (Reinsch) Korshikov (Syn: Selenastrum gracile Reinsch): A colony of 8-32 cells, cells crescent in shape, 10-15 μm long, 3-5 μm wide, a single flattened chloroplast and a pyrenoid (Illustrations of The Japanese Fresh-water Algae, 1977).

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