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Chlorophyceae: Chlorococcales: Oocystaceae

Ankistrodesmus falcatus
(Corda) Ralfs

Ankistrodesmus Genus: Colonies of 4-32 cells; cell body long crescent or spindle in shape, tapered at both ends; cells attached with each other at the center of the body, paralleled or radially arranged; no gelatinous sheath; a chloroplast; no pyrenoids; planktonic (Guide book to the "Photomicrographs of the Freshwater Algae", 1998).
Species: Cell body needle-shaped, tapered to the sharply pointed ends, slightly twisted or curved, 25-100 μm long, 1.5-6 μm wide; a single chloroplast parietal, plate-like, usually without pyrenoids (Photomicrographs of the Freshwater Algae, 1985). 25-30 μm long, 2-3 μm wide (Illustrations of The Japanese Fresh-water Algae, 1977).
Similar Genus ->> Monoraphidium; Selenastrum;


Ankistrodesmus falcatus (Corda) Ralfs, cell body 60-65 μm long, 1-1.5 μm wide, x 640, Southern lakeside of Lake Shirakaba, Tateshina town & Chino city, Nagano Pref., Japan, May 21, 2005 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Ankistrodesmus falcatus Ankistrodesmus falcatus

* Ankistrodesmus falcatus (Corda) Ralfs: 25-30 μm long, 2-3 μm wide (Illustrations of The Japanese Fresh-water Algae, 1977).

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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