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Chlorophyceae: Volvocales: Volvocaceae
Volvocica: Volvocina: Goniidae

Tetrabaena socialis
(Dujardin) Nozai et Ito 1994
Syn: Gonium sociale (Dujardin) Warming 1876

Gonium Genus: Flattened colonies of 4 cells embedded in gelatinous sheaths; cells nearly sphearical, with two flagella of equal length, a stigma and two contractile vacuoles; a single chloroplast cup-shaped, with a single or several pyrenoids; asexual reproduction by autocolony formation, each cell divides into a daughter colony; sexual reproduction isogamous (Photomicrographs of the Freshwater Algae, vol. 2, 1984). Species: Colonies consisting of 4 cells, up to 20-50 μm in width; cell body pear-shaped, up to 10-22 μm long, 6-16 μm wide. (Photomicrographs of the Freshwater Algae, vol. 2, 1984).

Gonium sociale (Dujardin) Warming , cell body μm long, 11 μm wide (left), cell body 11 μm long, 9 μm wide (right), x 640, Senganpi Suigo Park, Saitama city, Saitama Pref., Japan, January 9, 2005 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Gonium Gonium Gonium

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