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Chlorophyceae: Volvocales: Volvocaceae
Volvocica: Volvocina: Goniidae

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

Tetrabaena 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).

Tetrabaena sociais, a disintegrated colony, cell body 18 μm long, 15 μm wide, L/W=1.2, an elliptical stigma at equator of the cell body, a pyrenoid at posterior half of the cell body, x 640, Kenmin-kenko-fukushi-mura Park, Koshigaya city, Saitama Pref., Japan, February 5, 2006 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Tetrabaena Tetrabaena Tetrabaena Tetrabaena
Cell body 13 μm long, 10 μm wide, L/W=1.3, x 640
Tetrabaena Tetrabaena Tetrabaena Tetrabaena

Images of collecting locality: Kenmin-kenko-fukushi-mura Park, Koshigaya city, Saitama Pref., Japan, February 5, 2006 by Y. Tsukii

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