Family: Colonial; cell body spherical with 2 or more pseudo-flagella (immobile); chloroplasts one, 2 or 3 in number, with or without pyrenoids (Illustrations of The Japanese Fresh-water Algae, 1977).
Genus: Colony within a gelatinous bag; cells uniformly arranged at the peripheral matrix; cell body spherical or ellipsoidal with 2 pseudo-flagella; 2-4 cells form a small subset; a single chloroplast cup-shaped, with a pyrenoid (Guide book to the "Photomicrographs of the Freshwater Algae", 1998). Small colonies planktonic or large ones attached to other substrates (Illustrations of The Japanese Fresh-water Algae, 1977).

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T. lacustris cell 8 μm Kitamoto Saitama, 2001	T. lacustris cell 11 μm Natural obs.p. Kitamoto Saitama, 2006
Tetraspora sp. cell μm Koaze river Saitama, 2002	Tetraspora sp. cell μm Shimizu Park Chiba, 2002	Tetraspora sp. cell μm Miyadera Iruma Saitama, 2003	Tetraspora sp. cell μm Miyadera Iruma Saitama, 2006
Tetraspora sp. cell μm Name river Namegawa Saitama, 2004	Tetraspora sp. cell 9 μm near Takasaka bridge Sakado Saitama, 2004	Tetraspora sp. cell 9 x 7-8 μm Owada Park Saitama, 2005	Tetraspora sp. cell 8-10 μm near Akai wetland Aizuwakamatsu Fukushima, 2005
Tetraspora sp. cell 9 μm Kyu-Omoi river Oyama Tochigi, 2005	Tetraspora sp. cell 10 μm near Kodanuki m. Fujinomiya Shizuoka, 2005	Tetraspora sp. cell 7-9 μm near Kodanuki m. Fujinomiya Shizuoka, 2006
Tetraspora sp. cell 8 μm Ichinose-enchi Norikura highland Nagano, 2005	Tetraspora sp. cell 10-13 μm Onnenai Kushiro marsh Hokkaido, 2005
Tetraspora sp. cell 6-11 μm Chiko-zan Park Sayama Saitama, 2005	Tetraspora sp. cell 8-12 μm Kawaguchi N. P. Kawaguchi Saitama, 2006	Tetraspora sp. cell 8-10 μm Toyonodai park Otone Saitama, 2006	Tetraspora sp. cell 8-10 μm Iyari marsh Omachi Nagano, 2006
Tetraspora sp. cell 7-10 μm Oyomi marsh Hakuba Nagano, 2006	Tetraspora sp. cell 6-10 μm Karakemi marsh Omachi Nagano, 2006

Similar genus -->> Palmella;

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