Order: Unicells or colonies of small number of cells; planktonic or attached to a substrate; cell body spherical, ellipsoidal, fusiform, polygonal or cylindrical in shape; a single or several chloroplasts plate-like or disc-shaped (Illustrations of The Japanese Fresh-water Algae, 1977).
Family: Unicells; planktonic; cell body spherical, ellipsoidal, ovoid, fusiform or polygonal in shape; cell wall smooth in most species; chloroplasts without pyrenoids; leucosin granules present (Illustrations of The Japanese Fresh-water Algae, 1977).
Genus: Unicells, planktonic; cell body tetrahedrial in shape; each corner drawn out to form a projection; many chloroplasts disc-shaped, without pyrenoids (Guide book to the "Photomicrographs of the Freshwater Algae", 1998).

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T. spinigera x 50 μm water reservoir near Yamaguchi Univ. Yamaguchi, 2004	T. spinigera 35 μm Higusa-numa Hikari Chiba, 2003	T. spinigera 34 μm water reservoir near Yamaguchi Univ. Yamaguchi, 2004	T. spinigera 40 x 40 μm Tane-ike Togakushi highland Nagano, 2005
T. spinigera 23 x 26 μm Sannoh park Nishi-ku Saitama, 2004	T. spinigera 24 x 24 μm Nanbata castle p. Fujimi Saitama, 2005	T. spinigera ? 55 μm Shikinawa-ike Fukuoka, 2001	Tetraedriella sp. 27 μm Noda Namegawa Saitama, 2004
Tetraedriella sp. 26 μm Kodama town Saitama, 2003	Tetraedriella sp. 25 μm Kodama town Saitama, 2003	Tetraedriella sp. 17 x 24 μm near Town Hall Shobu Saitama, 2004	T. jovetii 21 x μm Mizumoto Park Katsushika-ku Tokyo, 2006

Similar genus -->> Tetraplektron; Tetraedron (Chlorophyta);

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