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: (Illustrations of The Japanese Fresh-water Algae, 1977).

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T. torsum 39 μm Shikinawa-ike Fukuoka, 2001

T. torsum ? 30 μm Sayama park Higashi-Murayama Tokyo, 2006

T. torsum 46 μm Ukima Park Kita-ku Tokyo, 2006

Tetraplektron sp. μm Higusa-numa Hikari Chiba, 2003

Similar genus -->> Tetraedriella; Tetraedron;

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