Genus: Unicellular; planktonic; cell body tetrahedron 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).
Similar genus -->> Tetraplektron;
Tetraedriella spinigera Skuja,
cell body 34 μm wide,
x 640, a water reservoir (pond) near Yamaguchi university, Yamaguchi city, Yamaguchi Pref., November 21, 2004, by Y. Tsukii
94 μm; x 640