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).
Species:
Similar genus -->> Tetraplektron;
Tetraedron;
Tetraedriella spinigera Skuja (Xanthophyceae),
cell body 35 μm wide,
x 640, Higusa-numa (swamp), Miyakawa, Hikari town, Chiba Pref., Japan, September 2003 by Y. Tsukii
31 μm
63 μm
94 μm; x 640