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 (Pleurochloridaceae, Mischococcales, Xanthophyceae),
cell body 55 μm wide between projections, chloroplasts small, parietal, disc-shaped, without pyrenoids,
x 640, Shikinawa-ike (pond, near Kayoicho Park), Kasuya town, Fukuoka Pref., Japan, October 2001 by Y. Tsukii
94 μm; x 640