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