Family: Unicells; cell body spherical or broad ellipsoidal; chloroplasts 1 to several in number, cup-shaped or plate-like, reticulated or star-shaped; with or without pyrenoids; reproduction by autospores and zoospores; many species found in soil (Illustrations of The Japanese Fresh-water Algae, 1977).
Genus: Cell body short, radiate in shape; apical view of the cell, triangular, polygonal, ellipsoidal or spindle-shaped; zygospores formed outside of mother cells (Illustrations of The Japanese Fresh-water Algae, 1977).

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T. trigonum 10 samples 17-33 μm 1999-2005	T. enorme 35 μm Sue-machi Fukuoka, 2001	T. enorme 32 μm Kawashima or Kawajima Saitama, 2002	T. enorme μm Kashiwa Village p. Kashiwa Chiba, 2008
T. limneticum ? μm O-ike park Yabuki Fukushima, 2003	T. limneticum ? μm near Hachimantai Mt. Senboku Akita, 2007	T. limneticum ? μm Kashibaru m.3 Karatsu Saga, 2008	T. limneticum ? 15 μm Dedono-yu Nishiwaga Iwate, 2007
T. limneticum ? μm Kareki-numa Nikko Tochigi, 2008	T. incus var. irregulare 6 samples 38-40 μm 2001-2006	Tetraedron sp. or Tetraedriella ? 32 μm Ukima Park Tokyo, 2001
T. caudatum var. incisum μm Akigase Park Saitama, 2002	T. caudatum ? μm Chiba-Minato Park Chiba, 2003	T. caudatum ? 10-13 x 7 μm Shiba river near Owada Park Saitama, 2005	T. caudatum ? μm near Dedono-yu Nishiwaga Iwate, 2007
T. caudatum ? μm Kashiwa Village p. Kashiwa Chiba, 2008	T. regulare 12 x 14 μm USA, 1999	T. regulare μm Kodama Saitama, 2003	T. regulare μm O-ike park Yabuki Fukushima, 2003
T. triangulare var. triangulare 30 μm Sue-machi Fukuoka, 2001	T. triangulare 14 μm Tsukuba Ibaraki, 2002	T. triangulare 13 μm Musashi-Urawa Saitama, 2002	T. triangulare 12 μm Tsukuba Ibaraki, 2002
T. tumidulum or Tetraedriella ? 25 x 24 μm Hasu-ike Shiga highland Nagano, 2005	T. tumidulum or Goniochloris ? 11 μm Tokyo, 2001	T. minimum 7 samples 5-12 μm 1999-2003

Similar genus -->> Tetraedriella (Xanthophyceae); Goniochloris (Xanthophyceae);

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