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).
Species: Unicells, planktonic; cell body flat, triangular (or qadrangular) in shape; laterally concave, 20-30 μm long; corners tapered into straight or slightly curved spines, 4-6 μm long; cell wall smooth (Photomicrographs of the Freshwater Algae, vol. 1, 1984).

Google Image Search

T. trigonum var. trigonum 27 μm Vermont-Maine U.S.A., 1999	T. trigonum var. trigonum 24 μm water reservoir near Yamaguchi Univ. Yamaguchi, 2004	T. trigonum var. trigonum 23 μm Bessho-numa Saitama, 2001	T. trigonum var. trigonum 17 μm Nasu Tochigi, 2001
T. trigonum var. trigonum 18 μm Shirahata-Numa Urawa Saitama, 2005
T. trigonum var. trigonum or Tetraedriella ? 33 μm Bessho-numa Saitama, 2001	T. trigonum var. trigonum ? or T. regulare v. incus or Tetraedriella ? 31 μm Ukima Park Tokyo, 2001	T. trigonum var. trigonum or Tetraedriella ? 30 μm Koshigaya Saitama, 2001	T. trigonum var. trigonum or Tetraedriella ? μm O-ike park Yabuki Fukushima, 2003
T. trigonum var. trigonum or Tetraedriella ? μm Daidarabotchi-ike Iizuna-kogen Nagano, 2003

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

Please click on species name for more images.

Copyright Protist Information Server