Family: Filamentous algae without branching; cell body cylindrical or fusiform swelled at the center; a single or many chloroplasts plate-like or small disc-shaped (Illustrations of The Japanese Fresh-water Algae, 1977).
Genus: Cell body cylindrical; each cell wall consists of two parts with "H" structure overlapping at the midregion; chloroplasts many, disc-shaped, without pyrenoids (Guide book to the "Photomicrographs of the Freshwater Algae", 1998).

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Cell body 6-12 μm wide
T. viride 13 samples 8-14 μm φ many chl. 1999-2008	Tribonema sp. 11-12 μm φ 2-4 chl. Shimo-muneoka Shiki Saitama, 2004	T. regulare 28 samples 6-9 μm φ 2-4 chl. 1999-2008	T. vermichloris 5 samples 16-55 x 7-9 μm 2005-2008
Tribonema sp. ? 6 μm φ Kiyose Tokyo, 2001	Tribonema sp. ? 6-6.5 μm φ Motono Chiba, 2003
Cell body less than 6 μm in width
T. minus 27 samples 4-7 μm φ 2 chloroplasts 2001-2008	T. minus ? 5 μm φ chloroplasts Usui river Takasaki Gunma, 2004	T. affine 7 samples 4.5-6 μm φ 2 chloroplasts 2004-2006	T. elegans 7 samples x 3.5-5 μm φ 2003-2006
T. ambiguum ? 12-15 x 3.5 μm Saitama, 1999	T. monochloron ? x 2.5-3 μm Lake Biwa Maihara Shiga, 2003	Tribonema ? or Oscillatoria ? μm Shishizuka Tsuchiura Ibaraki, 2003
Tribonema sp. ? μm Kiyose Tokyo, 2001	Tribonema sp. ? μm Oura central p. Oura Gunma, 2006

Similar genera -->> Microspora;

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