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).
Species: Filament 6-7 μm wide; cell body 2-3 times longer than its width; 2-4 parietal chloroplasts (Süßwasserflora von Mitteleuropa 3, Xanthophyceae 1, 1978).

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T. regulare 6-9 μm φ Matsubushi Saitama, 2003	T. regulare 9 μm φ Senganpi suigo p. Sakura-ku Saitama, 2005	T. regulare ? 8-9 μm φ Itakura Gunma, 2003	T. regulare 9-10 μm φ Kanayama c.p. Kiyose Tokyo, 2007
T. regulare ? 8-9 μm φ Saitama, 1999	T. regulare ? 7 μm φ Matsubushi Saitama, 2003	T. regulare 9 μm φ Futago-tamagawa Setagaya Tokyo, 2004	T. regulare 9 μm φ Yanome-dam park Nasu Tochigi, 2004
T. regulare 7.5-8 μm φ Nanbata castle park Fujimi Saitama, 2004	T. regulare 6-7 μm φ Kami-muneoka Shiki Saitama, 2004	T. regulare 9 μm φ Watarase river Ashikaga Tochigi, 2004	T. regulare 8 μm φ Tama-gawa g.p. Fuchu Tokyo, 2004
T. regulare ? 9-10 μm φ Kurome river Asaka Saitama, 2004	T. regulare 7-8 μm φ Kurome river Asaka Saitama, 2008	T. regulare 9 μm φ rice field Nagareyama Chiba, 2008
T. regulare 21-25 x 8-9 μm Shimo-muneoka Shiki Saitama, 2004	T. regulare 8-18 x 7 μm Nanbata-shinden Fujimi Saitama, 2004	T. regulare ? 23-27 x 8-9 μm Riverside green l. Sawara Chiba, 2004
T. regulare 10-20 x 8 μm near Akai wetland Aizuwakamatsu Fukushima, 2005	T. regulare 17-27 x 7.5 μm Furuike marsh Togakushi highland Nagano, 2005	T. regulare 17-27 x 7 μm Tane-ike Togakushi highland Nagano, 2006	T. regulare 17-27 x 7 μm Iyari marsh Omachi Nagano, 2006
T. regulare 20-32 x 7 μm near Lake Aoki Omachi Nagano, 2006	T. regulare 15-29 x 5.5 μm Banpaku memorial p. Tsukuba Ibaraki, 2006	T. regulare 19 x 6 μm Oura central p. Oura Gunma, 2006	T. regulare 8 μm φ Oyama general p. Oyama Tochigi, 2006
T. regulare 17-23 x 7 μm near Fuki Golf Club Yoshimi Saitama, 2006	T. regulare 17-23 x 7 μm Ikenokochi m. Tsuruga Fukui, 2006

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