Species: Filaments with a slight constriction at cell-cell junction; cell body cylindrical, slightly swelled at the center, 10-13 μm long ,4-5 μm wide, L/W=1.5-2-(3); chloroplasts 2 or 3 in number, plate-like (Illustrations of the Japanese Freshwater Algae, 1977). Filaments 4-6 μm wide; cell body up to 2 times longer than its width (Süßwasserflora von Mitteleuropa 3, Xanthophyceae 1, 1978).

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T. minus ? 25-34 x 7 μm φ 2 chloroplasts Numa-no-hara m. Madarao highland Niigata, 2005	T. minus ? 16-18 x 6 μm φ 2 chloroplasts ? Onnenai Kushiro marsh Hokkaido, 2005	T. minus ? 25-38 x 6 μm chloroplasts Onnenai Kushiro marsh Hokkaido, 2005	T. minus ? 14-15 x 6 μm chloroplasts Oyachi marsh Iizuna Highland Nagano, 2006
T. minus ? 15-18 x 6.5 μm chloroplasts Komado m.6 Showa & Tajima Fukushima, 2007	T. minus ? 10-13.5 x 6.5 μm 2 chloroplasts Shimo-muneoka Shiki Saitama, 2004	T. minus ? 14-21 x 6 μm chloroplasts Daini-koen Tochigi city Tochigi, 2007	T. minus ? 5.5-7 μm φ 2 chloroplasts Soka Saitama, 2002
T. minus ? 5.5-7 μm φ 2 chloroplasts Usui river Takasaki Gunma, 2004
T. minus 6-11 x 5.5-6 μm φ 2-4 chloroplasts Oyoshi Park Koshigaya Saitama, 2006	T. minus 5.5-6 μm φ 2-4 chloroplasts Kiyose Tokyo, 2001	T. minus 5.5 μm φ 2 chloroplasts Mizumoto Park Tokyo, 2001	T. minus 5.5 μm φ 2 chloroplasts Mizutori-no-Sato Kawagoe Saitama, 2006
Tribonema sp. 5.5 μm φ 2 chloroplasts Sanda Hyogo, 2001	T. minus 5.5-6 μm φ 2 chloroplasts Kiyose Tokyo, 2001	T. minus 5.5 μm φ 2 chloroplasts Sanda Hyogo, 2001	T. minus 5-6 μm φ 2 chloroplasts Torinome Kasen p. Kuroiso Tochigi, 2004
T. minus 5-6 μm φ 2 chloroplasts Kinu-gawa g. p. Takanezawa Tochigi, 2004	T. minus 4-5 μm φ 2 chloroplasts Tama-gawa g.p. Fuchu Tokyo, 2004	T. minus 4-5 μm φ 2-4 chloroplasts Kakuman-buchi Akagi mountain Gunma, 2005	T. minus 4.5 μm φ 2 chloroplasts Okubo Ryoke Akigase park Saitama, 2006
T. minus 13-24 x 4.5 μm 2 chloroplasts Tane-ike Togakushi highland Nagano, 2006	T. minus 16-22 x 4.5 μm 2 chloroplasts Hazama marsh Ashikaga Tochigi, 2006	T. minus 11-17 x 4.5 μm 2 chloroplasts Oyomi marsh Hakuba Nagano, 2006	T. minus 25-27 x 4.5 μm 2 chloroplasts Kitamoto p. Kitamoto Saitama, 2007
T. minus 12-14 x 4.5-5 μm 2 chloroplasts Kannon-numa Shimogo Fukushima, 2008	T. minus 4 μm φ 2 chloroplasts Lake Kawaguchi Yamanashi, 2001	T. minus or T. elegans ? 4 μm φ 4 chloroplasts near Karakemi m. Omachi Nagano, 2005

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