Genus: Euglenas in a close fitting lorica; a single long flagellum extends through small opening; lorica with or without short collar; yellow to brown (How to know the protozoa, 1979). Lorica often possesses numerous spines, composed of ferric hydroxide impregnated with brown manganic compound (Kudo, 1966).
Species: Lorica ellipsoidal, 10-16 μm long, 8-12 μm wide, surface smooth, collar present or periphery of the opening thickened, 2-3 chloroplasts saucer-shaped (An Illustrated Guide to Freshwater Zooplankton in Japan, 2000).

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Collar present, but very short (less than at least 1/2 of its height)
T. oblonga ? 35 x 24 μm near Town Hall Shobu Saitama, 2004	T. oblonga ? 30 x 23 μm Naruto Chiba, 2003	T. oblonga ? 30 x 19 μm Mizuko Fujimi Saitama, 2003	T. oblonga ? 28 x 20 μm Mizuko Fujimi Saitama, 2003
Collar absent
T. oblonga ? 36 x 24 μm near Town Hall Shobu Saitama, 2004	T. oblonga ? 30 x 23 μm Mizuko Fujimi Saitama, 2003	T. oblonga ? 27 x 21 μm Shiro-numa Tatebayashi Gunma, 2001	T. oblonga ? 19 x 15 μm Japan, 2000
T. oblonga 16 x 14 μm Ushidome-ike Norikura highland Nagano, 2005	T. oblonga 16 x 13 μm Sendabori Chiba, 2002	T. oblonga 15 x 11 μm Yoshimi-machi Saitama, 2001	T. oblonga 14 x 12 μm Watarase Wetland Fujioka Tochigi, 2005
T. oblonga ? 18 x 15 μm Hanasaki water p. Kazo Saitama, 2005	T. oblonga ? 12.5 x 11 μm Madarao highland Myoko Niigata, 2006

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