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 elongated cylindrical, covered with dots (var. lacustris dots present hole lorica, 25-30 x 12-15 μm, var. ovalis dots restricted at both ends, 22 x 12 μm) (An Illustrated Guide to Freshwater Zooplankton in Japan, 2000)

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T. lacustris lorica 28 x 15 μm L/W=1.9 Sakitama-kofun p. Gyoda Saitama, 2004	T. lacustris lorica 24 x 12 μm L/W=2.0 Sakitama-kofun p. Gyoda Saitama, 2004	T. lacustris lorica 27 x 17 μm L/W=1.6 Yanase river Fujimi Saitama, 2003	T. lacustris v. ovalis ? lorica 24 x 12.5 μm L/W=1.9 water reservoir near Yamaguchi Univ. Yamaguchi, 2004
T. lacustris lorica 23 x 11 μm L/W=2.1 Oura central p. Oura Gunma, 2006	T. lacustris lorica 28 x 17 μm L/W=1.6 Iyari marsh 1 Omachi Nagano, 2007	T. lacustris lorica 28 x 16 μm L/W=1.8 Azami-ike 1 Norikura highland Nagano, 2007	T. lacustris lorica μm L/W=1.8 drainage ditch Sakura Chiba, 2008

Similar species -->> T. abrupta (cylindrical/ellipsoidal, dotted); T. klebsii (cylindrical, spiny); T. cylindrica (elongated cylindrical, smooth); T. pulcherrima (elongated ellipsoidal, smooth);

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