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: (An Illustrated Guide to Freshwater Zooplankton in Japan, 2000).

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var. cylindrica 27 x 12 μm 17 x 9.5 μm Oze-ga-hara Katashina Gunma, 2006	var. cylindrica 24 x 10,12 μm Iroha-numa Zao mountain Yamagata, 2005	var. cylindrica 23 x 11 μm Japan, 199?	var. cylindrica 18 x 8 μm Sano Hakuba Nagano, 2004
var. cylindrica 18 x 9 μm Higashi-sano Hakuba Nagano, 2004	var. cylindrica 16 x 8 μm Demaru-nakago Kawajima Saitama, 2005	var. decollata or var. cylindrica ? 22 x 11 μm Imori pond Myoko highland Niigata, 2004	var. decollata 19 x 8.5 μm Uruguay, 1999
var. decollata 16.5 x 9 μm Hazama marsh Ashikaga Tochigi, 2003	var. decollata 21 x 10 μm Ushidome-ike Norikura highland Nagano, 2005

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

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