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 broad ellipsoidal, 16-22 μm long, 12-18 μm wide, surface smooth, no collar (An Illustrated Guide to Freshwater Zooplankton in Japan, 2000). Lorica 16-32 μm long, 10-18 μm wide, (Illustrations of The Japanese Fresh-water Algae, 1977).

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T. dybowskii ? 25 x 23 μm Hakkoda Gourd line Hakkoda mountain Aomori, 2005	T. dybowskii ? 25 x 23 μm Suiren-numa Hakkoda mountain Aomori, 2005	T. dybowskii μm Mizuko-kaizuka p. Fujimi Saitama, 2003	T. dybowskii 24 x 20 μm O-ike park Yabuki Fukushima, 2003
T. dybowskii 22 x 19.5 μm Nishi-Urawa Saitama, 2001	T. dybowskii 16 x 13 μm Nishi-Urawa Saitama, 2001	T. dybowskii 15 x 13 μm Mizuko-kaizuka p. Fujimi Saitama, 2004	T. dybowskii 18 x 15 μm near Town Hall Shobu Saitama, 2004
T. dybowskii or T. intermedia ? 26 x 24 μm Sannoh park Nishi-ku Saitama, 2004	T. dybowskii or T. intermedia ? 21 x 18 μm Sannoh park Nishi-ku Saitama, 2004	T. dybowskii or T. intermedia ? 27 x 21.5 μm Shirahata-Numa Urawa Saitama, 2005	T. dybowskii or T. cervicula ? 23 x 21 μm Tanohara marsh Shiga highland Nagano, 2004
T. dybowskii 31 x 25 μm Hasu-ike Mizumoto Park Tokyo, 2006

Simlar species -->> T. intermedia; T. granulosa;

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