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).

Lorica smooth (or dotted)
Collar present
T. playfairi 9 samples collar slanted 22-41 μm 1998-2005	Trachelomonas sp. 35 x 20 μm collar present Naruto Chiba, 2003	Trachelomonas sp. 32 x 22 μm collar present Jionji-shinsui p. Iwatsuki-ku Saitama, 2006	T. dubia or T. volzii ? 23 x 11 μm Mashiko Tochigi, 1999
T. volzii v. cylindracea 11 samples 24-34 x μm 2003-2008	T. hexangulata 3 samples 34-38 x μm Mizumoto Park 2006-2008
Collar absent or very short (less than 1/2 of hight): Lorica broad ellipsoidal, ellipsoidal, inverted ovoid or nearly spherical
Trachelomonas sp. 43 x 31 μm Uruguay, 1999	Trachelomonas sp. 34 x 25 μm Izumi 741 Namegawa Saitama, 2004	Trachelomonas sp. 35 x 25 μm near Town Hall Shobu Saitama, 2004	Trachelomonas sp. 39 x 30 μm Naruto Chiba, 2003
Trachelomonas sp. 30 x 19 μm Iroha-numa Zao mountain Yamagata, 2005	Trachelomonas sp. 32 x 23 μm Jionji-shinsui p. Iwatsuki-ku Saitama, 2006	T. dybowskii ? 33 x 23 μm Uruguay, 1999	T. dybowskii 13 samples broad ellipsoid 16-26 μm 2001-2006
T. oblonga ? 14 samples 14-30 x 11-23 μm 2000-2006	T. oblonga 14 samples 14-30 x 11-23 μm 2000-2006	T. ovoides 2 samples lorica 22-27 μm 2004-2005	T. volvocina 35 samples 10-27 μm 199?-2007
Collar absent or very short (less than 1/2 of hight): Lorica elongate cylindrical or ellipsoidal
T. pulcherrima 6 samples v. pulcherrima 17-27 μm 1998-2005	T. pulcherrima 6 samples v. latior ? 18-27 μm 1998-2005	T. pulcherrima 7 samples v. minor 18-27 μm 1998-2008	Trachelomonas sp. 24 x 10 μm Uruguay, 1999
T. cylindrica 10 samples 16.5-27 μm 1998-2006	T. cylindrica ? lorica dotted Kashibaru m. Karatsu Saga, 2008	T. pusilla μm drainage ditch Sakura Chiba, 2008	T. pusilla 3 samples 18- μm 2006-2008
Trachelomonas sp. very small 5.5 x 4 μm Okubo Ryoke Akigase park Saitama, 2005
Misc.
Trachelomonas ? μm Uruguay, 1999	Trachelomonas ? or tested amoeba? μm Japan, 1998

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