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 cylindrical (var. abrupta 22-30 x 15-19 μm and var. minor 16-20 x 10-12 μm) with semispherical ends, or elongated ellipsoidal (var. arcuata 20-30 x 14-18 μm); collar absent; surface granulated or dotted (many small and short spines) (An Illustrated Guide to Freshwater Zooplankton in Japan, 2000)

T. abrupta ? collar 1 μm 32 x 23 μm L/W=1.4 Mizuko-kaizuka p. Fujimi Saitama, 2004	T. abrupta ? short collar ? 30 x 21.5 μm L/W=1.4 Mihashi Park Saitama, 2002	var. abrupta 29 x 21 μm L/W=1.4 Doman Green Park Toda Saitama, 2004	var. abrupta ? 30 x 24 μm L/W=1.3 near Town Hall Shobu Saitama, 2004
var. abrupta 28 x 21 μm L/W= Junichogata Himi Toyama, 2006	var. abrupta ? 34 x 22.5 μm L/W=1.5 Azami-ike 1 Norikura highland Matsumoto, 2007	var. abrupta ? 30 x 21 μm L/W=1.4 Kibagata Park Komatsu Ishikawa, 2007	var. abrupta ? μm L/W= Tango-seki p. Chiba city Chiba, 2008
var. abrupta 29 x 18 μm L/W=1.6 Hazama marsh Ashikaga Tochigi, 2006	var. abrupta 28 x 19 μm L/W=1.5 Dewa Park Saitama, 2001	var. abrupta 28 x 18 μm L/W=1.6 near Akai wetland Aizuwakamatsu Fukushima, 2005	var. abrupta 27 x 17 μm L/W=1.6 Onnenai Kushiro marsh Hokkaido, 2005
var. abrupta 26 x 17 μm L/W=1.5 Mihashi Park Saitama, 2002	var. abrupta 28 x 18 μm L/W=1.6 Uruguay, 1999	var. abrupta short collar ? 27 x 17 μm L/W=1.6 Mihashi Park Saitama, 2002	var. abrupta 27 x 17 μm L/W=1.6 Mitsumata-numa Kawagoe etc. Saitama, 2005
var. abrupta 26 x 16 μm L/W=1.6 Higashi-sano Hakuba Nagano, 2004	var. abrupta ? 25 x 18 μm L/W=1.4 near Yoshino park Mitsukaido Ibaraki, 2006	var. abrupta 26 x 17 μm L/W=1.5 Dewa Park Koshigaya Saitama, 2006	var. abrupta or T. lacustris ? 26 x 15 μm L/W= Shiba river near Owada Park Saitama, 2005
var. arcuata 23 x 13 μm L/W=1.8 Shimo-muneoka Shiki Saitama, 2004	var. arcuata ? 17 x 8.5 μm L/W=2.0 Uruguay, 1999
var. abrupta ? or T. lacustris ? 30 x 18 μm L/W=1.7 water reservoir near Yamaguchi Univ. Yamaguchi, 2004	var. abrupta ? or T. lacustris ? 29 x 17 μm L/W=1.7 Iwajuku Gunma, 2001	var. abrupta ? or T. lacustris ? 27 x 15 μm L/W=1.8 Banpaku memorial p. Tsukuba Ibaraki, 2006	T. abrupta ? or T. lacustris ? 24 x 13 μm L/W=1.8 Uruguay, 1999

Similar species -->> T. lacustris (elongated cylindrical, dotted); T. hispida (ellipsoidal, spiny); T. allia (broad cylindrical, spiny); T. klebsii (cylindrical, spiny);

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