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: 30-60 μm long, Spines around rim of collar, also on rear 1/4 of lorica, fresh water (How to know the protozoa, 1979).

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Short collar present; spines absent at anterior end
var. armata 36 x 28 μm near Town Hall Shobu Saitama, 2004	var. armata 38 x 29 μm Sano Hakuba Nagano, 2004	var. armata 35 x 27 μm Junichogata Himi Toyama, 2006	var. armata 32 x 25 μm Izumi 741 Namegawa Saitama, 2004
var. armata ? 42 x 33 μm Uruguay, 1999	var. armata 30,38 x μm Junichogata s.k. Himi Toyama, 2006	var. armata ? spines thin & short 32 x 24 μm Mihashi Park Saitama, 2002	var. armata ? spines thin & short 32 x 26 μm Kumano park Higashi-Murayama Tokyo, 2004
Collar present; spines present at both ends (anterior short, posterior long)
var. ovata 40 x 34 μm Kejo-numa Osaki Miyagi, 2006
Collar absent; spines present at both ends (anterior short, posterior long)
var. steinii 44 x 35 μm water reservoir near Yamaguchi Univ. Yamaguchi, 2004	var. steinii 40 μm Hiroshima, 1998 Movies	var. steinii 40 x 31 μm Higashi-sano Hakuba Nagano, 2004	var. steinii or var. armata ? 36 x 30 μm 38 x 29 μm Furuyakami Kawagoe Saitama, 2004
var. steinii 42 x 34 μm Izumo Shrine Izumo Shimane, 2006
Collar absent; long spines at posterior end; lorica covered with dented projections
var. longispina or var. ovata ? 43 x 33 μm Uruguay, 1999	var. longispina or T. superba ? 41 x 31 μm USA, 1999

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