Species: 70-120 μm long, 12-16 μm wide; elongate; three-ridged, rounded anteriorly and drawn out posteriorly; pellicle longitudinally striated; discoid chloroplasts numerous; two rod-shaped paramylon (paramylum) bodies (Kudo, 1966). 90-100 μm long; body twisted, with three longitudinal ridges (How to know the protozoa, 1979). Anterior end conical compared to that of E. oxyuris.

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Anterior end rounded
E. tripteris or E. oxyuris ? 300 x μm Tsuchiura Ibaraki, 2003	E. tripteris or E. oxyuris ? 240 x 18 μm near water t. c. Himi Toyama, 2006	E. tripteris 80, 140 μm Japan, 199?
Anterior end conical
E. tripteris 235 x 20 μm Saitama, 1999	E. tripteris 225 x 20 μm stigma 4.5 μm Japan, 199?	E. tripteris 204 x 15 μm Saitama, 1999	E. tripteris 194 x 18 μm Akebono-yama p. Chiba, 2002
E. tripteris 188 x 21 μm Omiya Saitama, 2001	E. tripteris 180 x 20 μm Mihashi Park Saitama, 2002	E. tripteris 180 x 20 μm Tsuchiura Ibaraki, 2002	E. tripteris 181 x 15 μm 5 paramylons Tsukuba Ibaraki, 2000
E. tripteris 173 x 16 μm Ichikawa Chiba, 2001	E. tripteris 145 x 20 μm Kabutoyama / Tamatsukuri Osato Saitama, 2004	E. tripteris 145 x 18 μm Shimo-muneoka Shiki Saitama, 2004	E. tripteris 127 x μm 1/2 twist Iruma Saitama, 2003
E. tripteris 125 x 13 μm near Yamaguchi Univ. Yamaguchi, 2004	E. tripteris 118 x 13 μm 1/2 twist Shikinawa-ike Fukuoka, 2001	E. tripteris 112 x 18 μm Urugay, 1999	E. tripteris 112 x 17 μm Jizoh-bori Sannoh Park Saitama, 2005
E. tripteris ? 110 x 11 μm body twisted Aka-ike Madarao highland Niigata, 2006	E. tripteris ? 105 x 16 μm body twisted Hazama marsh Ashikaga Tochigi, 2003	E. tripteris ? 105 x 13 μm Naruto Chiba, 2003	E. tripteris ? 102 x 19 μm Izumi-ya park Chiba city Chiba, 2007
E. tripteris ? μm Okahotto-Yatsu Abiko Chiba, 2008	E. tripteris ? 89 x 14 μm chl. para. 18-19 μm Tsuchiura Ibaraki, 2002	E. tripteris ? 85 x 12,16 μm 88 x 15 μm Akigase park Saitama, 2005	E. tripteris ? 85 x 12 μm Hanyu-Suigo p. Hanyu Saitama, 2006
E. tripteris ? μm Tonbo-no-numa Isumi Chiba, 2007	E. tripteris ? 83 x 12 μm chl. para. 18-19 μm Kamishiro Hakuba Nagano, 2004	E. tripteris 80 x 13 μm chl. 3-4 μm para. 16 μm body twisted Saitama, 1999	E. tripteris only 1 paramylon 73 x 11 μm Japan, 199?
E. tripteris 75 x 9 μm Kijioka Castle R. Honjo Saitama, 2006	E. tripteris 67 x 15 μm Aquatic botanical g. Sawara Chiba, 2004	E. tripteris 66 x 10 μm Kabutoyama / Tamatsukuri Osato Saitama, 2004	E. tripteris 65 x 10 μm Tsuchiura Ibaraki, 2002
E. tripteris ? 64 x 10 μm body twisted Akigase park Saitama, 2002	E. tripteris ? 64 x 12 μm near Town Hall Shobu Saitama, 2004
Anterior end truncated or attenuated
E. tripteris 110 x μm near Town Hall Shobu Saitama, 2004	E. tripteris ? 110 x 12 μm 100 x 11 μm Mizuko-kaizuka p. Fujimi Saitama, 2004	E. tripteris ? 63 μm body twisted Ishikawa, 2000

Similar species --> > E. oxyuris; E. gigas

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