Species: 50-175 μm long, 8-18 μm wide; body long spindle or cylindre, with a sharply pointed posterior end; numerous discoid chloroplasts; several paramylon (paramylum) bodies; nucleus central; stigma distinct; flagellum short, about one-fourth the body length (Kudo, 1966).

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With slight anterior constriction
Cell body large μm in length
E. acus 291 x 10 μm chl. 4 x 2.5 μm para. 22-25 μm Shikinawa-ike Fukuoka, 2001	E. acus 270 μm chl. μm para. μm Takezono-higashi p. Tsukuba Ibaraki, 2003	E. acus 220 x 11 μm 227 x 11 μm chl. μm para. 22-24 μm Uruguay, 1999
Cell body medium μm in length
E. acus 157 x 11 μm chl. μm para. 8-13 μm Mihashi Park Saitama, 2002	E. acus 150 x 10 μm chl. 3-4 μm para. 9-11 μm Japan, 1998 Movies	E. acus 146 x 13 μm chl. μm para. 20-24 μm Uruguay, 1999	E. acus 144 x 10 μm chl. 2-3 μm para. 17 μm Nishi-Urawa Saitama, 2001
E. acus 141 x 12 μm 135 x 9.5 μm Mitsumata-numa Kawagoe etc. Saitama, 2005	E. acus 133 x 11 μm Higashi-sano Hakuba Nagano, 2004	E. acus 131 x 9 μm near Town Hall Shobu Saitama, 2004	E. acus μm Kaji-ike park Abiko Chiba, 2008
Cell body small μm in length
E. acus 125 x 10 μm 120 x 11 μm chl. 3-4 μm para. 13 μm Saitama, 1999	E. acus 123 x 6 μm chl. μm para. μm water reservoir near Yamaguchi Univ. Yamaguchi, 2004	E. acus 115 x 8 μm chl. μm para. μm Akigase Park Saitama, 2005	E. acus 114 x 12 μm chl. μm Watarase Wetland Fujioka Tochigi, 2005
E. acus 114 x 8 μm 107 x 6 μm chl. 2-3 μm para. 9-11 μm Akigase Park Saitama, 2002	E. acus 113 x 5.5 μm chl. 3 μm para. 8-14 μm Shikinawa-ike Fukuoka, 2001	E. acus 96 x 9.5 μm Kitamoto nature o.p. Kitamoto Saitama, 2005	E. acus 94 x 6.5 μm chl. μm para. 10 μm Uruguay, 1999
E. acus 100 x 8 μm para. μm Hanyu-Suigo p. Hanyu Saitama, 2006
Anterior constriction absent
E. acus 55 x 5-6 μm chl. μm para. μm Taiwan, 19??	E. acus 50 x 7 μm chl. 2.5-3 μm para. 10 μm Saitama, 1999

Similar species -->> Cyclidiopsis; E. limnophila;

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