Genus: Only 1 flagellum emergent from canal, colourless; eyespot present; cell body semi-rigid, but can bend and loop; elongated, tapering; paramylon grains needle-like; several species, freshwater (Illustrated Guide, 1985).

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C. acus 180 x 6 μm Ohyachi 1 Hachimantai Akita, 2007	C. acus 124 x 6.5 μm Ohyachi 3 Hachimantai Akita, 2007	C. acus μm Iroha-numa 6 Zao mountain Yamagata, 2008
C. acus 280? x 8.5 μm Kannon-numa Shimogo Fukushima, 2005	C. acus μm Kannon-numa Shimogo Fukushima, 2008	C. acus 150-165 x 8-14 μm Akebono marsh Tsuchiyu-onsen Fukushima, 2005	C. acus anterior truncated 170 μm Hazama marsh Ashikaga Tochigi, 2006
C. acus anterior truncated μm Doman-green Park Nishi-Urawa Saitama, 2003	C. acus anterior truncated 170 x 8 μm Kitamoto nature o.p. Kitamoto Saitama, 2005	C. acus anterior truncated 162 x 7 μm Riverside green l. Sawara Chiba, 2004	C. acus Lepocinclis acus ? anterior rounded 156 μm Ichikawa Chiba, 2001
C. acus 185 x 6-7 μm Lake Nojiri Shinano Nagano, 2004	C. acus anterior truncated 157 x 7 μm Tanohara marsh Shiga highland Nagano, 2004	C. acus anterior truncated 152 x 9 μm Kami-no-koike Shiga highland Nagano, 2004
C. acus μm Kashibaru m.2 Karatsu Saga, 2008	C. acus anterior truncated 165 μm Uruguay, 1999

Similar species -->> Euglena acus

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