Genus: Only 1 flagellum emergent from canal, colourless; eyespot absent; cell body fusiform or elongated, plastic, with pronounced euglenoid movement; many species, mostly freshwater (Illustrated Guide, 1985).
Species: Cell body spindle in shape, posterior end slightly pointed, 55-60 μm long, 8 μm wide (fixed sample); a locomotive flagellum 1/3 0 1/2 of the cell body in length; paramylon bodies bar-shaped or ellipsoidal, small (An Illustrated Guide to Freshwater Zooplankton in Japan, 2000). Cell body 70-96 μm long, 10-14 μm wide, two large paramylon bodies ring-shaped (An Illustrated Guide to Freshwater Zooplankton in Japan, 2000).

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Posteriorly pointed
A. longa & stock 38A, axenic 39-54 μm Uruguay, 1999	A. longa & stock Giw-2, axenic 47-44 μm Iwajuku Gunma, 2001	A. longa & stock Stm-5, axenic μm Chichibu Muse Park Saitama, 2003	A. longa & stock Smm-1, axenic μm Misato town Saitama, 2003
A. longa & stock Sra-7, axenic μm Misato town Saitama, 2003	A. longa or A. dangeardi ? stock Ika-1a, axenic μm Kanazawa Ishikawa, 2002	A. longa ? small var. μm Chichibu Muse Park Saitama, 2003	A. longa ? small var. stock Stm-6, axenic μm Chichibu Muse Park Saitama, 2003
A. longa & s. Snai-1 49 x 8 μm Namegawa Saitama, 2004	A. longa μm Naruto Chiba, 2003	A. longa μm Miyazawa Furukawa Miyagi, 2003	A. longa stock Mfu-1 Maeda Furukawa Miyagi, 2003
A. longa stock Taw-1 & -2 Watarase river Ashikaga Tochigi, 2004	A. longa & stock Gmat-1 53 x 7 μm drainage ditch near Akagi mt. Gunma, 2005	A. longa 40 x 9 μm drainage ditch near Akagi mt. Gunma, 2005	A. longa 38 x 7.5 μm Ichino river Namegawa Saitama, 2004

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