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).

Posterior end pointed
A. longa posterior pointed 52 μm Uruguay, 1999	A. longa stock 38A, axenic posterior pointed 52-56 μm axenic culture Uruguay, 1999	A. longa stock 38A, axenic posterior pointed 53 μm axenic culture Uruguay, 1999	A. longa stock 38A, axenic posterior pointed 39-54 μm axenic culture Uruguay, 1999
A. longa stock 38A, axenic posterior pointed 47 x 18 μm a cell flattened flag. 40 μm Uruguay, 1999	A. longa stock 38A, axenic posterior pointed 45 μm dividing cells Uruguay, 1999

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