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 cylindroid with posterior end rounded, 45 μm long, 10 μm wide; a flagellum more or less longer than the body length; ovoidal paramylum granules (WPRNO).

->> Description at WPRNO

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Posteriorly rounded
A. lagenula ? or A. parvula ? Large variety 65 x 12 μm Tagami Kanazawa Ishikawa, 2002	A. lagenula ? or A. parvula ? stock Giw-1, axenic 54 x 12 μm Iwajuku Gunma, 2001	A. lagenula ? or A. parvula ? Small variety 45 x 9 μm Kanazawa Ishikawa, 2002	A. lagenula ? or A. parvula ? Small variety stock Ika-5, axenic μm Kanazawa Ishikawa, 2002
A. lagenula ? or A. parvula ? & stock Kgy-2, axenic posterior rounded 43 x 9 μm axenic, EM Kagoshima, 2001	A. lagenula ? or A. parvula ? posterior rounded 31 x 6.5 μm Hasuda Saitama, 2002	Astasia sp. A. parvula ? posterior rounded cell 20 x 4 μm Japan, 199?	A. lagenula ? or A. parvula ? cell μm USA, 1999

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