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).

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Posteriorly pointed		Posteriorly rounded
A. longa = E. longa 16 samples 38-54 μm 1999-2005	A. longa = E. longa 16 samples 38-54 μm 1999-2005	A. lagenula 7 samples 20-65 μm 199?-2002	A. lagenula 7 samples 20-65 μm 199?-2002
Posterior end tapered
A. klebsi 43 x 13 μm Yagiri Chiba, 2001	A. klebsi ? μm Iruma Saitama, 2003	A kathemerios ? 6 samples cell 21-48 x μm 199?-2005	A kathemerios ? 6 samples cell 21-48 x μm 199?-2005
Others
Astasia sp. ? flg. straight at rest μm Chichibu Muse Park Saitama, 2003	Astasia sp. ? phagocytotic ? μm Iruma Saitama, 2003	Astasia sp. ? stigma present 33-41 x 15-20 μm Ogose town Saitama, 2003	Astasia sp. ? 23 x 5 μm Uruido Hasuda Saitama, 2005
Astasia sp. ? 46 x 7 μm Hazama marsh Ashikaga Tochigi, 2006

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