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).
Astasia longa Pringsheim, 1936: 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). Outline shape similar to that of Euglena gracilis (How to know the protozoa, 1979).
Astasia lagenula Schewiakoff: 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).
Astasia klebsi :
Astasia dangeardi : Outline shape similar to that of Euglena rostrata (How to know the protozoa, 1979).
Astasia captiva :