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:
Astasia,
cell body 48 μm long, 10 μm wide,
x 640, Ushidome-ike (pond), Norikura highland, Azumi village, Nagano Pref., Japan, May 28, 2005 by Y. Tsukii
31 μm
63 μm
94 μm; x 640