Genus: Body oval to round, rear rounded; 1 proboscis (Illustrated Guide, 1985).
Round cytostome at base of neck; contractile vacuoles many (Kudo, 1966).
Species:
Trachelius subtilis,
cell body 162 μm long, 72 μm wide,
x 100 , x 400, Shinrin-koen, Namegawa town, Saitama Pref., Japan, October 1998, by Y. Tsukii ovum small variety ?; but the shape of cytostome and the size of contractile vacuoles
are different from those of ovum
50 μm
100 μm
150 μm; x 400
Trachelius, x 200, x 400, December 1998 by Y. Tsukii