Genus: Body oval to round, rear rounded; 1 proboscis (Illustrated Guide, 1985).
Round cytostome at base of neck; contractile vacuoles many (Kudo, 1966).
Species:
Cell body up to 280 μm long (Kahl, 1930).
Trachelius subtilis,
cell body 180 μm long, 85 μm wide,
two ? ovoidal macronuclei,
x 400, x 640, Near Yo-Ro bridge, Kami-Fukuoka city, Saitama Pref., Japan, June 1999 by Y. Tsukii
50 μm
100 μm
150 μm; x 400
31 μm
63 μm
94 μm; x 640