Genus (Nitzsch): Body short, cylindrical; body cilia as two distinct girdles, and a distinct tuft at rear (Illustrated Guide, 1985). Short cocoon-shaped, constricted in the middle; ventral surface flat; two broad girdles of cilia; fused cilia at posterior end (Kudo, 1966). Species: 50-80 μm long; unique movement (Kudo, 1966).

50 μm 100 μm 150 μm; x 400