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).