Genus (Claparède and Lachmann, 1858): Ovoid or cylindrical; apical cytopharynx; posterior bald; caudal cilia present; contractile vacuole posterior (Carey, 1992). Species:

31 μm 63 μm 94 μm; x 640

Urotricha globosa Schewiakoff, 1893: 18 μm long, spherical in shape; cell body ciliated except at rear where a single caudal cilium emerges; macronucleus large and spherical; contractile vacuole posterior (Carey, 1992).