 
 
|  Genus (Claparède and Lachmann, 1858):  
Ovoid or cylindrical; apical cytopharynx; posterior bald; caudal cilia present; 
contractile vacuole posterior (Carey, 1992). Species: | 
 50 μm
 50 μm
 100 μm
 100 μm
 150 μm; x 400 :
 150 μm; x 400 : 
 31 μm
 31 μm
 63 μm
 63 μm
 94 μm; x 640
 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).