Family: Paoral membrane prominent, may be large and may project stiffly (Carey, 1992). Genus: Ovoid to ellipsoid; peristome begins at anterior end and extends for 2/3 the body length; a conspicuous membrane at both edges; one to many posterior stiff sensory cilia (Kudo, 1966). Swimming as leaping movement. Species:

Similar Genus ->> Uronema; Cyclidium

31 μm 63 μm 94 μm; x 640

Pleuronema setigerum Calkins, 1902: 40-50 μm long; long peristome with large undulatory membrane; long cilia; several large caudal cilia (How to know the protozoa, 1979). Elongate, 50 μm long; rather pointed in the posterior; cytostome and undulating membrane (velum) lie in the posterior region; somatic ciliation uniform with very long caudal cilia; macronucelus ovoid, located centrally (Carey, 1992).