Figure 26.5 Diversity among the Ciliates (A) A free-swimming organism, this Paramecium belongs to a ciliate group whose members have many cilia of uniform length. (B) The barrel-shaped Didinium nasutum feeds on other ciliates, including Paramecium. Its cilia occur in two separate bands. (C) The parasite Trichodina creates suction with its ring of cilia that help attach it to the surface of a fish host.