(subphylum Ciliophora, class Ciliatea)
A subclass of Protozoa in which the system of cilia in the oral region is well developed and conspicuous. Rows of oral cilia are arranged spirally, winding down toward the cytostome. Body cilia usually are sparse. There are six orders, and many genera. They occupy a wide range of habitats.
Subjects: Zoology and Animal Sciences.