A major subclass of the class Ciliatea. These protozoa have a fairly uniform body ciliation, as the name implies. Separate articles appear on the groups listed in the following classification:

• Subclass Holotrichia
•  Order: Gymnostomatida
•      Trichostomatida
•      Chonotrichida
•      Apostomatida
•      Astomatida
•      Hymenostomatida
•      Thigmotrichida