(subphylum Ciliophora, class Ciliatea)
An order of ciliate Protozoa that are characterized by the structure of the cytostome region, where there is a ciliated depression leading into a buccal cavity lacking cilia, at the base of which occurs the cytostome. Trichostomatida are found in freshwater habitats. Some are parasitic in the intestines of animals.
Subjects: Zoology and Animal Sciences.