Balantidium is a trichostomatid ciliated parasite,inhabiting the intestine of man,pigs,sheep etc. They are present in large numbers in the rectal contents of frog.The organism is large and ovoid and measures about 60-70mew. The entire outer surface is covered by longitudinal,slightly spiral rows of cilia. At the anterior end is a vestibule leading to the cell mouth or cytostome. it is lined by longer cilia. The cytoplasm includes two contractile vacuoles a macronucleus and food vacuoles. Nutrition is holozoic and the undigested residue is left by cytopyge.Reproduction takes place by asexual binary fission .Infection takes place through cysts in contaminated food and water
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