The nyctotherus is the intestinal,endo-commensal of amphibians and some invertebrates. The n.ovalis present in the intestine of cockroaches and N.cordiformis i the rectum of frogs. The outer surfaces are oval measuring about 60-120 mew in length. The outer surface bears longtitudinal and slightly spiral rows of cilia.The cytoplasm includes of a contractile vacuoles a macronucleus and food vacuoles.The cytopyge a permanent pore for the egestion of food is located at its hinder end. The nutrition is holozoic and reproduction takes place by binary fission and conjugation.
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