Abstract
The adult ofClinostomum tilapiaen.sp. obtained from the buccal cavity and oesophagus ofBubulcus ibis7½ days after experimental infection with metacercariae is described.The metacercaria ofC. tilapiaen.sp. fromTilapia zilli,T. heudelotiandT. galilaeais described.Anatomical differences between metacercariae and adults of the species are listed.