A new echinostome cercaria has been collected from Biomphalaria alexan drina inhabiting the River Nile infront of the High Dam (Aswan, Upper Egypt). The morphological characters are basically that of the genus Echino stoma in general, but new additional structures were observed, described and illustrated. As a result, it was considered a hitherto unknown cercaria, to which the name Cercaria aswani sp. nov. is proposed. Moreover, Aswan is considered a new locality for this parasite. Experimental trials to infect rats, ducklings and chickens with encysted form was not successful. Further trials were recommended to obtain the adult worms and to study the compl ete life cycle.