| cestodes of cestodes of peruvian freshwater stingrays. | adult tetraphyllidean tapeworms (platyhelminthes: eucestoda) from the spiral intestines of 3 species of potamotrygonid stingrays (paratrygon aiereba, potamotrygon castexi, and portamotrygon motoro) in the madre de dios river in peru were found to host numerous cysts embedded in their parenchymal tissues. histological sections of the cysts revealed the presence of a scolex bearing 4 suckers and an unarmed apical organ consistent with larval stages of both cyclophyllidea and proteocephalidea. to f ... | 2003 | 14627150 |