| diopatra neapolitana (polychaeta: onuphidae) as a second intermediate host of gymnophallus choledochus (digenea: gymnophallidae) in the aveiro estuary (portugal): distribution within the host and histopathology. | this is the first host record of gymnophallus choledochus metacercariae infecting the polychaete diopatra neapolitana in the aveiro estuary (portugal). the metacercariae were found unencysted, and their morphology is similar to that presented by metacercariae harbored by nereis diversicolor and cerastoderma edule, although they are larger in size. in d. neapolitana, the prevalence and mean intensity of the infection was very high, at 100% and 202 +/- 139 metacercariae per host, respectively, sug ... | 2009 | 19441876 |