KHAWIA-BALTICA (CESTOIDEA, CARYOPHYLLIDEA) FROM BARBUS-BARBUS-BOCAGEIFROM SOME RIVERS IN NORTHERN PORTUGAL

Eight species of fishes from rivers of Northern Portugal were examined for cestodes but only one, Barbus barbus bocagei (Steindachner), was infected: river Este (4 of 12 infected, 1,1,4 adult and 37 juvenile ce stodes found respectively), Lima (1 of 8 infected, 1 juvenile cestode) , Paiva (1 of 5 infected, 57 juvenile cestodes) and Sousa (1 of 13 inf ected, 1 adult cestode). The cestodes were Caryophyllidea. The fan-sha ped scolex had very shallow incisions, with the scolex separated from the hindbody by a neck. The first vitelline follicles started a consid erable distance anterior to the testes, with some vitelline follicles along the lateral margins of the cirrus sac, uterine coils and H-shape d ovary. The uterine coils extended forward to the posterior half of t he cirrus sac. Transverse transmission electron microscope sections sh owed cortical vitelline follicles and medullary testes validating Lyto cestidae. These features identify Khawia baltica Szidat, 1941, describ ed from tench Tinca tinca (L.) in East Prussia and subsequently report ed from barbel B. barbus and T. tinca in Russia. This is a new host an d first record from Portugal and western Europe, thus extending the kn own range of distribution of K. baltica.