[Unusual xiphidiocercaria from Ampullaria canaliculata with reference to Travtrema stenocotyle].

In overflowed areas from the Lujan-River near Zelaya, province of Buenos Aires, Argentina, a xiphidiocercaria with stenostome excretory system and 2 [(4 + 4 + 4) + (4 + 4 + 4 +)] = 48 flame cells was found in Ampullaria canaliculata. The cercaria encyst experimentally in the skin and internal organs of tadpoles. Natural infections were found in Hyla pulchella. The metacercaria, excepting the excretory system, is similar to Travtrema stenocotyle Cohn, 1902 from snakes.--In Leimadophis poecilogyrus 4 Trematode specimens were found and provisionally classified as Travtrema stenocotyle. A revision of the excretory system of Travtrema stenocotyle is suggested.