Redescription of the tail and fin folds of Echinostoma revolutum cercariae from its type locality (Trematoda : Echinostomatidae)

Abstract

From its type locality in Germany, Echinostoma revolutum (Froelich, 1802) Dietz, 1909 have cercariae with long cylindrical tails, and typical slender finger-like tips. The tail surface bears seven independent fin folds arranged in three pairs : proximal dorso-ventral, distal dorso-ventral and ventro-lateral pairs, plus a single small papilla-like fold. Previous descriptions are inadequate due to incorrect interpretations or incomlete descriptions of the nature of the cercarial fin folds.