Abstract
An analysis of specificity of the genus Helicometra (Trematoda: Opecoelidae) for the five teleosts Zosterisessor ophiocephalus, Gobius niger (Gobiidae), Symphodus cinereus (Labridae), Anguilla anguilla (Anguillidae) and Blennius pavo (Blenniidae), which are sympatric in the Etang de Thau (Hérault, France), was carried out using biosystematic investigation (enzymatic polymorphism). The results of this genetic analysis show that the genus Helicometra consists neither of a complex of strictly specific species nor of a single very polymorphous species with broad specificity. Indeed, the existence of at least three species is shown with different degrees of specificity for their final hosts (teleosts).
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