Metacercárias de Clinostomum marginatum (Digenea: Clinostomidae) em acará-bandeira Pterophyllum scalare (Osteichthyes: Cichlidae) no estado do Rio de Janeiro, Brasil

the present study recorded by the first time metacercariae of the digenetic clinostomum marginatum (clinostomidae) infecting specimens of the ornamental fish pterophyllum scalare, from the state of rio de janeiro, brazil. parasites were found encysted on the fins of the fish, forming small, white-yellowish, nodules