Clinostomum marginatum (Braun, 1899) and Diplostomum (Austrodiplostomum) compactum (Lutz, 1928) metacercariae with zoonotic potencial on Pygocentrus nattereri (Kner, 1858) (Characiformes: Serrasalmidae) from Central Amazon, Brazil. - Morais, Aprigio Mota (2011)