Parasitological examination of Biomphalaria peregrina (D’Orbigny, 1835) (Mollusca, Planorbidae) from freshwater environments of the Buenos Aires province (Argentina), revealed the presence of three new larval stages of digeneans which were described and compared. One xiphidiocercaria, one cercaria belonging to the Echinostomatidae family and one metacercaria belonging to the Strigeidae family were recorded.