Mendoza province lies to the west of Argentina, its backbone being the Andes Mountains. In its valleys can be found very high endemicities of fascioliasis in cattle , sheep, goats , horses, mules, donkeys and even introduced llamas. Up to the present, such high prevalences were always linked to the presence of only one lymnaeid vector species described in the region, Lymnaea viatrix , similarly as for most of Argentina. However, traditional malacologicalmethods have proven to be insufficient to reach species level classification in the Galba-Fossaria group4 .