We report the first finding of
Lymnaea cousini
naturally infected with
Fasciola hepatica
in Ecuador. A sample of 70 snails was collected in April 2005 from a wetland located in a valley at approximately 3000 m a.s.l., near the locality of Machachi, Pichincha Province. The prevalence of natural infection in
L. cousini was 31.43%, which is the highest value ever recorded for naturally infected lymnaeid species.
