The abundance of freshwater snails in two rural sites of Pinar del Río, Cuba, which harbor
Pseudosuccinea columella
susceptible and resistant to miracidia of
Fasciola hepatica
was followed for one year. Susceptible snails were found in the most anthropic site (IPA) whereas the resistant population inhabited the most preserved one (El Azufre). Only two snail species coexisted with
P. columella at IPA site (
Physa cubensis
and
Tarebia granifera
) while five species were found at El Azufre, including an endemic from that province (
Hemisinus cubanianus
). Populations of both resistant and susceptible snails showed stable densities throughout the year, although the susceptible strain attained higher abundance. The highest densities were observed in April-May 2004 for the susceptible population whereas the resistant strain attained its highest abundance in January 2004. No record of
Fossaria cubensis was made and the thiarid
T. granifera occurred only at low densities. One of the sampled sites (IPA) meets all the conditions for the first report of
P. columella naturally infected with larvae of
F. hepatica
