Aroapyrgus alleei Morrison, 1946 (Gastropoda: Hydrobiidae) first intermediate host of paragonimus mexicanus in Colima, Mexico

The lung fluke Paragonimus mexicanus infects opossums in the state of Colima, on the Pacific coast of Mexico. Some of the hydrobiid snails occurring in the same area, and identified as Aroapyrgus alleei Morrison, 1946, were found naturally infected with rediae and cercariae of P. mexicanus. The morphology of A. alleei is here described and compared to that of other species of Aroapyrgus, which are actual or potential hosts of lung flukes in other enzootic or endemic areas in Central and South America.