[The external and internal morphology of the intermediate hosts of Fasciola hepatica].

The main morphological traits of Fossaria cubensis and Pseudosuccinea columella, the two intermediate hosts of fascioliasis in Cuba, were studied. Differences may be seen regarding some aspects of the external morphology, as well as in the internal morphology, mainly in the reproductive system. The radular teeth have differences which are rather intangible, not allowing for their taxonomic isolation on the basis of this criterion alone. These studies suggest to take into account several criteria in order to determine the taxonomic position of each species.