Gastrópodes dulciaquícolas e helmintos associados, em coleções hídricas de Santo André, São Paulo, Brasil

We registered the malacological and helminthological fauna in water collections in the county of Santo Andre, espe cially the Billings Reservoir, auxiliary in the identification of outbreaks of parasitic diseases in the county, special of schistosomiasis. The snails were collected in water collections like artificial pool, lake, stream and reservoir in the period from April to May 2009. The freshwater mollusks were identified and submitted to a parasitological exam to verify the presence of trematodes larvae. Eight species and one genus of mollusks were found: Biomphalaria tenagophila, Drepanotrema depressissimum, Lymnaea columella, Lymnaea viatrix, Melanoides tuberculatus, Omalonyx matheroni, Physa acuta, Physa marmorata e Pomacea sp. The geographic distribution of L. viatrix is expanded in the state of Sao Paulo, which until now was only known in the states of Minas Gerais, Rio de Janeiro and Rio Grande do Sul. Specimens of B. tenagophila were also found infected by larvae of trematodes, identified as Cercaria caratinguensis, Cercaria granulifera and echinocercaria I and of L. columella infected by Ornatae cercaria. The presence of B. tenagophila, L. columella, L. viatrix and M. tuberculatus in water collections in the county of Santo Andre should be viewed with some caution, because they are intermediate hosts of trematode that affect animal.and human population. Santo Andre is considered a potential risk for parasitic diseases for presenting records of intermediate helminthes host mollusks.