SUMMARYThe currently known distribution range of Achatina fulica Bowdich, 1822, in the state of São Paulo, Brazil, is presented. The record of A. fulica naturally infested with Aelurostrongylus abstrusus larvae (Railliet, 1898) (Nematoda: Metastrongylidae) can be found in the city of Guaratinguetá. It was found A. fulica with Metastrongylidae larvae without known medical and veterinary importance in the cities of Carapicuíba, Embu-Guaçu, Itapevi, São Caetano do Sul, São Paulo and Taboão da Serra.

O trabalho identifica larvas de trematódeos encontradas parasitando moluscos dulciaquícolas em municípios da Região Metropolitana de São Paulo, Estado de São Paulo, Brasil. A pesquisa malacológica foi realizada no período de novembro de 2008 a outubro de 2011. Os moluscos foram identificados e submetidos a exame parasitológico. Foram identificados moluscos das famílias Ampullariidae, Ancylidae, Lymnaeidae, Physidae, Planorbidae e Thiaridae. Observaram-se 21 formas larvais de trematódeos parasitando os moluscos. Dessas, sete não foram encontradas na literatura consultada: cercária I, echinocercária I, echinocercária IV, strigeocercária I, strigeocercária II, strigeocercária III e strigeocercária IV. A presença de moluscos dulciaquícolas, hospedeiros intermediários de trematódeos, pode representar risco para a transmissão de agentes infectantes causadores de doenças de interesse médico e veterinário em municípios da Região Metropolitana de São Paulo, sendo o monitoramento dessas áreas extremamente importante.

SUMMARYTo observe the effects of the parasitic infection on the biology of B. tenagophila, field and laboratory populations of this mollusk from Itariri, in Vale do Ribeira, Brazil, were experimentally infected. Each mollusk received 10 miracidia of Schistosoma mansoni (SJ lineage) and was observed throughout the parasite's development. The biological variables were compared according to the criteria "group" and "infectious phase". The main damage caused by the parasitic infection manifested itself in reproduction, longevity and lesions on the shell of the mollusks in the patent phase. An infection rate of 58.8% was observed. Microanatomical study of the mollusk's digestive gland and ovotestis revealed the presence of evolving larval forms and cercariae. It was concluded that the effects of the parasitic infection on both populations were moderate, despite the low survival rate of the infected mollusks, the damage did not prevent either reproduction or the elimination of cercariae, which continued for a long time.