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Current distribution of the exotic freshwater snail Helisoma duryi (Gastropoda: Planorbidae) in Brazil

2010; Bailey-Matthews Shell Museum; Volume: 124; Linguagem: Inglês

0028-1344

Mônica Ammon Fernandez, Silvana Carvalho Thiengo, Fernando Schemelzer de Moraes Bezerra, Lúcia Maria Alencar, Ce Secretaria de Saúde do Estado do Ceará. Fortaleza,

Environmental Toxicology and Ecotoxicology

This article describes the current distribution of the introduced gastropod Helisoma duryi in Brazil. The species was recorded for the first time in Brazil in 1972, in Formosa, state of Goia´ s, and since then it has been reported to occur in the states of Ceara´ , Minas Gerais, Parai´ba, Rio de Janeiro, and Sa˜o Paulo. Recently, this species was found in the state of Ceara´ , where it was introduced through ornamental fish and aquatic plant trade. The expansion of the species range in Brazil demonstrates the need for increased efforts to monitor and control the introduction of exotic species. Up to now, H. duryi had been found in 14 municipalities together with specimens of Ampullariidae, Ancylidae, Corbiculidae, Lymnaeidae, Planorbidae, Physidae, and Thiaridae. We believe that the current absence of H. duryi in the localities where it had been previously collected (1972 and 1998) could be associated with environmental changes in those regions and also because selfing in H. duryi is not as efficient as it is for other Planorbidae species. A map with the distribution of H. duryi is also provided.