Locations of the 17 municipalities in São Paulo (Brazil) where the snails were collected. 1 Aparecida 2 Ilhabela 3 Caraguatatuba 4 Biritiba Mirim 5 Mogi das Cruzes 6 Santa Isabel 7 Franco da Rocha 8 Embu das Artes 9 São Lourenço da Serra 10 Juquitiba 11 Itariri 12 Juquiá 13 Ipaussu 14 Ourinhos 15 Martinópolis 16 Novais 17 Araraquara (coordinates are detailed in Table 1).