Fig. 1: trees resulting from phylogenetic analysis of ribosomal internal transcribed spacer 1 (ITS-1) sequences from individual snails belongs to Biomphalaria tenagophila complex (13 taxa). A: Neighbor-joining tree; B: Maximum parsimony tree (of 2277 most parsimonious trees). Sequences of two B. schrammi specimens and one B. kuhniana from Brazil (3 taxons) were considered as the outgroup. Bootstrap values lower than 60% are not shown. Species abbreviations are as defined in Table.