MolluscaGastropodaBivalviaSnailsPolyplacophoraNautilusOctopodiformesBiomphalariaPernaAnnelidaInvertebratesPhylogenyAtlantic OceanEchinodermataMolluscacidesRNA, Ribosomal, 18SLymnaeaGenome, MitochondrialGene OrderDisease VectorsMolecular Sequence DataDNA, MitochondrialRiversSchistosoma mansoniEvolution, MolecularBrazilSequence Analysis, DNABiological EvolutionPopulation DensityRNA, TransferBase SequenceSpecies SpecificityNucleic Acid ConformationDNA, RibosomalElectrophoresis, Polyacrylamide GelInternet