MolluscaInvertebratesBivalviaGastropodaSnailsPolyplacophoraNautilusOctopodiformesBiomphalariaAnnelidaPernaPhylogenyEchinodermataAtlantic OceanLymnaeaRNA, Ribosomal, 18SMolluscacidesMolecular Sequence DataEvolution, MolecularVertebratesBiological EvolutionGenome, MitochondrialGene OrderRiversSpecies SpecificitySchistosoma mansoniDNA, MitochondrialDisease VectorsSequence Analysis, DNABase SequencePopulation DensityBrazilCrustaceaUrochordataChordata, NonvertebrateAquatic OrganismsPolychaetaArthropodsCnidariaAmino Acid SequenceRNA, TransferCiona intestinalisPhotoreceptor Cells, InvertebrateGanglia, InvertebrateDNA, RibosomalInsectsMarine BiologySea CucumbersDrosophila melanogasterAmphipodaOligochaetaHemocytesEcosystemLarvaNucleic Acid ConformationFood ChainInvertebrate HormonesCaenorhabditis elegansChordataSequence Homology, Amino AcidPoriferaCephalopodaDrosophila ProteinsBrachyuraDrosophilaBryozoaSequence AlignmentMytilusDaphniaFishesAstacoideaHorseshoe CrabsThoracicaLeechesOceans and SeasBiodiversityRotiferaOctopamineNephropidaePlatyhelminths