InvertebratesPhylogenyVertebratesMolecular Sequence DataAnnelidaCnidariaEchinodermataRNA, Ribosomal, 16SPoriferaBacteroidetesBacteriaMolluscaChordata, NonvertebrateEvolution, MolecularArthropodsDNA, RibosomalSequence Analysis, DNAUrochordataAquatic OrganismsPlatyhelminthsBiodiversityCrustaceaAmino Acid SequenceBiological EvolutionHydrozoaPolychaetaSpecies SpecificityBivalviaGastropodaCiona intestinalisEcosystemMarine BiologyChordataSequence AlignmentBryozoaMetagenomeChloroflexiDNA, BacterialSeawaterSequence Homology, Amino AcidBase SequenceGenes, rRNAInsectsOligochaetaAmphipodaSea CucumbersApicomplexaLarvaPhotoreceptor Cells, InvertebrateProteobacteriaGeologic SedimentsGanglia, InvertebrateRotiferaEukaryotaBase CompositionDrosophila melanogasterSea AnemonesCtenophoraNematodaBiotaOceans and SeasConserved SequenceLymnaeaDrosophilaCytophagaDrosophila ProteinsHemocytesFood ChainInvertebrate HormonesSoil MicrobiologySymbiosisCaenorhabditis elegansAnthozoaAcidobacteriaActinobacteriaSnailsFishesIsopteraRNA, Ribosomal, 18SPlacozoaCephalopodaBrachyuraLeechesMultigene FamilyFungiCloning, MolecularFresh WaterMetagenomicsGenomeEmbryo, NonmammalianMytilusLife Cycle StagesGene Expression Regulation, DevelopmentalDaphniaArchaeaGenome, BacterialBacterial Physiological PhenomenaGastrointestinal TractSequence Homology, Nucleic AcidCluster Analysis