InvertebratesArthropodsChordata, NonvertebrateAnnelidaPlatyhelminthsPhylogenyPoriferaEvolution, MolecularMolecular Sequence DataBiological EvolutionSpecies SpecificitySequence Homology, Amino AcidAmino Acid SequenceBase SequenceVertebratesCnidariaEchinodermataRNA, Ribosomal, 16SBacteroidetesBacteriaMolluscaDNA, RibosomalSequence Analysis, DNAUrochordataAquatic OrganismsBiodiversityCrustaceaHydrozoaPolychaetaBivalviaGastropodaCiona intestinalisEcosystemMarine BiologyChordataSequence AlignmentBryozoaMetagenomeChloroflexiDNA, BacterialSeawaterGenes, 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