LeechesHirudo medicinalisOligochaetaLeechingSpores, ProtozoanProtozoan Infections, AnimalEukaryotaAnnelidaPlants, MedicinalAeromonasGanglia, InvertebrateGangliaRNA, Ribosomal, 18SSwimmingBlotting, SouthwesternOctopamineInvertebrate HormonesInterneuronsFMRFamideGeologic SedimentsGastrointestinal TractAquacultureFish DiseasesSporesMotor NeuronsVideotape RecordingSymbiosisEthnobotanyMedicine, TraditionalFresh WaterNervous SystemLocomotionPhylogenyMolecular Sequence DataSerotoninCentral Nervous SystemPhytotherapyPlant ExtractsAction PotentialsBehavior, AnimalMedicine, African TraditionalEthnopharmacologyNeuronsSequence Analysis, DNAPlant Preparations