比较吸虫和线虫.doc

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1、nematodetrematdaLifecyclesimilarities①Theirdefinitivehostsarebothhumansandvertebrates②theybothinfecthostsbyoralandskininfectiondiferences①needecdysisthroughitsgrowth,generally4times②donothavealternationofgenerations③lifecycleinclude：egg、larva、adult④havedivisions:soil-transmittednematode(n

2、oneedofintermediatehost)verctor-bornenematode(needoneintermidiatehostsuchasmosquito)⑤infectivestage：ovemorlarva①donotgothroughtheecdysis②havethealternationofgenerations(sexualgenerationandasexualgeneration)③lifecycleinclude:ovem,miracidiun,sporocyst,redia,cercaria,encystedmetacercaria,met

3、acercaria,adult④1.needintermediatehost,theasexualgenerationgenerallyhappensinimtermediatehostandsexualgenerationindefinitivehostssuchashumansandothervertebrates2.someneedreservoirhost(1th、2th...intermediatehost)toenterdefinitivehosts3.mostoftrematdasneed2intermediatehoststocompletetheirli

4、fecircles(1thisgastropodsuchasfreshwatersnail,2thisfish、arthropod、shellfish⑤infectivestage:encystedmetacercaria(most),cercaria