光裸方格星虫消化道的形态和组织学观察

*570228Sipunculusnudus3MorphologicalandhistologicalobservationsondigestivetractofSipunculusnudusWUPeng-feiWANGYanGUZhi-FengSHIYao-HuaWANGAi-ming(KeyLaboratoryforTropicalBiologyResources,MinistryofEducation;HainanKeyLaboratoryofTropicalHydrobiologyTechnology,OceanCollege,HainanUniversity,Haikou570228)ABSTRACTMorphologicalandhistologicalobservationsonthedigestivetractofSipunculusnuduswereconductedwithlightmicroscopy.Thedigestivetractconsistsofmouth,pharynx,esophagus,intestine,rectumandanus.Themouthissurroundedbytentaclestoformamouthtray,andthepharynxisshortandhasnoclearborderlinewiththemouth.Theesophaguscandrawbackandforth.Theintestineisverylongandreversesthreetimestoformaspiral.Caecumisattachedtorectum.Thewallofdigestivetractiscomposedofmucosa,submucosaandadventitia,havingnocontinuousmusclelayer,onlywithnumbersofmusclefibersinthesubmucosa.Theepitheliumofthemucosamembraneindigestivetractismainlycomposedofcolumnarcellswithdevelopedmicrovilliexceptforintestine.Theformofplica,thesubmucosaandthequantityofmusclefibersarealsodifferentamongvariouspartsofthedigestivetract.KEYWORDSSipunculusnudusDigestivetractMorphologyHistology(Sipunculusnudus),,,1990199290Green,1975Towel,1967;Portner,1984Edward,1995Rice,1986*[e-mail][e-mail]199019921993199920022003200720042005(Phascolosomaesculent)2005(P.pacificum)200711.120089-12308-15g7-12cm1.23-5Bouin’s7µmHE.OlympusDP12A:B:PlateA:DorsaloutlookofS.nudusB:DissectionoutlookofS.nudusi.p.r.b.e.re.in.t.o.a.neph.r.d.n.1.2.3.Note:i:?;p:Pharynx;r:?;b:Brainganglion;e:Esophagus;re:Rectum;in:Intestine;t.o.:?;a:Anus;neph:Nephridium;r.d.:Rectalcaecum;n:Neurochord;1:Firstintestineturn;2:Secondintestineturn;3:Thirdintestineturn22.1mouth(pharynx)(esophagus)(intestine)(rectum)(anus)rectalcaecum1A-B2.1.11-A2.1.21/333201-B2.1.31/31/31-B2.22.2.1-1“U”50-70µm-22.2.2-370-80µm-42.2.3-5-7300-400µm-850-60µm20-30µm-62.2.4,-960-80µm-102.2.5-1120-30µm-123200520071992200720052007()()20051/332005Marphysasanguinea20200720073PlateHistologicalstructureoftransversesectionofthedigestivetract1.2.3.4.5.6.7.8.9.10.11.12.×400Ci:PC:EC:IC:RC:CCC:SCC:PCC:MF:Gc:GrC:Ad:LM:Note:1:Pharynx;2:Pharynx;3:Esophagus;4:Esophagus;5:Intestine;6:Intestine;7:;8:?;9:Rectum;10:Rectum;11:Rectalcaecum12:Rectalcaecum400Ci:Cilium;PC:Pharynxcavity;EC:Esophaguscavity;IC:Intestinecavity;RC:Rectumcavity;CCC:Ciliumcolumnarepitheliumcells;SCC:Singlecolumnarepitheliumcell;PCC:Pseudostratifiedcolumnarepitheliumcell;MF:Musclefiber;Gc:Gobelcell;GrC:Granularcell;Ad:Adventitia;LM:Laminamuscular,,,.2005.,25(1):59,,.2007..,37(6):961967,.2002..,26(6):503509,,.2003..,22(6):7075,,.2007..,31(5):633638,,,.2007..,28(1):6570,,.2005..,40(5):1420,,.1992..,22(2):7288,,,,,.1990.().,20(1):9399,,,.2004..,3(2):136139.1999..,6(3):222226,.1993..,12(2):6976Edward,E.R.,Mary,E.R.1995.FunctionalorganizationofdermalcoelomiccanalsinSipunculusnudus(Sipuncula)withadiscussionofrespiratorydesignsinSipunculus.InvertebrateBiology,114(1):5163Green,W.1975.TheannualreproductivecycleofPhascolosomalrc(Sipuncula).Belgrade:NaucnoDeloPress.161168Portner,H.O.,Kreutzer,U.1984.MetalicadaptationoftheintertidalwormSipunculusnudustofunctionalandenvironmentalhypoxia.MarineBiology,79:237247Rice,M.E.1986.FactorsinfluencinglarvalmetamorphosisinGolfingiamisakia(Sipuncula).BullentinofMarineScience,39(2):362375Towle,A.,Giese,A.C.1967.TheannualreproductivecycleofthesipunculidPhascolsomaagassizii.Phsiol.Zool.,40:229237