Immature eggs are discharged from the proglottids (up to 1,000,000 eggs per day per worm) and are passed in the feces. The incubation period in humans, after ...DiphyllobothriumFromWikipedia,thefreeencyclopediaJumptonavigationJumptosearchGenusofflatwormsDiphyllobothriumProglottidsofD.latumScientificclassificationKingdom:AnimaliaPhylum:PlatyhelminthesClass:CestodaOrder:DiphyllobothriideaFamily:DiphyllobothriidaeGenus:DiphyllobothriumCobbold,1858SpeciesD.pacificumD.cordatumDiphyllobothriumelegansDiphyllobothriumlatumLinnaeus,1757D.ursiD.dendriticumD.lanceolatumD.dalliaeD.yonagoensisD.nihonkaiense=D.klebanovskiiSynonymsCordicephalusWardle,McLeod&Stewart,1947Diphyllobothriumisagenusoftapewormswhichcancausediphyllobothriasisinhumansthroughconsumptionofraworundercookedfish.TheprincipalspeciescausingdiphyllobothriasisisD.latum,knownasthebroadorfishtapeworm,orbroadfishtapeworm.D.latumisapseudophyllidcestodethatinfectsfishandmammals.D.latumisnativetoScandinavia,westernRussia,andtheBaltics,thoughitisnowalsopresentinNorthAmerica,especiallythePacificNorthwest.InFarEastRussia,D.klebanovskii,havingPacificsalmonasitssecondintermediatehost,wasidentified.[1]OthermembersofthegenusDiphyllobothriumincludeD.dendriticum(thesalmontapeworm),whichhasamuchlargerrange(thewholenorthernhemisphere),D.pacificum,D.cordatum,D.ursi,D.lanceolatum,D.dalliae,andD.yonagoensis,allofwhichinfecthumansonlyinfrequently.InJapan,themostcommonspeciesinhumaninfectionisD.nihonkaiense,whichwasonlyidentifiedasaseparatespeciesfromD.latumin1986.[2]Morerecently,amolecularstudyfoundD.nihonkaienseandD.klebanovskiitobeasinglespecies.[3]Contents1Morphology2Lifecycle3Disease4Seealso5References6Sources7ExternallinksMorphology[edit]DiphyllobothriumlatumscolexTheadultwormiscomposedofthreefairlydistinctmorphologicalsegments:thescolex(head),theneck,andthelowerbody.Eachsideofthescolexhasaslit-likegroove,whichisabothriumforattachmenttotheintestine.Thescolexattachestotheneck,orproliferativeregion.Fromtheneckgrowmanyproglottidsegme