The egg of Diphyllobothriumlatum resembles the egg of a digenetic trematode, that is, it is oval and possesses a distinct operculum at one pole of the shell.[email protected]DiphyllobothriumlatumPageDiscussionHistoryWikis>CESTODES(AlsowithnotesonthefewAcanthocephalareportedfromcats)>ThePseudophyllidea>DiphyllobothriumlatumDiphyllobothriumlatum(Linnaeus,1758)Cobbold,1858Figs3-1through3-3ETYMOLOGY:Di=two;phyllos=leaf,andbothrium=groove;alongwithlatumfromtheLatinLumbricilatiwhichwasthetermtheRomansusedtodescribealltapeworms(asopposedtoLumbriciteretesfortheearthworm).SYNONYMS:TaenialataLinnaeus,1758;TaeniavulgarisLinnaeus,1758;TaeniamembranaceaPallas,1781;TaeniatenellaPallas,1781;TaeniadentataBatsch,1786;TaeniagriseaPallas,1796;Bothriocephaluslatus(Linnaeus,1758)Bremser,1819;Dibothriumlatum(Linnaeus,1758)Diesing,1830;BothriocephalusbalticusKüchemnmeister,1855;BothriocephaluscristatusDavaine,1874;BothriocephalustaenioidesLéon,1916;DibothriocephalusminorCholodlowsky,1916;DiphyllobothriumamericanusHallandWigdor,1918;DibothriumserratumDiesing1850;Diphyllobothriumfuscum(Krabbe,1865),Diphyllobothriumluxi(Rutkevich,1937);DiphyllobothriumparvumStephens,1908;DiphyllobothriumstictusTalysin,1932;DiancyrobothriumtaenioidesBacigalupo,1945.HISTORY:In1592DunuswasthefirsttorecognizablydescribeDiphyllobothriumlatum;thisdescriptionwasconfirmedbyPlaterin1602,whodifferentiateditfromtheTaeniaspecies(beefandporktapeworms)ofhumans(CitedinGrove,1990).ThefishwasshowntocontainthestagethattransmitstheparasitetohumansbyBraun(1883)whofedplerocercoidsfromfishtocats,dogs,andmedicalstudents.TheroleofthecopepodasthefirstintermediatehostwaselucidatedbyJanicki(1917)andRosen(1917).GEOGRAPHICALDISTRIBUTION:Diphyllobothriumlatumhasbeenreportedtooccurinhumansthroughouttheworld,innortheasternEurope,especiallyinFinland,Scandinavia,,theBalticstates,theformerSovietUnion,France,andSwitzerland.ItisbelievedtohaveexpandeditsrangeatsomepointwithhumantravelstoIsrael,centralAfrica,andSiberia.ItwasbroughtbyEuropeanstoth