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PhylumMolluscaBIO2215OklahomaCityCommunityCollegeDennisAnderson1PhylumMollusca2NumbersofspeciesEchinodermataCiliophoraChordataMolluscaPlatyhelminthesNematodaPoriferaAnnelidaOtherApicomplexSarcomastigophoraArthropoda3Molluscs50,000-100,000livingspecies35,000extinctspeciesLargest=1000pounds80%lessthan5cmSoftbodyMosthaveashellMostmarineSnailsterrestrialMosthabitat4PhylumMolluscaVentralFootLocomotionMantleEnclosesmantlecavityShellRadulaCoelom(eucoelomate)MetanephridiaOpencirculatorysystemClosedincephalopods5EconomicsPearlsBurrowingshipwormsSnails&slugsGardenpestsFoodIntermediatehostsforparasites6TrochophoreLarvaSametypeasPhylumAnnelida7MyxozoaArthropodaAnnelidaMolluscaLophophoresHemichordataVertebrataOtherpseudocoelomatesNematodaPoriferaCtenophoraCnidariaPlacozoaPlatyhelminthesNemerteaCiliophoraSarcomastigophoraMicrosporaApicomplexaMesozoaEchinodermataCrustaceaChelicerataUniramiaOtherChordata8GeneralizedMollusc9BodyPlanMantlecavityCtenidiumPericardialcavityMetanephridiumRadulaGonadStomachanddigestiveglandFoot10Dorsalmantlecoversthevisceralmass.11Secretestheshell12Ctenidium(Respiration)13Completedigestivesystem14Pairedventralnervecords15Radula16Copyright©TheMcGraw-HillCompanies,Inc.Permissionrequiredforreproductionordisplay.Source:FromALifeofInvertebrates,Copyright©1979W.D.Russell-Hunter.RadularStructure17Coelom-metanephridia18ClassPolyplacophora

Chitons19ClassPolyplacophoraEightdorsalplatesReducedheadRadulareinforcedwithironScrapealgaefromrocks20ClassPolyplacophoraMantlecavityMouthCtenidiumFootAnus21ClassPolyplacophoraMouthDigestiveglandStomachGonadPericardialcavityNephridiumAnus22ClassBivalvia

Clams,Oysters,Shipworms23ClassBivalviaTwoshellsMostarefilterfeedersNoheadorradulaBurrowSand,wood,rocks242526GiantClam&BurrowingClamSiphon27ZebraMusselEnvironmentalPestBallastwaterofshipsfromEuropein1986AttackbesecretingadhesivebyssalthreadsEachotherOthermusselsManmadeobjectsPipes,plumbing28ZebraMusselLiveinhighdensitiesFeedonphytoplanktonReproducerapidly29ZebraMusselAttachtonativemusselsKilledallnativemusselsinLakeErie30DistributionofZebraMussel31BivalvestructuresIncurrentsiphonCtenidiumExcurrentsiphonHingeFootLabialpalp32ClamanatomyPericardialcavityHeartGonadIntestineStomachIncurrentExcurrentIntestineMetanephridium33ClamanatomyGonadIntestineStomachIncurrentExcurrentDigestivegland34ClamanatomyPericardialcavityHeartIncurrentExcurrentIntestine35ClamanatomyPericardialcavityHeartGonadIncurrentExcurrentIntestineMetanephridium36Oysters37PearlformationDevelopingpearlEpitheliumShellIrritantlodgedbetweenshellandmantleLayersofnacresecretedaroundforeignmaterial38Scallops39Shipworms40ClassGastropoda

Snails,Slugs,Conchs,Limpets41ClassGastropodaOneshell(ifpresent)Torsionofbody4243SnailTerrestrailMantlecavityfunctionsaslung44SnailTentacle

(Eyestalks)TentaclePneumostomeAnusFootMouthGenitalporeShell45Copyright©TheMcGraw-HillCompanies,Inc.Permissionrequiredforreproductionordisplay.InternalStructureofaGeneralizedGastropod46NudibranchNoshellDorsalprojectionsGillsNematocystdischarge47AbaloneSeveralholesintopofshellExcretewasteFoodforman48SlugNoshellGardenpests49LimpetHerbivoresClingtorocksorothersurfaces50ConchLargeshellMarineManyarepredators51ClassCephalopoda

Squids,Octopuses,Nautiluses52ClassCephalopodaShellinsquidandoctopusabsentorvestigialJetpropulsionInksacFootmodifiedintoarmsandtentaclesMarineAllpredators53SquidDorsalVentralPosteriorsurfaceRightLeft54SquidFinArmFunnel(siphon)EyeTentacleCollar55SquidShell(Pen)CtenidiumFunnelSystemicheartBranchialheart56SquidMaleTestisHectocotylousarmPenis57SquidFemaleOvarywitheggsNidamentalglandsOviducalglandOviducalopening58Copyright©TheMcGraw-HillCompanies,Inc.Permissionrequiredforreproductionordisplay.CephalopodEye59OctopusEightarmswithsuckersCrawlorejectwaterfromsiphonChangeskincolorchromatophoresMostintelligentinvertebrate60NautilusUpto94tentaclesNosuckersShellwithmanychambersLivesinoutermostchamber61AmmonoidsEx

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