University:
Swansea University
Course:
PM-149 | Genetics, Genomics & Evolution
Academic year:

2023
Views:

116

Pages:

3
Author:

Amal J.

Mollosca198- snail, squid, mussels, calins- -Triploblastic- Coelomates (True)Mollosca5classes.GastropodaBivalviaCephalopodaPolyplocoptoonaclampadvancedebitonSpails - Terrestrialaswellaspearl oysteroctopesswgsequaticinternal materialsquidsedentary,spailCalcarious shell.of pearlshellcreeporal seaflook, flat ventralslogabsent(nodinrandous)mother of pealnacesefoot, non segmentedSeaslog. - Predateenidations, extractProducedbemalocyst andby structurebelowsbellTorsion - twift body tomantlefit inside shellsecreatemother ofpearl awordsome invadingirritant beformpearls.shell over dorsal region just below shell epidermal sheet likestructure called mantle, below the manthmantle covityVentral Hoof - -extended, well developedRasping structure for guidding food - Radula ( jacilitated with like structure teethabsent in bivalviaoxygenaletRespiratory structure - ClenidaeFaortabloodtosinuseOpen circulatory system- no blood vessels.Excreatory- Nephridia.Weindeoxygenated blood Reproductionunisexualhernaptiroditicsequential hermaphroditismCephalopoda- most advanced- Greater cephalizationheadwith large brainChigest among invetimale)verteirrate eyes, well developed salivaryglands to secreate toxinfootmodifiedlo aim.squid8almst 2tentaclesnotifies60-90 tentaclesspecial structure - Jok sace(eprédation)escapesome hawest bioluminescent bacteria andrelease it with ink.Phylom annelidaBilateraltriploblasticcoelonatessegmentation- each segment withoa ganglionsegment ganglion arecapair oflocomotarystructure-Parprodiumconnect hynerveapairRespiration-Through bodywall.structure-Nephridiaclosedcirculatory system.hernaphroditeconsentizationTrocophore larvae annelidaPsychaetaeOrigochaita HiridunceEarth worthaleach Hirudinal medicinalisNelissandwarmedicinalCommolyapplicationknow ClitellataClitellum- CopulatorystructureNemertea- - Eu coelomates- rhyncocoel -fliid filled coel- maine warmsBryoza & Bracopoda solitary in DaturecolonialLophopbare -feeding structureforms.EcdyzosoaEcdysisEcdy3osteroids -help in mooltingNematoda - blwmollusca platy&mollusca in terms of evolution(Aschelminthes)e.elegans - freelivingAdult maintain fixed no of cells (a59cells)Pseudocoelomates.stylets - Be Piercing structurebook worms, pin worms (inside rectors),Ascaiis, Phylacial worms - Phylauian Elephentiasiswocheraria handrightidog lymph nodes 4 swellingof body extrinities

Notes on Phylum Molusca

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