Unit - 02: Cnidaria and Ctenophora

(unit-o) (cniccria nd cengphova) 1. Gene nas charact( a. clasiiçation Ut ob cindaria Ioo up to clasresoibed 3-polymorphism in cidonia 4. (ortal 4cormalnges 5. enertal char(a cter ot ctenophora 6-Evolutionany siqniticante of ctenophona 7-Metagenesis in belia 9. Cnenenal characteresgt oidoria qrade ot 7 Tissue ‘ The word otqanisation o CCurtS Colentehata has been dertive brtom Coelon-Gastro vastulaf cavity 7maimum ertqanicm aneeavity marineonaydci marine rhey may be colonial on trieeliving 7Sody is rodiafy symmetrica, Body is diploblastic No dictinct headaei Segmentationif abient.Tentacles are pnesenit 7 Body is acoelOmate ? Respirtatorty erenetory ard cincul atorysq tem stt absent. 7 SKeleton may be preert | obset 7Some unpol arised nere ce is prreseot 7Poy mortpnis j ts seen. 7Both Sequal and aseyual repnoductive is seen ? Development is indireet.o 7 ALtennation ot qenerjation'is Sam seen. oJymorehicm in cnidaria: 7 Polymonphism is the one ob impogtant character in coelenterata. 7 he colony os hats why the where Basic colenteqata havg mary vasiain name 0tPoorcphikm means haye been iven ny and i morphe means b a PolymP 7 The hydrozoa coetenterata phylum ha, two basic bonmsfk? 0 polyp ) 7 Dibt en ent medusa z0id branches have ditt enent bunetion. Fof eyapie polyP ane tog teeding and Suimming asenual 1epjoqucti on. eotection, Meusa Serual!fhgeprbduction and this meduia developes bom Polyps. isTsA 1The polyp has a sac cylindrical like, Stauciune. ‘ Thene arte twb Kinds,. ot Polypsnm no ) Hyd0Z6tis t polye.:h bong NAnthazoan PolYP ? Meduta is the trea suoimming animal consist ot tlattened dise. ’ From its unde curtace one central Stuck that is (alled menubni um i arised ’ în co me caces the medusal ane attached by a plate iKe sHuctune called SucKert. ’ the medusa is genenally pripduced by budding bom o polyp but inKome caser the meduca can borm Hhe Q. classiicaion ot cni dartia: + The phylum cnidaria clasibied as tollow Clars Hydrozoa 7 be tresh watet, ort 9 martine t-ormgahisms may be solitany or this moH o ‘ colonial395id These may be 'sessile ort. 77 bTee,swimming Two genminal oy en ane dithi nct ec thder mendoder qenninal layerr there is gscsatdg liKe stiucture) mesóqlaea, Sho polymertphism) T GastrO vastulast caviy is 7 Larval bprtm ists preSentot an seen called planula larva CDevelopment tc indiect) pro 07 Hydra, obelia yphysaliats They all are marine and commonl Knbna ay Teilyish. 7 Mesoglea is also prtesent meduçae arre 7 Medusae staqe is domi nant Ao Planla larva stage in seen pp t ng3 7 on oads ane endodenmal g Aunelia , RhizostomaPemicolpaole class-z Anthoz0a 7hey ane as geaanseapen:t. 7 There may lbeloi be'colonial ort,, 7 Ecuively martine or solitar ortganismit oime 7gtindnicalbody 7ohly eoly roi4 stage is prietent edurat abset lo The ee toden m secrtetes calium which Carbonatenno genealiY tortmg on als yhiva9 r2 I7 Gorngonia ( seatan)i tonga voa) Vennatula Sea peni9ds (oallfum i Q. metageneiS in obeli a: ’ Obetia is'a typical Hydora, ’ it is toung in e shallon ea wate. 77Dblia col ony is attached to a qubitMatum. mony polypr 2ike he nutritivezóoids, qon0100i qs ttvns olg paoba)N8 ’ The qonozoids s responsible bon neprodüction, ’ Meduta ane toH by budding ot blastosty Ie (Reproductive Medus af ane neproducive borims and arne dioecious. ova ae prtoduced by and ovany nespectively theg the testis 7Bothe the qametet, ane neleased in sea wateq. +The nipe meduSae, uptune and Heleace the Spenm and ova in open sea water and tertiliatio takes place. ’ în some cases the spenm many. .many,e, (annied out by water to'the bemale medusae andi bettilratio Oceurs,. 7the Ferili7ed cleavog (ai vision) ot zygote and the re sutant product is. a- spherî cal, structune called batita Thene is, a, centa Cavityin blastea alle4 gsundetgorepeated Blostocoel. ’ The cell ob blastula are cated blattomnes. ’ (ome cesjgtate cavi ty in to the cavity ang th is billegnw thf stryuctune is Blactostyle> udaingy meduçat -ota103i20 o032 bnn pnivi o Sprimiovom Planulaf Gastula fBlatutaon) (arva ALternation ob qenea 2rOló) tosmtLis ’In case ob obelia the bully bongmed polypoic to brtom' itt blattostyle produces, meducat.noto2 7 the medusan ane pnoduced by asenual hepreduetion Youdaing The meduat produe Seual gametes which turther tused and ulimatel give tise to thpi ad ult body whi chis segual keploductiar Complete.s 1 Hence altennation a aenenatio genenationis the phen in which omensn has two theorganism 9negationsi-e. asexun and senualwhich alternnatt with Aach othet in i 9. coral and completirgthe itencycle. coralneebs: arte hord calareos matenials serneteq by ome eonal bortming coloDja'h (oelontetrates. 7 Some hydo704 and anthoZ04 in neal bron the conaus. Aboutaso0 siving and so0 0 tocsil (o ane Known to çecnete con teiare (or ads ls 7(orals may be ot di bt erent tortms and oith dibb erreot (olouri. St. ot cogals: Sien lenteta The singte cup wvbo 'Ke -eyosKeleton oin individu os an individu SoLitay Polyp is KnoUn as conaleite end coralites Combine together to bortmi 7 the conal is corallum. by speeial secreted ctodenmal cells ot Coelente ates Koown as calicoblasti 7 pirterteot cortal bortming dittenent Cor afit with colenterota'have vaniable shop ond Size ’ he best ilfuctnated ctructu ob a' coral is with netertence to klabellum ban (Name ot antenganiony ’ the. (onals ob this orq anigm arte cup like the peni phenal wall ot the cup Li Live SE. called theea The theca' Sunnounds ah-oral partt ot the potyp ther botto mpant is callèd basal Plate, ’ thetactér ane arised brjom mouth Types ot corals ’ Basically conals Drte wo. typetndepencing or the clats (UHydq0z0an,(ocaf it (20 An thooz 0an (oal Hydqozoan 7Panti cularty th polyp obmi Leporea and on such typ- ot coral,a Sylas t-o dnthozD0 ’ Thesé arne' 'vartioui type osott co raly cyoni um Horny orTal!7 Giorgonia 6) red tortalt Tubiporta ) Blue (orals>Helioporta om 33mo2 E) Ctong c(onalt> Thee ane alsa (alledtque conal ( may. c0<| Comb, ) Hene the ergnic ms are Commonly calleg tomb bearntig bearting ernganit mte 7The o1ganis mt ant sphenica! gelatinbut body these ane bee swimmens and - The body has pofer () or4l tnefettes poteioit P Abon al Pore 7Body is bi nadialiy ?The body wall ionen endpdeom 1 Di9esi sytem 10igettive (Senss orgon) symnetnyalsikaso netoqlea, tonsict bb oute -ctoqennand middle pgeiot. tont+s ot moutth thaf leod to an pharyng eiKe Stnuctune but sto msdaeum, 7the tentacles when prtese nt ane two in numben 7. Tentacter have speciad adhesive cell helps io 7 Captuning ood. The bod hos ribIKe stGuctunet ohich arft vìbrati| AateS Both,beual nd 4ceyual Repno uetion i, seen Muctula ticue poor ly evelopt. sjastro vacular pate is pnetent. ’ SReietal syttencineulatoriySytem etre tony and nepinatony yctem ane absent. ’ Thene ane sence orqani which ane oran in the abonal tpace. placeg, 7These ane henmaphodite 7 Development it p indinect, lanv al borm seen. ’Altennation ob qeneraion ic not seso.s! dbod 7 Regeiation'ot ore par(t is: seen. 9 Bolina , hapalia, ’ due to thf hanaegsticsomh p Athough the ehi exhi bìt bit so me nelatidnbip, with ot endarta but the it utig Slanities with ather phy'a venhavt asymme trniea! sody .ietbin) ’ AbSence ot tbjuf (ol @m. arre cotd. cotlg.5is} ’ Tentacles arre Body wall coocrt ot too kaye. ’ Absense on i otqansqstem. 337BV a) AbtiniHes wth poribera:oonst3 da ’ Simple tompaed striuctune witth wide opennirg nay be wth ot osum bl wel| devolopeg portikerta i3 meSo qertm. qenenal digetiv sycten in case of (tenopbara is similag with poniberta. 3) Abbinities with PAath elminthe: 7 poncovert qally Matt enxq body iliation ot the 7etenophona ha a' ectoderm. qt la tiniouge membrianpi arqeund the body Agact boren o which so in cáse ob plathyhtlminthes, (4) gitenence sith chlqanla:o2nobPog m 7Develop ment ot, muscuature ini Care ofefino Phorfa is clean qitteqence ui th 1eipecti to Cnidaria, in eri-ene areqiomakes, dibt a the both inthene a,ch:tea tòtuner notSeeni care tentaces are which is to gas Jbut phylun 7though (nidarfa ctenophe ra Polymotphis is ‘