Cnidarian vs Platyhelminthes
Qhov sib txawv tseem ceeb ntawm Cnidarian thiab Platyhelminthes yog tias Cnidarians yog diploblastic, thaum Platyhelminthes yog triploblastic, tab sis muaj lwm qhov sib txawv ntawm cov no dhau lawm invertebrates. Cnidarian thiab Platyhelminthes yog cov tsiaj qub qub tshaj plaws uas pom muaj nyob hauv Tsiaj Nceeg Vaj thiab tseem suav tias yog tsis yog chordate phyla. Lub hom phiaj ntawm tsab xov xwm no yog los piav qhia txog morphology thiab physiology ntawm Cnidarian thiab Platyhelminthes thiab sib tham txog qhov sib txawv ntawm lawv.
Cnidarian (Coelenterates) yog dab tsi?
Cnidarians yog thawj tsiaj uas muaj cov ntaub so ntswg ntawm lub koom haum, yog li hu ua metazoans tseeb. Lawv cov hlwb sib txawv los ua cov haujlwm sib txawv xws li kev zom zaub mov, kev hnov mob, kev tiv thaiv kev ua haujlwm, thiab lwm yam. Raws li cov ntaub ntawv fossil, cov kws tshawb fawb ntseeg tias cnidarians yog cov tsiaj qub tshaj plaws uas tau tshwm sim ua ntej cov sponges. Tag nrho cov cnidarians suav nrog polyp thiab medusa cov ntaub ntawv nthuav tawm radial symmetry. Lub phylum muaj li ntawm 10,000 hom thiab feem ntau ntawm lawv yog marine, tshwj tsis yog hom Hydra, uas nyob rau hauv cov dej tshiab. Cnidarians tuaj yeem nyob ib leeg (Hydra), colonial (Corals) thiab sedentary lossis tsis ua luam dej (hiav txwv anemones thiab jellyfishes).
Qhov tshwj xeeb ntawm cnidarians yog qhov muaj cov hlwb cnidoblast (los yog cnidocytes) uas pab lawv ntes cov zaub mov, adhesion thiab tiv thaiv. Lub plab zom mov extracellular tshwm sim nyob rau hauv cov kab noj hniav gastrovascular; qhov chaw nruab nrab hauv lawv lub hnab zoo li lub cev. Lub qhov ncauj ncig los ntawm lub tentacles yog siv rau ob qho tib si noj thiab egestion ntawm cov khoom pov tseg. Ua pa thiab excretion tshwm sim los ntawm yooj yim diffusion los ntawm lawv lub cev nto. Nerve system yog heev qub, muaj ib tug net ntawm paj hlwb. Qee cov tswvcuab nthuav tawm calcareous exoskeleton lossis endoskeleton. Colonial cnidarians qhia polymorphisms los ntawm kev hloov lawv lub cev rau hauv ob hom; polyp thiab medusa. Ob leeg asexual (fission los yog budding) thiab kev sib deev txoj kev sib deev muaj nyob rau hauv lub phylum no. Daim ntawv ciliated larval hu ua planula yog tsim thaum lawv lub neej voj voog.
YCoral Polyp
Platyhelminthes yog dab tsi?
Platyhelminthes (los yog flatworms) yog dorsoventrally flattened elongated mos-bodied worm zoo li invertebrates. Tag nrho cov kab mob muaj ob tog sib luag lub cev nrog lub koom haum hauv nruab nrog cev. Txog 13,000 hom muaj nyob hauv cov phyla no. Platyhelminthes yog cov tsiaj uas muaj sia nyob dawb lossis cov tsiaj txhu endoparasitic. Cov kab mob uas muaj sia nyob dawb muaj nyob hauv thaj av av lossis chaw nyob hauv dej tshiab. Cov tsiaj no tsis muaj lub cev kab noj hniav, yog li hu ua acoelomates. Lawv muaj cephalization thiab ib tug kwj dej noj, uas muaj lub qhov ncauj tab sis tsis muaj qhov quav. Tsuas yog cov ntaub ntawv nyob dawb, cov kab mob cab muaj cov cuticle tuab, uas tiv thaiv lawv lub cev los ntawm tus tswv tsev cov kua txiv hmab txiv ntoo. Cov ntaub ntawv nyob dawb ua pa ntawm lub cev thiab cov kab mob parasitic feem ntau yog anaerobic. Lub paj hlwb yog yooj yim heev nrog paj qaum thiab ganglia. Cov tsiaj nyob dawb muaj ob lub qhov muag me me ua lub hauv paus tseem ceeb ntawm lub cev. Lawv siv hooks, suckers thiab spines li adhesion lub cev. Ob leeg asexual (regeneration) thiab kev sib deev txoj kev sib deev tuaj yeem pom ntawm cov tswv cuab. Flatworms muaj xws li planarians, flukes thiab tapeworms.
kab mob
Dab tsi yog qhov sib txawv ntawm Cnidarian thiab Platyhelminthes?
• Cnidarians yog diploblastic, whereas Platyhelminthes yog triploblastic.
• Platyhelminthes muaj ob sab symmetrical, mos, zoo li cab elongated lub cev, whereas cnidarian muaj radially symmetrical, mos, medusa-zoo li los yog polyp-zoo li lub cev daim ntawv.
• Cephalization muaj nyob rau hauv Platyhelminthes, tab sis tsis nyob rau hauv cnidarians.
• Tsis zoo li cov cnidarians, Platyhelminthes muaj cov leeg ncig thiab cov leeg ntev.
• Platyhelminthes nthuav qhia lub cev-system theem ntawm lub koom haum, whereas cnidarian muaj cov ntaub so ntswg ntawm lub koom haum.
• Tsis zoo li cnidarians, Platyhelminthes muaj gonoducts thiab copulatory organ nrog lub neej nyuaj heev.
• Cnidarians suav nrog cov ntawv nyob ib leeg, sedentary thiab dawb-nyob, qhov Platyhelminthes suav nrog cov ntawv nyob dawb thiab cov kab mob cab.
• Cnidarians muaj cnidocytes, tsis zoo li Platyhelminthes.
• Piv txwv rau cnidarians suav nrog Hydra, hiav txwv anemones, jellyfish thiab coral. Piv txwv rau Platyhelminthes yog flukes, tapeworms thiab planarians.
