Starfish belong to the phylum echinoderms, class asteroidea, ua los ntawm ntau tshaj 7000 hom tsiaj,tag nrho cov keeb kwm dej hiav txwv Tsis muaj hom kab mob echinoderms uas nyob hauv dej tshiab, vim lawv xav tau dej ntsev rau kev tswj osmotic ntawm lawv lub cev. Lwm pab pawg neeg paub zoo ntawm echinoderms yog hiav txwv urchins thiab hiav txwv cucumbers.
Nyob hauv tsab xov xwm no peb yuav los tshuaj xyuas qhov neej neeg ntawm lub hnub qub, peb yuav tham txog lawv lub cev yam ntxwv, lawv li cas? txav mus, lawv noj dab tsi thiab yuav ua li cas thiab lwm yam uas xav paub ntau yam xws li, piv txwv li, yog cov ntses hnub qub hermaphrodites?
Starfish muaj endoskeleton ua los ntawm daim hlau, hu ua ossicles los yog sclerites. Nws yog ib qho ntawm txhua qhov echinoderms. Cov tsiaj muaj ib txheej ntawm cov ntaub so ntswg epidermal hauv qab no uas peb pom cov dermis, qhov twg ossicles ntawm calcareous keeb kwm yog immersed, uas, nyob rau hauv starfish, articulate nrog ib leeg. Feem ntau cov ossicles no muaj pob txha los yog pob uas ua rau tus tsiaj spiky look
ntses hnub qub txav li cas?
Ib qho ntawm kev hloov pauv ntawm cov ntses hnub qub thiab tag nrho cov echinoderms yog lawv muaj aquifer lossis ambulacral system, uas pab lawv txav, ntes zaub mov, thiab ua pa. Cov txheej txheem no muaj cov txheej txheem ntawm cov raj lossis cov kab sab hauv uas cuam tshuam nrog cov khoom siv, lossis tube taw, nyob rau saum npoo ntawm tus tsiaj.
Cov kwj dej no muaj dej hiav txwv puv nkaus. Nyob rau hauv lub dorsal cheeb tsam ntawm lub hnub qub ntses muaj ib phaj hu ua madreporito, uas sib txuas lus nrog sab nraud nrog lub hnub qub lub ambulacral system, qhov no yog qhov chaw uas cov dej nkag mus rau hauv lub hnub qub. set ntawm ducts. Thaum kawg dej tawm los ntawm lub raj taw.
Cov txheej txheem no ua haujlwm zoo ib yam li hydrostatic skeletons (hydroskeleton): nws siv dej los ntawm ib puag ncig sab nraud los ntawm madreporite thiab lub siab generated nyob rau hauv lub internal kab noj hniav ua hauj lwm pab txav lub raj taw.
Starfish khoom noj
Lub plab zom mov feem ntau yog lub qhov ncauj nyob hauv qhov chaw ventral, uas yog, lub qhov ncauj ntawm cov ntses hnub qub yog hauv qab lawv lub cev, tiv nrog av. Lawv kuj muaj lub plab uas thim rov qab, ua rau nws sab hauv ua rau sab nrauv, thiab txoj hnyuv ncaj nraim uas xaus rau hauv qhov quav, uas yuav tsis muaj nyob.
Starfish uas tsis tuaj yeem rub lawv lub plab tawm ntawm lub cev, yuav tsum pub me me los yog tsiaj me los yog zaub. Ib yam li ntawd, cov hnub qub uas tuaj yeem thim rov qab lawv lub plab tuaj yeem noj cov tsiaj loj dua, xws li ntses los yog molluscs, vim plab zom mov tshwm sim sab nraum lub cev.
Starfish reproduction and their lifecycle
Kom kom nkag siab zoo dua life cycle of starfish peb yuav tsum paub tias cov echinoderms no muaj poj niam deev dioecious, uas yog, muaj txiv neej thiab poj niam, tsis tshua muaj hom hermaphrodite. Lawv muaj lub voj voog me me, cov tib neeg tshiab mus txog ob theem ua ntej nyob rau hauv qab hiav txwv li cov hnub qub laus.
1. Fertilization thiab tsim cov zygote
Starfish muaj external fertilization, yog li txiv neej thiab poj niam tso lawv cov qe thiab phev, raws li sab nrauv. Cov phev thiab cov qe no sib txuas lus nyob rau hauv ib puag ncig marine ua rau fertilization ntawm cov qe thiab tom qab tsim ntawm lub zygote
Qee hom muaj peev xwm rov tsim tau thoob plaws lub xyoo thiab lwm tus tsuas yog ua thaum lub sijhawm tshwj xeeb.
ob. Larval theem
Thaum lub zygote tau tsim, nws hloov ob peb feeb mus rau hauv ib qho embryo thiab los ntawm no, ib tug larva twb tsis tsim. ntau lub sij hawm dhau mus.
Starfish muaj tsib hom larvaenyob ntawm hom: bipinnaria, brachiolaria, brachiolaria, chim-shaped larva thiab larva tsis muaj brachiolaria. Qee hom yuav tsuas muaj ib hom larva thaum lawv loj hlob, thiab lwm hom yuav muaj ntau hom larva thaum lawv loj hlob.
Cov me me larvae wander li planktonic kab mob rau hnub los yog lis piam hauv dej hiav txwv, pub rau plankton me dua lawv tus kheej. Qee lub sij hawm, qhov kawg ntawm larval theem ua ntej nkag mus rau theem me nyuam yaus tsis tas yuav pub thiab tsuas yog taug kev mus txog thaum nws pom qhov chaw tsim nyog.
Sab tsi muaj larval stage
Qee lub hnub qub tsis muaj larval theem thaum lawv loj hlob. Hloov chaw, nws muaj theem hu ua mesogen. Cov hnub qub no ncaj qha los ntawm embryo mus rau cov menyuam yaus.
3. Juvenile Status
Tau metamorphosis, yog muaj ib tug larval theem, los yog morphogenesis, yog hais tias cov tsiaj mus txog theem mesogen, cov me me los ua cov hluas. Lawv twb yuav muaj cov neeg laus lawm, tab sis me me thiab tseem yuav tsis tau fertile.
Qee cov kev tshawb fawb qhia tias cov larvae lossis mesogens nyiam los ntawm pheromones tso tawm los ntawm cov neeg laus ntawm lawv cov tsiaj los tsim lawv tus kheej hauv feem ntau. tsim nyog.
4. Adult Status
Tom qab ib ntus, cov menyuam yaus yuav ncav cuag qhov hnyav ntawm cov hnub qub hnub qub thiab yuav rov tsim dua. Raws li peb tau hais, cov ntses hnub qub muaj kev sib deev sib deev thiab yug me nyuam ntawm deev hluas nraug, txawm hais tias qee hom muaj peev xwm rov tsim dua ntawm Nws yog qhov txawv txav, thiab feem ntau tshwm sim thaum lub sijhawm tsis zoo, piv txwv li thaum tus tsiaj tua tsiaj tawm tsam lawv.
Yog lawv plam ib txhais caj npab, yuav ua rau ib tug lub hnub qub tshiab genetic zoo tib yam rau tus qub. Tsis tas li ntawd, tus thawj yuav tuaj yeem cog caj npab tshiab.
Ntau txog hnub qub
Tam sim no koj paub txog lub neej voj voog ntawm cov ntses hnub qub, lawv cov kev yug me nyuam thiab lub neej theem. Koj puas xav paub ntau ntxiv txog cov tsiaj hauv hiav txwv? Tom qab ntawd peb caw koj los tshawb pom cov tsiaj txhu uas muaj kev puas tsuaj ntawm Great Barrier Reef, cov ntses hnub qub yog ib qho ntawm lawv.
