The reproduction of molluscs is as diverse as the different types of molluscs that exist. Cov tswv yim kev yug me nyuam hloov pauv nyob ntawm hom ib puag ncig uas lawv nyob, txawm tias lawv yog cov tsiaj hauv av los yog cov tsiaj hauv dej, txawm tias txhua tus me nyuam los ntawm kev sib deev.
Nyob hauv tsab xov xwm no peb yuav piav qhia kom ntxaws mollusks reproduce, tab sis ua ntej peb yuav piav qhia tias mollusks tiag tiag yog dab tsi, qee qhov cov yam ntxwv tseem ceeb thiab cov ntsiab lus ntawm koj lub cev xeeb tub. Ib yam li ntawd, peb yuav piav txog ob qho piv txwv ntawm kev yug me nyuam hauv molluscs raws li lawv hom.
mollusks yog dab tsi? - Hom thiab piv txwv
Molluscs yog ib tug loj phylum ntawm invertebrate tsiaj, yuav luag ntau npaum li arthropods. Muaj ntau hom mollusks, tab sis lawv txhua tus muaj qee yam uas ua rau lawv zoo sib xws, txawm tias txhua tus muaj nws tus kheej hloov kho.
Cov yam ntxwv uas peb tab tom tham txog yog suav nrog hauv kev faib nws lub cev, faib ua plaub thaj chaw:
- A cephalic area
- Lawv muaj ib tug locomotor ko taw cov leeg heev rau kev nkag. Cov ko taw no tau hloov kho hauv qee pawg, xws li cephalopods, uas nws ko taw hloov mus rau hauv tentacles.
- Nyob hauv thaj chaw tom qab peb pom cov palal kab noj hniav, qhov twg cov kab mob olfactory thiab cov gills (nyob rau hauv cov molluscs ntawm dej nyob rau hauv lub neej) yog. pom. thiab lub cev orifices xws li lub qhov quav.
- Tau kawg, the mantle. Nws yog lub dorsal nto ntawm lub cev uas secretes tiv thaiv, xws li spicules, lub plhaub los yog venom.
Hauv cov hom molluscs, muaj qee cov chav kawm tsawg dua, xws li chav kawm Caudofoveata lossis chav kawm Solenogastrea. Cov no molluscs yog tus cwj pwm los ntawm kev ua kab mobthiab lub cev tiv thaiv los ntawm spicules.
Qee cov molluscs nthuav tawm ib qho tseem ceeb heev morphology, ib yam li cov ntaub ntawv ntawm cov molluscs teej tug mus rau cov chav kawm Monoplacophora thiab Polyplacophora. Cov tsiaj no muaj cov leeg nqaij zoo li cov qwj thiab lawv lub cev muaj kev tiv thaiv los ntawm ib lub plhaub, hauv thawj kis, lossis los ntawm ob peb lub thib ob. Tus qub zoo ib yam li tus clam uas muaj ib lub plhaub, thiab lub tom kawg zoo li tus arthropod uas paub zoo, tus kab mob sow.
Lwm cov molluscs yog fang plhaub uas, raws li lawv lub npe qhia, muaj lawv tag nrho cev tiv thaiv los ntawm fang-shaped plhaub ntxhw. Lawv nyob rau hauv chav kawm Scaphopoda thiab yog tag nrho cov tsiaj hauv hiav txwv.
Thiab peb tuaj rau cov hom molluscs uas paub zoo tshaj plaws: bivalves, xws li clams, oysters lossis mussels. Gastropods, qwj thiab slugs. Thiab thaum kawg, cephalopods, uas yog octopus, cuttlefish, squid thiab nautilus.
Yog koj xav delve rau hauv lub ntiaj teb no ntawm molluscs, koj yuav tsis nco peb tsab xov xwm "Types ntawm molluscs - yam ntxwv thiab piv txwv".
Nyob rau hauv xws li ib pawg tsiaj heterogeneous uas, ntxiv rau, tuaj yeem nyob hauv ntau qhov chaw sib txawv, cov tswv yim kev loj hlob uas lawv tau hloov pauv muaj ntau yam sib npaug. los ntawm
sexual reproduction , uas yog, nyob rau hauv txhua hom muaj unisexual tus neeg, poj niam molluscs los yog txiv neej molluscs. Txawm li cas los xij, qee hom yog hermaphrodite thiab, txawm hais tias feem ntau tsis tuaj yeem ua rau nws tus kheej fertilize (lawv xav tau muaj lwm tus neeg), qee hom muaj peev xwm, xws li qee cov av qwj. Feem coob ntawm cov mollusk hom yog cov dej thiab, nyob rau hauv ib puag ncig no, hom fertilization tseem ceeb yog sab nraud. Tsuas yog qee hom muaj
fertilization sab hauv, xws li cephalopods. Yog li ntawd, dej molluscs nthuav tawm sab nraud fertilization. Ob tus poj niam thiab cov txiv neej tso lawv cov gametes rau hauv ib puag ncig, cov no yog fertilized, loj hlob, hatch thiab nyob li dawb larvae mus txog rau thaum cov neeg laus, uas nyob rau hauv ib co hom yog xyaum sessile los yog nkag thiab nyob rau hauv lwm yam free swimmers. Lav molluscs, uas yog pulmonate gastropods los yog av snails, muaj ib tug Txhua tus neeg muaj ob tug poj niam, tab sis tsuas yog ua tau raws li ib tug nyob rau hauv lub sij hawm ntawm copulation.. Tus txiv neej qhia cov phev los ntawm qhov chaw mos hauv tus poj niam uas lub qe yuav fertilized. Tus poj niam mam li nteg qe faus rau hauv av uas lawv yuav loj hlob.
Piv txwv ntawm kev yug me nyuam hauv molluscs
Tus naj npawb ntawm ntau hom molluscs nyuaj rau kev sib txuas ntawm kev piav qhia ntawm lawv cov kev yug me nyuam, vim li no peb nthuav tawm ob qho piv txwv ntawm cov mollusc yug me nyuam:
1. Kev yug me nyuam ntawm cov qwj ntau (Helix aspersa)
NOJ QAB RAU OB LUB CAIJ NTUJ UAS YUAV UA LI CAS, ZAUB NCAUJ ib leeg. Lub rooj sib tham no muaj ntau lub voj voog ncig, kev sib txhuam thiab cov tshuaj hormones tso tawm uas tuaj yeem kav ntev txog 12 teev.
Thaum cov qwj nyob ze heev, lawv tso lub npe hu ua hlub dart. Cov qauv no yog qhov tseeb chitinous darts impregnated nrog cov tshuaj hormones uas nkag mus rau ntawm daim tawv nqaij ntawm cov qwj thiab nyiam kev loj hlob zoo. Tom qab lub dart, ib tug qwj protrudes tus noov los ntawm nws genital pore thiab nkag mus rau hauv tus khub lub pore, txaus kom nws thiaj li tso cov phev.
Tom qab ob peb hnub, tus tsiaj fertilized yuav ntxig nws lub taub hau rau hauv cov av ntub thiab tso nws cov qe rau hauv ib lub zes me me. Tom qab ib pliag, ib puas me me qwj yuav tawm ntawm nws.
ob. Kev yug me nyuam ntawm oysters
Feem ntau, thaum lub caij sov tuaj txog thiab dej hiav txwv , nws yog lub sij hawm rau oysters yug me nyuam. Cov tsiaj no tso cov pheromones rau hauv dej uas qhia txog lawv qhov kev loj hlob. Thaum zoo li no, ob tug txiv neej thiab poj niam oysters tso tawm ntau lab gametes uas yuav fertilize sab nraum lawv lub cev.
Kev loj hlob ntawm cov qe yog vertiginous, nyob rau hauv ob peb teev lawv nkag mus rau hauv lub xeev ntawm larva. Ob peb lub lis piam tom qab, lawv poob rau hauv qab pob zeb, feem ntau yog coj los ntawm cov tshuaj cues los ntawm lwm cov neeg laus oysters. Lawv txuas rau substrate siv cov cement lawv tsim lawv tus kheej thiab yuav siv lawv lub neej nyob ntawd.
