10 Mienzaniso yeOvoviviparous Mhuka - Encyclopedia

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Mienzaniso yemhuka dze ovoviviparous

Iyo ovoviviparous mhuka ndeaanokura mukati mezai asati azvarwa. Asi chinosiyanisa ovoviviparous ndechekuti zai rinoramba riri mukati maamai kusvikira iyo nhumbu yakwana. Ndokusaka mhuka ichibuda muzai pakarepo mushure mekunge zai raiswa. Inogona kutsemura kubva muzai riri mukati memuviri waamai uye yozozvara.

Izvo zvakakosha kusiyanisa ovoviviparous mhuka kubva kune dzimwe mhuka dzinovandudzawo mazai avo mukati memazai, iyo oviparous. Iwo ekupedzisira anoisa mazai avo munzvimbo yekunze pakutanga kwekukura kwembryoni. Mune mamwe mazwi, mazai aya anokura kunze kwemuviri waamai.

Vanofanirawo kusiyaniswa kubva mhuka dzinovaraidza, ayo ari avo vane "embryo" inokura mukati memuviri waamai, semhuka dzinoyamwisa. Kunyangwe iyo viviparous ichikudziridzawo "embryo" mukati, mutsauko ndewekuti sezvo yakafukidzwa nehombodo, haigone kupihwa yakananga naamai.

Ndokureva kuti:

Pfungwa yakajairika pakati peovoviviparous uye oviparous: Iyo embryo inodzivirirwa nehombodo.
Pfungwa yakajairika pakati peovoviviparous uye viviparous: Fertilization inoitika mukati memuviri waamai, uko "embryo" inokura zvakare.

Mienzaniso yemhuka dze ovoviviparous

White shark: Rudzi rwehombe hombe uye yakasimba. Ine muromo we arched. Inofanira kushambira nguva dzose (haigoni kuramba yakanyarara) kuitira kuti ifeme uye ifambe, nekuti haina dundira rekushambira. Mazai aya anodyisa kuburikidza neiyo yolk. Shark iyi haikandira mazai asi iyo diki inochochonya mukati maamai yozozvarwa yakura.
Boa constrictor: Reptile iyo inogona kuyera pakati pe0,5 ne4 metres, zvinoenderana nesapppecies. Mukuwedzera, vakadzi vacho vakakura kudarika varume. Iyo yakatsvuka uye chena, kana tsvuku uye shava, ine misiyano zvichienderana nes subspecies. Inobatana munguva yekunaya. Kubata kwayo kunotora mwedzi yakati wandei. Kutsemurwa kwemazai kunoitika mukati memuviri waamai, kutsemura vana vatokura kare.
Huchi: Rudzi rwekashark kadiki, inosvika pamusoro pemamita pakureba. Inoonekwa nekuve nemaronda ane chepfu pamusoro pemuviri. Ndiyo mhando yakawanda kwazvo ye shark asi iine kuganhurirwa kugovera. Marara ekubereka anoenderana nesaizi yechikadzi, nekuti zvakajairwa mazai 1 kusvika makumi maviri pakubata, asi vakadzi vakuru vanogona kuva nemarara akawanda. Ivo vanozvarwa kunze kwezai.
Stingray (hofori gumbeze): Rinosiyaniswa kubva kune mamwe marudzi nekuti harina chinobaya chine chepfu pamuswe waro. Zvakare nekuda kwehukuru hwayo hukuru. Anogara mumakungwa akadzikama. Iyo inokwanisa kusvetuka ichibuda mumvura. Panguva yekuzvara, vanoverengeka vanhurume vanokwenya mukadzi. Kuti mumwe wavo asvike pakubata, anofanira kuuraya vakwikwidzi vake. Inofungidzirwa kuti nguva iyo mazai anoramba ari mukati memukadzi inogona kudarika mwedzi gumi nembiri. Vane mumwe kana vaviri vadiki pamarara.
Anaconda: Rudzi rwe constrictor nyoka. Inogona kuyera kusvika kumamita gumi pakureba. Kunyangwe isinga gare muboka asi nenzira yega, kana hadzi ichida kubereka inogona kukwezva murume nekuburitsa pheromones. Mumarara ega ega pakati pevane makumi maviri kusvika makumi mana vadiki vanozvarwa, angangoita 60 cm kureba.
Suriname toad: Amphibian inogara munzvimbo dzinopisa uye dzinopisa. Iyo inoratidzirwa nemuviri wayo wakapetwa uye hwaro hwayo hwakafa, hutatu. Ruvara rwayo nderegirini grey. Icho chakakosha mhando ye ovoviviparous mhuka, nekuti kusangana kunoitika kunze kwemuviri waamai. Kana yangobatwa, mukadzi anoisazve mazai mumuviri wake. Kusiyana nemamwe maamphibian, ayo anozvarwa semaruva uye ozoita metamorphosis, ichi chigunwe chinoita kukura kwadzo semaruva mukati mezai, uye vanhu vanozvarwa vatove nehunhu hwekupedzisira.
Platypus: Inoonekwa seyemhuka, asi inoisa mazai, saka inogona kuverengerwa seovoviviparous. Imhuka yemumvura-inogara kumabvazuva kweAustralia neTasmania. Inotaridzika nechitarisiko chayo, nemhino yakafanana nemuromo wedhadha, semuswe webeaver, uye makumbo akafanana neotter. Iyo ine muchetura.
Jackson Trioceros: Mhando dze ovoviviparous chameleon. Ine nyanga nhatu, ndosaka ichinzi "trioceros". Anogara muEast Africa. Vechidiki vanozvarwa vari marara pakati pe8 uye 30 makopi, aine gestation inosvika kumwedzi mitanhatu.
Hippocampus (seahorse): Ndirwo rudzi rwe ovoviviparous, sezvo mazai asingakure mukati memuviri wechikadzi asi mumuviri wechirume. Kuberekesa kunoitika apo mukadzi anopfuudza mazai muhomwe yechirume. Iyo saga yakafanana neyeye marsupials, ndiko kuti, ndeyekunze uye ventral.
Lution (Crystal shingles): Yakanyanya mhuka, sezvo iri gadzi risina gumbo. Kureva kuti pakuonekwa yakafanana nenyoka. Zvisinei, zvinozivikanwa kuti idzvinyu nekuti pane zvisaririra zvemapfupa aro mumuviri waro ane hunhu hwedzvinyu. Zvakare, ine maziso anotakurika, kusiyana nenyoka. Icho chinokambaira chinogara muEurope uye chinogona kusvika kusvika masendimita makumi mana, kana masendimita makumi mashanu muvakadzi. Kubereka kunoitika muchirimo. Mushure memwedzi mitatu kana mishanu yekubata, hadzi inoisa mazai nevechidiki mukati, uye kutsemuka kunoitika ipapo ipapo.