Ezincancisayo: inkcazo emfutshane

Ukuza kuthi ga ngoku, ezanyisayo zithathwa ngomnye kwiiklasi eziphambili. Eli qela iphawulwa eziliqela iimpawu ezibalulekileyo. Ngokoqikelelo lezifundo ezaziwayo ehlabathini namhlanje kukho ngaphezu amawaka amahlanu amalungu iklasi. Nangona kubalulekile ukukhumbula ukuba eli nani kulinganisiwe kakhulu, ngenxa yokuba izazinzulu kwaye bafuna iintlobo ezintsha ukuza kuthi ga ngoku.

Ezincancisayo kunye usasazo

Ezanyisayo zithathwa abameli ezizodwa kakhulu zezilo. Baya kuthunyelwa ehlabathini lonke.

Abameli beli iklasi inokufumaneka phantse zonke iindawo zokuhlala ezinkulu yomhlaba. Ezi izilwanyana izidalwa ezintle eshushu, eyomileyo kwintlango kwemozulu kwimimandla yasezintabeni. Uyakwazi ukubona kubo kwiingingqi ezibandayo kunye namahlathi emvula emvula. Ithandwa kwezona meko emanzini.

Mhlawumbi iindawo kuphela nga nelinabemi ezanyisayo ngaphakathi kummandla Antarctica kunye nenxalenye enzulu elwandle.

Okubangel 'umdla kukuba, indawo lonikezelo lwe monotremes izilwanyana (umzekelo, i-platypus) ibonakala ngokucacileyo kuphela imimandla of New Guinea ne Australia. Abameli Marsupials zikhutshwe kwiziqithi Oceania, ngokunjalo kwi Australia yaye kummandla aseMerika. Okunye okunika umdla kukuba kwilizwekazi Australian kwakuhlala ezanyisayo kuphela ezimbalwa placental phambi kokufika kwabantu bokuqala.

Ezincancisayo: iimpawu eziphambili beklasi

Njengoko sele kukhankanyiwe, eli qela izilwanyana lineqela neempawu ezizodwa, ebonisa inqanaba eliphezulu lombutho:

• ezincancisayo Phantse viviparous.
• Iimazi ndimanyise ubisi babo ekuveliseni amadlala ezithile (endleleni, ngenxa oku ezanyisayo igama lazo).
• Abameli yeklasi babe entlonzeni ethile, ukwenza sebaceous kunye nokubila namadlala.
• Kuba ekuthiwa-homeotherms mammalian boqobo, okanye ezinegazi elishushu - ubushushu bomzimba wabo komntu akuxhomekekanga ekuzithandeleni iimeko lobushushu voice.
• Into ecace ngokukodwa ezibalulekileyo eli qela nezilwanyana a ingqondo ephuhliswe kakuhle, ingakumbi, inxalenye yokugqibela kuyo. Nantsi iziko apho abameli badla ukuba ukuziphatha entsonkothileyo kakhulu.
• Xa ezanyisayo kwakhiwa auricle, indlebe emisele engaphandle, kwakunye nazo zonke amathathu ossicles ezikhalayo, leyo, ngokuzenzekelayo, ukuba ilungiswe mandible.
• Kuba amalungu odidi luphawulwa intliziyo-zawo ezine eziphambili kunye arch aortic ekhohlo, nebonelela ukwahlulwa igazi lwemithambo kunye emithanjeni (umzekelo, xa ezirhubuluzayo kunye lwemithambo yegazi esimbaxa kugalelwe entliziyweni).
• A isici esasenza kungathathwa kunye nesakhiwo alveolar emiphungeni.
• Ngaphezu koko, kukho umahluko isakhiwo iiseli - iiseli ezibomvu yezi zilwanyana musa ayiqulathanga nuclei, ngombala sokuphefumla.
• Ezanyisayo babe omqolo ezisixhenxe kummandla wesibeleko.
• Kuba amalungu ale zodidi luphawulwa uhlobo amazinyo (ubukho siphume, canines, imihlathi). Kulo mzekelo nge iingcambu amazinyo sokuvalwa ithambo emhlathini.

Imvelaphi ezanyisayo

Izazinzulu zikholelwa ukuba iminyanya ezanyisayo mihla baba izirhubuluzi ebonakala Paleozoic. Ezi zilwanyana kunjalo igcinwe azifane kunye eziphila emhlabeni nasemanzini, ngokukodwa, phambi unamadlala ulusu kunye nebar Occipital condyle kabini.

Ingakumbi nezizalwane neentlobo zezidalwa ezincancisayo ezi-ezifana banamhlanje ingqalelo. Abameli beli qela luphawulwa phambi amazinyo ezahlukeneyo (imihlathi, siphume kunye canines). Engasentla kunye nemihlathi asezantsi abazibandakanyileyo ithambo eyodwa yaguquka yayi ossicles mammalian eziviwayo. Kodwa abameli esanyisayo ezifana zaphela i Upper Triassic.

Sele kwixesha സോഫ്റ്റ്വെയര് isoftwe, kwabakho ukwahlukana kweentlobo live-ethwele kwezo amalungu bayibeke amaqanda.

Enyanisweni, ukuqulunqa ngokucacileyo ingcamango imvelaphi ezanyisayo akunakwenzeka, kuba nanamhla, paleontologists kunye nezinye iingcali zenzululwazi ngenkuthalo uphando kule ndawo.