Daraasad dhawaan la daabacay ayaa lagu saleeyay falanqeyn lagu sameeyay dhagaxaan jira 518-milyan oo sano oo ay ku jiraan ururinta lafaha ugu da'da weyn oo ay saynisyahannadu hadda hayaan. Sida laga soo xigtay cilmi-baarista, awoowayaasha noolaha badan ee maanta nool ayaa laga yaabaa inay ku noolaayeen in ka badan 500 oo milyan oo sano ka hor Shiinaha casriga ah.
Magaalada Yunnan ee koonfur-galbeed ee Shiinaha, saynisyahannadu waxay heleen mid ka mid ah kooxihii ugu da'da weynaa ee fossils xayawaannada hadda loo yaqaan sayniska, oo ka kooban haraaga in ka badan 250 nooc.
Waa diiwaan muhiim ah oo ku saabsan Qaraxii Cambrian, kuwaas oo arkay fidinta degdega ah ee noocyada laba-geesoodka ah - makhluuqa sida xayawaanka casriga ah iyo bini-aadmiga, waxay leeyihiin qaab-dhismeed sida embriyaha, taasoo la macno ah inay lahaayeen dhinac bidix iyo midig oo ah muraayadaha midba midka kale.
Fossils ee laga helay Chengjiang Biota oo 518-sano jir ah waxaa ka mid ah Gooryaanka, arthropods (awoowayaasha shrimps, cayayaanka, caarada, iyo dabaqalloocyada), iyo xitaa vertebrates ugu horreeya (awoowayaasha kalluunka, amphibians, xamaaratada, shimbiraha, iyo naasleyda) . Natiijooyinka daraasaddan dhowaan la sameeyay ayaa daaha ka qaaday markii ugu horreysay in deegaankan uu yahay dhul-mareen badeed ah oo qani ku ah nafaqooyinka oo ay saameeyeen daadad duufaanno ah.
In kasta oo aaggu uu hadda ku yaal dhulka buuraleyda ah ee gobolka Yunnan, kooxdu waxay baadhay muunadaha xudunta u ah dhagaxyada kuwaas oo daaha ka qaaday caddaynta qulqulka badda ee deegaanka ee jiray waagii hore.
"Qaraxa Cambrian hadda waa loo aqbalayaa inuu yahay dhacdo horumar degdeg ah oo dhab ah, laakiin arrimaha sababay dhacdadan ayaa muddo dheer laga dooday, iyada oo mala awaal ku saabsan deegaanka, hidde-socodka, ama kiciyeyaasha deegaanka," ayuu yiri qoraa sare Dr. Xiaoya Ma, oo ah palaeobiologist oo ka tirsan Jaamacadda Exeter iyo Yunnan University.
"Soo-helidda deegaan-daaqeedka ayaa iftiiminaya iftiin cusub oo ku aaddan fahamka sababaha suurtogalka ah ee kobcinta bulshooyinka badda ee labada xayawaan ee Cambrian ay u badan yihiin iyo ilaalintooda jilicsan ee jilicsan."
"Dhibaatooyinka deegaanka ee aan xasilloonayn waxay sidoo kale gacan ka geysan karaan shucaaca la qabsiga ee xayawaankan hore."
Qoraaga hogaamiyaha ah Farid Saleh, oo ka tirsan jaamacadda Yunnan, ayaa yidhi: "Waxaan ka arki karnaa ururka qulqulo badan oo sedimentary in deegaanka martigelinaya Chengjiang Biota uu ahaa mid adag oo hubaal ah inuu ka qoto dheer yahay wixii hore loogu soo jeediyay suugaanta ee bulshooyinka xayawaanka la midka ah."
Changshi Qi, oo ah qoraa kale oo isla-hoggaaminaya ahna geochemist Jaamacadda Yunnan, ayaa ku daray: "Cilmi-baadhisyadayadu waxay muujinayaan in Chengjiang Biota ay inta badan ku noolayd deegaan-biyood-gacmeed oo si wanaagsan loo yaqaanay."
"Daadadka duufaantu waxay u qaadeen noolahaan ilaa meelaha hoose ee hoose ee ogsijiin-yarida, taasoo keentay ilaalinta gaarka ah ee aan aragno maanta."
La-qoraa Luis Buatois, paleontologist iyo sedimentologist ee Jaamacadda Saskatchewan, ayaa yiri: "Chengjiang Biota, sida kiiska xayawaannada la midka ah ee lagu sharraxay meelo kale, waxaa lagu keydiyaa kaydad wanaagsan."
"Fahamkayaga sida dhoobadaan dhoobada ah loo xareeyay ayaa si weyn isu beddeshay 15kii sano ee la soo dhaafay."
"Codsiga aqoontan dhowaan la helay ee daraasadda kaydadka fossiliferous ee ilaalinta gaarka ah waxay si weyn u beddeli doontaa fahamkayaga sida iyo halka ay ku urursan yihiin sediffions."
Natiijooyinka cilmi-baaristu waa kuwo muhiim ah sababtoo ah waxay muujinayaan in badi noocyada hore ay awoodeen inay la qabsadaan bay'ad adag sida isbedbedelka milixda iyo xaddi badan oo fadhiid ah.
Tani waxay ka soo horjeedaa natiijooyinka cilmi-baaris hore, oo soo jeediyay in xayawaanka leh dabeecadaha isku midka ah ay gumaystaan biyaha qoto dheer iyo deegaanka badda oo leh xasilooni weyn.
"Way adag tahay in la rumaysto in xayawaankani ay awoodeen in ay la qabsadaan jawiga deegaanka ee walaaca leh," ayuu yiri M. Gabriela Mángano, paleontologist at the University of Saskatchewan, oo bartay goobo kale oo si fiican loo yaqaan ee ilaalinta gaarka ah ee Kanada, Morocco, iyo Greenland.
Maximiliano Paz, oo ah dhakhtar sare oo ka tirsan Jaamacadda Saskatchewan oo ku takhasusay hababka miraha wanaagsan, ayaa ku daray: "Helitaanka koofiyadaha dhoobada ah ayaa noo ogolaatay inaan aragno faahfaahinta dhagaxa kuwaas oo inta badan ay adag tahay in la qadariyo meelaha cimilo ahaaneed ee aagga Chengjiang."
Wargeyska, oo lagu daabacay wargeyska Nature Communications, ayaa cinwaankiisu yahay: "Chengjiang Biota waxay degganaayeen deegaan deltaic ah"
