"Runtii aad u weyn" Bahal badeedka Jurassic ayaa si nasiib ah looga helay madxafka

Hadhaaga la fogeeyay ee "Runtii aad u weyn" bahal qadiimi ah ayaa si lama filaan ah looga helay madxafka Ingriiska, taas oo muujinaysa mid ka mid ah hilibleyda ugu weyn ee weligood badaha badaha.

Afarta lafo waa laf dhabarta nooc aan la garanayn oo ka mid ah ugaarsiga Jurassic ee loo yaqaan pliosaur waxayna muujinayaan in xayawaanka tooreyda leh ay kori karaan ku dhawaad ​​​​50 cagood (15 mitir) dheer - laba jeer xajmiga orca (Orcinus orca). Natiijooyinka cusub ayaa si weyn dib ugu eegaya qiyaasihii hore ee cabbirka daanyeerka taariikhda hore.

"Waa wax cajiib ah in la caddeeyo in dhab ahaantii ay jiraan noocyo pliosaur ah oo aad u weyn oo ku yaal badaha dambe ee Jurassic," David Martill, oo ah borofisar ku takhasusay palaeobiology oo ka tirsan Jaamacadda Portsmouth ee UK, ayaa bayaan ku sheegay. "La yaab iguma noqon doonto haddii aan maalin uun helno caddayn cad oo muujinaya in nooca bahalnimada ahi uu xitaa ka weyn yahay."

Martill ayaa lafaha la kulmay isagoo ka dhex eegaya khaanadaha fosil ee Matxafka Hoolka Degmada Abingdon ee UK Ka dib markii uu la kulmay laf dhabarta weyn, waxaa ku wargeliyay maamulaha madxafku in saddex kale ay ku jiraan kaydinta. Fossils, kuwaas oo ka yimid Kimmeridge Clay Formation, ayaa markii hore la helay intii lagu jiray qoditaanka Warren Farm ee Oxfordshire. Waxaa laga soo saaray lacag dhigaal ah oo ku taariikhaysan ilaa 152 milyan oo sano ka hor xilligii Jurassic dabadii.

Martill iyo asxaabtiisu waxay ku qiyaaseen inay ka tirsan yihiin bahal badeed oo cabsi badan oo ka baxay ilaa 32 cagood ilaa 47 cagood (9.8 ilaa 14.4 m) dheer, taasoo ka dhigaysa pliosaur kii ugu waynaa ee abid la helo. Taas ka hor, mid ka mid ah pliosaurs-ka ugu caansan wuxuu ahaa Kronosaurus (Kronosaurus queenslandicus), kaas oo koray inta u dhaxaysa 33 ilaa 36 cagood (10 ilaa 11 mitir).

Pliosaurs waxay ahaayeen ugaarsiga ugu weyn badweynta intii lagu jiray xilligii Jurassic (201 ilaa 145 milyan sano ka hor). Waxay badaha ku daba-tageen iyagoo isticmaalaya afar xabo oo boodbood oo kale ah. Pliosaurs waxay u badan tahay inay ugaadhsadaan ugaarsada, iyagoo ka soo boodaya ugaadhsiga biyaha qoto dheer iyo mugdiga waxayna ku dhejiyeen ilko fiiqan, ka hor intaysan ku burburin qaniinyo ka xoog badan kan Tyrannosaurus rex's.

"Waan ognahay in pliosaurs-yadani ay ahaayeen xayawaan aad looga cabsado oo ku dabaalanayey badaha daboolay Oxfordshire 145-152 milyan sano ka hor," ayuu yiri Martill. "Waxay ahaayeen kuwa ugu sarreeya silsiladda cuntada badda waxayna u badan tahay inay ku dhufteen ichthyosaurs, plesiosaurs qoorta dheer iyo xitaa yaxaasyada badda yar yar, si fudud iyaga oo qaniinay kala badh oo ka qaadaya jajab."

Daraasada ayaa markii hore lagu daabacay joornaalka Tallaabooyinka Ururka Cilmi-yaqaannada. 10ka Meey, 2023.