Mesaletsa ea khale ea tlhapi ea Elpistostege e fumanoeng Miguasha, Canada e senotse lintlha tse ncha mabapi le hore na letsoho la motho le bile teng joang ho tsoa mapheong a tlhapi.
Sehlopha sa machaba sa litsebi tsa paleonto se tsoang Univesithing ea Flinders e Australia le Universite du Quebec a Rimouski naheng ea Canada se senotse hore mohlala oa tlhapi o fane ka sehokelo se sieo sa tlhapi le phetoho ea tetrapod, kaha litlhapi li ile tsa qala ho ts'oara libakeng tse kang metsi a sa tebang le mobung nakong ea ho hlaka. nako ea Late Devonian lilemong tse limilione tse fetileng.
Tlhapi ena e felletseng ea bolelele ba limithara tse 1.57 e bontša skeleton ea letsoho le felletseng (pectoral fin) khetlo la pele tlhapi efe kapa efe ea elpistostegalian. Ho sebelisa matla a phahameng a CT-scans, skeleton ea pectoral fin e ile ea senola boteng ba humerus (letsoho), radius le ulna (forearm), mela ea carpus (letsoho) le phalanges tse hlophisitsoeng ka linomoro (menoana).
Ho ea ka John Long, Moprofesa oa Leano la Palaeontology Univesithing ea Flinders ho sibolloa ha mohlala o felletseng oa tlhapi e kang tetrapod e bitsoang Elpistostege, ho senola tlhahisoleseling e ncha e makatsang mabapi le ho iphetola ha letsoho ha lesapo la mokokotlo.
“Lena ke lekhetlo la pele re fumana ka ho hlaka menoana e notletsoeng ka har’a lepheo le nang le mahlaseli a mapheo tlhapi leha e le efe e tsebahalang. Lipalo-palo tse hlahang lepheong li tšoana le masapo a menoana a fumanoang matsohong a liphoofolo tse ngata.”
Porofesa Long o ne a bolela jaana: “Seno se se bonweng se busetsa kwa morago gore dibopiwa tse di nang le lesapo la mokokotlo di simologile kae, mme e re bolelela gore mokgwa wa letsogo o o nang le lerapo la mokwatla o simolotse go tsenelela mo tlhabologong, pele fela ditlhapi di tswa mo metsing.
Phetoho ea litlhapi hore e be li-tetrapods - liphoofolo tse nang le lesapo la mokokotlo tse maoto a mane tseo batho e leng karolo ea tsona - e bile e 'ngoe ea liketsahalo tsa bohlokoa nalaneng ea bophelo.
Liphoofolo tse nang le masapo a mokokotlo (liphoofolo tse mokokotlong) li ile tsa khona ho tloha metsing le ho hapa naha. E le ho phethahatsa phetoho ena- e 'ngoe ea liphetoho tsa bohlokoa ka ho fetisisa e ne e le ho fetoha ha matsoho le maoto.
E le ho utloisisa ho iphetola ha lintho ho tloha ho lepheo la tlhapi ho ea ho setho sa tetrapod, litsebi tsa paleonto li ithuta ka mesaletsa ea litlhapi tse entsoeng ka lobe le li-tetrapods ho tloha Middle and Upper Devonian (lilemo tse limilione tse 393-359 tse fetileng) tse tsejoang e le 'elpistostegalian'.
Tsena li kenyelletsa Tiktaalik e tsebahalang ea Arctic Canada, e tsejoang feela ka mehlala e sa fellang.
Sengoli-'moho Richard Cloutier oa Universite du Quebec a Rimouski o re lilemong tse leshome tse fetileng, mesaletsa e tsebisang phetoho ea tlhapi-to-tetrapod e thusitse ho utloisisa hamolemo liphetoho tsa anatomical tse amanang le ho hema, ho utloa le ho fepa, ha sebaka sa bolulo se fetoha ho tloha metsing ho ea ho naha. lefatsheng.
Tšimoloho ea linomoro e amana le ho hōlisa matla a hore litlhapi li khone ho boloka boima ba tsona metsing a sa tebang kapa maetong a makhutšoane a ho ea naheng. Palo e ntseng e eketseha ea masapo a manyenyane lepheong le lumella lifofane tse eketsehileng tse tenyetsehang hore li atolose boima ba lona ka lepheo.”
"Likarolo tse ling tseo phuputso li li senotseng mabapi le sebopeho sa lesapo le kaholimo la letsoho kapa humerus, e bonts'ang likarolo tse teng tse arolelanoang le liphoofolo tsa khale tse phelang metsing. Elpistostege ha se hakaalo-kaalo hore ke moholo-holo oa rōna, empa e haufi le ho feta moo re ka fihlelang 'mesaletsa ea khale ea phetoho', e leng sebaka se pakeng tsa litlhapi le li-tetrapod. "
Elpistostege e ne e le sebata se seholo ka ho fetisisa se phelang leoatleng le sa tebang ho ea sebakeng sa leoatle sa Quebec lilemong tse limilione tse 380 tse fetileng. E ne e e-na le meno a matla a bohale molomong oa eona hoo e neng e ka khona ho iphepa ka litlhapi tse ngata tse seng li nyametse tse entsoeng ka mapheo a lobe tse fumanoeng li fossilized sebakeng se tšoanang.
Elpistostege qalong e ne e rehiloe ho tloha karolong e nyane ea marulelo a lehata, e fumanoeng mafika a fossiliferous a Miguasha National Park, Quebec, mme a hlalosoa ka 1938 e le oa tetrapod ea pele.
Karolo e 'ngoe ea lehata la sebata sena se makatsang e ile ea fumanoa 'me ea hlalosoa ka 1985, ho bontša hore e ne e hlile e le tlhapi e tsoetseng pele ea lobe-finned. Mohlala o mocha o makatsang oa Elpistostege o ile oa sibolloa ka 2010.
Thuto e qalileng e hatisitsoe koranteng Nature. La 18 Hlakubele 2020.
