{"id":4102,"date":"2022-01-01T17:33:25","date_gmt":"2022-01-01T16:33:25","guid":{"rendered":"https:\/\/deepseareporter.dev.phosdev.se\/?p=4102"},"modified":"2022-11-17T17:52:02","modified_gmt":"2022-11-17T16:52:02","slug":"forhistorisk-havsjatte-upptackt-i-usa","status":"publish","type":"post","link":"https:\/\/deepseareporter.dev.phosdev.se\/sv\/forhistorisk-havsjatte-upptackt-i-usa\/","title":{"rendered":"F\u00f6rhistorisk havsj\u00e4tte uppt\u00e4ckt i USA"},"content":{"rendered":"\n<p><strong>Fossilet av en gigantisk havsreptil med en skalle stor som en flygel har uppt\u00e4ckts i Nevada i v\u00e4stra USA. Det mest anm\u00e4rkningsv\u00e4rda med fyndet \u00e4r dess \u00e5lder, 246 miljoner \u00e5r. Mycket stora djur existerade inte f\u00f6re den tiden, vilket inneb\u00e4r att besten, s\u00e5vitt k\u00e4nt, var det f\u00f6rsta j\u00e4ttedjuret p\u00e5 jorden.<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/deepseareporter.dev.phosdev.se\/wp-content\/uploads\/2022\/01\/211230-havsreptil-4ea0f03f-a001nh-1.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"700\" height=\"392\" src=\"https:\/\/deepseareporter.dev.phosdev.se\/wp-content\/uploads\/2022\/01\/211230-havsreptil-4ea0f03f-a001nh-1.jpg\" alt=\"fossil skalle cymbospondylus youngorum\" class=\"wp-image-4112\"\/><\/a><figcaption class=\"wp-element-caption\">Den fossila skallen av Cymbospondylus youngorum, en utd\u00f6d ichthyosaurie fr\u00e5n triasperioden. Skallen \u00e4r lika stor som en stor flygel.  Foto: Martin Sander, Natural History Museum of Los Angeles County<\/figcaption><\/figure>\n\n\n\n<p>Den nya arten, som har d\u00f6pts till Cymbospondylus youngorum, tillh\u00f6rde ichthyosaurierna, fisk\u00f6dlorna, en grupp reptiler som dominerade v\u00e4rldshaven under dinosauriernas tid. Deras ursprung \u00e4r h\u00f6ljt i dunkel, men de hade definitivt ingen n\u00e4rmare sl\u00e4ktskap med dinosaurierna (som aldrig utvecklade n\u00e5gra marina, eller ens s\u00f6tvattenlevande, arter).<\/p>\n\n\n\n<p>Ichthyosaurierna d\u00f6k upp utan f\u00f6rvarning f\u00f6r cirka 249 miljoner \u00e5r sedan, alldeles i b\u00f6rjan av triasperioden, strax efter den st\u00f6rsta katastrof som livet p\u00e5 jorden genomlidit; massutd\u00f6endet i slutet av permperioden f\u00f6r 252 miljoner \u00e5r sedan. Cirka 90 procent av jordens arter utpl\u00e5nades och ekosystemen p\u00e5 planeten omstrukturerades fullst\u00e4ndigt.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/deepseareporter.dev.phosdev.se\/wp-content\/uploads\/2022\/01\/211230-havsreptil-4ea0f03f-a002nh.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"700\" height=\"347\" src=\"https:\/\/deepseareporter.dev.phosdev.se\/wp-content\/uploads\/2022\/01\/211230-havsreptil-4ea0f03f-a002nh.jpg\" alt=\"skalle havsreptile\" class=\"wp-image-4113\"\/><\/a><figcaption class=\"wp-element-caption\">Skallen av den nyuppt\u00e4ckta havsreptilen. Tandbev\u00e4pningen visar att den var ett h\u00f6gaktivt rovdjur som sannolikt dominerade ekosystemet i haven f\u00f6r 246 miljoner \u00e5r sedan.  Foto: Natalja Kent, Natural History Museum of Los Angeles County.<\/figcaption><\/figure>\n\n\n\n<p><strong>Rekordsnabb tillv\u00e4xt<\/strong><\/p>\n\n\n\n<p>Kanske ichthyosauriernas anf\u00e4der gynnades av katastrofen. Hur som helst, att d\u00f6ma av de fossila vittnesb\u00f6rden blev de mycket snabbt havens viktigaste rovdjur &#8211; och den nyuppt\u00e4ckta arten avsl\u00f6jar att de p\u00e5 rekordtid, inom loppet av bara tre miljoner \u00e5r, uppn\u00e5dde enorm kroppstorlek. Cymbospondylus youngorum blev 15-17 meter l\u00e5ng. Det enorma huvudet var cirka tv\u00e5 meter l\u00e5ngt, stort som ett stort piano, med k\u00e4kar f\u00f6rsedda med rader av stora, spetsiga t\u00e4nder.<\/p>\n\n\n\n<p>Detta \u00e4r m\u00e4rkligt. P\u00e5 torra land dr\u00f6jde det mycket l\u00e5ng tid, ytterligare 40 miljoner \u00e5r, innan de f\u00f6rsta gigantiska dinosaurierna d\u00f6k upp p\u00e5 scenen. Och l\u00e5ngt senare i jordens historia, d\u00e5 d\u00e4ggdjuren tagit \u00f6ver huvudrollerna, dr\u00f6jde det 45 miljoner \u00e5r innan valarna utvecklade j\u00e4ttelika former. S\u00e5 varf\u00f6r gick det s\u00e5 snabbt f\u00f6r ichthyosaurierna? Och vad var orsaken till den pl\u00f6tsliga tillv\u00e4xten?<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/deepseareporter.dev.phosdev.se\/wp-content\/uploads\/2022\/01\/211230-havsreptil-4ea0f03f-a003nh.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"541\" height=\"700\" src=\"https:\/\/deepseareporter.dev.phosdev.se\/wp-content\/uploads\/2022\/01\/211230-havsreptil-4ea0f03f-a003nh.jpg\" alt=\"rekonstruktion av den nyuppt\u00e4ckta havsreptilen\" class=\"wp-image-4111\"\/><\/a><figcaption class=\"wp-element-caption\">Rekonstruktion av den nyuppt\u00e4ckta havsreptilen. Dess l\u00e4ngd var 15-17 meter och skallen n\u00e5dde en l\u00e4ngd p\u00e5 tv\u00e5 meter. P\u00e5 bilden syns dess sannolika bytesdjur, ammoniter, skalf\u00f6rsedda bl\u00e4ckfiskar, samt konodonter, en typ av k\u00e4kl\u00f6sa fiskar.  Grafik: Stephanie Abramowicz, Natural History Museum of Los Angeles County<\/figcaption><\/figure>\n\n\n\n<p><strong>M\u00e5nga bytesdjur<\/strong><\/p>\n\n\n\n<p>Svaret kan vara uppkomsten av en rik fauna av potentiella bytesdjur, i f\u00f6rsta hand s\u00e5 kallade ammoniter, en utd\u00f6d grupp av skalf\u00f6rsedda bl\u00e4ckfiskar, och konodonter, en likaledes utd\u00f6d grupp av k\u00e4kl\u00f6sa fiskar. Ichthyosauriens k\u00e4kar och t\u00e4nder var perfekt anpassade f\u00f6r att livn\u00e4ra sig p\u00e5 den typen av byten.<\/p>\n\n\n\n<p>En annan orsak kan vara att ichthyosaurierna saknade konkurrens under en l\u00e4ngre tid. Forskarna, vars r\u00f6n publiceras i tidskriften Science, har gjort ber\u00e4kningar som visar att n\u00e4ringskedjan i haven i b\u00f6rjan av trias mycket v\u00e4l kunde h\u00e4rb\u00e4rgera rovdjur av monsterstorlek.<\/p>\n\n\n\n<p>L\u00e4mningarna efter Cymbospondylus gr\u00e4vdes fram ur sediment\u00e4ra lager i Augusta Mountains i centrala Nevada. De har nu st\u00e4llts ut p\u00e5 Natural History Museum i Los Angeles, Kalifornien.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Fossilet av en gigantisk havsreptil med en skalle stor som en flygel har uppt\u00e4ckts i Nevada. Fyndet \u00e4r 246 miljoner \u00e5r gammalt, vilket s\u00e5vitt vi vet det g\u00f6r varelsen till det f\u00f6rsta j\u00e4ttedjuret p\u00e5 v\u00e5r planet<\/p>\n","protected":false},"author":3,"featured_media":4111,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[580],"tags":[394,395,850],"class_list":["post-4102","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-internationellt","tag-fiskodlor","tag-havsreptiler","tag-usa"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.0 (Yoast SEO v27.0) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>F\u00f6rhistorisk havsj\u00e4tte uppt\u00e4ckt i USA - Deep Sea Reporter<\/title>\n<meta name=\"description\" content=\"Fossilet av en gigantisk havsreptil med en skalle stor som en flygel har uppt\u00e4ckts i Nevada. Fyndet \u00e4r 246 miljoner \u00e5r gammalt, vilket s\u00e5vitt vi vet det g\u00f6r varelsen till det f\u00f6rsta j\u00e4ttedjuret p\u00e5 v\u00e5r planet.\" \/>\n<meta name=\"robots\" content=\"noindex, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<meta property=\"og:locale\" content=\"sv_SE\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"F\u00f6rhistorisk havsj\u00e4tte uppt\u00e4ckt i USA\" \/>\n<meta property=\"og:description\" content=\"Fossilet av en gigantisk havsreptil med en skalle stor som en flygel har uppt\u00e4ckts i Nevada. Fyndet \u00e4r 246 miljoner \u00e5r gammalt, vilket s\u00e5vitt vi vet det g\u00f6r varelsen till det f\u00f6rsta j\u00e4ttedjuret p\u00e5 v\u00e5r planet.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/deepseareporter.dev.phosdev.se\/sv\/forhistorisk-havsjatte-upptackt-i-usa\/\" \/>\n<meta property=\"og:site_name\" content=\"Deep Sea Reporter\" \/>\n<meta property=\"article:published_time\" content=\"2022-01-01T16:33:25+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2022-11-17T16:52:02+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/deepseareporter.dev.phosdev.se\/wp-content\/uploads\/2022\/01\/211230-havsreptil-4ea0f03f-a001nh-1.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"700\" \/>\n\t<meta property=\"og:image:height\" content=\"392\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Apollonia\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:title\" content=\"F\u00f6rhistorisk havsj\u00e4tte uppt\u00e4ckt i USA\" \/>\n<meta name=\"twitter:description\" content=\"Fossilet av en gigantisk havsreptil med en skalle stor som en flygel har uppt\u00e4ckts i Nevada. 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Fyndet \u00e4r 246 miljoner \u00e5r gammalt, vilket s\u00e5vitt vi vet det g\u00f6r varelsen till det f\u00f6rsta j\u00e4ttedjuret p\u00e5 v\u00e5r planet.","breadcrumb":{"@id":"https:\/\/deepseareporter.dev.phosdev.se\/sv\/forhistorisk-havsjatte-upptackt-i-usa\/#breadcrumb"},"inLanguage":"sv-SE","potentialAction":[{"@type":"ReadAction","target":["https:\/\/deepseareporter.dev.phosdev.se\/sv\/forhistorisk-havsjatte-upptackt-i-usa\/"]}]},{"@type":"ImageObject","inLanguage":"sv-SE","@id":"https:\/\/deepseareporter.dev.phosdev.se\/sv\/forhistorisk-havsjatte-upptackt-i-usa\/#primaryimage","url":"https:\/\/deepseareporter.dev.phosdev.se\/wp-content\/uploads\/2022\/01\/211230-havsreptil-4ea0f03f-a003nh.jpg","contentUrl":"https:\/\/deepseareporter.dev.phosdev.se\/wp-content\/uploads\/2022\/01\/211230-havsreptil-4ea0f03f-a003nh.jpg","width":541,"height":700,"caption":"Rekonstruktion av den nyuppt\u00e4ckta havsreptilen. Dess l\u00e4ngd var 15-17 meter och skallen n\u00e5dde en l\u00e4ngd p\u00e5 tv\u00e5 meter. P\u00e5 bilden syns dess sannolika bytesdjur, ammoniter, skalf\u00f6rsedda bl\u00e4ckfiskar, samt konodonter, en typ av k\u00e4kl\u00f6sa fiskar. 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