{"id":15967,"date":"2023-07-28T18:07:53","date_gmt":"2023-07-28T18:07:53","guid":{"rendered":"https:\/\/www.africa-press.net\/djibouti\/politique\/un-archosaure-a-armure-vivait-a-madagascar-il-y-a-240-millions-dannees"},"modified":"2023-07-28T18:28:22","modified_gmt":"2023-07-28T18:28:22","slug":"un-archosaure-a-armure-vivait-a-madagascar-il-y-a-240-millions-dannees","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/djibouti\/toutes-les-actualites\/un-archosaure-a-armure-vivait-a-madagascar-il-y-a-240-millions-dannees","title":{"rendered":"Un archosaure \u00e0 armure vivait \u00e0 Madagascar il y a 240 millions d&rsquo;ann\u00e9es"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; Djibouti. <\/strong><\/span>Les archosaures constituent un groupe de reptiles divise\u0301 en deux ligne\u0301es principales : celles des dinosaures et des pte\u0301rosaures et celles des crocodiliens. Les premiers spe\u0301cimens de ce groupe vivaient au de\u0301but du Trias, il y a environ 240 millions d&rsquo;anne\u0301es, juste avant que les dinosaures ne pointent le bout de leurs dents et assoient leur re\u0300gne sur la terre ferme.<\/p>\n<p><b>Un premier animal a\u0300 armure<\/b><\/p>\n<p>Le fossile e\u0301tudie\u0301 dans cette e\u0301tude, publie\u0301e dans la revue Zoological Journal of the Linnean Society, a e\u0301te\u0301 de\u0301couvert en 1997 a\u0300 Madagascar et il est date\u0301 de 235 millions d&rsquo;anne\u0301es. Il a e\u0301te\u0301 re\u0301cemment e\u0301tudie\u0301 par Sterling Nesbitt du Muse\u0301e ame\u0301ricain d&rsquo;histoire naturelle. Les restes retrouve\u0301s, une partie du squelette post-cra\u0302nien, correspondent a\u0300 un animal a\u0300 queue qui e\u0301voluait sur quatre pattes et qui mesurait environ 1,5 a\u0300 2 me\u0300tres de long pour 10 a\u0300 20 kilos. Mais sa caracte\u0301ristique de\u0301tonante est la pre\u0301sence d&rsquo;oste\u0301odermes sur sa colonne verte\u0301brale, c&rsquo;est-a\u0300-dire de plaques osseuses.<\/p>\n<p><b> \u00ab\u00a0Un trait boomerang\u00a0\u00bb<\/b><\/p>\n<p>Les plaques osseuses sont fre\u0301quentes chez les crocodiliens mais elles sont bien plus rares dans la ligne\u0301e des ornithodires a\u0300 l&rsquo;exception des dinosaures a\u0300 armures tels que les ste\u0301gosaures, certains titanosaures ou les ankylosaures. La pre\u0301sence de cet attribut chez le groupe couronne des dinosaures et des pte\u0301rosaures sugge\u0300re que tous les deux disposaient de l&rsquo;e\u0301quipement ge\u0301ne\u0301tique pour former des armures mais que des contraintes environnementales les ont conduits a\u0300 abandonner cette strate\u0301gie pour la rede\u0301couvrir bien plus tard : il s&rsquo;agit d&rsquo;un \u00ab\u00a0trait boomerang\u00a0\u00bb comme l&rsquo;e\u0301crivent les auteurs dans un communique\u0301. La perte du blindage osseux a sans doute favorise\u0301 le gain de poids et de taille ainsi que la diversite\u0301 de formes des premiers dinosaures.<\/p>\n<p><strong>Pour plus d&rsquo;informations et d&rsquo;analyses sur la <a href=\"https:\/\/www.africa-press.net\/djibouti\">Djibouti<\/a>, suivez <a href=\"https:\/\/www.africa-press.net\/\">Africa-Press<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; Djibouti. Les archosaures constituent un groupe de reptiles divise\u0301 en deux ligne\u0301es principales : celles des dinosaures et des pte\u0301rosaures et celles des crocodiliens. Les premiers spe\u0301cimens de ce groupe vivaient au de\u0301but du Trias, il y a environ 240 millions d&rsquo;anne\u0301es, juste avant que les dinosaures ne pointent le bout de leurs [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":15966,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[36,49,50],"class_list":["post-15967","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-africa-press","tag-africa-press-djibouti","tag-djibouti"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.1 (Yoast SEO v27.0) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Un archosaure \u00e0 armure vivait \u00e0 Madagascar il y a 240 millions d&#039;ann\u00e9es - Djibouti<\/title>\n<meta name=\"description\" content=\"Les archosaures constituent un 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