{"id":109845,"date":"2025-12-05T15:26:53","date_gmt":"2025-12-05T15:26:53","guid":{"rendered":"https:\/\/www.africa-press.net\/cotedivoire\/politique\/confirmation-dun-tyrannosaure-nain-par-etude-recente"},"modified":"2025-12-05T15:42:12","modified_gmt":"2025-12-05T15:42:12","slug":"confirmation-dun-tyrannosaure-nain-par-etude-recente","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/cotedivoire\/toutes-les-actualites\/confirmation-dun-tyrannosaure-nain-par-etude-recente","title":{"rendered":"Confirmation d&rsquo;un Tyrannosaure Nain par \u00c9tude R\u00e9cente"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; C\u00f4te d&rsquo;Ivoire. <\/strong><\/span>L\u2019ide\u0301e qu\u2019un petit tyrannosaure ait coexiste\u0301 avec l&rsquo;immense Tyrannosaurus rex (6 me\u0300tres de long pour 7 tonnes pour les plus gros) divise les pale\u0301ontologues depuis plus d\u2019un demi-sie\u0300cle. Certains plaident pour son existence en s&rsquo;appuyant sur quelques e\u0301tudes, insuffisamment solides toutefois pour apporter une certitude. D&rsquo;autres spe\u0301cialistes conside\u0300rent que les petits spe\u0301cimens pre\u0301sente\u0301s par les premiers sont des T.rex juve\u0301niles et non des adultes miniatures. Les deux groupes s&rsquo;invectivant re\u0301gulie\u0300rement, par me\u0301dias interpose\u0301s.<\/p>\n<p>En octobre 2025, une e\u0301tude mene\u0301e sur le ce\u0301le\u0300bre fossile des \u00ab\u00a0dinosaures en duel\u00a0\u00bb concluait, sans doute pour la premie\u0300re fois avec un haut degre\u0301 de confiance, que les Nanotyrannus lancensis existaient bien et qu&rsquo;il y avait me\u0302me une autre espe\u0300ce de T.rex naine, baptise\u0301e N. lethaeus ! L&rsquo;analyse du fossile se fondait notamment sur l&rsquo;examen des anneaux de croissance des os longs, ainsi que sur la taille des verte\u0300bres, pour conclure que le petit dinosaure pre\u0301dateur e\u0301tait a\u0302ge\u0301 d&rsquo;une vingtaine d&rsquo;anne\u0301es et qu&rsquo;il s&rsquo;agissait donc bien d&rsquo;un adulte.<\/p>\n<p><b>Un petit os de la gorge<\/b><\/p>\n<p>Cette nouvelle recherche repose sur un autre fossile: \u00ab\u00a0c&rsquo;est l&rsquo;holotype de Nanotyrannus lancensis, le spe\u0301cimen qui de\u0301finit formellement l&rsquo;espe\u0300ce\u00a0\u00bb, explique Christopher Griffin de l&rsquo;Universite\u0301 de Princeton (Etats-Unis) et principal auteur de l&rsquo;e\u0301tude publie\u0301e dans la revue Science. Il s&rsquo;agit d&rsquo;un cra\u0302ne isole\u0301 qui a e\u0301te\u0301 de\u0301couvert dans la formation de Hell Creek en 1946. Sans os longs, impossible jusqu\u2019ici d\u2019estimer son a\u0302ge par histologie, la me\u0301thode la plus fiable pour de\u0301terminer la maturite\u0301 d\u2019un dinosaure. C\u2019est pre\u0301cise\u0301ment ce verrou que ce travail de\u0301bloque aujourd&rsquo;hui en montrant qu\u2019un os appartenant au syste\u0300me hyoi\u0308dien (situe\u0301 a\u0300 la base ante\u0301rieure du cou et qui permet de soutenir les e\u0301le\u0301ments visce\u0301raux du cou) permet \u00ab\u00a0l&rsquo;e\u0301valuation qualitative de l&rsquo;a\u0302ge d&rsquo;un individu (tre\u0300s jeune, adulte ou interme\u0301diaire)\u00a0\u00bb.<\/p>\n<p>Pour e\u0301tablir la valeur de ce nouvel indicateur, les auteurs ont d\u2019abord e\u0301tudie\u0301 l&rsquo;appareil hyoi\u0308dien d\u2019espe\u0300ces actuelles, comme l\u2019autruche ou l\u2019alligator, puis de plusieurs dinosaures fossiles pour lesquels l\u2019a\u0302ge et le statut de croissance sont bien documente\u0301s. A\u0300 chaque fois, l\u2019os de la gorge enregistre des marqueurs clairs, notamment la pre\u0301sence ou l\u2019absence d\u2019un syste\u0300me fondamental externe (EFS), une structure forme\u0301e de fines lignes tre\u0300s serre\u0301es indiquant que la croissance est arrive\u0301e a\u0300 son terme. Cette signature qui, juge\u0301e fiable me\u0302me dans de petits os soumis a\u0300 un fort remodelage interne, permet alors de s\u2019attaquer au cas de Nanotyrannus.<\/p>\n<p>Les pale\u0301ontologues ont re\u0301alise\u0301 de multiples points de pre\u0301le\u0300vement le long de l&rsquo;os hyoi\u0308de et ont pu identifier a\u0300 chaque fois la pre\u0301sence de l&rsquo;EFS. \u00ab\u00a0Sa pre\u0301sence constante a\u0300 ces diffe\u0301rents points exclut l&rsquo;hypothe\u0300se d&rsquo;une de\u0301formation locale, et aucune pathologie connue ne produit une telle structure\u00a0\u00bb, explique Christopher Griffin. La structure indique bien que l\u2019individu avait atteint sa taille adulte et e\u0301carte l\u2019hypothe\u0300se d\u2019un jeune T. rex encore en pleine croissance.<\/p>\n<p><b>Un tyran miniature qui reba\u0302tit l\u2019e\u0301cologie de Hell Creek<\/b><\/p>\n<p>L&rsquo;holotype de Nanotyrannus lancensis repose donc bien sur un individu adulte et il correspond effectivement a\u0300 une espe\u0300ce naine de tyrannosaure qui vivait aux co\u0302te\u0301s de son immense pendant. Ce nouveau re\u0301sultat conforte ceux obtenus avec le fossile des dinosaures en duel car \u00ab\u00a0les deux e\u0301tudes s&rsquo;appuient sur des preuves inde\u0301pendantes et aboutissent a\u0300 des conclusions similaires\u00a0\u00bb, insiste le pale\u0301ontologue. La coexistence de deux tyrannosaures remet en question l\u2019ide\u0301e d\u2019une domination exclusive du grand T.rex sur les e\u0301cosyste\u0300mes de Hell Creek. Elle sugge\u0300re que plusieurs niches e\u0301cologiques e\u0301taient exploite\u0301es par ces deux carnivores de taille tre\u0300s diffe\u0301rentes et pourrait aussi expliquer la myste\u0301rieuse absence d&rsquo;autres pre\u0301dateurs de taille interme\u0301diaire dans le me\u0302me lieu et a\u0300 la me\u0302me e\u0301poque.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"453\" height=\"266\" class=\"alignnone wp-image-109843 size-full\" src=\"https:\/\/static.africa-press.net\/cote\/sites\/43\/2025\/12\/sm_1764936652.582536.jpg\" srcset=\"https:\/\/static.africa-press.net\/cote\/sites\/43\/2025\/12\/sm_1764936652.582536.jpg 453w, https:\/\/static.africa-press.net\/cote\/sites\/43\/2025\/12\/sm_1764936652.582536-300x176.jpg 300w\" sizes=\"auto, (max-width: 453px) 100vw, 453px\" \/><\/p>\n<p>L\u2019e\u0301tude ouvre aussi un nouvel horizon me\u0301thodologique car les cra\u0302nes isole\u0301s e\u0301taient jusqu\u2019ici exclus des analyses de maturite\u0301. Les os du syste\u0300me hyoi\u0308de offrent de\u0301sormais une solution pour examiner d\u2019autres fossiles sans ne\u0301cessiter de mate\u0301riel comple\u0301mentaire. Christopher Griffin souligne cependant que la me\u0301thode n&rsquo;est pas adapte\u0301e pour fournir une estimation pre\u0301cise de l&rsquo;a\u0302ge d&rsquo;un individu a\u0300 sa mort.<\/p>\n<p>Il semble aussi difficile de confirmer la re\u0301alite\u0301 de l&rsquo;autre espe\u0300ce naine, Nanotyrannus lethaeus qui correspondrait au fossile de Jane, avec cette me\u0301thode \u00ab\u00a0a\u0300 moins qu&rsquo;il y ait des diffe\u0301rences importantes dans leurs sche\u0301mas de croissance\u00a0\u00bb. \u00ab\u00a0Nous sommes plus optimistes quant a\u0300 l&rsquo;inte\u0301re\u0302t de cette me\u0301thode pour d&rsquo;autres espe\u0300ces et d&rsquo;autres spe\u0301cimens qui, comme l&rsquo;holotype de Nanotyrannus, posse\u0300dent un os hyoi\u0308de mais aucun fragment de membre ou de co\u0302te conserve\u0301\u00a0\u00bb, conclut le chercheur.<\/p>\n<p><strong>Pour plus d&rsquo;informations et d&rsquo;analyses sur la <span style=\"color: #ff6600\">C\u00f4te d&rsquo;Ivoire<\/span>, suivez <span style=\"color: #ff6600\">Africa-Press<\/span><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; C\u00f4te d&rsquo;Ivoire. L\u2019ide\u0301e qu\u2019un petit tyrannosaure ait coexiste\u0301 avec l&rsquo;immense Tyrannosaurus rex (6 me\u0300tres de long pour 7 tonnes pour les plus gros) divise les pale\u0301ontologues depuis plus d\u2019un demi-sie\u0300cle. Certains plaident pour son existence en s&rsquo;appuyant sur quelques e\u0301tudes, insuffisamment solides toutefois pour apporter une certitude. D&rsquo;autres spe\u0301cialistes conside\u0300rent que les petits [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":109844,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[29],"class_list":["post-109845","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-cote-divoire"],"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>Confirmation d&#039;un Tyrannosaure Nain par \u00c9tude R\u00e9cente - C\u00f4te d&#039;Ivoire<\/title>\n<meta name=\"description\" content=\"L\u2019ide\u0301e qu\u2019un petit tyrannosaure ait coexiste\u0301 avec l&#039;immense Tyrannosaurus rex (6 me\u0300tres de long pour 7 tonnes pour le ...\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.africa-press.net\/cotedivoire\/toutes-les-actualites\/confirmation-dun-tyrannosaure-nain-par-etude-recente\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Confirmation d&#039;un Tyrannosaure Nain par \u00c9tude R\u00e9cente\" \/>\n<meta property=\"og:description\" content=\"L\u2019ide\u0301e qu\u2019un petit tyrannosaure ait coexiste\u0301 avec l&#039;immense Tyrannosaurus rex (6 me\u0300tres de long pour 7 tonnes pour le ...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.africa-press.net\/cotedivoire\/toutes-les-actualites\/confirmation-dun-tyrannosaure-nain-par-etude-recente\" \/>\n<meta property=\"og:site_name\" content=\"C\u00f4te d&#039;Ivoire\" \/>\n<meta property=\"article:published_time\" content=\"2025-12-05T15:26:53+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-12-05T15:42:12+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/static.africa-press.net\/cote\/sites\/43\/2025\/12\/sm_1764936662.861458.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"900\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"cfeditorfr\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"cfeditorfr\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.africa-press.net\/cotedivoire\/toutes-les-actualites\/confirmation-dun-tyrannosaure-nain-par-etude-recente#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.africa-press.net\/cotedivoire\/toutes-les-actualites\/confirmation-dun-tyrannosaure-nain-par-etude-recente\"},\"author\":{\"name\":\"cfeditorfr\",\"@id\":\"https:\/\/www.africa-press.net\/cotedivoire\/#\/schema\/person\/2b1cf3cd81a31e3cd26889ca66d677f1\"},\"headline\":\"Confirmation d&rsquo;un Tyrannosaure Nain par \u00c9tude R\u00e9cente\",\"datePublished\":\"2025-12-05T15:26:53+00:00\",\"dateModified\":\"2025-12-05T15:42:12+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.africa-press.net\/cotedivoire\/toutes-les-actualites\/confirmation-dun-tyrannosaure-nain-par-etude-recente\"},\"wordCount\":941,\"commentCount\":0,\"image\":{\"@id\":\"https:\/\/www.africa-press.net\/cotedivoire\/toutes-les-actualites\/confirmation-dun-tyrannosaure-nain-par-etude-recente#primaryimage\"},\"thumbnailUrl\":\"https:\/\/static.africa-press.net\/cote\/sites\/43\/2025\/12\/sm_1764936662.861458.jpg\",\"keywords\":[\"C\u00d4TE D'IVOIRE\"],\"articleSection\":[\"Divers\",\"Toutes les actualit\u00e9s\"],\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.africa-press.net\/cotedivoire\/toutes-les-actualites\/confirmation-dun-tyrannosaure-nain-par-etude-recente#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.africa-press.net\/cotedivoire\/toutes-les-actualites\/confirmation-dun-tyrannosaure-nain-par-etude-recente\",\"url\":\"https:\/\/www.africa-press.net\/cotedivoire\/toutes-les-actualites\/confirmation-dun-tyrannosaure-nain-par-etude-recente\",\"name\":\"Confirmation d'un Tyrannosaure Nain par \u00c9tude R\u00e9cente - 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