{"id":95975,"date":"2025-03-05T17:43:43","date_gmt":"2025-03-05T17:43:43","guid":{"rendered":"https:\/\/www.africa-press.net\/cotedivoire\/politique\/des-oeufs-fossiles-de-plusieurs-especes-decouverts-regroupes-sur-un-meme-site"},"modified":"2025-03-05T17:43:43","modified_gmt":"2025-03-05T17:43:43","slug":"des-oeufs-fossiles-de-plusieurs-especes-decouverts-regroupes-sur-un-meme-site","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/cotedivoire\/toutes-les-actualites\/des-oeufs-fossiles-de-plusieurs-especes-decouverts-regroupes-sur-un-meme-site","title":{"rendered":"Des \u0153ufs fossiles de plusieurs esp\u00e8ces d\u00e9couverts regroup\u00e9s sur un m\u00eame site"},"content":{"rendered":"

Africa-Press – C\u00f4te d’Ivoire. <\/strong><\/span>Les premie\u0300res coquilles fossiles du Mussentuchit Member, une formation ge\u0301ologique du Cre\u0301tace\u0301 date\u0301e de 99 millions d’anne\u0301es, situe\u0301e dans l’Utah, ont e\u0301te\u0301 de\u0301crites il y a plus de cinquante ans. Jusqu’a\u0300 re\u0301cemment, les pale\u0301ontologues e\u0301taient convaincus que cette unite\u0301 ne renfermait qu’un seul ootaxon (le nom des \u0153ufs fossilise\u0301s), Macroelongatoolithus carlylei, attribue\u0301 a\u0300 des oviraptorosaures, des dinosaures a\u0300 plumes proches des oiseaux.<\/p>\n

Mais une nouvelle e\u0301tude publie\u0301e dans Plos One raconte une toute autre histoire de ce site. En examinant plus de 4000 fragments de coquilles collecte\u0301s sur vingt sites, une e\u0301quipe du Muse\u0301e d’histoire naturelle de Caroline du Nord a identifie\u0301 six sortes d’\u0153ufs diffe\u0301rents. Parmi eux, trois appartiennent a\u0300 la famille des Elongatoolithidae, associe\u0301e aux oviraptorosaures, ce qui sugge\u0300re la coexistence d’au moins trois espe\u0300ces de ces dinosaures au me\u0302me endroit.<\/p>\n

Deux autres sortes de coquilles sont lie\u0301es aux ornithopodes, un groupe de dinosaures herbivores. Mais la de\u0301couverte la plus surprenante est celle de Mycomorphoolithus kohringi, un ootaxon jusqu’ici connu uniquement en Espagne et au Royaume-Uni et qui serait attribuable a\u0300 un crocodilomorphe.<\/p>\n


\nDes questions a\u0300 re\u0301soudre<\/b><\/p>\n

Cette pre\u0301sence transcontinentale indique soit que des e\u0301changes de faune entre l’Ame\u0301rique du Nord et l’Eurasie ont eu lieu durant le Cre\u0301tace\u0301, soit que des espe\u0300ces diffe\u0301rentes ont pondu des \u0153ufs morphologiquement tre\u0300s proches en raison d’une convergence e\u0301volutive.<\/p>\n

Cette diversite\u0301 d’\u0153ufs fossiles permet aussi de mieux comprendre l’environnement dans lequel vivait toutes ces espe\u0300ces. Il y a 99 millions d’anne\u0301es, la re\u0301gion e\u0301tait une plaine co\u0302tie\u0300re humide, situe\u0301e a\u0300 la frontie\u0300re occidentale de la mer inte\u0301rieure qui divisait l\u2019Ame\u0301rique du Nord en deux masses continentales distinctes, la Laramidie sur laquelle re\u0301gnera quelques millions d’anne\u0301es plus tard le T.rex, et l’Appalachie.<\/p>\n

La coexistence de plusieurs oviraptorosaures sugge\u0300re une partition des niches e\u0301cologiques, avec peut-e\u0302tre des diffe\u0301rences dans les re\u0301gimes alimentaires ou les habitats de nidification. Plusieurs fouilles actuellement en cours devraient permettre d’en savoir plus sur les occupants de ces lieux.<\/p>\n

Pour plus d’informations et d’analyses sur la C\u00f4te d’Ivoire<\/span>, suivez Africa-Press<\/span><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"

Africa-Press – C\u00f4te d’Ivoire. Les premie\u0300res coquilles fossiles du Mussentuchit Member, une formation ge\u0301ologique du Cre\u0301tace\u0301 date\u0301e de 99 millions d’anne\u0301es, situe\u0301e dans l’Utah, ont e\u0301te\u0301 de\u0301crites il y a plus de cinquante ans. Jusqu’a\u0300 re\u0301cemment, les pale\u0301ontologues e\u0301taient convaincus que cette unite\u0301 ne renfermait qu’un seul ootaxon (le nom des \u0153ufs fossilise\u0301s), Macroelongatoolithus carlylei, […]<\/p>\n","protected":false},"author":82,"featured_media":95974,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[37],"class_list":["post-95975","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-cote-divoire-2"],"yoast_head":"\nDes \u0153ufs fossiles de plusieurs esp\u00e8ces d\u00e9couverts regroup\u00e9s sur un m\u00eame site - C\u00f4te d'Ivoire<\/title>\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\/politique\/des-oeufs-fossiles-de-plusieurs-especes-decouverts-regroupes-sur-un-meme-site\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Des \u0153ufs fossiles de plusieurs esp\u00e8ces d\u00e9couverts regroup\u00e9s sur un m\u00eame site\" \/>\n<meta property=\"og:description\" content=\"Africa-Press – C\u00f4te d’Ivoire. Les premie\u0300res coquilles fossiles du Mussentuchit Member, une formation ge\u0301ologique du Cre\u0301tace\u0301 date\u0301e de 99 millions d’anne\u0301es, situe\u0301e dans l’Utah, ont e\u0301te\u0301 de\u0301crites il y a plus de cinquante ans. Jusqu’a\u0300 re\u0301cemment, les pale\u0301ontologues e\u0301taient convaincus que cette unite\u0301 ne renfermait qu’un seul ootaxon (le nom des \u0153ufs fossilise\u0301s), Macroelongatoolithus carlylei, […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.africa-press.net\/cotedivoire\/politique\/des-oeufs-fossiles-de-plusieurs-especes-decouverts-regroupes-sur-un-meme-site\" \/>\n<meta property=\"og:site_name\" content=\"C\u00f4te d'Ivoire\" \/>\n<meta property=\"article:published_time\" content=\"2025-03-05T17:43:43+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/static.africa-press.net\/cote\/sites\/43\/2025\/03\/sm_1741189101.313893.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"453\" \/>\n\t<meta property=\"og:image:height\" content=\"604\" \/>\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=\"2 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\/politique\/des-oeufs-fossiles-de-plusieurs-especes-decouverts-regroupes-sur-un-meme-site#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.africa-press.net\/cotedivoire\/politique\/des-oeufs-fossiles-de-plusieurs-especes-decouverts-regroupes-sur-un-meme-site\"},\"author\":{\"name\":\"cfeditorfr\",\"@id\":\"https:\/\/www.africa-press.net\/cotedivoire\/#\/schema\/person\/2b1cf3cd81a31e3cd26889ca66d677f1\"},\"headline\":\"Des \u0153ufs fossiles de plusieurs esp\u00e8ces d\u00e9couverts regroup\u00e9s sur un m\u00eame site\",\"datePublished\":\"2025-03-05T17:43:43+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.africa-press.net\/cotedivoire\/politique\/des-oeufs-fossiles-de-plusieurs-especes-decouverts-regroupes-sur-un-meme-site\"},\"wordCount\":423,\"commentCount\":0,\"image\":{\"@id\":\"https:\/\/www.africa-press.net\/cotedivoire\/politique\/des-oeufs-fossiles-de-plusieurs-especes-decouverts-regroupes-sur-un-meme-site#primaryimage\"},\"thumbnailUrl\":\"https:\/\/static.africa-press.net\/cote\/sites\/43\/2025\/03\/sm_1741189104.334322.jpg\",\"keywords\":[\"C\u00f4te d'Ivoire\"],\"articleSection\":[\"Divers\",\"Toutes les actualit\u00e9s\"],\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.africa-press.net\/cotedivoire\/politique\/des-oeufs-fossiles-de-plusieurs-especes-decouverts-regroupes-sur-un-meme-site#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.africa-press.net\/cotedivoire\/politique\/des-oeufs-fossiles-de-plusieurs-especes-decouverts-regroupes-sur-un-meme-site\",\"url\":\"https:\/\/www.africa-press.net\/cotedivoire\/politique\/des-oeufs-fossiles-de-plusieurs-especes-decouverts-regroupes-sur-un-meme-site\",\"name\":\"Des \u0153ufs fossiles de plusieurs esp\u00e8ces d\u00e9couverts regroup\u00e9s sur un m\u00eame site - 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