{"id":37633,"date":"2023-08-22T16:30:40","date_gmt":"2023-08-22T16:30:40","guid":{"rendered":"https:\/\/www.africa-press.net\/mali\/politique\/decouverte-dun-nouveau-fossile-a-la-racine-du-groupe-des-pterosaures"},"modified":"2023-08-22T17:49:07","modified_gmt":"2023-08-22T17:49:07","slug":"decouverte-dun-nouveau-fossile-a-la-racine-du-groupe-des-pterosaures","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/mali\/divers\/decouverte-dun-nouveau-fossile-a-la-racine-du-groupe-des-pterosaures","title":{"rendered":"D\u00e9couverte d\u2019un nouveau fossile \u00e0 la racine du groupe des pt\u00e9rosaures"},"content":{"rendered":"

Africa-Press – Mali. <\/strong><\/span>Tandis que les dinosaures e\u0301tablissaient leur re\u0300gne sur la terre ferme, les pte\u0301rosaures ont commence\u0301 a\u0300 conque\u0301rir le ciel a\u0300 la fin du Trias (-251 a\u0300 -200 millions d\u2019anne\u0301es). Si l\u2019essor des dinosaures est bien documente\u0301, celui des reptiles volants pose encore question : avec leurs os creux, comme ceux des oiseaux, ils laissent aujourd\u2019hui moins de traces dans le registre fossile. Toutefois, en 2020, l\u2019Argentin Martin Ezcurra a publie\u0301, dans la revue Nature, un article e\u0301clairant pour la premie\u0300re fois leurs origines. Il faut les chercher chez un groupe de reptiles de petite taille, probablement bipe\u0300des et insectivores, les lagerpe\u0301tide\u0301s qui vivaient entre -237 et -210 millions d\u2019anne\u0301es.<\/p>\n

L\u2019examen minutieux de plusieurs fossiles, dont certains re\u0301cemment de\u0301couverts, a re\u0301ve\u0301le\u0301 que ces petits animaux posse\u0301daient de nombreuses ressemblances anatomiques avec les pte\u0301rosaures, en particulier une oreille interne compose\u0301e de trois canaux semi-circulaires caracte\u0301ristique des animaux dote\u0301s d\u2019un sens de l\u2019e\u0301quilibre de\u0301veloppe\u0301 et e\u0301galement pre\u0301sente chez les oiseaux.<\/p>\n

Bec et griffes proe\u0301minentes<\/b><\/p>\n

C\u2019est un tel lagerpe\u0301tide\u0301 qui a e\u0301te\u0301 retrouve\u0301 au Bre\u0301sil, dans des couches se\u0301dimentaires date\u0301es de 230 millions d\u2019anne\u0301es. Le fossile, baptise\u0301 Venetoraptor gassenae, est constitue\u0301 d\u2019un squelette partiel bien conserve\u0301. Son analyse, qui fait aussi l\u2019objet d\u2019une publication dans la revue Nature, met en e\u0301vidence des caracte\u0301ristiques inhabituelles : un bec de rapace et des mains e\u0301largies avec des griffes en forme de cimeterre. Sans doute deux adaptations spe\u0301cifiques a\u0300 sa niche e\u0301cologique, vraisemblablement un environnement forestier.<\/p>\n

Les griffes devaient lui permettre de s\u2019agripper aux branches et ainsi de se de\u0301placer d\u2019arbre en arbre, peut-e\u0302tre en sautant mais pas en volant, ce dont il e\u0301tait incapable. Quant a\u0300 son bec, son ro\u0302le est plus flou : apparat ? re\u0301gulateur thermique ? e\u0301le\u0301ment pour l\u2019alimentation ? Les donne\u0301es ne sont pas suffisantes pour trancher.<\/p>\n


\nUn animal de taille moyenne<\/b><\/p>\n

Venetoraptor gassenae mesurait environ un me\u0300tre de long pour un poids de 6 kilos environ et une hauteur d\u2019une trentaine de centime\u0300tres. Son corps e\u0301tait recouvert de protoplumes, plus proches de filaments. Son allure ge\u0301ne\u0301rale diffe\u0300re des autres, rares, lagerpe\u0301tide\u0301s connus. Ce qui sugge\u0300re que ce groupe e\u0301tait aussi diversifie\u0301 sur le plan morphologique que les pte\u0301rosaures du Trias et me\u0302me plus diversifie\u0301 que les dinosaures de la fin de cette pe\u0301riode.<\/p>\n

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

Africa-Press – Mali. Tandis que les dinosaures e\u0301tablissaient leur re\u0300gne sur la terre ferme, les pte\u0301rosaures ont commence\u0301 a\u0300 conque\u0301rir le ciel a\u0300 la fin du Trias (-251 a\u0300 -200 millions d\u2019anne\u0301es). Si l\u2019essor des dinosaures est bien documente\u0301, celui des reptiles volants pose encore question : avec leurs os creux, comme ceux des oiseaux, […]<\/p>\n","protected":false},"author":82,"featured_media":37632,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[14,17],"tags":[76,86,19],"class_list":["post-37633","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-africa-press","tag-africa-press-mali","tag-mali"],"yoast_head":"\nD\u00e9couverte d\u2019un nouveau fossile \u00e0 la racine du groupe des pt\u00e9rosaures - Mali<\/title>\n<meta name=\"description\" content=\"Tandis que les dinosaures e\u0301tablissaient leur re\u0300gne sur la terre ferme, les pte\u0301rosaures ont commence\u0301 a\u0300 conque\u0301rir 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\/mali\/divers\/decouverte-dun-nouveau-fossile-a-la-racine-du-groupe-des-pterosaures\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"D\u00e9couverte d\u2019un nouveau fossile \u00e0 la racine du groupe des pt\u00e9rosaures\" \/>\n<meta property=\"og:description\" content=\"Tandis que les dinosaures e\u0301tablissaient leur re\u0300gne sur la terre ferme, les pte\u0301rosaures ont commence\u0301 a\u0300 conque\u0301rir le ...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.africa-press.net\/mali\/divers\/decouverte-dun-nouveau-fossile-a-la-racine-du-groupe-des-pterosaures\" \/>\n<meta property=\"og:site_name\" content=\"Mali\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/AfricaPressTunisiaa\" \/>\n<meta property=\"article:published_time\" content=\"2023-08-22T16:30:40+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-08-22T17:49:07+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/static.africa-press.net\/mali\/sites\/21\/2023\/08\/sm_1692710018.127942.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"899\" \/>\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\/mali\/divers\/decouverte-dun-nouveau-fossile-a-la-racine-du-groupe-des-pterosaures#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.africa-press.net\/mali\/divers\/decouverte-dun-nouveau-fossile-a-la-racine-du-groupe-des-pterosaures\"},\"author\":{\"name\":\"cfeditorfr\",\"@id\":\"https:\/\/www.africa-press.net\/mali\/#\/schema\/person\/2b1cf3cd81a31e3cd26889ca66d677f1\"},\"headline\":\"D\u00e9couverte d\u2019un nouveau fossile \u00e0 la racine du groupe des pt\u00e9rosaures\",\"datePublished\":\"2023-08-22T16:30:40+00:00\",\"dateModified\":\"2023-08-22T17:49:07+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.africa-press.net\/mali\/divers\/decouverte-dun-nouveau-fossile-a-la-racine-du-groupe-des-pterosaures\"},\"wordCount\":465,\"commentCount\":0,\"image\":{\"@id\":\"https:\/\/www.africa-press.net\/mali\/divers\/decouverte-dun-nouveau-fossile-a-la-racine-du-groupe-des-pterosaures#primaryimage\"},\"thumbnailUrl\":\"https:\/\/static.africa-press.net\/mali\/sites\/21\/2023\/08\/sm_1692710018.127942.jpg\",\"keywords\":[\"Africa Press\",\"Africa Press-Mali\",\"mali\"],\"articleSection\":[\"Divers\",\"Toutes les actualit\u00e9s\"],\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.africa-press.net\/mali\/divers\/decouverte-dun-nouveau-fossile-a-la-racine-du-groupe-des-pterosaures#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.africa-press.net\/mali\/divers\/decouverte-dun-nouveau-fossile-a-la-racine-du-groupe-des-pterosaures\",\"url\":\"https:\/\/www.africa-press.net\/mali\/divers\/decouverte-dun-nouveau-fossile-a-la-racine-du-groupe-des-pterosaures\",\"name\":\"D\u00e9couverte d\u2019un nouveau fossile \u00e0 la racine du groupe des pt\u00e9rosaures - 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