{"id":68166,"date":"2025-05-18T12:10:00","date_gmt":"2025-05-18T12:10:00","guid":{"rendered":"https:\/\/www.africa-press.net\/senegal\/politique\/decouverte-dempreintes-de-reptiles-revise-chronologie"},"modified":"2025-05-18T21:48:19","modified_gmt":"2025-05-18T21:48:19","slug":"decouverte-dempreintes-de-reptiles-revise-chronologie","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/decouverte-dempreintes-de-reptiles-revise-chronologie","title":{"rendered":"D\u00e9couverte D’Empreintes de Reptiles R\u00e9vise Chronologie"},"content":{"rendered":"

Africa-Press – Senegal. <\/strong><\/span>Une dalle de gre\u0300s retrouve\u0301e en Australie conserve les plus anciennes empreintes de griffes jamais de\u0301couvertes pour un te\u0301trapode terrestre. Ces traces, d\u2019une pre\u0301cision remarquable, appartiennent a\u0300 un amniote primitif, groupe comprenant les reptiles, les oiseaux et les mammife\u0300res. Mais ces empreintes de\u0301couvertes dans la formation Snowy Plains, au sud-est de l\u2019Australie, date\u0301es pre\u0301cise\u0301ment a\u0300 356 millions d\u2019anne\u0301es, bouleversent totalement cette chronologie.<\/p>\n

Des traces qui interrogent<\/b><\/p>\n

\u00ab Il ne fait aucun doute qu\u2019il s\u2019agit bien de griffes typiques des premiers reptiles, ce qui repousse leur apparition d\u2019au moins 35 millions d\u2019anne\u0301es \u00bb, souligne Per Ahlberg, principal auteur d\u2019une e\u0301tude qui est publie\u0301e sur ce sujet dans la revue Nature. Jusqu\u2019ici, la date commune\u0301ment admise pour l\u2019apparition des premiers amniotes se situait autour de 320 millions d\u2019anne\u0301es, a\u0300 la fin du Carbonife\u0300re (-358 a\u0300 -298 millions d\u2019anne\u0301es). Elles obligent de\u0301sormais a\u0300 envisager une e\u0301mergence bien plus pre\u0301coce des amniotes, au De\u0301vonien (\u2212419 a\u0300 \u2212359 millions d\u2019anne\u0301es) et une diversification beaucoup plus rapide des verte\u0301bre\u0301s terrestres qu\u2019on ne le pensait auparavant.<\/p>\n

Les empreintes australiennes se caracte\u0301risent par une morphologie tre\u0300s spe\u0301cifique: cinq doigts nettement se\u0301pare\u0301s se terminant par des griffes incurve\u0301es vers l\u2019inte\u0301rieur formant une sorte de \u00ab J \u00bb imprime\u0301 dans la roche. \u00ab Ces griffes ne laissent aucun doute: elles se comportent exactement comme celles de reptiles connus a\u0300 des pe\u0301riodes bien plus re\u0301centes, tels que Notalacerta ou Varanopus \u00bb, explique le pale\u0301ontologue. Cette configuration est propre aux amniotes, alors que d\u2019autres te\u0301trapodes primitifs ne montrent pas ces caracte\u0301ristiques.<\/p>\n

Si cette interpre\u0301tation est correcte, elle repousse l\u2019origine des reptiles, et donc des amniotes dans leur ensemble, de 35 millions d\u2019anne\u0301es au de\u0301but du Carbonife\u0300re. De nouvelles empreintes fossiles de reptiles en Pologne, e\u0301galement pre\u0301sente\u0301es dans l\u2019e\u0301tude, apportent un argument supple\u0301mentaire a\u0300 cette hypothe\u0300se. Elles sont moins anciennes que celles d\u2019Australie, mais aussi nettement plus anciennes que les enregistrements pre\u0301ce\u0301dents.<\/p>\n

Une sortie des eaux plus rapide qu\u2019imagine\u0301<\/b><\/p>\n

Le recalibrage de la chronologie e\u0301volutive sugge\u0301re\u0301 par cette de\u0301couverte est loin d\u2019e\u0302tre anodin. Il implique une re\u0301duction significative de la fene\u0302tre temporelle pendant laquelle la transition aquatique-terrestre aurait eu lieu. Au lieu d\u2019un processus lent e\u0301tale\u0301 sur plus de 80 millions d\u2019anne\u0301es, cette transition pourrait avoir e\u0301te\u0301 plus rapide, condense\u0301e en environ 50 millions d\u2019anne\u0301es seulement. \u00ab Cela signifie e\u0301galement que le registre fossile du De\u0301vonien est bien plus incomplet que ce qu\u2019on imaginait jusque-la\u0300. Des groupes avance\u0301s devaient de\u0301ja\u0300 e\u0302tre pre\u0301sents durant cette pe\u0301riode mais restent encore a\u0300 de\u0301couvrir \u00bb, pre\u0301cise Per Ahlberg.<\/p>\n

Par ailleurs, l\u2019hypothe\u0300se selon laquelle l\u2019extinction massive de Hangenberg, a\u0300 la fin du De\u0301vonien, aurait e\u0301te\u0301 un e\u0301ve\u0301nement de\u0301clencheur de la diversification des te\u0301trapodes modernes semble de\u0301sormais caduque. Elle aurait pluto\u0302t agi comme un filtre se\u0301lectif, e\u0301liminant des ligne\u0301es anciennes au profit de groupes de\u0301ja\u0300 e\u0301tablis mais non encore documente\u0301s.<\/p>\n

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

Africa-Press – Senegal. Une dalle de gre\u0300s retrouve\u0301e en Australie conserve les plus anciennes empreintes de griffes jamais de\u0301couvertes pour un te\u0301trapode terrestre. Ces traces, d\u2019une pre\u0301cision remarquable, appartiennent a\u0300 un amniote primitif, groupe comprenant les reptiles, les oiseaux et les mammife\u0300res. Mais ces empreintes de\u0301couvertes dans la formation Snowy Plains, au sud-est de l\u2019Australie, […]<\/p>\n","protected":false},"author":82,"featured_media":68165,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[44],"class_list":["post-68166","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-senegal-2"],"yoast_head":"\nD\u00e9couverte D'Empreintes de Reptiles R\u00e9vise Chronologie - Senegal<\/title>\n<meta name=\"description\" content=\"Une dalle de gre\u0300s retrouve\u0301e en Australie conserve les plus anciennes empreintes de griffes jamais de\u0301couvertes pour un ...\" \/>\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\/senegal\/toutes-les-actualites\/decouverte-dempreintes-de-reptiles-revise-chronologie\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"D\u00e9couverte D'Empreintes de Reptiles R\u00e9vise Chronologie\" \/>\n<meta property=\"og:description\" content=\"Une dalle de gre\u0300s retrouve\u0301e en Australie conserve les plus anciennes empreintes de griffes jamais de\u0301couvertes pour un ...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/decouverte-dempreintes-de-reptiles-revise-chronologie\" \/>\n<meta property=\"og:site_name\" content=\"Senegal\" \/>\n<meta property=\"article:published_time\" content=\"2025-05-18T12:10:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-05-18T21:48:19+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/static.africa-press.net\/senegal\/sites\/13\/2025\/05\/sm_1747633393.69613.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=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/decouverte-dempreintes-de-reptiles-revise-chronologie#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/decouverte-dempreintes-de-reptiles-revise-chronologie\"},\"author\":{\"name\":\"cfeditorfr\",\"@id\":\"https:\/\/www.africa-press.net\/senegal\/#\/schema\/person\/2b1cf3cd81a31e3cd26889ca66d677f1\"},\"headline\":\"D\u00e9couverte D’Empreintes de Reptiles R\u00e9vise Chronologie\",\"datePublished\":\"2025-05-18T12:10:00+00:00\",\"dateModified\":\"2025-05-18T21:48:19+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/decouverte-dempreintes-de-reptiles-revise-chronologie\"},\"wordCount\":581,\"commentCount\":0,\"image\":{\"@id\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/decouverte-dempreintes-de-reptiles-revise-chronologie#primaryimage\"},\"thumbnailUrl\":\"https:\/\/static.africa-press.net\/senegal\/sites\/13\/2025\/05\/sm_1747633393.69613.jpg\",\"keywords\":[\"Senegal\"],\"articleSection\":[\"Divers\",\"Toutes les actualit\u00e9s\"],\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/decouverte-dempreintes-de-reptiles-revise-chronologie#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/decouverte-dempreintes-de-reptiles-revise-chronologie\",\"url\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/decouverte-dempreintes-de-reptiles-revise-chronologie\",\"name\":\"D\u00e9couverte D'Empreintes de Reptiles R\u00e9vise Chronologie - Senegal\",\"isPartOf\":{\"@id\":\"https:\/\/www.africa-press.net\/senegal\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/decouverte-dempreintes-de-reptiles-revise-chronologie#primaryimage\"},\"image\":{\"@id\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/decouverte-dempreintes-de-reptiles-revise-chronologie#primaryimage\"},\"thumbnailUrl\":\"https:\/\/static.africa-press.net\/senegal\/sites\/13\/2025\/05\/sm_1747633393.69613.jpg\",\"datePublished\":\"2025-05-18T12:10:00+00:00\",\"dateModified\":\"2025-05-18T21:48:19+00:00\",\"author\":{\"@id\":\"https:\/\/www.africa-press.net\/senegal\/#\/schema\/person\/2b1cf3cd81a31e3cd26889ca66d677f1\"},\"description\":\"Une dalle de gre\u0300s retrouve\u0301e en Australie conserve les plus anciennes empreintes de griffes jamais de\u0301couvertes pour un ...\",\"breadcrumb\":{\"@id\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/decouverte-dempreintes-de-reptiles-revise-chronologie#breadcrumb\"},\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/decouverte-dempreintes-de-reptiles-revise-chronologie\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"fr-FR\",\"@id\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/decouverte-dempreintes-de-reptiles-revise-chronologie#primaryimage\",\"url\":\"https:\/\/static.africa-press.net\/senegal\/sites\/13\/2025\/05\/sm_1747633393.69613.jpg\",\"contentUrl\":\"https:\/\/static.africa-press.net\/senegal\/sites\/13\/2025\/05\/sm_1747633393.69613.jpg\",\"width\":1200,\"height\":899,\"caption\":\"D\u00e9couverte D'Empreintes de Reptiles R\u00e9vise Chronologie\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/decouverte-dempreintes-de-reptiles-revise-chronologie#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Accueil\",\"item\":\"https:\/\/www.africa-press.net\/senegal\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"D\u00e9couverte D’Empreintes de Reptiles R\u00e9vise Chronologie\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.africa-press.net\/senegal\/#website\",\"url\":\"https:\/\/www.africa-press.net\/senegal\/\",\"name\":\"Africa Press | Senegal | Homepage\",\"description\":\"Just another Africa News Agency Sites site\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/www.africa-press.net\/senegal\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"fr-FR\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/www.africa-press.net\/senegal\/#\/schema\/person\/2b1cf3cd81a31e3cd26889ca66d677f1\",\"name\":\"cfeditorfr\",\"url\":\"https:\/\/www.africa-press.net\/senegal\/author\/cfeditorfr\"}]}<\/script>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"D\u00e9couverte D'Empreintes de Reptiles R\u00e9vise Chronologie - Senegal","description":"Une dalle de gre\u0300s retrouve\u0301e en Australie conserve les plus anciennes empreintes de griffes jamais de\u0301couvertes pour un ...","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/decouverte-dempreintes-de-reptiles-revise-chronologie","og_locale":"fr_FR","og_type":"article","og_title":"D\u00e9couverte D'Empreintes de Reptiles R\u00e9vise Chronologie","og_description":"Une dalle de gre\u0300s retrouve\u0301e en Australie conserve les plus anciennes empreintes de griffes jamais de\u0301couvertes pour un ...","og_url":"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/decouverte-dempreintes-de-reptiles-revise-chronologie","og_site_name":"Senegal","article_published_time":"2025-05-18T12:10:00+00:00","article_modified_time":"2025-05-18T21:48:19+00:00","og_image":[{"width":1200,"height":899,"url":"https:\/\/static.africa-press.net\/senegal\/sites\/13\/2025\/05\/sm_1747633393.69613.jpg","type":"image\/jpeg"}],"author":"cfeditorfr","twitter_card":"summary_large_image","twitter_misc":{"\u00c9crit par":"cfeditorfr","Dur\u00e9e de lecture estim\u00e9e":"3 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/decouverte-dempreintes-de-reptiles-revise-chronologie#article","isPartOf":{"@id":"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/decouverte-dempreintes-de-reptiles-revise-chronologie"},"author":{"name":"cfeditorfr","@id":"https:\/\/www.africa-press.net\/senegal\/#\/schema\/person\/2b1cf3cd81a31e3cd26889ca66d677f1"},"headline":"D\u00e9couverte D’Empreintes de Reptiles R\u00e9vise Chronologie","datePublished":"2025-05-18T12:10:00+00:00","dateModified":"2025-05-18T21:48:19+00:00","mainEntityOfPage":{"@id":"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/decouverte-dempreintes-de-reptiles-revise-chronologie"},"wordCount":581,"commentCount":0,"image":{"@id":"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/decouverte-dempreintes-de-reptiles-revise-chronologie#primaryimage"},"thumbnailUrl":"https:\/\/static.africa-press.net\/senegal\/sites\/13\/2025\/05\/sm_1747633393.69613.jpg","keywords":["Senegal"],"articleSection":["Divers","Toutes les actualit\u00e9s"],"inLanguage":"fr-FR","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/decouverte-dempreintes-de-reptiles-revise-chronologie#respond"]}]},{"@type":"WebPage","@id":"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/decouverte-dempreintes-de-reptiles-revise-chronologie","url":"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/decouverte-dempreintes-de-reptiles-revise-chronologie","name":"D\u00e9couverte D'Empreintes de Reptiles R\u00e9vise Chronologie - Senegal","isPartOf":{"@id":"https:\/\/www.africa-press.net\/senegal\/#website"},"primaryImageOfPage":{"@id":"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/decouverte-dempreintes-de-reptiles-revise-chronologie#primaryimage"},"image":{"@id":"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/decouverte-dempreintes-de-reptiles-revise-chronologie#primaryimage"},"thumbnailUrl":"https:\/\/static.africa-press.net\/senegal\/sites\/13\/2025\/05\/sm_1747633393.69613.jpg","datePublished":"2025-05-18T12:10:00+00:00","dateModified":"2025-05-18T21:48:19+00:00","author":{"@id":"https:\/\/www.africa-press.net\/senegal\/#\/schema\/person\/2b1cf3cd81a31e3cd26889ca66d677f1"},"description":"Une dalle de gre\u0300s retrouve\u0301e en Australie conserve les plus anciennes empreintes de griffes jamais de\u0301couvertes pour un ...","breadcrumb":{"@id":"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/decouverte-dempreintes-de-reptiles-revise-chronologie#breadcrumb"},"inLanguage":"fr-FR","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/decouverte-dempreintes-de-reptiles-revise-chronologie"]}]},{"@type":"ImageObject","inLanguage":"fr-FR","@id":"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/decouverte-dempreintes-de-reptiles-revise-chronologie#primaryimage","url":"https:\/\/static.africa-press.net\/senegal\/sites\/13\/2025\/05\/sm_1747633393.69613.jpg","contentUrl":"https:\/\/static.africa-press.net\/senegal\/sites\/13\/2025\/05\/sm_1747633393.69613.jpg","width":1200,"height":899,"caption":"D\u00e9couverte D'Empreintes de Reptiles R\u00e9vise Chronologie"},{"@type":"BreadcrumbList","@id":"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/decouverte-dempreintes-de-reptiles-revise-chronologie#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Accueil","item":"https:\/\/www.africa-press.net\/senegal\/"},{"@type":"ListItem","position":2,"name":"D\u00e9couverte D’Empreintes de Reptiles R\u00e9vise Chronologie"}]},{"@type":"WebSite","@id":"https:\/\/www.africa-press.net\/senegal\/#website","url":"https:\/\/www.africa-press.net\/senegal\/","name":"Africa Press | Senegal | Homepage","description":"Just another Africa News Agency Sites site","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.africa-press.net\/senegal\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"fr-FR"},{"@type":"Person","@id":"https:\/\/www.africa-press.net\/senegal\/#\/schema\/person\/2b1cf3cd81a31e3cd26889ca66d677f1","name":"cfeditorfr","url":"https:\/\/www.africa-press.net\/senegal\/author\/cfeditorfr"}]}},"_links":{"self":[{"href":"https:\/\/www.africa-press.net\/senegal\/wp-json\/wp\/v2\/posts\/68166","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.africa-press.net\/senegal\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.africa-press.net\/senegal\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.africa-press.net\/senegal\/wp-json\/wp\/v2\/users\/82"}],"replies":[{"embeddable":true,"href":"https:\/\/www.africa-press.net\/senegal\/wp-json\/wp\/v2\/comments?post=68166"}],"version-history":[{"count":0,"href":"https:\/\/www.africa-press.net\/senegal\/wp-json\/wp\/v2\/posts\/68166\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.africa-press.net\/senegal\/wp-json\/wp\/v2\/media\/68165"}],"wp:attachment":[{"href":"https:\/\/www.africa-press.net\/senegal\/wp-json\/wp\/v2\/media?parent=68166"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.africa-press.net\/senegal\/wp-json\/wp\/v2\/categories?post=68166"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.africa-press.net\/senegal\/wp-json\/wp\/v2\/tags?post=68166"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}