{"id":70617,"date":"2025-08-17T12:00:00","date_gmt":"2025-08-17T12:00:00","guid":{"rendered":"https:\/\/www.africa-press.net\/senegal\/politique\/un-poisson-sans-dents-revolutionne-levolution"},"modified":"2025-08-17T23:47:50","modified_gmt":"2025-08-17T23:47:50","slug":"un-poisson-sans-dents-revolutionne-levolution","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/un-poisson-sans-dents-revolutionne-levolution","title":{"rendered":"Un Poisson sans Dents R\u00e9volutionne L\u2019\u00c9volution"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; Senegal. <\/strong><\/span>A\u0300 premie\u0300re vue, Norselaspis glacialis ne paie pas de mine. Son cra\u0302ne fossilise\u0301, de\u0301couvert il y a plusieurs anne\u0301es au Spitzberg sur l\u2019archipel du Svalbard, est a\u0300 peine plus grand qu\u2019un ongle. Il semblait trop petit pour livrer beaucoup d\u2019informations mais gra\u0302ce a\u0300 une microtomographie synchrotron, re\u0301alise\u0301e a\u0300 la source suisse SLS, les chercheurs ont obtenu un mode\u0300le 3D d\u2019une pre\u0301cision exceptionnelle. Il re\u0301ve\u0300le l\u2019anatomie interne de ce poisson du De\u0301vonien infe\u0301rieur (410 a\u0300 407 millions d\u2019anne\u0301es).<\/p>\n<p><b>Le c\u0153ur d\u2019un requin sous la peau d\u2019une lamproie<\/b><\/p>\n<p>\u00ab C\u2019est comme si on ouvrait une capsule temporelle \u00bb, explique, dans un communique\u0301, Tetsuto Miyashita, du Muse\u0301e canadien de la Nature, qui a dirige\u0301 l\u2019e\u0301tude. Et ce qu\u2019il y a de\u0301couvert chamboule un sce\u0301nario bien e\u0301tabli. Jusque-la\u0300, les pale\u0301ontologues pensaient que la nage rapide et la pre\u0301dation n\u2019e\u0301taient apparues qu\u2019apre\u0300s l\u2019e\u0301volution des ma\u0302choires. Or, Norselaspis glacialis affiche de\u0301ja\u0300 des traits associe\u0301s aux verte\u0301bre\u0301s a\u0300 ma\u0302choires: une oreille interne de\u0301veloppe\u0301e avec un vestibule haut ainsi que des otoconies (les cristaux implique\u0301s dans l\u2019e\u0301quilibre chez les humains) encore en place.<\/p>\n<p>Son syste\u0300me sensoriel semble donc capable de de\u0301tecter les vibrations, de percevoir l\u2019orientation et les acce\u0301le\u0301rations. Dans ses orbites, les empreintes de 7 muscles oculaires re\u0301ve\u0300lent aussi un contro\u0302le visuel fin, preuve qu\u2019un tel agencement e\u0301tait de\u0301ja\u0300 pre\u0301sent chez les premiers verte\u0301bre\u0301s.<\/p>\n<p>A l\u2019inte\u0301rieur du corps, les restes du c\u0153ur re\u0301ve\u0300lent une pompe de grande taille relie\u0301e a\u0300 un re\u0301seau de vaisseaux conc\u0327u pour alimenter rapidement tout le corps. \u00ab On pourrait dire que Norselaspis avait le c\u0153ur d\u2019un requin sous la peau d\u2019une lamproie \u00bb, re\u0301sume Tetsuto Miyashita.<\/p>\n<p><b>Un sprinteur des grands fonds<\/b><\/p>\n<p>Ses nageoires pectorales sont fixe\u0301es sur une solide ceinture osseuse et sont oriente\u0301es vers l\u2019avant et le bas. Elles sont adapte\u0301es aux mouvements rapides, acce\u0301le\u0301ration, freinage ou changements de direction brusques. Ces caracte\u0301ristiques e\u0301taient jusqu\u2019ici associe\u0301es a\u0300 des poissons apparus plus tard, dote\u0301s de ma\u0302choires et de dents pour capturer leurs proies. Les ma\u0302choires, concluent les chercheurs dans un publication dans la revue Nature, n\u2019ont pas de\u0301clenche\u0301 la re\u0301volution des verte\u0301bre\u0301s, elles sont venues en profiter apre\u0300s coup.<\/p>\n<p>Pour les auteurs, cette e\u0301volution pre\u0301coce pourrait e\u0302tre lie\u0301e a\u0300 un grand bouleversement e\u0301cologique, la \u00ab Nekton Revolution \u00bb, un terme qui de\u0301signe les organismes aquatiques capables de se de\u0301placer activement, contrairement au plancton passif. A cette e\u0301poque (il y a environ 410 a\u0300 400 millions d\u2019anne\u0301es), les cre\u0301atures marines se sont mises a\u0300 conque\u0301rir l\u2019ensemble des milieux marins possibles, au large comme en profondeur. Dans ce contexte, Norselaspis apparai\u0302t comme un sprinteur des fonds marins, capable d\u2019e\u0301chapper aux menaces et de se faufiler entre les courants. \u00ab Nous manquions d\u2019images interme\u0301diaires pour comprendre l\u2019ordre d\u2019apparition de ces innovations \u00bb, pre\u0301cise Michael Coates, de l\u2019Universite\u0301 de Chicago. \u00ab Cette de\u0301couverte change notre manie\u0300re de voir les de\u0301buts des verte\u0301bre\u0301s \u00bb.<\/p>\n<p><strong>Pour plus d&rsquo;informations et d&rsquo;analyses sur la <span style=\"color: #ff6600\">Senegal<\/span>, suivez <span style=\"color: #ff6600\">Africa-Press<\/span><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; Senegal. A\u0300 premie\u0300re vue, Norselaspis glacialis ne paie pas de mine. Son cra\u0302ne fossilise\u0301, de\u0301couvert il y a plusieurs anne\u0301es au Spitzberg sur l\u2019archipel du Svalbard, est a\u0300 peine plus grand qu\u2019un ongle. Il semblait trop petit pour livrer beaucoup d\u2019informations mais gra\u0302ce a\u0300 une microtomographie synchrotron, re\u0301alise\u0301e a\u0300 la source suisse SLS, [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":70616,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[44],"class_list":["post-70617","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-senegal-2"],"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 Poisson sans Dents R\u00e9volutionne L\u2019\u00c9volution - Senegal<\/title>\n<meta name=\"description\" content=\"A\u0300 premie\u0300re vue, Norselaspis glacialis ne paie pas de mine. 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