{"id":71087,"date":"2025-09-09T12:00:00","date_gmt":"2025-09-09T12:00:00","guid":{"rendered":"https:\/\/www.africa-press.net\/senegal\/politique\/chimeres-developpent-v-elles-de-vraies-dents-sur-le-front"},"modified":"2025-09-10T00:12:21","modified_gmt":"2025-09-10T00:12:21","slug":"chimeres-developpent-v-elles-de-vraies-dents-sur-le-front","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/chimeres-developpent-v-elles-de-vraies-dents-sur-le-front","title":{"rendered":"Chim\u00e8res D\u00e9veloppent-V-elles de Vraies Dents sur le Front"},"content":{"rendered":"

Africa-Press – Senegal. <\/strong><\/span>Les chime\u0300res \u2013 aussi appele\u0301es \u00ab requins-fanto\u0302mes \u00bb \u2013 sont des poissons fabuleux. Les ma\u0302les de\u0301veloppent un e\u0301trange appendice facial cartilagineux articule\u0301: le tenaculum. Celui-ci, en forme de massue, peut s\u2019e\u0301tirer ou se re\u0301tracter. Il pre\u0301sente d\u2019e\u0301tranges dents dont la formation est mal comprise. Son utilite\u0301 aussi pose question, mais des vide\u0301os laissent penser que cet appendice pourrait e\u0302tre utilise\u0301 lors de la copulation: les ma\u0302les s\u2019en servent pour agripper les nageoires pectorales des femelles. Certaines d\u2019entre elles pre\u0301sentent d\u2019ailleurs des cicatrices.<\/p>\n

Trois chercheurs ame\u0301ricains ont tente\u0301 de percer les secrets de ce tenaculum. Gra\u0302ce a\u0300 l\u2019histologie, la ge\u0301ne\u0301tique et l\u2019utilisation d\u2019une technique d\u2019imagerie, ils ont mene\u0301 leur enque\u0302te sur une espe\u0300ce en particulier, la chime\u0300re tachete\u0301e (Hydrolagus colliei). Et leurs re\u0301sultats re\u0301ve\u0300lent que le tenaculum de\u0301veloppe bien des dents… tre\u0300s proches de celles des requins, leurs lointains parents !<\/p>\n

De vraies dents, mais a\u0300 l\u2019exte\u0301rieur de la ma\u0302choire<\/b><\/p>\n

L\u2019appendice commence a\u0300 se former durant le de\u0301veloppement embryonnaire et continue de grandir au cours des derniers stades du de\u0301veloppement juve\u0301nile des ma\u0302les. Les dents, quant a\u0300 elles, prennent forment lorsque les poissons atteignent une taille comprise entre 30 cm et 50 cm. Elles sont courbe\u0301es, coniques et e\u0301mergent depuis l\u2019inte\u0301rieur du tenaculum en range\u0301es successives (sept en moyenne).<\/p>\n

\u00ab Nous avons de\u0301couvert que les dents de cet e\u0301trange appendice ressemblent beaucoup a\u0300 des range\u0301es de dents de requin. La capacite\u0301 de fabriquer des dents s\u2019est transmise a\u0300 cet appendice, probablement depuis la bouche \u00bb, remarque dans un communique\u0301 le chercheur Gareth Fraser, co-auteur de cette e\u0301tude publie\u0301e dans PNAS.<\/p>\n

D\u2019apre\u0300s ces re\u0301sultats, il s\u2019agirait donc de ve\u0301ritables dents se de\u0301veloppant hors des ma\u0302choires et non pas d\u2019une pa\u0302le imitation qui ne serait en re\u0301alite\u0301 que des e\u0301cailles particulie\u0300res. D\u2019ailleurs, ces dents expriment des ge\u0300nes identiques a\u0300 celles pre\u0301sentes dans la cavite\u0301 buccale.<\/p>\n

Pour les chercheurs, ces re\u0301sultats contribuent a\u0300 prouver que la denture des verte\u0301bre\u0301s n\u2019est pas strictement confine\u0301e a\u0300 la cavite\u0301 buccale. L\u2019e\u0301volution peut conduire a\u0300 des adaptations e\u0301tonnantes. Une e\u0301trangete\u0301 que les auteurs de cette e\u0301tude ont baptise\u0301e \u00ab bricolage e\u0301volutif \u00bb.<\/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. Les chime\u0300res \u2013 aussi appele\u0301es \u00ab requins-fanto\u0302mes \u00bb \u2013 sont des poissons fabuleux. Les ma\u0302les de\u0301veloppent un e\u0301trange appendice facial cartilagineux articule\u0301: le tenaculum. Celui-ci, en forme de massue, peut s\u2019e\u0301tirer ou se re\u0301tracter. Il pre\u0301sente d\u2019e\u0301tranges dents dont la formation est mal comprise. Son utilite\u0301 aussi pose question, mais des vide\u0301os […]<\/p>\n","protected":false},"author":82,"featured_media":71086,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[44],"class_list":["post-71087","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-senegal-2"],"yoast_head":"\nChim\u00e8res D\u00e9veloppent-V-elles de Vraies Dents sur le Front - Senegal<\/title>\n<meta name=\"description\" content=\"Les chime\u0300res \u2013 aussi appele\u0301es \u00ab requins-fanto\u0302mes \u00bb \u2013 sont des poissons fabuleux. 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