{"id":4150,"date":"2012-10-23T09:35:42","date_gmt":"2012-10-23T08:35:42","guid":{"rendered":"http:\/\/www.clairejannot.com\/?p=4150"},"modified":"2020-03-13T09:24:25","modified_gmt":"2020-03-13T08:24:25","slug":"le-complexe-cerveau-dun-fossile-darthropode-3","status":"publish","type":"post","link":"https:\/\/claire-jannot.com\/?p=4150","title":{"rendered":"Le complexe cerveau d\u2019un fossile d\u2019arthropode"},"content":{"rendered":"

Publiant leurs travaux le 10 octobre dans\u00a0Nature, des chercheurs am\u00e9ricains et britanniques ont d\u00e9couvert en Chine le fossile d\u2019un arthropode du Cambrien qui r\u00e9v\u00e8le un cerveau d\u00e9j\u00e0 complexe chez cet anc\u00eatre des insectes et des crustac\u00e9s.<\/span><\/h2>\n

\"\"<\/span><\/a>Protoc\u00e9r\u00e9bron, deutocerebrum et tritocerebron : telles sont les 3 parties du cerveau des insectes et crustac\u00e9s sup\u00e9rieurs actuels<\/strong>, un organe plus complexe que celui des branchiopodes (crevettes).<\/strong> N\u00e9anmoins, les sp\u00e9cialistes ignoraient jusqu\u2019\u00e0 pr\u00e9sent ce qu’il en \u00e9tait de l\u2019anc\u00eatre commun \u00e0 tous ces animaux (les arthropodes).<\/strong> Poss\u00e9dait-il un cerveau primitif, rest\u00e9 tel chez les branchiopodes mais ayant davantage \u00e9volu\u00e9 chez les autres crustac\u00e9s et les insectes, ou bien poss\u00e9dait-il d\u00e9j\u00e0 un cerveau (relativement) complexe, qui aurait ensuite r\u00e9gress\u00e9 chez les branchiopodes actuels ?<\/span><\/p>\n

L\u2019\u00e9quipe de Nicholas Strausfeld, directeur du laboratoire d\u2019entomologie de l’Universit\u00e9 de l’Arizona<\/strong> est parvenue \u00e0 r\u00e9pondre \u00e0 la question gr\u00e2ce \u00e0 un fossile\u00a0pas comme les autres. D\u00e9couvert dans le Yunnan en Chine, celui-ci appartient \u00e0 un animal connu sous le nom de\u00a0Fuxianhuia protensa\u00a0et remonterait \u00e0 quelque 520 millions d’ann\u00e9es.<\/strong> Dans l\u2019exosquelette fossilis\u00e9 de l\u2019animal se trouve ainsi la plus ancienne trace de cerveau d\u2019arthropode\u00a0jamais d\u00e9couverte.<\/strong> Or, ce cerveau, comportant 3 parties, est tr\u00e8s semblable \u00e0 celui des insectes modernes,<\/strong> ce qui confirmerait l\u2019hypoth\u00e8se d\u2019un anc\u00eatre d\u00e9j\u00e0 bien \u00e9quip\u00e9 sur le plan c\u00e9r\u00e9bral.<\/span><\/p>\n

\u00ab\u00a0Beaucoup de gens n’aiment pas cette id\u00e9e de partager [la possession d\u2019] un cerveau avec un invert\u00e9br\u00e9, mais il y a de bons indices sugg\u00e9rant que c\u2019est bien le cas\u00a0\u00bb<\/strong>, a d\u00e9clar\u00e9 Strausfeld \u00e0\u00a0LiveScience.<\/span><\/p>\n

\u00a0<\/span><\/p>\n

\u00a0L’article en entier sur : www.maxisciences.com<\/span><\/p>\n

\u00a0<\/span><\/p>\n

Source : www.maxisciences.com – Maxime Lambert, publi\u00e9e le 13 octobre 2012<\/em><\/em><\/address>\n
Cr\u00e9dit photo :\u00a0Le fossile d’arthropode vieux de 520 millions d’ann\u00e9es (cr\u00e9dits : Xiaoya Ma)<\/em><\/address>\n

\u00a0<\/span><\/p>\n

\u00a0<\/span><\/p>\n

\u00a0<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

Publiant leurs travaux le 10 octobre dans\u00a0Nature, des chercheurs am\u00e9ricains et britanniques ont d\u00e9couvert en Chine le fossile d\u2019un arthropode du Cambrien qui r\u00e9v\u00e8le un cerveau d\u00e9j\u00e0 complexe chez cet anc\u00eatre des insectes et des crustac\u00e9s. Protoc\u00e9r\u00e9bron, deutocerebrum et tritocerebron … Continuer la lecture →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[75],"tags":[76,4,5,48],"class_list":["post-4150","post","type-post","status-publish","format-standard","hentry","category-culture","tag-culture","tag-ecologie2","tag-environnement","tag-vie-animale"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p5jjt5-14W","_links":{"self":[{"href":"https:\/\/claire-jannot.com\/index.php?rest_route=\/wp\/v2\/posts\/4150","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/claire-jannot.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/claire-jannot.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/claire-jannot.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/claire-jannot.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=4150"}],"version-history":[{"count":1,"href":"https:\/\/claire-jannot.com\/index.php?rest_route=\/wp\/v2\/posts\/4150\/revisions"}],"predecessor-version":[{"id":5732,"href":"https:\/\/claire-jannot.com\/index.php?rest_route=\/wp\/v2\/posts\/4150\/revisions\/5732"}],"wp:attachment":[{"href":"https:\/\/claire-jannot.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=4150"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/claire-jannot.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=4150"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/claire-jannot.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=4150"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}