{"id":6630,"date":"2017-02-02T19:00:56","date_gmt":"2017-02-02T21:00:56","guid":{"rendered":"https:\/\/blog.mindthegraph.com\/?p=6630"},"modified":"2022-10-14T11:22:01","modified_gmt":"2022-10-14T14:22:01","slug":"ancestral-arthropod","status":"publish","type":"post","link":"https:\/\/mindthegraph.com\/blog\/fr\/arthropode-ancestral\/","title":{"rendered":"Un pas de plus vers l'arthropode ancestral"},"content":{"rendered":"<p><span style=\"font-weight: 400;\">Une esp\u00e8ce r\u00e9cemment d\u00e9couverte pourrait nous rapprocher un peu plus de l'arthropode ancestral. Cette petite esp\u00e8ce de lobopodien a environ 500 millions d'ann\u00e9es et ressemble \u00e0 un ver - \u00e0 l'exception de ses 20 \u00e0 30 pattes. <\/span><\/p>\n<p><span style=\"font-weight: 400;\">En dehors de la quantit\u00e9 de jambes, cette petite cr\u00e9ature appel\u00e9e <\/span><i><span style=\"font-weight: 400;\">Ovatiovermis cribratus<\/span><\/i><span style=\"font-weight: 400;\"> a d'autres caract\u00e9ristiques int\u00e9ressantes. Vivant dans les profondeurs de la mer pendant le Cambrien, la <\/span><i><span style=\"font-weight: 400;\">Ovatiovermis cribratus <\/span><\/i><span style=\"font-weight: 400;\">s'ancrait au fond de l'oc\u00e9an et utilisait ses pattes pour filtrer l'eau. Ce comportement alimentaire rappelle une petite danse, comme vous pouvez le voir dans cette \u00e9tonnante vid\u00e9o 3D :<\/span><\/p>\n<p><iframe loading=\"lazy\" title=\"Lobopodien de 500 millions d&#039;ann\u00e9es\" width=\"800\" height=\"450\" src=\"https:\/\/www.youtube.com\/embed\/emUXb8lejNo?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen><\/iframe><\/p>\n<p><span style=\"font-weight: 400;\">Les scientifiques tentent de construire l'arbre de l'\u00e9volution des arthropodes sur la base de ces nouvelles d\u00e9couvertes. Cependant, deux probl\u00e8mes principaux les retiennent encore :<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Les lobopodiens sont \u00e9teints. Cela signifie que nous ne pouvons pas obtenir de donn\u00e9es mol\u00e9culaires pour construire leur arbre g\u00e9n\u00e9alogique comme nous le faisons avec les esp\u00e8ces vivantes. Le moyen de contourner ce probl\u00e8me est de rechercher des fossiles et des informations anatomiques qui pourraient aider \u00e0 construire un sc\u00e9nario d'\u00e9volution.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Bien que d'autres fossiles de lobopodes aient \u00e9t\u00e9 trouv\u00e9s, ils pr\u00e9sentent une grande diversit\u00e9 et disparit\u00e9 entre eux. Parmi les nombreux fossiles contemporains, il est difficile de d\u00e9terminer les v\u00e9ritables branches ancestrales.<\/span><\/li>\n<\/ul>\n<p><a href=\"http:\/\/blogs.biomedcentral.com\/bmcseriesblog\/2017\/01\/31\/newly-discovered-500-million-year-old-species-offers-insights-ancestral-arthropod\/\"><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter wp-image-6631\" src=\"https:\/\/blog.mindthegraph.com\/wp-content\/uploads\/2017\/02\/lobopodian-768x952.jpg\" alt=\"Un pas de plus vers l&#039;arthropode ancestral\" width=\"457\" height=\"566\" srcset=\"https:\/\/mindthegraph.com\/blog\/wp-content\/uploads\/2017\/02\/lobopodian-768x952.jpg 768w, https:\/\/mindthegraph.com\/blog\/wp-content\/uploads\/2017\/02\/lobopodian-768x952-242x300.jpg 242w\" sizes=\"(max-width: 457px) 100vw, 457px\" \/><\/a><\/p>\n<h4><strong>Alors pourquoi toute cette agitation autour d'un nouveau fossile lobopodien ?<\/strong><\/h4>\n<p><span style=\"font-weight: 400;\">Le groupe des arthropodes - dont font partie les lobopodiens - est l'un des groupes d'animaux les mieux connus, couvrant 80% de toutes les esp\u00e8ces connues. En outre, le mode d'alimentation des lobopodiens r\u00e9v\u00e8le une trace importante dans l'\u00e9volution de tous les arthropodes.<\/span><\/p>\n<blockquote><p><span style=\"font-weight: 400;\">Bien <\/span><i><span style=\"font-weight: 400;\">Ovatiovermis <\/span><\/i><span style=\"font-weight: 400;\">(<\/span><i><span style=\"font-weight: 400;\">Ovatio<\/span><\/i><span style=\"font-weight: 400;\"> - Ovation, <\/span><i><span style=\"font-weight: 400;\">vermis<\/span><\/i><span style=\"font-weight: 400;\"> - ), vous avez r\u00e9v\u00e9l\u00e9 que l'anc\u00eatre de &gt;80% des esp\u00e8ces animales \u00e9tait un filtreur, levez-vous et applaudissez-vous ! - Dave Marshall pour BioMed Central (<a href=\"http:\/\/blogs.biomedcentral.com\/bmcseriesblog\/2017\/01\/31\/newly-discovered-500-million-year-old-species-offers-insights-ancestral-arthropod\/\">lire l'article complet ici<\/a>)<\/span><\/p><\/blockquote>\n<p><a href=\"http:\/\/blogs.biomedcentral.com\/bmcseriesblog\/2017\/01\/31\/newly-discovered-500-million-year-old-species-offers-insights-ancestral-arthropod\/\"><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter wp-image-6632 size-full\" src=\"https:\/\/blog.mindthegraph.com\/wp-content\/uploads\/2017\/02\/ovatiovermis.jpg\" alt=\"Un pas de plus vers l&#039;arthropode ancestral\" width=\"800\" height=\"246\" \/><\/a><\/p>\n<p><span style=\"font-weight: 400;\">Malgr\u00e9 toutes les nouvelles informations sur cet arthropode ancestral, une question demeure : les gens trouvent-ils les lobopodiens aussi effrayants que leurs parents vivants ?<\/span><a href=\"https:\/\/blog.mindthegraph.com\/wp-content\/uploads\/2016\/06\/i-love-science.png\"><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter wp-image-5826\" src=\"https:\/\/blog.mindthegraph.com\/wp-content\/uploads\/2016\/06\/i-love-science.png\" alt=\"Un pas de plus vers l&#039;arthropode ancestral\" width=\"380\" height=\"152\" srcset=\"https:\/\/mindthegraph.com\/blog\/wp-content\/uploads\/2016\/06\/i-love-science.png 1500w, https:\/\/mindthegraph.com\/blog\/wp-content\/uploads\/2016\/06\/i-love-science-300x120.png 300w, https:\/\/mindthegraph.com\/blog\/wp-content\/uploads\/2016\/06\/i-love-science-1024x410.png 1024w\" sizes=\"(max-width: 380px) 100vw, 380px\" \/><\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>Une esp\u00e8ce r\u00e9cemment d\u00e9couverte pourrait nous rapprocher un peu plus de l'arthropode ancestral. Cette petite esp\u00e8ce de lobopodien a environ 500 millions d'ann\u00e9es et ressemble \u00e0 un ver - \u00e0 l'exception de ses 20 \u00e0 30 pattes. Outre la quantit\u00e9 de pattes, cette petite cr\u00e9ature appel\u00e9e Ovatiovermis cribratus pr\u00e9sente d'autres caract\u00e9ristiques int\u00e9ressantes. Vivant [...]<\/p>","protected":false},"author":11,"featured_media":6638,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"image","meta":[],"categories":[959,28],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v19.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>One step closer to the ancestral arthropod - Mind the Graph Blog<\/title>\n<meta name=\"description\" content=\"A newly discovered species may bring us one step closer to the ancestral arthropod. 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