{"id":1302,"date":"2023-08-30T16:14:42","date_gmt":"2023-08-30T14:14:42","guid":{"rendered":"https:\/\/wp.unil.ch\/paleo\/?p=1302"},"modified":"2024-09-25T11:48:15","modified_gmt":"2024-09-25T09:48:15","slug":"gilsonicaris-not-an-early-devonian-anostracan-but-a-polychaete-annelid","status":"publish","type":"post","link":"https:\/\/wp.unil.ch\/paleo\/2023\/08\/gilsonicaris-not-an-early-devonian-anostracan-but-a-polychaete-annelid\/","title":{"rendered":"Gilsonicaris, not an Early Devonian anostracan but a polychaete annelid"},"content":{"rendered":"\n<p>In an article published today in&nbsp;<em>Biology Letters<\/em>, AnomLab postdoc Pierre Gueriau and his collaborators have resolved an 80-year-old mystery by deciphering the true nature of a 400-million-year-old marine creature from Germany. Since its initial description in 1943, this fossil, named&nbsp;<em>Gilsonicaris rhenanus<\/em>, has perplexed scientists who have alternatively interpreted it as an anostracan crustacean (&#8216;fairy or brine shrimp&#8217;), a myriapod, or even a part of a starfish arm. Using a 3D X-ray scanner, the team reveals that <em>Gilsonicaris<\/em> is, in fact, a polychaete annelid (&#8216;bristle worm&#8217;). This discovery unequivocally dismisses the existence of marine anostracans 400 million years ago, while also offering a wealth of new information regarding the early evolutionary history of bristle worms and their soft tissues.<\/p>\n\n\n\n<div style=\"height:25px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"Gilsonicaris, not an Early Devonian anostracan crustacean but a polychaete annelid\" width=\"720\" height=\"405\" src=\"https:\/\/www.youtube.com\/embed\/-AmKIALM1kc?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" allowfullscreen><\/iframe>\n<\/div><figcaption class=\"wp-element-caption\">A video summarizing the research<\/figcaption><\/figure>\n\n\n\n<div style=\"height:25px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"has-text-align-left\">A 3D model that can be manipulated at will is available on <a href=\"https:\/\/skfb.ly\/ow8w7\" target=\"_blank\" rel=\"noreferrer noopener\">Sketchfab<\/a>.<\/p>\n\n\n\n<div style=\"height:25px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p>Reference: Gueriau P., Parry L.A. &amp; Rabet N. 2023<em>.\u00a0Gilsonicaris<\/em>\u00a0from the Lower Devonian Hunsr\u00fcck slate is a eunicidan annelid and not the oldest crown anostracan crustacean.\u00a0<em>Biology\u00a0Letters<\/em>\u00a019: 20230312.\u00a0<a href=\"https:\/\/royalsocietypublishing.org\/doi\/full\/10.1098\/rsbl.2023.0312\" target=\"_blank\" rel=\"noreferrer noopener\">Find the article (<strong><em>Open Access<\/em><\/strong>) here<\/a>.<\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>In an article published today in&nbsp;Biology Letters, AnomLab postdoc Pierre Gueriau and his collaborators have resolved an 80-year-old mystery by deciphering the true nature of a 400-million-year-old marine creature from Germany. Since its initial description in 1943, this fossil, named&nbsp;Gilsonicaris<\/p>\n","protected":false},"author":1002590,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_seopress_robots_primary_cat":"","_seopress_titles_title":"","_seopress_titles_desc":"","_seopress_robots_index":"","footnotes":""},"categories":[1],"tags":[],"class_list":{"0":"post-1302","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-uncategorized"},"_links":{"self":[{"href":"https:\/\/wp.unil.ch\/paleo\/wp-json\/wp\/v2\/posts\/1302","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wp.unil.ch\/paleo\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/wp.unil.ch\/paleo\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/wp.unil.ch\/paleo\/wp-json\/wp\/v2\/users\/1002590"}],"replies":[{"embeddable":true,"href":"https:\/\/wp.unil.ch\/paleo\/wp-json\/wp\/v2\/comments?post=1302"}],"version-history":[{"count":5,"href":"https:\/\/wp.unil.ch\/paleo\/wp-json\/wp\/v2\/posts\/1302\/revisions"}],"predecessor-version":[{"id":1433,"href":"https:\/\/wp.unil.ch\/paleo\/wp-json\/wp\/v2\/posts\/1302\/revisions\/1433"}],"wp:attachment":[{"href":"https:\/\/wp.unil.ch\/paleo\/wp-json\/wp\/v2\/media?parent=1302"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wp.unil.ch\/paleo\/wp-json\/wp\/v2\/categories?post=1302"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wp.unil.ch\/paleo\/wp-json\/wp\/v2\/tags?post=1302"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}