{"id":244,"date":"2022-08-29T10:05:45","date_gmt":"2022-08-29T08:05:45","guid":{"rendered":"https:\/\/blogs.ua.es\/messinianalicante\/?p=244"},"modified":"2025-07-03T13:31:00","modified_gmt":"2025-07-03T11:31:00","slug":"evolution-of-amaurolithus-amaurolithus-delicatus-marking-the-messinian-bottom","status":"publish","type":"post","link":"https:\/\/blogs.ua.es\/messinianalicante\/2022\/08\/29\/evolution-of-amaurolithus-amaurolithus-delicatus-marking-the-messinian-bottom\/","title":{"rendered":"Evolution of Amaurolithus: Amaurolithus delicatus marking the Messinian bottom"},"content":{"rendered":"<p>After a complete study of the sediment samples from Ocean Drilling Program (ODP) Sites 999 and 1237 in the Caribbean Sea and Eastern Pacific Ocean in order to monitor the evolution of ceratoliths. The First Occurrence of\u00a0<em>Amaurolithus delicatus <\/em>marks the bottom of the Messinian Stage.\u00a0The first ceratholith, <i>A. primus<\/i>, has two arms and a horseshoe shape with marked laths, and is stable and concave upwards having three blades (sinistral=blue, median=red, and dextral= green).<\/p>\n<p>Early robust <i>A. primus <\/i>evolved into stylised forms and then to <i>Amaurolithus delicatus <\/i>(7.226 Ma), an almost plain horseshoe ceratolith with two arms. The left arm, usually the longer one, comes from the sinistral wing of <i>A. primus <\/i>and has a characteristic flattened omega section (\u03a9) without laths. There is a distribution overlap between <i>A. primus <\/i>and <i>A. delicatus<\/i>; the highest occurrence of the first one, at 6.282 Ma, is a newly proposed bioevent for the Messinian. After this, <i>Amaurolithus <\/i>does not have laths on its longer left arm and should be included in <i>A. delicatus<\/i>.<span class=\"Apple-converted-space\">\u00a0<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-247\" src=\"https:\/\/blogs.ua.es\/messinianalicante\/files\/2022\/08\/delicatus-888x1024.jpg\" alt=\"\" width=\"600\" height=\"692\" srcset=\"https:\/\/blogs.ua.es\/messinianalicante\/files\/2022\/08\/delicatus-888x1024.jpg 888w, https:\/\/blogs.ua.es\/messinianalicante\/files\/2022\/08\/delicatus-260x300.jpg 260w, https:\/\/blogs.ua.es\/messinianalicante\/files\/2022\/08\/delicatus-768x886.jpg 768w, https:\/\/blogs.ua.es\/messinianalicante\/files\/2022\/08\/delicatus.jpg 1081w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/p>\n<p>Cite as:\u00a0<a href=\"https:\/\/www.sciencedirect.com\/science\/article\/pii\/S037783982200072X\">Lancis, C., Tent-Mancl\u00fas, J.-E., Flores, J.-A<\/a>., 2022. Origin and evolutionary trends of the Neogene genera <em>Amaurolithus<\/em> and <em>Nicklithus<\/em> (calcareous nannofossils). Mar. Micropaleontol. 175, 102156. https:\/\/doi.org\/https:\/\/doi.org\/10.1016\/j.marmicro.2022.102156<\/p>\n","protected":false},"excerpt":{"rendered":"<p>After a complete study of the sediment samples from Ocean Drilling Program (ODP) Sites 999 and 1237 in the Caribbean Sea and Eastern Pacific Ocean in order to monitor the evolution of ceratoliths. The First Occurrence of\u00a0Amaurolithus delicatus marks the bottom of the Messinian Stage.\u00a0The first ceratholith, A. primus, has two arms and a horseshoe [&hellip;]<\/p>\n","protected":false},"author":4347,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2324042,2392628,2421051],"tags":[2411284,2411634,2392899,2324042,2411155],"class_list":["post-244","post","type-post","status-publish","format-standard","hentry","category-messinian","category-nannofossils","category-pid2020-114381gb-i00","tag-a-delicatus","tag-a-primus","tag-amaurolithus","tag-messinian","tag-nannplankton-evolution"],"_links":{"self":[{"href":"https:\/\/blogs.ua.es\/messinianalicante\/wp-json\/wp\/v2\/posts\/244","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blogs.ua.es\/messinianalicante\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blogs.ua.es\/messinianalicante\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blogs.ua.es\/messinianalicante\/wp-json\/wp\/v2\/users\/4347"}],"replies":[{"embeddable":true,"href":"https:\/\/blogs.ua.es\/messinianalicante\/wp-json\/wp\/v2\/comments?post=244"}],"version-history":[{"count":7,"href":"https:\/\/blogs.ua.es\/messinianalicante\/wp-json\/wp\/v2\/posts\/244\/revisions"}],"predecessor-version":[{"id":252,"href":"https:\/\/blogs.ua.es\/messinianalicante\/wp-json\/wp\/v2\/posts\/244\/revisions\/252"}],"wp:attachment":[{"href":"https:\/\/blogs.ua.es\/messinianalicante\/wp-json\/wp\/v2\/media?parent=244"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.ua.es\/messinianalicante\/wp-json\/wp\/v2\/categories?post=244"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.ua.es\/messinianalicante\/wp-json\/wp\/v2\/tags?post=244"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}