{"id":233,"date":"2022-07-25T13:49:24","date_gmt":"2022-07-25T11:49:24","guid":{"rendered":"https:\/\/blogs.ua.es\/messinianalicante\/?p=233"},"modified":"2025-07-03T13:32:30","modified_gmt":"2025-07-03T11:32:30","slug":"origin-of-the-amaurolithus-ceratolith","status":"publish","type":"post","link":"https:\/\/blogs.ua.es\/messinianalicante\/2022\/07\/25\/origin-of-the-amaurolithus-ceratolith\/","title":{"rendered":"Origin of the ceratolith genus Amaurolithus"},"content":{"rendered":"<p><span class=\"Apple-converted-space\">\u00a0<\/span>Sediment samples from Ocean Drilling Program (ODP) Sites 999 and 1237 in the Caribbean Sea and Eastern Pacific Ocean were studied to monitor the evolution of ceratoliths from 7.4 Ma to 6 Ma. <i>Orthorhabdus rugosus <\/i>shows high variability at the end of the Tortonian to the Early Messinian (7.35 Ma to 6.91 Ma), resulting in the <i>Amaurolithus <\/i>(7.354 Ma) and <i>Nicklithus <\/i>branches (6.985 Ma). <i>Orthorhabdus rugosus <\/i>is an ortholith with three blades (sinistral, median, and dextral). The first ceratholith, <i>A. primus<\/i>, has two arms and a horseshoe shape with marked laths, and is stable and concave upwards. Its sinistral arm is formed from the sinistral blade of <i>Orthorhabdus rugosus <\/i>and the right arm is formed from the other blades.<\/p>\n<p>The sudden appearance of <i>A. primus <\/i>in the sedimentary record at around 7.35 Ma was observed in both studied sections . The\u00a0\u00a0Figure shows the set modifications of <i>O. rugosus <\/i>producing the early <i>A. primus. <\/i>The modifications are not a gradual evolutionary sequence of intermediate progressively modified forms but occur simultaneously as they are present from the beginning of the first recorded specimens. <i>Amaurolithus primus <\/i>coexisted with the <i>O. rugosus <\/i>ancestor in the studied samples.<span class=\"Apple-converted-space\">\u00a0<\/span><\/p>\n<div id=\"attachment_235\" style=\"width: 510px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-235\" class=\"wp-image-235\" src=\"https:\/\/blogs.ua.es\/messinianalicante\/files\/2022\/07\/orthorhabdus1.jpg\" alt=\"\" width=\"500\" height=\"375\" srcset=\"https:\/\/blogs.ua.es\/messinianalicante\/files\/2022\/07\/orthorhabdus1.jpg 1020w, https:\/\/blogs.ua.es\/messinianalicante\/files\/2022\/07\/orthorhabdus1-300x225.jpg 300w, https:\/\/blogs.ua.es\/messinianalicante\/files\/2022\/07\/orthorhabdus1-768x576.jpg 768w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><p id=\"caption-attachment-235\" class=\"wp-caption-text\">Modification on O. rugosus: Shortening of the specimen; Sinistral blade (blue): Lateral lengthening and its end portion curved upwards, concave to the observer; Dextral blade (green): Rotates backward; Median blade (red): Elevates and becomes more robust showing more marked teeth.<\/p><\/div>\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>\u00a0Sediment samples from Ocean Drilling Program (ODP) Sites 999 and 1237 in the Caribbean Sea and Eastern Pacific Ocean were studied to monitor the evolution of ceratoliths from 7.4 Ma to 6 Ma. Orthorhabdus rugosus shows high variability at the &hellip; <a href=\"https:\/\/blogs.ua.es\/messinianalicante\/2022\/07\/25\/origin-of-the-amaurolithus-ceratolith\/\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/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":[2392899,2324042,2393098],"class_list":["post-233","post","type-post","status-publish","format-standard","hentry","category-messinian","category-nannofossils","category-pid2020-114381gb-i00","tag-amaurolithus","tag-messinian","tag-orthorhabdus"],"_links":{"self":[{"href":"https:\/\/blogs.ua.es\/messinianalicante\/wp-json\/wp\/v2\/posts\/233","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=233"}],"version-history":[{"count":7,"href":"https:\/\/blogs.ua.es\/messinianalicante\/wp-json\/wp\/v2\/posts\/233\/revisions"}],"predecessor-version":[{"id":242,"href":"https:\/\/blogs.ua.es\/messinianalicante\/wp-json\/wp\/v2\/posts\/233\/revisions\/242"}],"wp:attachment":[{"href":"https:\/\/blogs.ua.es\/messinianalicante\/wp-json\/wp\/v2\/media?parent=233"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.ua.es\/messinianalicante\/wp-json\/wp\/v2\/categories?post=233"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.ua.es\/messinianalicante\/wp-json\/wp\/v2\/tags?post=233"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}