Origin and evolutionary trends of the Neogene genera Amaurolithus and Nicklithus (calcareous nannofossils)

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dc.contributorEvolución Geodinámica de la Cordillera Bética Oriental y de la Plataforma Marina de Alicantees_ES
dc.contributor.authorLancis Sáez, Carlos-
dc.contributor.authorTent-Manclus, Jose Enrique-
dc.contributor.authorFlores, José Abel-
dc.contributor.otherUniversidad de Alicante. Departamento de Ciencias de la Tierra y del Medio Ambientees_ES
dc.date.accessioned2022-07-14T06:03:00Z-
dc.date.available2022-07-14T06:03:00Z-
dc.date.issued2022-07-11-
dc.identifier.citationMarine Micropaleontology. 2022, 175: 102156. https://doi.org/10.1016/j.marmicro.2022.102156es_ES
dc.identifier.issn0377-8398 (Print)-
dc.identifier.issn1872-6186 (Online)-
dc.identifier.urihttp://hdl.handle.net/10045/125080-
dc.description.abstractSediment 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 end of the Tortonian to the Early Messinian (7.35 Ma to 6.91 Ma), resulting in the Amaurolithus (7.354 Ma) and Nicklithus branches (6.985 Ma). Orthorhabdus rugosus is an ortholith with three blades (sinistral, median, and dextral). The first ceratholith, A. primus, 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 O. rugosus and the right arm is formed from the other blades. Early robust A. primus evolved into stylised forms and then to A. delicatus (7.226 Ma), an almost plain horseshoe ceratolith with two arms. The left arm, usually the longer one, comes from the sinistral wing of A. primus and has a characteristic flattened omega section (Ω) without laths. There is a distribution overlap between A. primus and A. delicatus; the highest occurrence of the first one, at 6.282 Ma, is a newly proposed bioevent for the Messinian. After this, Amaurolithus does not have laths in its longer left arm and should be included in A. delicatus. The second branch has only one species, Nicklithus amplificus, which became extinct at 6.049 Ma. In addition, the dextral and median blades of O. rugosus form N. amplificus dextral arm and the sinistral arm, which has the characteristic beak, hook, or hawk's bill, which is the main difference between the development of this horseshoe and that of the previous one. The descriptions of A. primus, A. delicatus, and N. amplificus were specified based on the proposed evolutionary genesis.es_ES
dc.description.sponsorshipThis work was supported by projects RTI2018-099489-B-I00 and PID2020-114381GB-I00 (Spanish Ministry of Science, Innovation and Universities). This study was funded by the European Union NextGenerationEU project GVA-THINKINAZUL/2021/039.es_ES
dc.languageenges_ES
dc.publisherElsevieres_ES
dc.rights© 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).es_ES
dc.subjectCalcareous nannofossil evolutiones_ES
dc.subjectCeratolithses_ES
dc.subjectAmaurolithuses_ES
dc.subjectNicklithuses_ES
dc.subjectOrthorhabduses_ES
dc.subjectLate Neogenees_ES
dc.subjectODP Hole 999Aes_ES
dc.subjectODP Site 1237es_ES
dc.subject.otherGeodinámica Internaes_ES
dc.titleOrigin and evolutionary trends of the Neogene genera Amaurolithus and Nicklithus (calcareous nannofossils)es_ES
dc.typeinfo:eu-repo/semantics/articlees_ES
dc.peerreviewedsies_ES
dc.identifier.doi10.1016/j.marmicro.2022.102156-
dc.relation.publisherversionhttps://doi.org/10.1016/j.marmicro.2022.102156es_ES
dc.rights.accessRightsinfo:eu-repo/semantics/openAccesses_ES
dc.relation.projectIDinfo:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/RTI2018-099489-B-I00es_ES
dc.relation.projectIDinfo:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2020-114381GB-I00es_ES
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