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Enhancing dinoflagellate cyst classification through combined LM and SEM analysis

2025-05Artigo científico Acesso aberto
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dc.contributor.authorVieira, Manuel
dc.contributor.authorJolley, David
dc.contributor.authorZetter, Reinhard
dc.contributor.authorMahdi, Salih
dc.contributor.authorGrímsson, Friðgeir
dc.contributor.institutionGeoBioTec - Geobiociências, Geoengenharias e Geotecnologias
dc.contributor.institutionDCT - Departamento de Ciências da Terra
dc.contributor.pblElsevier Science B.V., Amsterdam.
dc.date.accessioned2025-06-20T21:14:40Z
dc.date.available2025-06-20T21:14:40Z
dc.date.issued2025-05
dc.descriptionPublisher Copyright: © 2025 The Authors
dc.description.abstractScanning Electron Microscopy (SEM) is underutilized in the taxonomic study of fossil dinoflagellate cysts, which are predominantly described through Light Microscopy (LM). However, SEM can complement LM by revealing detailed morphological features, such as ornamentation and perforations, that are often obscured under LM alone. This study applies the “single-grain method,” combining LM and SEM, to refine the taxonomic descriptions of Spiniferites magnificus and Fibradinium annetorpense. SEM observations revealed previously undocumented features in S. magnificus, including variable intergonal processes, perforated sutural crests, and robust trifurcate gonal processes. These findings refine its taxonomy and suggest environmental influences, such as salinity variations, on its morphological variability. Similarly, SEM analyses of F. annetorpense allowed the determination of the cyst tabulation and clarified the previous described fibrous outer wall structure as the result of continuous ridges and indentations across the crests formed at the edge of each paraplate. This has also highlighted the presence of nano sized indentations forming rings around the paraplates. Both species hold significant biostratigraphic value. Spiniferites magnificus serves as a key marker for the Late Danian in the North Sea Basin, with its extinction and inception coinciding with critical regional biozones. Fibradinium annetorpense has a wider stratigraphic range with reported occurrences from the Late Cretaceous to the Thanetian, but the specimens analyzed in this study are from upper Danian sediments collected in western Greenland.en
dc.description.versionpublishersversion
dc.description.versionpublished
dc.format.extent12
dc.format.extent12019070
dc.identifier.doi10.1016/j.revpalbo.2025.105300
dc.identifier.issn0034-6667
dc.identifier.otherPURE: 118933228
dc.identifier.otherPURE UUID: 3bdcbeb2-b4f7-4620-902b-e7f4f3db8d00
dc.identifier.otherScopus: 85217971356
dc.identifier.otherWOS: 001430201400001
dc.identifier.urihttp://hdl.handle.net/10362/184288
dc.identifier.urlhttps://www.scopus.com/pages/publications/85217971356
dc.identifier.urlhttps://www.webofscience.com/wos/woscc/full-record/WOS:001430201400001
dc.language.isoeng
dc.peerreviewedyes
dc.subjectDinoflagellate cysts
dc.subjectLight microscopy
dc.subjectMorphology
dc.subjectScanning electron microscopy
dc.subjectTaxonomic resolution
dc.subjectEcology, Evolution, Behavior and Systematics
dc.subjectPalaeontology
dc.titleEnhancing dinoflagellate cyst classification through combined LM and SEM analysisen
dc.title.subtitleA reassessment of Spiniferites magnificus and Fibradinium annetorpenseen
dc.typejournal article
degois.publication.firstPage1
degois.publication.lastPage12
degois.publication.titleReview Of Palaeobotany And Palynology
degois.publication.volume336
dspace.entity.typePublication
rcaap.rightsopenAccess

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