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An Ediacaran trace-like body fossil of a Palaeopascichnus specimen from Oman under 3D micro-tomography.

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Title: An Ediacaran trace-like body fossil of a Palaeopascichnus specimen from Oman under 3D micro-tomography.
Authors: Pinto, André Jorge1 (AUTHOR) andrejor@ucm.es, Álvarez-Lloret, Pedro2 (AUTHOR) pedroalvarez@uniovi.es, Callegari, Ivan3 (AUTHOR) ivan.callegari@gutech.edu.om, Scharf, Andreas4 (AUTHOR) scharfa@squ.edu.om
Source: Facies. Jul2025, Vol. 71 Issue 3, p1-12. 12p.
Subject Terms: *Ediacaran fossils, *Morphology, *Three-dimensional imaging, *Phylogeny, *Fossils, *Trace fossils, *Taxonomy
Geographic Terms: Oman
Abstract: Palaeopascichnus is an Ediacaran organism, whose phylogenetic affiliation and functional anatomy are both shrouded in mystery. Different studies and assessments have interpreted this fossil as macrophytes or foraminifera-like protists. Currently ongoing discussions concerns the possible phylogenetic relation between Palaeopascichnus and modern xenophyophores; benthic organisms that built agglutinated tests. We present micro-XRD, SEM-EDS and three-dimensional microtomographic data on a possible Palaeopascichnus specimen from the Ediacaran Fara Formation, in Wadi Bani Awf, Jabal Akhdar, Oman. The unique preservation of this specimen as a full positive epirelief of drusy calcite growths represents a new taphotype for this organism, enabling a more accurate observation of chamber structure and better morphological characterization. The data gathered concerning both chamber´s dimensions and morphology does not point towards an affiliation with any known Paleopascichnus species, except for much smaller P. jiumenensis. Therefore, it is possible that this specimen represents a new, previously unknown species. [ABSTRACT FROM AUTHOR]
Database: Energy & Power Source
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  Label: Title
  Group: Ti
  Data: An Ediacaran trace-like body fossil of a Palaeopascichnus specimen from Oman under 3D micro-tomography.
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  Label: Authors
  Group: Au
  Data: <searchLink fieldCode="AR" term="%22Pinto%2C+André+Jorge%22">Pinto, André Jorge</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> andrejor@ucm.es</i><br /><searchLink fieldCode="AR" term="%22Álvarez-Lloret%2C+Pedro%22">Álvarez-Lloret, Pedro</searchLink><relatesTo>2</relatesTo> (AUTHOR)<i> pedroalvarez@uniovi.es</i><br /><searchLink fieldCode="AR" term="%22Callegari%2C+Ivan%22">Callegari, Ivan</searchLink><relatesTo>3</relatesTo> (AUTHOR)<i> ivan.callegari@gutech.edu.om</i><br /><searchLink fieldCode="AR" term="%22Scharf%2C+Andreas%22">Scharf, Andreas</searchLink><relatesTo>4</relatesTo> (AUTHOR)<i> scharfa@squ.edu.om</i>
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  Data: <searchLink fieldCode="JN" term="%22Facies%22">Facies</searchLink>. Jul2025, Vol. 71 Issue 3, p1-12. 12p.
– Name: Subject
  Label: Subject Terms
  Group: Su
  Data: *<searchLink fieldCode="DE" term="%22Ediacaran+fossils%22">Ediacaran fossils</searchLink><br />*<searchLink fieldCode="DE" term="%22Morphology%22">Morphology</searchLink><br />*<searchLink fieldCode="DE" term="%22Three-dimensional+imaging%22">Three-dimensional imaging</searchLink><br />*<searchLink fieldCode="DE" term="%22Phylogeny%22">Phylogeny</searchLink><br />*<searchLink fieldCode="DE" term="%22Fossils%22">Fossils</searchLink><br />*<searchLink fieldCode="DE" term="%22Trace+fossils%22">Trace fossils</searchLink><br />*<searchLink fieldCode="DE" term="%22Taxonomy%22">Taxonomy</searchLink>
– Name: SubjectGeographic
  Label: Geographic Terms
  Group: Su
  Data: <searchLink fieldCode="DE" term="%22Oman%22">Oman</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Palaeopascichnus is an Ediacaran organism, whose phylogenetic affiliation and functional anatomy are both shrouded in mystery. Different studies and assessments have interpreted this fossil as macrophytes or foraminifera-like protists. Currently ongoing discussions concerns the possible phylogenetic relation between Palaeopascichnus and modern xenophyophores; benthic organisms that built agglutinated tests. We present micro-XRD, SEM-EDS and three-dimensional microtomographic data on a possible Palaeopascichnus specimen from the Ediacaran Fara Formation, in Wadi Bani Awf, Jabal Akhdar, Oman. The unique preservation of this specimen as a full positive epirelief of drusy calcite growths represents a new taphotype for this organism, enabling a more accurate observation of chamber structure and better morphological characterization. The data gathered concerning both chamber´s dimensions and morphology does not point towards an affiliation with any known Paleopascichnus species, except for much smaller P. jiumenensis. Therefore, it is possible that this specimen represents a new, previously unknown species. [ABSTRACT FROM AUTHOR]
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RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1007/s10347-025-00705-5
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 12
        StartPage: 1
    Subjects:
      – SubjectFull: Ediacaran fossils
        Type: general
      – SubjectFull: Morphology
        Type: general
      – SubjectFull: Three-dimensional imaging
        Type: general
      – SubjectFull: Phylogeny
        Type: general
      – SubjectFull: Fossils
        Type: general
      – SubjectFull: Trace fossils
        Type: general
      – SubjectFull: Taxonomy
        Type: general
      – SubjectFull: Oman
        Type: general
    Titles:
      – TitleFull: An Ediacaran trace-like body fossil of a Palaeopascichnus specimen from Oman under 3D micro-tomography.
        Type: main
  BibRelationships:
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      – PersonEntity:
          Name:
            NameFull: Pinto, André Jorge
      – PersonEntity:
          Name:
            NameFull: Álvarez-Lloret, Pedro
      – PersonEntity:
          Name:
            NameFull: Callegari, Ivan
      – PersonEntity:
          Name:
            NameFull: Scharf, Andreas
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          Dates:
            – D: 01
              M: 07
              Text: Jul2025
              Type: published
              Y: 2025
          Identifiers:
            – Type: issn-print
              Value: 01729179
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              Value: 71
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              Value: 3
          Titles:
            – TitleFull: Facies
              Type: main
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