The internal cranial anatomy of Romundina stellina Orvig, 1975 (Vertebrata, Placodermi, Acanthothoraci) and the origin of jawed vertebrates-Anatomical atlas of a primitive gnathostome
Placoderms are considered as the first jawed vertebrates and constitute a paraphyletic group in the stem-gnathostome grade. The acanthothoracid placoderms are among the phylogenetically most basal and morphologically primitive gnathostomes, but their neurocranial anatomy is poorly understood. Here w...
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ftanucanberra:oai:openresearch-repository.anu.edu.au:1885/204865 2024-01-14T10:03:22+01:00 The internal cranial anatomy of Romundina stellina Orvig, 1975 (Vertebrata, Placodermi, Acanthothoraci) and the origin of jawed vertebrates-Anatomical atlas of a primitive gnathostome Dupret, Vincent Sanchez, Sophie Goujet, Daniel Ahlberg, Per 47 pages application/pdf http://hdl.handle.net/1885/204865 https://doi.org/10.1371/journal.pone.0171241 https://openresearch-repository.anu.edu.au/bitstream/1885/204865/5/01_Dupret_The_internal_cranial_anatomy_2017.pdf.jpg en_AU eng Public Library of Science 1932-6203 http://hdl.handle.net/1885/204865 doi:10.1371/journal.pone.0171241 https://openresearch-repository.anu.edu.au/bitstream/1885/204865/5/01_Dupret_The_internal_cranial_anatomy_2017.pdf.jpg © 2017 Dupret et al. https://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. PLOS ONE (Public Library of Science) Journal article ftanucanberra https://doi.org/10.1371/journal.pone.0171241 2023-12-15T09:36:09Z Placoderms are considered as the first jawed vertebrates and constitute a paraphyletic group in the stem-gnathostome grade. The acanthothoracid placoderms are among the phylogenetically most basal and morphologically primitive gnathostomes, but their neurocranial anatomy is poorly understood. Here we present a near-complete three-dimensional skull of Romundina stellina, a small Early Devonian acanthothoracid from the Canadian Arctic Archipelago, scanned with propagation phase contrast microtomography at a 7.46 mu m isotropic voxel size at the European Synchrotron Radiation Facility, Grenoble, France. This is the first model of an early gnathostome skull produced using this technique, and as such represents a major advance in objectivity compared to past descriptions of placoderm neurocrania on the basis of grinding series. Despite some loss of material along an oblique crack, most of the internal structures are remarkably preserved, and most of the missing structures can be reconstructed by symmetry. This virtual approach offers the possibility to connect with certainty all the external foramina to the blood and nerve canals and the central structures, and thus identify accurate homologies without destroying the specimen. The high level of detail enables description of the main arterial, venous and nerve canals of the skull, and other perichondrally ossified endocranial structures such as the palatoquadrate articulations, the endocranial cavity and the inner ear cavities. The braincase morphology appears less extreme than that of Brindabellaspis, and is in some respects more reminiscent of a basal arthrodire such as Kujdanowiaspis. This work was funded by European Research Council Advanced Investigator Grant 233111 (https://erc.europa.eu/)-funding only; Wallenberg Scholarship from the Knut and Alice Wallenberg Foundation (https://www.wallenberg. com/)-funding only; and ESRF (https://www.esrf. eu)-data collection (microtromography). The Museum National d’Histoire Naturelle provided support in the form of ... Article in Journal/Newspaper Arctic Archipelago Arctic Canadian Arctic Archipelago Australian National University: ANU Digital Collections Arctic Canadian Arctic Archipelago PLOS ONE 12 2 e0171241 |
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Open Polar |
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Australian National University: ANU Digital Collections |
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ftanucanberra |
language |
English |
description |
Placoderms are considered as the first jawed vertebrates and constitute a paraphyletic group in the stem-gnathostome grade. The acanthothoracid placoderms are among the phylogenetically most basal and morphologically primitive gnathostomes, but their neurocranial anatomy is poorly understood. Here we present a near-complete three-dimensional skull of Romundina stellina, a small Early Devonian acanthothoracid from the Canadian Arctic Archipelago, scanned with propagation phase contrast microtomography at a 7.46 mu m isotropic voxel size at the European Synchrotron Radiation Facility, Grenoble, France. This is the first model of an early gnathostome skull produced using this technique, and as such represents a major advance in objectivity compared to past descriptions of placoderm neurocrania on the basis of grinding series. Despite some loss of material along an oblique crack, most of the internal structures are remarkably preserved, and most of the missing structures can be reconstructed by symmetry. This virtual approach offers the possibility to connect with certainty all the external foramina to the blood and nerve canals and the central structures, and thus identify accurate homologies without destroying the specimen. The high level of detail enables description of the main arterial, venous and nerve canals of the skull, and other perichondrally ossified endocranial structures such as the palatoquadrate articulations, the endocranial cavity and the inner ear cavities. The braincase morphology appears less extreme than that of Brindabellaspis, and is in some respects more reminiscent of a basal arthrodire such as Kujdanowiaspis. This work was funded by European Research Council Advanced Investigator Grant 233111 (https://erc.europa.eu/)-funding only; Wallenberg Scholarship from the Knut and Alice Wallenberg Foundation (https://www.wallenberg. com/)-funding only; and ESRF (https://www.esrf. eu)-data collection (microtromography). The Museum National d’Histoire Naturelle provided support in the form of ... |
format |
Article in Journal/Newspaper |
author |
Dupret, Vincent Sanchez, Sophie Goujet, Daniel Ahlberg, Per |
spellingShingle |
Dupret, Vincent Sanchez, Sophie Goujet, Daniel Ahlberg, Per The internal cranial anatomy of Romundina stellina Orvig, 1975 (Vertebrata, Placodermi, Acanthothoraci) and the origin of jawed vertebrates-Anatomical atlas of a primitive gnathostome |
author_facet |
Dupret, Vincent Sanchez, Sophie Goujet, Daniel Ahlberg, Per |
author_sort |
Dupret, Vincent |
title |
The internal cranial anatomy of Romundina stellina Orvig, 1975 (Vertebrata, Placodermi, Acanthothoraci) and the origin of jawed vertebrates-Anatomical atlas of a primitive gnathostome |
title_short |
The internal cranial anatomy of Romundina stellina Orvig, 1975 (Vertebrata, Placodermi, Acanthothoraci) and the origin of jawed vertebrates-Anatomical atlas of a primitive gnathostome |
title_full |
The internal cranial anatomy of Romundina stellina Orvig, 1975 (Vertebrata, Placodermi, Acanthothoraci) and the origin of jawed vertebrates-Anatomical atlas of a primitive gnathostome |
title_fullStr |
The internal cranial anatomy of Romundina stellina Orvig, 1975 (Vertebrata, Placodermi, Acanthothoraci) and the origin of jawed vertebrates-Anatomical atlas of a primitive gnathostome |
title_full_unstemmed |
The internal cranial anatomy of Romundina stellina Orvig, 1975 (Vertebrata, Placodermi, Acanthothoraci) and the origin of jawed vertebrates-Anatomical atlas of a primitive gnathostome |
title_sort |
internal cranial anatomy of romundina stellina orvig, 1975 (vertebrata, placodermi, acanthothoraci) and the origin of jawed vertebrates-anatomical atlas of a primitive gnathostome |
publisher |
Public Library of Science |
url |
http://hdl.handle.net/1885/204865 https://doi.org/10.1371/journal.pone.0171241 https://openresearch-repository.anu.edu.au/bitstream/1885/204865/5/01_Dupret_The_internal_cranial_anatomy_2017.pdf.jpg |
geographic |
Arctic Canadian Arctic Archipelago |
geographic_facet |
Arctic Canadian Arctic Archipelago |
genre |
Arctic Archipelago Arctic Canadian Arctic Archipelago |
genre_facet |
Arctic Archipelago Arctic Canadian Arctic Archipelago |
op_source |
PLOS ONE (Public Library of Science) |
op_relation |
1932-6203 http://hdl.handle.net/1885/204865 doi:10.1371/journal.pone.0171241 https://openresearch-repository.anu.edu.au/bitstream/1885/204865/5/01_Dupret_The_internal_cranial_anatomy_2017.pdf.jpg |
op_rights |
© 2017 Dupret et al. https://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. |
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https://doi.org/10.1371/journal.pone.0171241 |
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PLOS ONE |
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e0171241 |
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