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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Uppsala universitet, Evolution och utvecklingsbiologi
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ftuppsalauniv:oai:DiVA.org:uu-317951 2023-05-15T14:28:54+02:00 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 Erik 2017 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-317951 https://doi.org/10.1371/journal.pone.0171241 eng eng Uppsala universitet, Evolution och utvecklingsbiologi Uppsala universitet, Science for Life Laboratory, SciLifeLab Australian Natl Univ, Dept Appl Math, Res Sch Phys & Engn, Canberra, ACT, Australia. European Synchrotron Radiat Facil, Grenoble, France. UPMC Paris 6, CNRS, MNHN, CR2P UMR 7207,Sorbonne Univ,Museum Natl Hist Nat, Paris, France. PLOS ONE, 2017, 12:2, http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-317951 doi:10.1371/journal.pone.0171241 PMID 28170434 ISI:000393705500025 info:eu-repo/semantics/openAccess Developmental Biology Utvecklingsbiologi Article in journal info:eu-repo/semantics/article text 2017 ftuppsalauniv https://doi.org/10.1371/journal.pone.0171241 2023-02-23T21:55:52Z 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. Article in Journal/Newspaper Arctic Archipelago Arctic Canadian Arctic Archipelago Uppsala University: Publications (DiVA) Arctic Canadian Arctic Archipelago PLOS ONE 12 2 e0171241 |
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Uppsala University: Publications (DiVA) |
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ftuppsalauniv |
language |
English |
topic |
Developmental Biology Utvecklingsbiologi |
spellingShingle |
Developmental Biology Utvecklingsbiologi Dupret, Vincent Sanchez, Sophie Goujet, Daniel Ahlberg, Per Erik The internal cranial anatomy of Romundina stellina Orvig, 1975 (Vertebrata, Placodermi, Acanthothoraci) and the origin of jawed vertebrates : Anatomical atlas of a primitive gnathostome |
topic_facet |
Developmental Biology Utvecklingsbiologi |
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. |
format |
Article in Journal/Newspaper |
author |
Dupret, Vincent Sanchez, Sophie Goujet, Daniel Ahlberg, Per Erik |
author_facet |
Dupret, Vincent Sanchez, Sophie Goujet, Daniel Ahlberg, Per Erik |
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 |
Uppsala universitet, Evolution och utvecklingsbiologi |
publishDate |
2017 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-317951 https://doi.org/10.1371/journal.pone.0171241 |
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_relation |
PLOS ONE, 2017, 12:2, http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-317951 doi:10.1371/journal.pone.0171241 PMID 28170434 ISI:000393705500025 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1371/journal.pone.0171241 |
container_title |
PLOS ONE |
container_volume |
12 |
container_issue |
2 |
container_start_page |
e0171241 |
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1766303040839614464 |