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The internal cranial anatomy of Romundina stellina Orvig, 1975 (Vertebrata, Placodermi, Acanthothoraci) and the origin of jawed vertebrates: Anatomical atlas of a primitive gnathostome
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology, Evolution and Developmental Biology. Uppsala University, Science for Life Laboratory, SciLifeLab. Australian Natl Univ, Dept Appl Math, Res Sch Phys & Engn, Canberra, ACT, Australia..ORCID iD: 0000-0002-6859-1041
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology, Evolution and Developmental Biology. Uppsala University, Science for Life Laboratory, SciLifeLab. European Synchrotron Radiat Facil, Grenoble, France..
UPMC Paris 6, CNRS, MNHN, CR2P UMR 7207,Sorbonne Univ,Museum Natl Hist Nat, Paris, France..
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology, Evolution and Developmental Biology. Uppsala University, Science for Life Laboratory, SciLifeLab.
2017 (English)In: PLoS ONE, ISSN 1932-6203, E-ISSN 1932-6203, Vol. 12, no 2, e0171241Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2017. Vol. 12, no 2, e0171241
National Category
Developmental Biology
Identifiers
URN: urn:nbn:se:uu:diva-317951DOI: 10.1371/journal.pone.0171241ISI: 000393705500025PubMedID: 28170434OAI: oai:DiVA.org:uu-317951DiVA: diva2:1086336
Available from: 2017-04-01 Created: 2017-04-01 Last updated: 2017-04-01Bibliographically approved

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Dupret, VincentSanchez, SophieAhlberg, Per Erik
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