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Phylogenetic and environmental context of a Tournaisian tetrapod fauna

Phylogenetic and environmental context of a Tournaisian tetrapod fauna
Phylogenetic and environmental context of a Tournaisian tetrapod fauna
The end-Devonian to mid-Mississippian time interval has long been known for its depauperate palaeontological record, especially for tetrapods. This interval encapsulates the time of increasing terrestriality among tetrapods, but only two Tournaisian localities previously produced tetrapod fossils. Here we describe five new Tournaisian tetrapods (Perittodus apsconditus, Koilops herma, Ossirarus kierani, Diploradus austiumensis and Aytonerpeton microps) from two localities in their environmental context. A phylogenetic analysis retrieved three taxa as stem tetrapods, interspersed among Devonian and Carboniferous forms, and two as stem amphibians, suggesting a deep split among crown tetrapods. We also illustrate new tetrapod specimens from these and additional localities in the Scottish Borders region. The new taxa and specimens suggest that tetrapod diversification was well established by the Tournaisian. Sedimentary evidence indicates that the tetrapod fossils are usually associated with sandy siltstones overlying wetland palaeosols. Tetrapods were probably living on vegetated surfaces that were subsequently flooded. We show that atmospheric oxygen levels were stable across the Devonian/Carboniferous boundary, and did not inhibit the evolution of terrestriality. This wealth of tetrapods from Tournaisian localities highlights the potential for discoveries elsewhere.
Clack, Jennifer A.
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Bennett, Carys E.
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Carpenter, David K.
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Davies, Sarah J.
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Fraser, Nicholas C.
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Kearsey, Timothy I.
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Marshall, John E.A.
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Millward, David
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Otoo, Benjamin K. A.
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Reeves, Emma J.
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Ross, Andrew J.
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Ruta, Marcello
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Smithson, Keturah Z.
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Smithson, Timothy R.
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Walsh, Stig A.
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Clack, Jennifer A.
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Bennett, Carys E.
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Carpenter, David K.
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Davies, Sarah J.
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Fraser, Nicholas C.
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Kearsey, Timothy I.
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Marshall, John E.A.
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Millward, David
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Otoo, Benjamin K. A.
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Reeves, Emma J.
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Ross, Andrew J.
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Ruta, Marcello
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Smithson, Keturah Z.
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Smithson, Timothy R.
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Walsh, Stig A.
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Clack, Jennifer A., Bennett, Carys E., Carpenter, David K., Davies, Sarah J., Fraser, Nicholas C., Kearsey, Timothy I., Marshall, John E.A., Millward, David, Otoo, Benjamin K. A., Reeves, Emma J., Ross, Andrew J., Ruta, Marcello, Smithson, Keturah Z., Smithson, Timothy R. and Walsh, Stig A. (2017) Phylogenetic and environmental context of a Tournaisian tetrapod fauna. Nature Ecology & Evolution, 1 (1), [0002]. (doi:10.1038/s41559-016-0002).

Record type: Article

Abstract

The end-Devonian to mid-Mississippian time interval has long been known for its depauperate palaeontological record, especially for tetrapods. This interval encapsulates the time of increasing terrestriality among tetrapods, but only two Tournaisian localities previously produced tetrapod fossils. Here we describe five new Tournaisian tetrapods (Perittodus apsconditus, Koilops herma, Ossirarus kierani, Diploradus austiumensis and Aytonerpeton microps) from two localities in their environmental context. A phylogenetic analysis retrieved three taxa as stem tetrapods, interspersed among Devonian and Carboniferous forms, and two as stem amphibians, suggesting a deep split among crown tetrapods. We also illustrate new tetrapod specimens from these and additional localities in the Scottish Borders region. The new taxa and specimens suggest that tetrapod diversification was well established by the Tournaisian. Sedimentary evidence indicates that the tetrapod fossils are usually associated with sandy siltstones overlying wetland palaeosols. Tetrapods were probably living on vegetated surfaces that were subsequently flooded. We show that atmospheric oxygen levels were stable across the Devonian/Carboniferous boundary, and did not inhibit the evolution of terrestriality. This wealth of tetrapods from Tournaisian localities highlights the potential for discoveries elsewhere.

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Clack et al. Tournaisian tetrapods.pdf - Accepted Manuscript
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Accepted/In Press date: 11 October 2016
e-pub ahead of print date: 5 December 2016
Published date: January 2017
Organisations: Ocean and Earth Science

Identifiers

Local EPrints ID: 404680
URI: http://eprints.soton.ac.uk/id/eprint/404680
PURE UUID: 4016174d-7a3d-4ab7-8836-295962257b56
ORCID for John E.A. Marshall: ORCID iD orcid.org/0000-0002-9242-3646

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Date deposited: 13 Jan 2017 14:33
Last modified: 12 Dec 2021 06:37

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Contributors

Author: Jennifer A. Clack
Author: Carys E. Bennett
Author: David K. Carpenter
Author: Sarah J. Davies
Author: Nicholas C. Fraser
Author: Timothy I. Kearsey
Author: David Millward
Author: Benjamin K. A. Otoo
Author: Emma J. Reeves
Author: Andrew J. Ross
Author: Marcello Ruta
Author: Keturah Z. Smithson
Author: Timothy R. Smithson
Author: Stig A. Walsh

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