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Phylogenetic and environmental context of a Tournaisian tetrapod fauna

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posted on 2018-01-17, 13:31 authored by Jennifer A. Clack, Carys E. Bennett, David K. Carpenter, Sarah J. Davies, Nicholas C. Fraser, Timothy I. Kearsey, John E. A. Marshall, David Millward, Benjamin K. A. Otoo, Emma J. Reeves, Andrew J. Ross, Marcello Ruta, Keturah Z. Smithson, Timothy R. Smithson, Stig A. Walsh
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.

History

Citation

Nature Ecology & Evolution, 2016, 1 (1), pp. 0002-0002

Author affiliation

/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Geology

Version

  • AM (Accepted Manuscript)

Published in

Nature Ecology & Evolution

Publisher

Nature Publishing Group

eissn

2397-334X

Acceptance date

2016-10-11

Copyright date

2016

Available date

2018-01-17

Publisher version

https://www.nature.com/articles/s41559-016-0002

Language

en

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