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New insights into the origins and radiation of the mid-Palaeozoic Gondwanan stem tetrapods

Published online by Cambridge University Press:  29 November 2018

John A. LONG ,
Alice M. CLEMENT  and
Brian CHOO
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Abstract

The earliest tetrapodomorph fishes appear in Chinese deposits of Early Devonian age, and by the Middle Devonian they were widespread globally. Evidence for the earliest digitated tetrapods comes from largely uncontested Middle Devonian trackways and Late Devonian body fossils. The East Gondwana Provence (Australasia, Antarctica) fills vital gaps in the phylogenetic and biogeographic history of the tetrapods, with the Gondwanan clade Canowindididae exhibiting a high degree of endemism within the early part of the stem tetrapod radiation. New anatomical details of Koharalepis, from the Middle Devonian Aztec Siltstone of Antarctica, are elucidated from synchrotron scan data. These include the position of the orbit, the condition of the hyomandibular, the shape of the palate and arrangement of the vomerine fangs. Biogeographical and phylogenetic models of stem tetrapod origins and radiations are discussed.

Keywords

canowindridDevonianEast GondwanaosteolepididrhizodontTetrapodomorpha
Type
Articles
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Earth and Environmental Science Transactions of The Royal Society of Edinburgh , Volume 109 , Issue 1-2: Fossils, Function and Phylogeny: Papers on Early Vertebrate Evolution in Honour of Professor Jennifer A. Clack , March 2018 , pp. 139 - 155
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Copyright © The Royal Society of Edinburgh 2018 

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