The last dicynodont? Re-assessing the taxonomic and temporal relationships of a contentious Australian fossil

Knutsen, Espen M., and Oerlemans, Emma (2020) The last dicynodont? Re-assessing the taxonomic and temporal relationships of a contentious Australian fossil. Gondwana Research, 77. pp. 184-203.

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Abstract

Dicynodonts, a lineage of non-mammalian therapsids, who's derived taxa evolved edentulous beaked jaws sporting a pair of caniniform tusks, dominated the herbivorous terrestrial vertebrate fauna for much of the Permian and Triassic periods. Long assumed to have met their demise during the end-Triassic extinction event, the discovery of a fragmentary possible dicynodont in Cretaceous rocks in Queensland Australia, potentially extended the longevity of the lineage by nearly 100 million years. This study reassesses the geological, anatomical and historical aspects of this specimen through museum archival research, detrital zircon geochronology, trace element analysis and x-ray synchrotron microtomography, and present new knowledge regarding its temporal, geographical and biological origins, supporting a late Cenozoic (Pliocene-Pleistocene) mammalian megafaunal affinity for the specimen, resulting in a lack of evidence for post-Triassic survival of dicynodonts.

Item ID: 61441
Item Type: Article (Research - C1)
ISSN: 1342-937X
Keywords: Dicynodont, Cretaceous, Australia, Synchrotron, Megafauna
Copyright Information: © 2019 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.
Date Deposited: 15 Jan 2020 07:51
FoR Codes: 04 EARTH SCIENCES > 0403 Geology > 040308 Palaeontology (incl Palynology) @ 95%
04 EARTH SCIENCES > 0403 Geology > 040303 Geochronology @ 5%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970104 Expanding Knowledge in the Earth Sciences @ 100%
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