Non-tetrapod sarcopterygians from the Valentia Slate Formation (Givetian, Devonian) of the Iveragh Peninsula, south-western Ireland: systematic reappraisal and palaeobiogeographic implications

Vincent Dupret; Hannah Byrne; Tom Challands; Øyvind Hammer; Kenneth Higgs; John Long; Grzegorz Niedźwiedzki; Martin Qvarnström; Iwan Stössel; Per E. Ahlberg

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Non-tetrapod sarcopterygians from the Valentia Slate Formation (Givetian, Devonian) of the Iveragh Peninsula, south-western Ireland: systematic reappraisal and palaeobiogeographic implications

Dupret, Vincent ^[1] ; Byrne, Hannah ^[2] ; Challands, Tom ^[3] ; Hammer, Øyvind ^[4] ; Higgs, Kenneth ^[5] ; Long, John ^[6] ; Niedźwiedzki, Grzegorz ^[2] ; Qvarnström, Martin ^[2] ; Stössel, Iwan ^[7] ; Ahlberg, Per Erik ^[2]
1. [1] Universitat de València
  
  Universitat de València
  
  Valencia, España
2. [2] Uppsala University
  
  Uppsala University
  
  Uppsala domkyrkoförs., Suecia
3. [3] University of Edinburgh
  
  University of Edinburgh
  
  Reino Unido
4. [4] University of Oslo
  
  University of Oslo
  
  Noruega
5. [5] University College Cork
  
  University College Cork
  
  Irlanda
6. [6] Flinders University
  
  Flinders University
  
  Australia
7. [7] ETH Zürich
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Localización: Spanish journal of palaeontology, ISSN 2255-0550, Vol. 38, Nº. 1, 2023 (Ejemplar dedicado a: SPANISH JOURNAL OF PALAEONTOLOGY), págs. 37-45
Idioma: inglés
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Resumen
- The Middle Devonian (Givetian) Valentia Slate Formation in the Iveragh Peninsula, southwest Ireland, is more renowned for the second oldest record of tetrapod trackways in the world than for its heavily metamorphosed bone remains. The present study focuses on new discoveries of non-tetrapod sarcopterygian fish fossils from the Valentia Slate Formation. Micro-CT scanning technology allows a re-interpretation of a previously published acanthodian fin spine as a fanged coronoid of a probable Rhizodontida and the identification of a Dipnoi tooth plate and bone. In addition, a scale of Holoptychius is described. The presence the rhizodont suggests Gondwanan ties and a first northward dispersal wave of these vertebrates into Euramerica as early as middle Givetian. This hypothesis is supported by the common occurrence of the placoderm Bothriolepis in the Valentia Slate Formation.