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Two newly identified cheiracanthid acanthodians from the Mey Flagstone Formation (Givetian, Middle Devonian) of the Orcadian Basin, Scotland

View ORCID ProfileMichael J. Newman, Jan L. den Blaauwen and Carole J. Burrow
Scottish Journal of Geology, 57, sjg2020-009, 9 November 2020, https://doi.org/10.1144/sjg2020-009
Michael J. Newman
1Vine Lodge, Vine Road, Johnston, Haverfordwest, , UK
Roles: [Conceptualization (Equal)], [Investigation (Equal)], [Writing - Original Draft (Equal)], [Writing - Review & Editing (Equal)]
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  • For correspondence: ichthyman@btinternet.com
Jan L. den Blaauwen
2University of Amsterdam, Science Park 904, , , The Netherlands
Roles: [Conceptualization (Equal)], [Data curation (Lead)], [Formal analysis (Equal)], [Investigation (Equal)], [Writing - Original Draft (Supporting)], [Writing - Review & Editing (Supporting)]
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Carole J. Burrow
3Geosciences, Queensland Museum, 122 Gerler Road, Hendra 4011, , Australia
Roles: [Conceptualization (Equal)], [Data curation (Supporting)], [Formal analysis (Equal)], [Investigation (Equal)], [Writing - Original Draft (Equal)], [Writing - Review & Editing (Equal)]
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Abstract

Articulated cheiracanthid acanthodians are relatively rare above the Dickosteus thrieplandi biostratigraphic zone in the Orcadian Basin, with Cheiracanthus peachi den Blaauwen, Newman & Burrow the only species identified to date. Here we describe two other taxa Fallodentus davidsoni nov. gen. et sp. and Markacanthus costulatus Valiukevičius from the Mey Flagstone Formation. F. davidsoni occurs at the base of the formation, in the Osteolepis panderi biostratigraphic zone, and is readily identified by its robust fin spines which have a wide longitudinal ridge on each side below the groove separating the leading edge from the side of the spine. The taxon is most similar to Homalacanthus concinnus (Whiteaves) from the younger (Frasnian) Escuminac Formation in Quebec, Canada. The unique specimen of Markacanthus costulatus is from the top of the Mey Flagstone Formation. This taxon was previously only known from isolated scales from the upper Narva and Aruküla Regional Stages of the east Baltic region. The dorsoventral preservation of the head region in the F. davidsoni specimens reveals clearly the position of the ceratohyal cartilages in a cheiracanthid, as well as showing for the first time that there is a basihyal cartilage anterior to the ceratohyals.

  • © 2020 The Author(s). Published by The Geological Society of London for EGS and GSG. All rights reserved
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Scottish Journal of Geology: 57 (1)
Scottish Journal of Geology
Volume 57, Issue 1
May 2021
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Two newly identified cheiracanthid acanthodians from the Mey Flagstone Formation (Givetian, Middle Devonian) of the Orcadian Basin, Scotland

Michael J. Newman, Jan L. den Blaauwen and Carole J. Burrow
Scottish Journal of Geology, 57, sjg2020-009, 9 November 2020, https://doi.org/10.1144/sjg2020-009
Michael J. Newman
1Vine Lodge, Vine Road, Johnston, Haverfordwest, , UK
Roles: [Conceptualization (Equal)], [Investigation (Equal)], [Writing - Original Draft (Equal)], [Writing - Review & Editing (Equal)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • ORCID record for Michael J. Newman
  • For correspondence: ichthyman@btinternet.com
Jan L. den Blaauwen
2University of Amsterdam, Science Park 904, , , The Netherlands
Roles: [Conceptualization (Equal)], [Data curation (Lead)], [Formal analysis (Equal)], [Investigation (Equal)], [Writing - Original Draft (Supporting)], [Writing - Review & Editing (Supporting)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
Carole J. Burrow
3Geosciences, Queensland Museum, 122 Gerler Road, Hendra 4011, , Australia
Roles: [Conceptualization (Equal)], [Data curation (Supporting)], [Formal analysis (Equal)], [Investigation (Equal)], [Writing - Original Draft (Equal)], [Writing - Review & Editing (Equal)]
  • Find this author on Google Scholar
  • Find this author on PubMed
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Two newly identified cheiracanthid acanthodians from the Mey Flagstone Formation (Givetian, Middle Devonian) of the Orcadian Basin, Scotland

Michael J. Newman, Jan L. den Blaauwen and Carole J. Burrow
Scottish Journal of Geology, 57, sjg2020-009, 9 November 2020, https://doi.org/10.1144/sjg2020-009
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