Ultimate Eocene (Priabonian) Chondrichthyans (Holocephali, Elasmobranchii) of Antarctica
The Eocene La Meseta Formation on Seymour Island, Antarctic Peninsula, is known for its remarkable wealth of fossil remains of chondrichthyans and teleosts. Chondrichthyans seemingly were dominant elements in the Antarctic Paleogene fish fauna, but decreased in abundance from middle to late Eocene,...
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ftpubmed:oai:pubmedcentral.nih.gov:5346486 2023-05-15T13:54:57+02:00 Ultimate Eocene (Priabonian) Chondrichthyans (Holocephali, Elasmobranchii) of Antarctica Kriwet, Jürgen Engelbrecht, Andrea Mörs, Thomas Reguero, Marcelo Pfaff, Cathrin 2016-04-12 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5346486/ http://www.ncbi.nlm.nih.gov/pubmed/28298806 https://doi.org/10.1080/02724634.2016.1160911 en eng http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5346486/ http://www.ncbi.nlm.nih.gov/pubmed/28298806 http://dx.doi.org/10.1080/02724634.2016.1160911 Article Text 2016 ftpubmed https://doi.org/10.1080/02724634.2016.1160911 2017-04-16T00:00:27Z The Eocene La Meseta Formation on Seymour Island, Antarctic Peninsula, is known for its remarkable wealth of fossil remains of chondrichthyans and teleosts. Chondrichthyans seemingly were dominant elements in the Antarctic Paleogene fish fauna, but decreased in abundance from middle to late Eocene, during which time remains of bony fishes increase. This decline of chondrichthyans at the end of the Eocene generally is related to sudden cooling of seawater, reduction in shelf area, and increasing shelf depth due to the onset of the Antarctic thermal isolation. The last chondrichthyan records known so far include a chimeroid tooth plate from TELM 6 (Lutetian) and a single pristiophorid rostral spine from TELM 7 (Priabonian). Here, we present new chondrichthyan records of Squalus, Squatina, Pristiophorus, Striatolamia, Palaeohypotodus, Carcharocles, and Ischyodus from the upper parts of TELM 7 (Priabonian), including the first record of Carcharocles sokolovi from Antarctica. This assemblage suggests that chondrichthyans persisted much longer in Antarctic waters despite rather cool sea surface temperatures of approximately 5°C. The final disappearance of chondrichthyans at the Eocene–Oligocene boundary concurs with abrupt ice sheet formation in Antarctica. Diversity patterns of chondrichthyans throughout the La Meseta Formation appear to be related to climatic conditions rather than plate tectonics. Text Antarc* Antarctic Antarctic Peninsula Antarctica Ice Sheet Seymour Island PubMed Central (PMC) Antarctic Antarctic Peninsula Seymour ENVELOPE(-56.767,-56.767,-64.283,-64.283) Seymour Island ENVELOPE(-56.750,-56.750,-64.283,-64.283) The Antarctic Journal of Vertebrate Paleontology 36 4 e1160911 |
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Article Kriwet, Jürgen Engelbrecht, Andrea Mörs, Thomas Reguero, Marcelo Pfaff, Cathrin Ultimate Eocene (Priabonian) Chondrichthyans (Holocephali, Elasmobranchii) of Antarctica |
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The Eocene La Meseta Formation on Seymour Island, Antarctic Peninsula, is known for its remarkable wealth of fossil remains of chondrichthyans and teleosts. Chondrichthyans seemingly were dominant elements in the Antarctic Paleogene fish fauna, but decreased in abundance from middle to late Eocene, during which time remains of bony fishes increase. This decline of chondrichthyans at the end of the Eocene generally is related to sudden cooling of seawater, reduction in shelf area, and increasing shelf depth due to the onset of the Antarctic thermal isolation. The last chondrichthyan records known so far include a chimeroid tooth plate from TELM 6 (Lutetian) and a single pristiophorid rostral spine from TELM 7 (Priabonian). Here, we present new chondrichthyan records of Squalus, Squatina, Pristiophorus, Striatolamia, Palaeohypotodus, Carcharocles, and Ischyodus from the upper parts of TELM 7 (Priabonian), including the first record of Carcharocles sokolovi from Antarctica. This assemblage suggests that chondrichthyans persisted much longer in Antarctic waters despite rather cool sea surface temperatures of approximately 5°C. The final disappearance of chondrichthyans at the Eocene–Oligocene boundary concurs with abrupt ice sheet formation in Antarctica. Diversity patterns of chondrichthyans throughout the La Meseta Formation appear to be related to climatic conditions rather than plate tectonics. |
format |
Text |
author |
Kriwet, Jürgen Engelbrecht, Andrea Mörs, Thomas Reguero, Marcelo Pfaff, Cathrin |
author_facet |
Kriwet, Jürgen Engelbrecht, Andrea Mörs, Thomas Reguero, Marcelo Pfaff, Cathrin |
author_sort |
Kriwet, Jürgen |
title |
Ultimate Eocene (Priabonian) Chondrichthyans (Holocephali, Elasmobranchii) of Antarctica |
title_short |
Ultimate Eocene (Priabonian) Chondrichthyans (Holocephali, Elasmobranchii) of Antarctica |
title_full |
Ultimate Eocene (Priabonian) Chondrichthyans (Holocephali, Elasmobranchii) of Antarctica |
title_fullStr |
Ultimate Eocene (Priabonian) Chondrichthyans (Holocephali, Elasmobranchii) of Antarctica |
title_full_unstemmed |
Ultimate Eocene (Priabonian) Chondrichthyans (Holocephali, Elasmobranchii) of Antarctica |
title_sort |
ultimate eocene (priabonian) chondrichthyans (holocephali, elasmobranchii) of antarctica |
publishDate |
2016 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5346486/ http://www.ncbi.nlm.nih.gov/pubmed/28298806 https://doi.org/10.1080/02724634.2016.1160911 |
long_lat |
ENVELOPE(-56.767,-56.767,-64.283,-64.283) ENVELOPE(-56.750,-56.750,-64.283,-64.283) |
geographic |
Antarctic Antarctic Peninsula Seymour Seymour Island The Antarctic |
geographic_facet |
Antarctic Antarctic Peninsula Seymour Seymour Island The Antarctic |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica Ice Sheet Seymour Island |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica Ice Sheet Seymour Island |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5346486/ http://www.ncbi.nlm.nih.gov/pubmed/28298806 http://dx.doi.org/10.1080/02724634.2016.1160911 |
op_doi |
https://doi.org/10.1080/02724634.2016.1160911 |
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Journal of Vertebrate Paleontology |
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36 |
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4 |
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e1160911 |
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1766261153783087104 |