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,...
Published in: | Journal of Vertebrate Paleontology |
---|---|
Main Authors: | , , , , |
Format: | Text |
Language: | English |
Published: |
The Society of Vertebrate Paleontology
2016
|
Subjects: | |
Online Access: | https://doi.org/10.1080/02724634.2016.1160911 |
id |
ftbioone:10.1080/02724634.2016.1160911 |
---|---|
record_format |
openpolar |
spelling |
ftbioone:10.1080/02724634.2016.1160911 2024-06-02T07:57:41+00:00 Ultimate Eocene (Priabonian) Chondrichthyans (Holocephali, Elasmobranchii) of Antarctica Jürgen Kriwet Andrea Engelbrecht Thomas Mörs Marcelo Reguero Cathrin Pfaff Jürgen Kriwet Andrea Engelbrecht Thomas Mörs Marcelo Reguero Cathrin Pfaff world 2016-07-01 text/HTML https://doi.org/10.1080/02724634.2016.1160911 en eng The Society of Vertebrate Paleontology doi:10.1080/02724634.2016.1160911 All rights reserved. https://doi.org/10.1080/02724634.2016.1160911 Text 2016 ftbioone https://doi.org/10.1080/02724634.2016.1160911 2024-05-07T00:51:19Z 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 BioOne Online Journals Antarctic The Antarctic Antarctic Peninsula Seymour ENVELOPE(-56.767,-56.767,-64.283,-64.283) Seymour Island ENVELOPE(-56.750,-56.750,-64.283,-64.283) Journal of Vertebrate Paleontology 36 4 e1160911 |
institution |
Open Polar |
collection |
BioOne Online Journals |
op_collection_id |
ftbioone |
language |
English |
description |
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. |
author2 |
Jürgen Kriwet Andrea Engelbrecht Thomas Mörs Marcelo Reguero Cathrin Pfaff |
format |
Text |
author |
Jürgen Kriwet Andrea Engelbrecht Thomas Mörs Marcelo Reguero Cathrin Pfaff |
spellingShingle |
Jürgen Kriwet Andrea Engelbrecht Thomas Mörs Marcelo Reguero Cathrin Pfaff Ultimate Eocene (Priabonian) Chondrichthyans (Holocephali, Elasmobranchii) of Antarctica |
author_facet |
Jürgen Kriwet Andrea Engelbrecht Thomas Mörs Marcelo Reguero Cathrin Pfaff |
author_sort |
Jürgen Kriwet |
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 |
publisher |
The Society of Vertebrate Paleontology |
publishDate |
2016 |
url |
https://doi.org/10.1080/02724634.2016.1160911 |
op_coverage |
world |
long_lat |
ENVELOPE(-56.767,-56.767,-64.283,-64.283) ENVELOPE(-56.750,-56.750,-64.283,-64.283) |
geographic |
Antarctic The Antarctic Antarctic Peninsula Seymour Seymour Island |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula Seymour Seymour Island |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica Ice Sheet Seymour Island |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica Ice Sheet Seymour Island |
op_source |
https://doi.org/10.1080/02724634.2016.1160911 |
op_relation |
doi:10.1080/02724634.2016.1160911 |
op_rights |
All rights reserved. |
op_doi |
https://doi.org/10.1080/02724634.2016.1160911 |
container_title |
Journal of Vertebrate Paleontology |
container_volume |
36 |
container_issue |
4 |
container_start_page |
e1160911 |
_version_ |
1800740879639511040 |