A New Specimen of the Hybodont Shark Palaeobates polaris with Three-Dimensionally Preserved Meckel's Cartilage from the Smithian (Early Triassic) of Spitsbergen
A new, well-preserved specimen of Palaeobates polaris from the Smithian ‘fish horizon’ of Spitsbergen (Svalbard archipelago, Arctic Norway) is presented. The find is more complete than the type material of P. polaris and contains amongst others the left mandibular branch with associated dentition an...
Published in: | Journal of Vertebrate Paleontology |
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The Society of Vertebrate Paleontology
2010
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Online Access: | https://doi.org/10.1080/02724634.2010.521962 |
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ftbioone:10.1080/02724634.2010.521962 2024-06-02T08:02:34+00:00 A New Specimen of the Hybodont Shark Palaeobates polaris with Three-Dimensionally Preserved Meckel's Cartilage from the Smithian (Early Triassic) of Spitsbergen Carlo Romano Winand Brinkmann Carlo Romano Winand Brinkmann world 2010-11-01 text/HTML https://doi.org/10.1080/02724634.2010.521962 en eng The Society of Vertebrate Paleontology doi:10.1080/02724634.2010.521962 All rights reserved. https://doi.org/10.1080/02724634.2010.521962 Text 2010 ftbioone https://doi.org/10.1080/02724634.2010.521962 2024-05-07T00:50:56Z A new, well-preserved specimen of Palaeobates polaris from the Smithian ‘fish horizon’ of Spitsbergen (Svalbard archipelago, Arctic Norway) is presented. The find is more complete than the type material of P. polaris and contains amongst others the left mandibular branch with associated dentition and labial cartilage as well as elements of the hyoid arch and a portion of the anterior dorsal fin. P. polaris shares with the other species of the genus Palaeobates the same tooth histology (orthodont teeth with pulp cavity), but the ornamentation of the teeth is different. Several studies have shown that it is problematic to deduce phylogenetic relationships among hybodontiform sharks by means of tooth histology. Moreover, orthodont teeth with a pulp cavity are probably plesiomorphic for hybodontiforms. Based on the new find of P. polaris, three other characters are proposed to be apomorphic for Palaeobates in general: (1) the lower margin of the dental groove of Meckel's cartilage runs nearer to the ventral than to the dorsal border of the mandible in P. polaris but medially to these margins of the lower jaw in the crown group hybodontoid Acrodus; (2) the number of tooth files and arrangement of the teeth of P. polaris are well-distinguishable from those of Acrodus and Asteracanthus; and (3) the dorsal fin spines of P. polaris, and also of P. angustissimus, tend to be more slender compared to those of Hybodus and Acrodus. Nonetheless, more material is needed to ascertain if these traits are useful to separate Palaeobates from other hybodontiforms. Text Arctic Svalbard Spitsbergen BioOne Online Journals Arctic Svalbard Svalbard Archipelago Norway Journal of Vertebrate Paleontology 30 6 1673 1683 |
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Open Polar |
collection |
BioOne Online Journals |
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ftbioone |
language |
English |
description |
A new, well-preserved specimen of Palaeobates polaris from the Smithian ‘fish horizon’ of Spitsbergen (Svalbard archipelago, Arctic Norway) is presented. The find is more complete than the type material of P. polaris and contains amongst others the left mandibular branch with associated dentition and labial cartilage as well as elements of the hyoid arch and a portion of the anterior dorsal fin. P. polaris shares with the other species of the genus Palaeobates the same tooth histology (orthodont teeth with pulp cavity), but the ornamentation of the teeth is different. Several studies have shown that it is problematic to deduce phylogenetic relationships among hybodontiform sharks by means of tooth histology. Moreover, orthodont teeth with a pulp cavity are probably plesiomorphic for hybodontiforms. Based on the new find of P. polaris, three other characters are proposed to be apomorphic for Palaeobates in general: (1) the lower margin of the dental groove of Meckel's cartilage runs nearer to the ventral than to the dorsal border of the mandible in P. polaris but medially to these margins of the lower jaw in the crown group hybodontoid Acrodus; (2) the number of tooth files and arrangement of the teeth of P. polaris are well-distinguishable from those of Acrodus and Asteracanthus; and (3) the dorsal fin spines of P. polaris, and also of P. angustissimus, tend to be more slender compared to those of Hybodus and Acrodus. Nonetheless, more material is needed to ascertain if these traits are useful to separate Palaeobates from other hybodontiforms. |
author2 |
Carlo Romano Winand Brinkmann |
format |
Text |
author |
Carlo Romano Winand Brinkmann |
spellingShingle |
Carlo Romano Winand Brinkmann A New Specimen of the Hybodont Shark Palaeobates polaris with Three-Dimensionally Preserved Meckel's Cartilage from the Smithian (Early Triassic) of Spitsbergen |
author_facet |
Carlo Romano Winand Brinkmann |
author_sort |
Carlo Romano |
title |
A New Specimen of the Hybodont Shark Palaeobates polaris with Three-Dimensionally Preserved Meckel's Cartilage from the Smithian (Early Triassic) of Spitsbergen |
title_short |
A New Specimen of the Hybodont Shark Palaeobates polaris with Three-Dimensionally Preserved Meckel's Cartilage from the Smithian (Early Triassic) of Spitsbergen |
title_full |
A New Specimen of the Hybodont Shark Palaeobates polaris with Three-Dimensionally Preserved Meckel's Cartilage from the Smithian (Early Triassic) of Spitsbergen |
title_fullStr |
A New Specimen of the Hybodont Shark Palaeobates polaris with Three-Dimensionally Preserved Meckel's Cartilage from the Smithian (Early Triassic) of Spitsbergen |
title_full_unstemmed |
A New Specimen of the Hybodont Shark Palaeobates polaris with Three-Dimensionally Preserved Meckel's Cartilage from the Smithian (Early Triassic) of Spitsbergen |
title_sort |
new specimen of the hybodont shark palaeobates polaris with three-dimensionally preserved meckel's cartilage from the smithian (early triassic) of spitsbergen |
publisher |
The Society of Vertebrate Paleontology |
publishDate |
2010 |
url |
https://doi.org/10.1080/02724634.2010.521962 |
op_coverage |
world |
geographic |
Arctic Svalbard Svalbard Archipelago Norway |
geographic_facet |
Arctic Svalbard Svalbard Archipelago Norway |
genre |
Arctic Svalbard Spitsbergen |
genre_facet |
Arctic Svalbard Spitsbergen |
op_source |
https://doi.org/10.1080/02724634.2010.521962 |
op_relation |
doi:10.1080/02724634.2010.521962 |
op_rights |
All rights reserved. |
op_doi |
https://doi.org/10.1080/02724634.2010.521962 |
container_title |
Journal of Vertebrate Paleontology |
container_volume |
30 |
container_issue |
6 |
container_start_page |
1673 |
op_container_end_page |
1683 |
_version_ |
1800747042632368128 |