Large onychites (cephalopod hooks) from the Upper Jurassic of the Boreal Realm
We report on the discovery of large cephalopod arm hooks (mega−onychites) from the Kimmeridgian and Volgian of Spitsbergen (Agardhfjellet Formation). This includes a largely uncompressed hook in a seep carbonate, with preservation of surface sculpture. We suggest the use of logarithmic spirals as mo...
Published in: | Acta Palaeontologica Polonica |
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Institute of Paleobiology, Polish Academy of Sciences
2013
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Online Access: | https://researchonline.jcu.edu.au/49586/1/49586_Hammer%20et%20al_2013.pdf |
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ftjamescook:oai:researchonline.jcu.edu.au:49586 2024-02-11T10:04:20+01:00 Large onychites (cephalopod hooks) from the Upper Jurassic of the Boreal Realm Hammer, Øyvind Hryniewicz, Krzysztof Hurum, Jørn H. Høyberget, Magne Knutsen, Espen Nakrem, Hans A. 2013 application/pdf https://researchonline.jcu.edu.au/49586/1/49586_Hammer%20et%20al_2013.pdf unknown Institute of Paleobiology, Polish Academy of Sciences http://dx.doi.org/10.4202/app.2012.0020 https://researchonline.jcu.edu.au/49586/ https://researchonline.jcu.edu.au/49586/1/49586_Hammer%20et%20al_2013.pdf Hammer, Øyvind, Hryniewicz, Krzysztof, Hurum, Jørn H., Høyberget, Magne, Knutsen, Espen, and Nakrem, Hans A. (2013) Large onychites (cephalopod hooks) from the Upper Jurassic of the Boreal Realm. Acta Palaeontologica Polonica, 58 (4). pp. 827-835. open Article PeerReviewed 2013 ftjamescook https://doi.org/10.4202/app.2012.0020 2024-01-22T23:39:55Z We report on the discovery of large cephalopod arm hooks (mega−onychites) from the Kimmeridgian and Volgian of Spitsbergen (Agardhfjellet Formation). This includes a largely uncompressed hook in a seep carbonate, with preservation of surface sculpture. We suggest the use of logarithmic spirals as morphological descriptors for the outer part of cephalopod arm hooks, with implications for systematics and functional morphology. Comparison with Upper Jurassic material from Greenland, northern Norway and the North Sea demonstrates a remarkably consistent morphology, which we assign to the same form species, Onychites quenstedti. Considering the relatively small stratigraphic (Kimmeridgian–Volgian) and biogeographic (Boreal) range of this large form, it is likely that it represents a single biological species or genus. Article in Journal/Newspaper Greenland Northern Norway Spitsbergen James Cook University, Australia: ResearchOnline@JCU Agardhfjellet ENVELOPE(18.833,18.833,78.083,78.083) Greenland Norway Acta Palaeontologica Polonica |
institution |
Open Polar |
collection |
James Cook University, Australia: ResearchOnline@JCU |
op_collection_id |
ftjamescook |
language |
unknown |
description |
We report on the discovery of large cephalopod arm hooks (mega−onychites) from the Kimmeridgian and Volgian of Spitsbergen (Agardhfjellet Formation). This includes a largely uncompressed hook in a seep carbonate, with preservation of surface sculpture. We suggest the use of logarithmic spirals as morphological descriptors for the outer part of cephalopod arm hooks, with implications for systematics and functional morphology. Comparison with Upper Jurassic material from Greenland, northern Norway and the North Sea demonstrates a remarkably consistent morphology, which we assign to the same form species, Onychites quenstedti. Considering the relatively small stratigraphic (Kimmeridgian–Volgian) and biogeographic (Boreal) range of this large form, it is likely that it represents a single biological species or genus. |
format |
Article in Journal/Newspaper |
author |
Hammer, Øyvind Hryniewicz, Krzysztof Hurum, Jørn H. Høyberget, Magne Knutsen, Espen Nakrem, Hans A. |
spellingShingle |
Hammer, Øyvind Hryniewicz, Krzysztof Hurum, Jørn H. Høyberget, Magne Knutsen, Espen Nakrem, Hans A. Large onychites (cephalopod hooks) from the Upper Jurassic of the Boreal Realm |
author_facet |
Hammer, Øyvind Hryniewicz, Krzysztof Hurum, Jørn H. Høyberget, Magne Knutsen, Espen Nakrem, Hans A. |
author_sort |
Hammer, Øyvind |
title |
Large onychites (cephalopod hooks) from the Upper Jurassic of the Boreal Realm |
title_short |
Large onychites (cephalopod hooks) from the Upper Jurassic of the Boreal Realm |
title_full |
Large onychites (cephalopod hooks) from the Upper Jurassic of the Boreal Realm |
title_fullStr |
Large onychites (cephalopod hooks) from the Upper Jurassic of the Boreal Realm |
title_full_unstemmed |
Large onychites (cephalopod hooks) from the Upper Jurassic of the Boreal Realm |
title_sort |
large onychites (cephalopod hooks) from the upper jurassic of the boreal realm |
publisher |
Institute of Paleobiology, Polish Academy of Sciences |
publishDate |
2013 |
url |
https://researchonline.jcu.edu.au/49586/1/49586_Hammer%20et%20al_2013.pdf |
long_lat |
ENVELOPE(18.833,18.833,78.083,78.083) |
geographic |
Agardhfjellet Greenland Norway |
geographic_facet |
Agardhfjellet Greenland Norway |
genre |
Greenland Northern Norway Spitsbergen |
genre_facet |
Greenland Northern Norway Spitsbergen |
op_relation |
http://dx.doi.org/10.4202/app.2012.0020 https://researchonline.jcu.edu.au/49586/ https://researchonline.jcu.edu.au/49586/1/49586_Hammer%20et%20al_2013.pdf Hammer, Øyvind, Hryniewicz, Krzysztof, Hurum, Jørn H., Høyberget, Magne, Knutsen, Espen, and Nakrem, Hans A. (2013) Large onychites (cephalopod hooks) from the Upper Jurassic of the Boreal Realm. Acta Palaeontologica Polonica, 58 (4). pp. 827-835. |
op_rights |
open |
op_doi |
https://doi.org/10.4202/app.2012.0020 |
container_title |
Acta Palaeontologica Polonica |
_version_ |
1790600914826952704 |