A new plesiosaurian from the Jurassic–Cretaceous transitional interval of the Slottsmøya Member (Volgian), with insights into the cranial anatomy of cryptoclidids using computed tomography
Cryptoclidids are a major clade of plesiosauromorph plesiosaurians best known from the Middle—Late Jurassic, but little is known regarding their turnover into the Early Cretaceous. Of the known cryptoclidid genera, most preserve only a limited amount of cranial material and of these Cryptoclidus eur...
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ftdoajarticles:oai:doaj.org/article:077edf75aa624e028b76c40dc3aa69c9 2024-01-07T09:46:57+01:00 A new plesiosaurian from the Jurassic–Cretaceous transitional interval of the Slottsmøya Member (Volgian), with insights into the cranial anatomy of cryptoclidids using computed tomography Aubrey Jane Roberts Patrick S. Druckenmiller Benoit Cordonnier Lene L. Delsett Jørn H. Hurum 2020-03-01T00:00:00Z https://doi.org/10.7717/peerj.8652 https://doaj.org/article/077edf75aa624e028b76c40dc3aa69c9 EN eng PeerJ Inc. https://peerj.com/articles/8652.pdf https://peerj.com/articles/8652/ https://doaj.org/toc/2167-8359 doi:10.7717/peerj.8652 2167-8359 https://doaj.org/article/077edf75aa624e028b76c40dc3aa69c9 PeerJ, Vol 8, p e8652 (2020) Plesiosaur Jurassic Cryptoclidid Computed tomography Phylogenetics Svalbard Medicine R Biology (General) QH301-705.5 article 2020 ftdoajarticles https://doi.org/10.7717/peerj.8652 2023-12-10T01:52:27Z Cryptoclidids are a major clade of plesiosauromorph plesiosaurians best known from the Middle—Late Jurassic, but little is known regarding their turnover into the Early Cretaceous. Of the known cryptoclidid genera, most preserve only a limited amount of cranial material and of these Cryptoclidus eurymerus, displays the most complete, but compressed cranium. Thus, the lack of knowledge of the cranial anatomy of this group may hinder the understanding of phylogenetic interrelationships, which are currently predominantly based on postcranial data. Here we present a nearly complete adult cryptoclidid specimen (PMO 224.248) representing a new genus and species Ophthalmothule cryostea gen et sp. nov., from the latest Jurassic to earliest Cretaceous part of the Slottsmøya Member, of central Spitsbergen. The holotype material preserves a complete cranium, partial mandible, complete and articulated cervical, pectoral and anterior to middle dorsal series, along with the pectoral girdle and anterior humeri. High resolution microcomputed tomography reveals new data on the cranial anatomy of this cryptoclidid, including new internal features of the braincase and palate that are observed in other cryptoclidids. A phylogenetic analysis incorporating new characters reveals a novel tree topology for Cryptoclididae and particularly within the subfamily Colymbosaurinae. These results show that at least two cryptoclidid lineages were present in the Boreal Region during the latest Jurassic at middle to high latitudes. Article in Journal/Newspaper Svalbard Spitsbergen Directory of Open Access Journals: DOAJ Articles Slottsmøya ENVELOPE(17.415,17.415,78.046,78.046) Svalbard PeerJ 8 e8652 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Plesiosaur Jurassic Cryptoclidid Computed tomography Phylogenetics Svalbard Medicine R Biology (General) QH301-705.5 |
spellingShingle |
Plesiosaur Jurassic Cryptoclidid Computed tomography Phylogenetics Svalbard Medicine R Biology (General) QH301-705.5 Aubrey Jane Roberts Patrick S. Druckenmiller Benoit Cordonnier Lene L. Delsett Jørn H. Hurum A new plesiosaurian from the Jurassic–Cretaceous transitional interval of the Slottsmøya Member (Volgian), with insights into the cranial anatomy of cryptoclidids using computed tomography |
topic_facet |
Plesiosaur Jurassic Cryptoclidid Computed tomography Phylogenetics Svalbard Medicine R Biology (General) QH301-705.5 |
description |
Cryptoclidids are a major clade of plesiosauromorph plesiosaurians best known from the Middle—Late Jurassic, but little is known regarding their turnover into the Early Cretaceous. Of the known cryptoclidid genera, most preserve only a limited amount of cranial material and of these Cryptoclidus eurymerus, displays the most complete, but compressed cranium. Thus, the lack of knowledge of the cranial anatomy of this group may hinder the understanding of phylogenetic interrelationships, which are currently predominantly based on postcranial data. Here we present a nearly complete adult cryptoclidid specimen (PMO 224.248) representing a new genus and species Ophthalmothule cryostea gen et sp. nov., from the latest Jurassic to earliest Cretaceous part of the Slottsmøya Member, of central Spitsbergen. The holotype material preserves a complete cranium, partial mandible, complete and articulated cervical, pectoral and anterior to middle dorsal series, along with the pectoral girdle and anterior humeri. High resolution microcomputed tomography reveals new data on the cranial anatomy of this cryptoclidid, including new internal features of the braincase and palate that are observed in other cryptoclidids. A phylogenetic analysis incorporating new characters reveals a novel tree topology for Cryptoclididae and particularly within the subfamily Colymbosaurinae. These results show that at least two cryptoclidid lineages were present in the Boreal Region during the latest Jurassic at middle to high latitudes. |
format |
Article in Journal/Newspaper |
author |
Aubrey Jane Roberts Patrick S. Druckenmiller Benoit Cordonnier Lene L. Delsett Jørn H. Hurum |
author_facet |
Aubrey Jane Roberts Patrick S. Druckenmiller Benoit Cordonnier Lene L. Delsett Jørn H. Hurum |
author_sort |
Aubrey Jane Roberts |
title |
A new plesiosaurian from the Jurassic–Cretaceous transitional interval of the Slottsmøya Member (Volgian), with insights into the cranial anatomy of cryptoclidids using computed tomography |
title_short |
A new plesiosaurian from the Jurassic–Cretaceous transitional interval of the Slottsmøya Member (Volgian), with insights into the cranial anatomy of cryptoclidids using computed tomography |
title_full |
A new plesiosaurian from the Jurassic–Cretaceous transitional interval of the Slottsmøya Member (Volgian), with insights into the cranial anatomy of cryptoclidids using computed tomography |
title_fullStr |
A new plesiosaurian from the Jurassic–Cretaceous transitional interval of the Slottsmøya Member (Volgian), with insights into the cranial anatomy of cryptoclidids using computed tomography |
title_full_unstemmed |
A new plesiosaurian from the Jurassic–Cretaceous transitional interval of the Slottsmøya Member (Volgian), with insights into the cranial anatomy of cryptoclidids using computed tomography |
title_sort |
new plesiosaurian from the jurassic–cretaceous transitional interval of the slottsmøya member (volgian), with insights into the cranial anatomy of cryptoclidids using computed tomography |
publisher |
PeerJ Inc. |
publishDate |
2020 |
url |
https://doi.org/10.7717/peerj.8652 https://doaj.org/article/077edf75aa624e028b76c40dc3aa69c9 |
long_lat |
ENVELOPE(17.415,17.415,78.046,78.046) |
geographic |
Slottsmøya Svalbard |
geographic_facet |
Slottsmøya Svalbard |
genre |
Svalbard Spitsbergen |
genre_facet |
Svalbard Spitsbergen |
op_source |
PeerJ, Vol 8, p e8652 (2020) |
op_relation |
https://peerj.com/articles/8652.pdf https://peerj.com/articles/8652/ https://doaj.org/toc/2167-8359 doi:10.7717/peerj.8652 2167-8359 https://doaj.org/article/077edf75aa624e028b76c40dc3aa69c9 |
op_doi |
https://doi.org/10.7717/peerj.8652 |
container_title |
PeerJ |
container_volume |
8 |
container_start_page |
e8652 |
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1787428878900264960 |