Boreal waterways: An Early Cretaceous plesiosaur from Ellesmere Island, Nunavut, Canadian Arctic and its palaeobiogeography
A plesiosaur specimen collected from Ellesmere Island (Nunavut, Arctic Canada) by Danish geologist Johannes Troelsen in 1952 is described for the first time. The plesiosaur is late Berriasian to early Valanginian in age based on palynostratigraphy. The specimen is the only plesiosaur known from the...
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Institute of Paleobiology PAS
2024-01-01
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| Series: | Acta Palaeontologica Polonica |
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| Online Access: | https://www.app.pan.pl/archive/published/app69/app011482024.pdf |
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| author | Lene L. Delsett Adam S. Smith Stephen Ingrams Simon Schneider |
| author_facet | Lene L. Delsett Adam S. Smith Stephen Ingrams Simon Schneider |
| author_sort | Lene L. Delsett |
| collection | DOAJ |
| description | A plesiosaur specimen collected from Ellesmere Island (Nunavut, Arctic Canada) by Danish geologist Johannes Troelsen in 1952 is described for the first time. The plesiosaur is late Berriasian to early Valanginian in age based on palynostratigraphy. The specimen is the only plesiosaur known from the Lower Cretaceous of the Sverdrup Basin in the Canadian Arctic, and is assigned to the cryptoclidid genus Colymbosaurus. From a taxonomic point of view, the presence of vertebrae from several regions and four propodials improve our understanding of the morphology of the genus. Furthermore, Colymbosaurus is shown to have survived through the Jurassic–Cretaceous transition. Its presence in the Sverdrup Basin is additional evidence for the connectivity of Arctic Canada and the Svalbard region during the Jurassic–Cretaceous transition, at a time when sea levels were low and microplankton, like dinoflagellates, experienced enhanced provincialism. Last but not least, the new plesiosaur adds to our knowledge of the palaeoenvironment of the Sverdrup Basin, ranking at the top of a food chain that is largely unrecorded from the area, due to adverse taphonomy and diagenesis. |
| format | Article |
| id | doaj-art-6b0e1b9b21de4e14902ccc81f9e8a4bf |
| institution | Kabale University |
| issn | 1732-2421 |
| language | English |
| publishDate | 2024-01-01 |
| publisher | Institute of Paleobiology PAS |
| record_format | Article |
| series | Acta Palaeontologica Polonica |
| spelling | doaj-art-6b0e1b9b21de4e14902ccc81f9e8a4bf2025-01-15T13:41:49ZengInstitute of Paleobiology PASActa Palaeontologica Polonica1732-24212024-01-0169460763210.4202/app.01148.2024Boreal waterways: An Early Cretaceous plesiosaur from Ellesmere Island, Nunavut, Canadian Arctic and its palaeobiogeographyLene L. Delsett0Adam S. Smith1Stephen Ingrams2Simon Schneider3Natural History Museum, University of Oslo, Oslo, Norway.Nottingham Natural History Museum, Wollaton Hall, Nottingham, NG8 2AE, UK. CGG, Tyn-y-Coed, Pentywyn Road, Llandudno LL30 1SA, UK.CASP, West Building, Madingley Rise, Madingley Road, Cambridge CB3 0UD, UK.A plesiosaur specimen collected from Ellesmere Island (Nunavut, Arctic Canada) by Danish geologist Johannes Troelsen in 1952 is described for the first time. The plesiosaur is late Berriasian to early Valanginian in age based on palynostratigraphy. The specimen is the only plesiosaur known from the Lower Cretaceous of the Sverdrup Basin in the Canadian Arctic, and is assigned to the cryptoclidid genus Colymbosaurus. From a taxonomic point of view, the presence of vertebrae from several regions and four propodials improve our understanding of the morphology of the genus. Furthermore, Colymbosaurus is shown to have survived through the Jurassic–Cretaceous transition. Its presence in the Sverdrup Basin is additional evidence for the connectivity of Arctic Canada and the Svalbard region during the Jurassic–Cretaceous transition, at a time when sea levels were low and microplankton, like dinoflagellates, experienced enhanced provincialism. Last but not least, the new plesiosaur adds to our knowledge of the palaeoenvironment of the Sverdrup Basin, ranking at the top of a food chain that is largely unrecorded from the area, due to adverse taphonomy and diagenesis.https://www.app.pan.pl/archive/published/app69/app011482024.pdfplesiosauriacolymbosauruspalaeobiogeographyearly cretaceoussverdrup basinellesmere islandnunavutcanada |
| spellingShingle | Lene L. Delsett Adam S. Smith Stephen Ingrams Simon Schneider Boreal waterways: An Early Cretaceous plesiosaur from Ellesmere Island, Nunavut, Canadian Arctic and its palaeobiogeography Acta Palaeontologica Polonica plesiosauria colymbosaurus palaeobiogeography early cretaceous sverdrup basin ellesmere island nunavut canada |
| title | Boreal waterways: An Early Cretaceous plesiosaur from Ellesmere Island, Nunavut, Canadian Arctic and its palaeobiogeography |
| title_full | Boreal waterways: An Early Cretaceous plesiosaur from Ellesmere Island, Nunavut, Canadian Arctic and its palaeobiogeography |
| title_fullStr | Boreal waterways: An Early Cretaceous plesiosaur from Ellesmere Island, Nunavut, Canadian Arctic and its palaeobiogeography |
| title_full_unstemmed | Boreal waterways: An Early Cretaceous plesiosaur from Ellesmere Island, Nunavut, Canadian Arctic and its palaeobiogeography |
| title_short | Boreal waterways: An Early Cretaceous plesiosaur from Ellesmere Island, Nunavut, Canadian Arctic and its palaeobiogeography |
| title_sort | boreal waterways an early cretaceous plesiosaur from ellesmere island nunavut canadian arctic and its palaeobiogeography |
| topic | plesiosauria colymbosaurus palaeobiogeography early cretaceous sverdrup basin ellesmere island nunavut canada |
| url | https://www.app.pan.pl/archive/published/app69/app011482024.pdf |
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