A New Phytosaur Species (Archosauriformes) from the Upper Triassic of Jameson Land, Central East Greenland
Herein we describe phytosaurs from thin fluvial overbank sandstones of the Upper Triassic Malmros Klint Formation of the Fleming Fjord Group (central East Greenland). The new sample includes more than 150 disarticulated bones and teeth from small to large specimens belonging to at least four individ...
Published in: | Journal of Vertebrate Paleontology |
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The Society of Vertebrate Paleontology
2023
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Online Access: | https://doi.org/10.1080/02724634.2023.2181086 |
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ftbioone:10.1080/02724634.2023.2181086 2024-06-02T08:05:55+00:00 A New Phytosaur Species (Archosauriformes) from the Upper Triassic of Jameson Land, Central East Greenland Víctor López-Rojas Lars B. Clemmensen Jesper Milàn Oliver Wings Nicole Klein Octávio Mateus Víctor López-Rojas Lars B. Clemmensen Jesper Milàn Oliver Wings Nicole Klein Octávio Mateus world 2023-03-24 text/HTML https://doi.org/10.1080/02724634.2023.2181086 en eng The Society of Vertebrate Paleontology doi:10.1080/02724634.2023.2181086 All rights reserved. https://doi.org/10.1080/02724634.2023.2181086 Text 2023 ftbioone https://doi.org/10.1080/02724634.2023.2181086 2024-05-07T00:51:19Z Herein we describe phytosaurs from thin fluvial overbank sandstones of the Upper Triassic Malmros Klint Formation of the Fleming Fjord Group (central East Greenland). The new sample includes more than 150 disarticulated bones and teeth from small to large specimens belonging to at least four individuals. The fossils mostly consist of teeth and postcranial elements and permit the recognition of a new species of Mystriosuchus, M. alleroq, diagnosed by an L-shaped quadratojugal whose anterior suture trends anterodorsally and a tripartite degree of heterodonty. Humeral diaphyseal histology of one specimen reveals a fairly compact cortex that surrounds a cancellous medullary region followed by a remodeling zone containing scattered secondary osteons. Primary bone tissue is parallel-fibred with a moderate to low vascular density. The cortex is cyclically interrupted by distinct growth marks indicating a seasonal environment. A change in growth rate from moderate to low is documented within the outer cortex, indicating that at least this individual was close to somatic maturity. Mystriosuchus has formerly been known as an exclusively European taxon. The new findings support the European faunal influence in East Greenland during the Late Triassic inferred from other taxa such as temnospondyls and archosaurs. The mid-late Norian age of European Mystriosuchus suggests an additional age constraint for the vertebrate-bearing portion of the Malmros Klint Formation. Text East Greenland Greenland BioOne Online Journals Fleming Fjord ENVELOPE(-22.867,-22.867,71.733,71.733) Greenland Jameson Land ENVELOPE(-23.500,-23.500,71.167,71.167) Journal of Vertebrate Paleontology 42 3 |
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English |
description |
Herein we describe phytosaurs from thin fluvial overbank sandstones of the Upper Triassic Malmros Klint Formation of the Fleming Fjord Group (central East Greenland). The new sample includes more than 150 disarticulated bones and teeth from small to large specimens belonging to at least four individuals. The fossils mostly consist of teeth and postcranial elements and permit the recognition of a new species of Mystriosuchus, M. alleroq, diagnosed by an L-shaped quadratojugal whose anterior suture trends anterodorsally and a tripartite degree of heterodonty. Humeral diaphyseal histology of one specimen reveals a fairly compact cortex that surrounds a cancellous medullary region followed by a remodeling zone containing scattered secondary osteons. Primary bone tissue is parallel-fibred with a moderate to low vascular density. The cortex is cyclically interrupted by distinct growth marks indicating a seasonal environment. A change in growth rate from moderate to low is documented within the outer cortex, indicating that at least this individual was close to somatic maturity. Mystriosuchus has formerly been known as an exclusively European taxon. The new findings support the European faunal influence in East Greenland during the Late Triassic inferred from other taxa such as temnospondyls and archosaurs. The mid-late Norian age of European Mystriosuchus suggests an additional age constraint for the vertebrate-bearing portion of the Malmros Klint Formation. |
author2 |
Víctor López-Rojas Lars B. Clemmensen Jesper Milàn Oliver Wings Nicole Klein Octávio Mateus |
format |
Text |
author |
Víctor López-Rojas Lars B. Clemmensen Jesper Milàn Oliver Wings Nicole Klein Octávio Mateus |
spellingShingle |
Víctor López-Rojas Lars B. Clemmensen Jesper Milàn Oliver Wings Nicole Klein Octávio Mateus A New Phytosaur Species (Archosauriformes) from the Upper Triassic of Jameson Land, Central East Greenland |
author_facet |
Víctor López-Rojas Lars B. Clemmensen Jesper Milàn Oliver Wings Nicole Klein Octávio Mateus |
author_sort |
Víctor López-Rojas |
title |
A New Phytosaur Species (Archosauriformes) from the Upper Triassic of Jameson Land, Central East Greenland |
title_short |
A New Phytosaur Species (Archosauriformes) from the Upper Triassic of Jameson Land, Central East Greenland |
title_full |
A New Phytosaur Species (Archosauriformes) from the Upper Triassic of Jameson Land, Central East Greenland |
title_fullStr |
A New Phytosaur Species (Archosauriformes) from the Upper Triassic of Jameson Land, Central East Greenland |
title_full_unstemmed |
A New Phytosaur Species (Archosauriformes) from the Upper Triassic of Jameson Land, Central East Greenland |
title_sort |
new phytosaur species (archosauriformes) from the upper triassic of jameson land, central east greenland |
publisher |
The Society of Vertebrate Paleontology |
publishDate |
2023 |
url |
https://doi.org/10.1080/02724634.2023.2181086 |
op_coverage |
world |
long_lat |
ENVELOPE(-22.867,-22.867,71.733,71.733) ENVELOPE(-23.500,-23.500,71.167,71.167) |
geographic |
Fleming Fjord Greenland Jameson Land |
geographic_facet |
Fleming Fjord Greenland Jameson Land |
genre |
East Greenland Greenland |
genre_facet |
East Greenland Greenland |
op_source |
https://doi.org/10.1080/02724634.2023.2181086 |
op_relation |
doi:10.1080/02724634.2023.2181086 |
op_rights |
All rights reserved. |
op_doi |
https://doi.org/10.1080/02724634.2023.2181086 |
container_title |
Journal of Vertebrate Paleontology |
container_volume |
42 |
container_issue |
3 |
_version_ |
1800750794941661184 |