A possibly deep branching artiopodan arthropod from the lower Cambrian Sirius Passet Lagerstätte (North Greenland)
Abstract Artiopoda was a diverse group of Palaeozoic euarthropods that proliferated in the early Palaeozoic, epitomized by the ubiquitous trilobites. Their possible phylogenetic position outside mandibulates and chelicerates offers the potential for understanding the evolution of euarthropods in mor...
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crwiley:10.1002/spp2.1495 2024-06-02T08:07:27+00:00 A possibly deep branching artiopodan arthropod from the lower Cambrian Sirius Passet Lagerstätte (North Greenland) Berks, Harry O. Lunde Nielsen, Morten Flannery‐Sutherland, Joseph Thorshøj Nielsen, Arne Park, Tae‐Yoon S. Vinther, Jakob Palaeontological Association Ministry of Oceans and Fisheries 2023 http://dx.doi.org/10.1002/spp2.1495 https://onlinelibrary.wiley.com/doi/pdf/10.1002/spp2.1495 en eng Wiley http://creativecommons.org/licenses/by-nc/4.0/ Papers in Palaeontology volume 9, issue 3 ISSN 2056-2799 2056-2802 journal-article 2023 crwiley https://doi.org/10.1002/spp2.1495 2024-05-03T11:05:14Z Abstract Artiopoda was a diverse group of Palaeozoic euarthropods that proliferated in the early Palaeozoic, epitomized by the ubiquitous trilobites. Their possible phylogenetic position outside mandibulates and chelicerates offers the potential for understanding the evolution of euarthropods in more detail. However, this opportunity remains unexploited given that identification of deep‐splitting artiopodans remains to be fully explored. Here, we describe a new non‐trilobite artiopodan from the lower Cambrian Sirius Passet Lagerstätte, North Greenland. Thulaspis tholops gen. et sp. nov. is a large species with a broad, domed head shield, followed by a trunk consisting of 15 thoracic tergites and a small pygidium, giving the body an ovoid appearance when viewed dorsally. Thulaspis is distinctive with its rounded genae and anterior thoracic pleural tips, as well as short pleural spines posteriorly. A heart‐shaped hypostome with an anterior lobe is present. Appendages, partly obscured by the tergal skeleton, have many moderate length gnathobasic spines, and large flap‐like exopods with a fringe of small setae. Cladistic analyses recover Thulaspis as the sister taxon to Squamacula , a genus found in the Chengjiang and Emu Bay Shale biotas, in either a polytomy with a number of artiopodan taxa or as a sister group to all other artiopodans, indicating an important role in understanding the roots of artiopodan anatomy and evolution. Article in Journal/Newspaper Greenland North Greenland Wiley Online Library Greenland Sirius ENVELOPE(163.250,163.250,-84.133,-84.133) Papers in Palaeontology 9 3 |
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Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
Abstract Artiopoda was a diverse group of Palaeozoic euarthropods that proliferated in the early Palaeozoic, epitomized by the ubiquitous trilobites. Their possible phylogenetic position outside mandibulates and chelicerates offers the potential for understanding the evolution of euarthropods in more detail. However, this opportunity remains unexploited given that identification of deep‐splitting artiopodans remains to be fully explored. Here, we describe a new non‐trilobite artiopodan from the lower Cambrian Sirius Passet Lagerstätte, North Greenland. Thulaspis tholops gen. et sp. nov. is a large species with a broad, domed head shield, followed by a trunk consisting of 15 thoracic tergites and a small pygidium, giving the body an ovoid appearance when viewed dorsally. Thulaspis is distinctive with its rounded genae and anterior thoracic pleural tips, as well as short pleural spines posteriorly. A heart‐shaped hypostome with an anterior lobe is present. Appendages, partly obscured by the tergal skeleton, have many moderate length gnathobasic spines, and large flap‐like exopods with a fringe of small setae. Cladistic analyses recover Thulaspis as the sister taxon to Squamacula , a genus found in the Chengjiang and Emu Bay Shale biotas, in either a polytomy with a number of artiopodan taxa or as a sister group to all other artiopodans, indicating an important role in understanding the roots of artiopodan anatomy and evolution. |
author2 |
Palaeontological Association Ministry of Oceans and Fisheries |
format |
Article in Journal/Newspaper |
author |
Berks, Harry O. Lunde Nielsen, Morten Flannery‐Sutherland, Joseph Thorshøj Nielsen, Arne Park, Tae‐Yoon S. Vinther, Jakob |
spellingShingle |
Berks, Harry O. Lunde Nielsen, Morten Flannery‐Sutherland, Joseph Thorshøj Nielsen, Arne Park, Tae‐Yoon S. Vinther, Jakob A possibly deep branching artiopodan arthropod from the lower Cambrian Sirius Passet Lagerstätte (North Greenland) |
author_facet |
Berks, Harry O. Lunde Nielsen, Morten Flannery‐Sutherland, Joseph Thorshøj Nielsen, Arne Park, Tae‐Yoon S. Vinther, Jakob |
author_sort |
Berks, Harry O. |
title |
A possibly deep branching artiopodan arthropod from the lower Cambrian Sirius Passet Lagerstätte (North Greenland) |
title_short |
A possibly deep branching artiopodan arthropod from the lower Cambrian Sirius Passet Lagerstätte (North Greenland) |
title_full |
A possibly deep branching artiopodan arthropod from the lower Cambrian Sirius Passet Lagerstätte (North Greenland) |
title_fullStr |
A possibly deep branching artiopodan arthropod from the lower Cambrian Sirius Passet Lagerstätte (North Greenland) |
title_full_unstemmed |
A possibly deep branching artiopodan arthropod from the lower Cambrian Sirius Passet Lagerstätte (North Greenland) |
title_sort |
possibly deep branching artiopodan arthropod from the lower cambrian sirius passet lagerstätte (north greenland) |
publisher |
Wiley |
publishDate |
2023 |
url |
http://dx.doi.org/10.1002/spp2.1495 https://onlinelibrary.wiley.com/doi/pdf/10.1002/spp2.1495 |
long_lat |
ENVELOPE(163.250,163.250,-84.133,-84.133) |
geographic |
Greenland Sirius |
geographic_facet |
Greenland Sirius |
genre |
Greenland North Greenland |
genre_facet |
Greenland North Greenland |
op_source |
Papers in Palaeontology volume 9, issue 3 ISSN 2056-2799 2056-2802 |
op_rights |
http://creativecommons.org/licenses/by-nc/4.0/ |
op_doi |
https://doi.org/10.1002/spp2.1495 |
container_title |
Papers in Palaeontology |
container_volume |
9 |
container_issue |
3 |
_version_ |
1800752533482766336 |