New Poraspids (Agnatha, Heterostraci) from the Early Devonian of the Western United States
A new species of the cythaspid Poraspis is described from the Emsian (Early Devonian) Lippincott Member of the Lost Burro Formation in Death Valley, California. Poraspis thomasi, sp. nov., extends the geographic range of the genus, which had previously been reported from western Europe, Spitsbergen,...
Published in: | Journal of Vertebrate Paleontology |
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Language: | English |
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The Society of Vertebrate Paleontology
2011
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Online Access: | https://doi.org/10.1080/02724634.2011.557113 |
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ftbioone:10.1080/02724634.2011.557113 2024-06-02T07:59:57+00:00 New Poraspids (Agnatha, Heterostraci) from the Early Devonian of the Western United States David K. Elliott Michael A. Petriello David K. Elliott Michael A. Petriello world 2011-05-01 text/HTML https://doi.org/10.1080/02724634.2011.557113 en eng The Society of Vertebrate Paleontology doi:10.1080/02724634.2011.557113 All rights reserved. https://doi.org/10.1080/02724634.2011.557113 Text 2011 ftbioone https://doi.org/10.1080/02724634.2011.557113 2024-05-07T00:50:56Z A new species of the cythaspid Poraspis is described from the Emsian (Early Devonian) Lippincott Member of the Lost Burro Formation in Death Valley, California. Poraspis thomasi, sp. nov., extends the geographic range of the genus, which had previously been reported from western Europe, Spitsbergen, the Canadian Arctic Archipelago, and District of Mackenzie. In addition, the temporal range is extended as the previously described species ranged through the Late Silurian into the Pridoli. This species includes articulated specimens showing that the oral area consisted of a single rectangular oral plate, in contrast with the view that in cyathaspids the area consisted of an arrangement of numerous finger-like plates. Also, one ventral shield shows growth lines indicating that growth of the shield occurred in a posterior direction. An additional poraspid, Lechriaspis patula, gen. et sp. nov., is described from a single specimen from the Grassy Flat Member of the Water Canyon Formation, northern Utah, that shows evidence of puncture wounds indicating predation by a eurypterid. These new heterostracans represent the first true cyathaspids to be described from the Devonian of the western United States. Text Arctic Archipelago Arctic Canadian Arctic Archipelago Spitsbergen BioOne Online Journals Arctic Canadian Arctic Archipelago Journal of Vertebrate Paleontology 31 3 518 530 |
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collection |
BioOne Online Journals |
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ftbioone |
language |
English |
description |
A new species of the cythaspid Poraspis is described from the Emsian (Early Devonian) Lippincott Member of the Lost Burro Formation in Death Valley, California. Poraspis thomasi, sp. nov., extends the geographic range of the genus, which had previously been reported from western Europe, Spitsbergen, the Canadian Arctic Archipelago, and District of Mackenzie. In addition, the temporal range is extended as the previously described species ranged through the Late Silurian into the Pridoli. This species includes articulated specimens showing that the oral area consisted of a single rectangular oral plate, in contrast with the view that in cyathaspids the area consisted of an arrangement of numerous finger-like plates. Also, one ventral shield shows growth lines indicating that growth of the shield occurred in a posterior direction. An additional poraspid, Lechriaspis patula, gen. et sp. nov., is described from a single specimen from the Grassy Flat Member of the Water Canyon Formation, northern Utah, that shows evidence of puncture wounds indicating predation by a eurypterid. These new heterostracans represent the first true cyathaspids to be described from the Devonian of the western United States. |
author2 |
David K. Elliott Michael A. Petriello |
format |
Text |
author |
David K. Elliott Michael A. Petriello |
spellingShingle |
David K. Elliott Michael A. Petriello New Poraspids (Agnatha, Heterostraci) from the Early Devonian of the Western United States |
author_facet |
David K. Elliott Michael A. Petriello |
author_sort |
David K. Elliott |
title |
New Poraspids (Agnatha, Heterostraci) from the Early Devonian of the Western United States |
title_short |
New Poraspids (Agnatha, Heterostraci) from the Early Devonian of the Western United States |
title_full |
New Poraspids (Agnatha, Heterostraci) from the Early Devonian of the Western United States |
title_fullStr |
New Poraspids (Agnatha, Heterostraci) from the Early Devonian of the Western United States |
title_full_unstemmed |
New Poraspids (Agnatha, Heterostraci) from the Early Devonian of the Western United States |
title_sort |
new poraspids (agnatha, heterostraci) from the early devonian of the western united states |
publisher |
The Society of Vertebrate Paleontology |
publishDate |
2011 |
url |
https://doi.org/10.1080/02724634.2011.557113 |
op_coverage |
world |
geographic |
Arctic Canadian Arctic Archipelago |
geographic_facet |
Arctic Canadian Arctic Archipelago |
genre |
Arctic Archipelago Arctic Canadian Arctic Archipelago Spitsbergen |
genre_facet |
Arctic Archipelago Arctic Canadian Arctic Archipelago Spitsbergen |
op_source |
https://doi.org/10.1080/02724634.2011.557113 |
op_relation |
doi:10.1080/02724634.2011.557113 |
op_rights |
All rights reserved. |
op_doi |
https://doi.org/10.1080/02724634.2011.557113 |
container_title |
Journal of Vertebrate Paleontology |
container_volume |
31 |
container_issue |
3 |
container_start_page |
518 |
op_container_end_page |
530 |
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1800743990437347328 |