Late Ordovician and Silurian lichid trilobites from northwestern Canada: Hemiarges, Borealarges , and Richterarges
Four new species of Borealarges, B. fritillus, B. patulus, B. renodis , and B. variabilis , and one new species of Richterarges, R. facetus , are described and one unnamed species, Borealarges sp., discussed. All are from the Wenlock strata of Avalanche Lake sections in the Mackenzie Mountains, Nort...
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crcambridgeupr:10.1666/06-008.1 2023-05-15T15:03:32+02:00 Late Ordovician and Silurian lichid trilobites from northwestern Canada: Hemiarges, Borealarges , and Richterarges Campbell, Margaret J. Chatterton, Brian D. E. 2007 http://dx.doi.org/10.1666/06-008.1 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022336000051842 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Journal of Paleontology volume 81, issue 6, page 1348-1364 ISSN 0022-3360 1937-2337 Paleontology journal-article 2007 crcambridgeupr https://doi.org/10.1666/06-008.1 2022-04-07T08:53:50Z Four new species of Borealarges, B. fritillus, B. patulus, B. renodis , and B. variabilis , and one new species of Richterarges, R. facetus , are described and one unnamed species, Borealarges sp., discussed. All are from the Wenlock strata of Avalanche Lake sections in the Mackenzie Mountains, Northwest Territories. Borealarges tuckerae Adrain, 1994, the only species reported from both the Arctic and the Mackenzie Mountains, is discussed. Hemiarges avalanchensis n. sp., an Ashgill species from Avalanche Lake section AV 4B just below the Ordovician-Silurian boundary, is described. A phylogenetic analysis based on 14 species of Borealarges , three of Richterarges , and two of Hemiarges , demonstrates that the former two genera are three separate and distinct taxa. Borealarges , a genus that includes some species formerly assigned to Richterarges or Hemiarges , is monophyletic, contains a well-supported internal clade of species, and is not separated into senso stricto and senso lato groupings. Article in Journal/Newspaper Arctic Mackenzie mountains Northwest Territories Cambridge University Press (via Crossref) Arctic Northwest Territories Canada Avalanche Lake ENVELOPE(-127.235,-127.235,62.417,62.417) Journal of Paleontology 81 6 1348 1364 |
institution |
Open Polar |
collection |
Cambridge University Press (via Crossref) |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Paleontology |
spellingShingle |
Paleontology Campbell, Margaret J. Chatterton, Brian D. E. Late Ordovician and Silurian lichid trilobites from northwestern Canada: Hemiarges, Borealarges , and Richterarges |
topic_facet |
Paleontology |
description |
Four new species of Borealarges, B. fritillus, B. patulus, B. renodis , and B. variabilis , and one new species of Richterarges, R. facetus , are described and one unnamed species, Borealarges sp., discussed. All are from the Wenlock strata of Avalanche Lake sections in the Mackenzie Mountains, Northwest Territories. Borealarges tuckerae Adrain, 1994, the only species reported from both the Arctic and the Mackenzie Mountains, is discussed. Hemiarges avalanchensis n. sp., an Ashgill species from Avalanche Lake section AV 4B just below the Ordovician-Silurian boundary, is described. A phylogenetic analysis based on 14 species of Borealarges , three of Richterarges , and two of Hemiarges , demonstrates that the former two genera are three separate and distinct taxa. Borealarges , a genus that includes some species formerly assigned to Richterarges or Hemiarges , is monophyletic, contains a well-supported internal clade of species, and is not separated into senso stricto and senso lato groupings. |
format |
Article in Journal/Newspaper |
author |
Campbell, Margaret J. Chatterton, Brian D. E. |
author_facet |
Campbell, Margaret J. Chatterton, Brian D. E. |
author_sort |
Campbell, Margaret J. |
title |
Late Ordovician and Silurian lichid trilobites from northwestern Canada: Hemiarges, Borealarges , and Richterarges |
title_short |
Late Ordovician and Silurian lichid trilobites from northwestern Canada: Hemiarges, Borealarges , and Richterarges |
title_full |
Late Ordovician and Silurian lichid trilobites from northwestern Canada: Hemiarges, Borealarges , and Richterarges |
title_fullStr |
Late Ordovician and Silurian lichid trilobites from northwestern Canada: Hemiarges, Borealarges , and Richterarges |
title_full_unstemmed |
Late Ordovician and Silurian lichid trilobites from northwestern Canada: Hemiarges, Borealarges , and Richterarges |
title_sort |
late ordovician and silurian lichid trilobites from northwestern canada: hemiarges, borealarges , and richterarges |
publisher |
Cambridge University Press (CUP) |
publishDate |
2007 |
url |
http://dx.doi.org/10.1666/06-008.1 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022336000051842 |
long_lat |
ENVELOPE(-127.235,-127.235,62.417,62.417) |
geographic |
Arctic Northwest Territories Canada Avalanche Lake |
geographic_facet |
Arctic Northwest Territories Canada Avalanche Lake |
genre |
Arctic Mackenzie mountains Northwest Territories |
genre_facet |
Arctic Mackenzie mountains Northwest Territories |
op_source |
Journal of Paleontology volume 81, issue 6, page 1348-1364 ISSN 0022-3360 1937-2337 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1666/06-008.1 |
container_title |
Journal of Paleontology |
container_volume |
81 |
container_issue |
6 |
container_start_page |
1348 |
op_container_end_page |
1364 |
_version_ |
1766335382886023168 |