Phylogenetic analysis of some Silurian rostroconchs (Mollusca) from northwestern Canada
The new genus Avalanchia and the new species Avalanchia pterocarina, Cassowarioides anisomorpha, Cassowarioides polgari, Nehedia bergeraci, Nehedia restricta, and Nehedia tricarina are proposed from exceptionally preserved silicified faunas. Two new but unnamed rostroconch species are also described...
Published in: | Canadian Journal of Earth Sciences |
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Language: | English |
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Canadian Science Publishing
1995
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Online Access: | http://dx.doi.org/10.1139/e95-068 http://www.nrcresearchpress.com/doi/pdf/10.1139/e95-068 |
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crcansciencepubl:10.1139/e95-068 2024-09-15T18:18:10+00:00 Phylogenetic analysis of some Silurian rostroconchs (Mollusca) from northwestern Canada Caldwell, Michael W. Chatterton, Brian D. E. 1995 http://dx.doi.org/10.1139/e95-068 http://www.nrcresearchpress.com/doi/pdf/10.1139/e95-068 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 32, issue 6, page 806-827 ISSN 0008-4077 1480-3313 journal-article 1995 crcansciencepubl https://doi.org/10.1139/e95-068 2024-07-25T04:10:06Z The new genus Avalanchia and the new species Avalanchia pterocarina, Cassowarioides anisomorpha, Cassowarioides polgari, Nehedia bergeraci, Nehedia restricta, and Nehedia tricarina are proposed from exceptionally preserved silicified faunas. Two new but unnamed rostroconch species are also described. These conocardioid rostroconchs were collected from Silurian deposits (late Llandovery to early Ludlow) near Avalanche Lake in the Mackenzie Mountains, Northwest Territories, Canada, and, when added to global rostroconch faunal lists, indicate a previously unrecognized diversity of Silurian conocardioid rostroconchs. The morphology of conocardioid rostroconchs is discussed, and a glossary of terms presented. Sexual dimorphism is recognized in species of Cassowarioides. Phylogenetic analysis of hippocardiids and bransoniids supports the monophyly of several genera. The hippocardiid genus Bigalea Pojeta and Runnegar, 1976, is recognized as paraphyletic and three species are assigned to a new genus, Redstonia. Preliminary analysis of bransoniids and hippocardiids for familial relationships, using data sets from the within-family analyses, indicates that the Bransoniidae is polyphyletic. The generic complex Mulceodens, considered to be derived bransoniid, is consistently reconstructed within a clade of derived hippocardiids. Article in Journal/Newspaper Mackenzie mountains Northwest Territories Canadian Science Publishing Canadian Journal of Earth Sciences 32 6 806 827 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
description |
The new genus Avalanchia and the new species Avalanchia pterocarina, Cassowarioides anisomorpha, Cassowarioides polgari, Nehedia bergeraci, Nehedia restricta, and Nehedia tricarina are proposed from exceptionally preserved silicified faunas. Two new but unnamed rostroconch species are also described. These conocardioid rostroconchs were collected from Silurian deposits (late Llandovery to early Ludlow) near Avalanche Lake in the Mackenzie Mountains, Northwest Territories, Canada, and, when added to global rostroconch faunal lists, indicate a previously unrecognized diversity of Silurian conocardioid rostroconchs. The morphology of conocardioid rostroconchs is discussed, and a glossary of terms presented. Sexual dimorphism is recognized in species of Cassowarioides. Phylogenetic analysis of hippocardiids and bransoniids supports the monophyly of several genera. The hippocardiid genus Bigalea Pojeta and Runnegar, 1976, is recognized as paraphyletic and three species are assigned to a new genus, Redstonia. Preliminary analysis of bransoniids and hippocardiids for familial relationships, using data sets from the within-family analyses, indicates that the Bransoniidae is polyphyletic. The generic complex Mulceodens, considered to be derived bransoniid, is consistently reconstructed within a clade of derived hippocardiids. |
format |
Article in Journal/Newspaper |
author |
Caldwell, Michael W. Chatterton, Brian D. E. |
spellingShingle |
Caldwell, Michael W. Chatterton, Brian D. E. Phylogenetic analysis of some Silurian rostroconchs (Mollusca) from northwestern Canada |
author_facet |
Caldwell, Michael W. Chatterton, Brian D. E. |
author_sort |
Caldwell, Michael W. |
title |
Phylogenetic analysis of some Silurian rostroconchs (Mollusca) from northwestern Canada |
title_short |
Phylogenetic analysis of some Silurian rostroconchs (Mollusca) from northwestern Canada |
title_full |
Phylogenetic analysis of some Silurian rostroconchs (Mollusca) from northwestern Canada |
title_fullStr |
Phylogenetic analysis of some Silurian rostroconchs (Mollusca) from northwestern Canada |
title_full_unstemmed |
Phylogenetic analysis of some Silurian rostroconchs (Mollusca) from northwestern Canada |
title_sort |
phylogenetic analysis of some silurian rostroconchs (mollusca) from northwestern canada |
publisher |
Canadian Science Publishing |
publishDate |
1995 |
url |
http://dx.doi.org/10.1139/e95-068 http://www.nrcresearchpress.com/doi/pdf/10.1139/e95-068 |
genre |
Mackenzie mountains Northwest Territories |
genre_facet |
Mackenzie mountains Northwest Territories |
op_source |
Canadian Journal of Earth Sciences volume 32, issue 6, page 806-827 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e95-068 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
32 |
container_issue |
6 |
container_start_page |
806 |
op_container_end_page |
827 |
_version_ |
1810456293027086336 |