Ordovician proetide trilobite Dimeropyge , with a new species from northwestern Canada
Dimeropyge öpik, 1937, is a genus currently composed of at least 14 similar Middle (predominantly) to possibly lowest Upper Ordovician species from Laurentia (13 species) and Baltica (one species). Possible Lower Ordovician specimens have been illustrated by Ross (1951). Dimeropyge clintonensis Shaw...
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Cambridge University Press (CUP)
1994
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Online Access: | http://dx.doi.org/10.1017/s0022336000025919 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022336000025919 |
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crcambridgeupr:10.1017/s0022336000025919 2024-03-03T08:46:23+00:00 Ordovician proetide trilobite Dimeropyge , with a new species from northwestern Canada Chatterton, Brian D. E. 1994 http://dx.doi.org/10.1017/s0022336000025919 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022336000025919 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Journal of Paleontology volume 68, issue 3, page 541-556 ISSN 0022-3360 1937-2337 Paleontology journal-article 1994 crcambridgeupr https://doi.org/10.1017/s0022336000025919 2024-02-08T08:45:07Z Dimeropyge öpik, 1937, is a genus currently composed of at least 14 similar Middle (predominantly) to possibly lowest Upper Ordovician species from Laurentia (13 species) and Baltica (one species). Possible Lower Ordovician specimens have been illustrated by Ross (1951). Dimeropyge clintonensis Shaw, 1968, is redescribed, based upon additional material of mature topotypes. A new species of Dimeropyge, D. speyeri , is proposed for material from the Esbataottine Formation in the Mackenzie Mountains, northwestern Canada, previously described as D. clintonensis. A phylogenetic analysis of 10 of the 14 species of this genus is presented (the other species are less completely known, and are related to the analyzed species in a more traditional manner). Ontogenies from protaspid to holaspid stages are provided for D. clintonensis, D. speyeri , and D. virginiensis Whittington and Evitt, 1954. The larval stages of these species are very similar, supporting the close relationship between species assigned to Dimeropyge. Article in Journal/Newspaper Mackenzie mountains Cambridge University Press Canada Journal of Paleontology 68 3 541 556 |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
topic |
Paleontology |
spellingShingle |
Paleontology Chatterton, Brian D. E. Ordovician proetide trilobite Dimeropyge , with a new species from northwestern Canada |
topic_facet |
Paleontology |
description |
Dimeropyge öpik, 1937, is a genus currently composed of at least 14 similar Middle (predominantly) to possibly lowest Upper Ordovician species from Laurentia (13 species) and Baltica (one species). Possible Lower Ordovician specimens have been illustrated by Ross (1951). Dimeropyge clintonensis Shaw, 1968, is redescribed, based upon additional material of mature topotypes. A new species of Dimeropyge, D. speyeri , is proposed for material from the Esbataottine Formation in the Mackenzie Mountains, northwestern Canada, previously described as D. clintonensis. A phylogenetic analysis of 10 of the 14 species of this genus is presented (the other species are less completely known, and are related to the analyzed species in a more traditional manner). Ontogenies from protaspid to holaspid stages are provided for D. clintonensis, D. speyeri , and D. virginiensis Whittington and Evitt, 1954. The larval stages of these species are very similar, supporting the close relationship between species assigned to Dimeropyge. |
format |
Article in Journal/Newspaper |
author |
Chatterton, Brian D. E. |
author_facet |
Chatterton, Brian D. E. |
author_sort |
Chatterton, Brian D. E. |
title |
Ordovician proetide trilobite Dimeropyge , with a new species from northwestern Canada |
title_short |
Ordovician proetide trilobite Dimeropyge , with a new species from northwestern Canada |
title_full |
Ordovician proetide trilobite Dimeropyge , with a new species from northwestern Canada |
title_fullStr |
Ordovician proetide trilobite Dimeropyge , with a new species from northwestern Canada |
title_full_unstemmed |
Ordovician proetide trilobite Dimeropyge , with a new species from northwestern Canada |
title_sort |
ordovician proetide trilobite dimeropyge , with a new species from northwestern canada |
publisher |
Cambridge University Press (CUP) |
publishDate |
1994 |
url |
http://dx.doi.org/10.1017/s0022336000025919 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022336000025919 |
geographic |
Canada |
geographic_facet |
Canada |
genre |
Mackenzie mountains |
genre_facet |
Mackenzie mountains |
op_source |
Journal of Paleontology volume 68, issue 3, page 541-556 ISSN 0022-3360 1937-2337 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0022336000025919 |
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Journal of Paleontology |
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68 |
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3 |
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541 |
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556 |
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1792502408648065024 |