Classification of the Late Cambrian (Steptoean) trilobite genera Cheilocephalus Berkey, 1898 and Oligometopus Resser, 1936 from Laurentia
All recent work has assigned the genera Cheilocephalus Berkey, 1898 and Oligometopus Resser, 1936 to the family Cheilocephalidae Shaw, 1956, a small group of largely Laurentian trilobites from the Late Cambrian Steptoean Stage. New data from Nevada and Newfoundland indicate that the Cheilocephalidae...
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crcansciencepubl:10.1139/e08-026 2024-09-15T18:19:55+00:00 Classification of the Late Cambrian (Steptoean) trilobite genera Cheilocephalus Berkey, 1898 and Oligometopus Resser, 1936 from Laurentia Westrop, Stephen R. Eoff, Jennifer D. Ng, Tin-Wai Dengler, Alyce A. Adrain, Jonathan M. Jin, Jisuo 2008 http://dx.doi.org/10.1139/e08-026 http://www.nrcresearchpress.com/doi/full-xml/10.1139/E08-026 http://www.nrcresearchpress.com/doi/pdf/10.1139/E08-026 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 45, issue 6, page 725-744 ISSN 0008-4077 1480-3313 journal-article 2008 crcansciencepubl https://doi.org/10.1139/e08-026 2024-08-01T04:10:01Z All recent work has assigned the genera Cheilocephalus Berkey, 1898 and Oligometopus Resser, 1936 to the family Cheilocephalidae Shaw, 1956, a small group of largely Laurentian trilobites from the Late Cambrian Steptoean Stage. New data from Nevada and Newfoundland indicate that the Cheilocephalidae is polyphyletic and that Cheilocephalus and Oligometopus are allied with different superfamilies. The Cheilocephalidae, which includes Cheilocephalus and Pseudokingstonia Palmer, 1965, is assigned to the Dameselloidea Kobayashi, 1935, and a pygidium from the Cow Head Group of Newfoundland indicates that Cheilocephalus first appears in the late Marjuman. The Dameselloidea disappeared on other continents at an extinction interval at the end of the Marjuman, but Cheilocephalus survived and underwent modest diversification in Laurentia in the succeeding Steptoean Stage. Oligometopus is transferred to the leiostegioidean family Leiostegiidae Bradley, 1925. The genus shows closest affinities with such Gondwanan genera as Idamea Whitehouse, 1939, and its appearance in mid-Steptoean strata records immigration of the Leiostegoidea into shelf-margin environments of Laurentia. Article in Journal/Newspaper Newfoundland Canadian Science Publishing Canadian Journal of Earth Sciences 45 6 725 744 |
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Canadian Science Publishing |
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crcansciencepubl |
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English |
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All recent work has assigned the genera Cheilocephalus Berkey, 1898 and Oligometopus Resser, 1936 to the family Cheilocephalidae Shaw, 1956, a small group of largely Laurentian trilobites from the Late Cambrian Steptoean Stage. New data from Nevada and Newfoundland indicate that the Cheilocephalidae is polyphyletic and that Cheilocephalus and Oligometopus are allied with different superfamilies. The Cheilocephalidae, which includes Cheilocephalus and Pseudokingstonia Palmer, 1965, is assigned to the Dameselloidea Kobayashi, 1935, and a pygidium from the Cow Head Group of Newfoundland indicates that Cheilocephalus first appears in the late Marjuman. The Dameselloidea disappeared on other continents at an extinction interval at the end of the Marjuman, but Cheilocephalus survived and underwent modest diversification in Laurentia in the succeeding Steptoean Stage. Oligometopus is transferred to the leiostegioidean family Leiostegiidae Bradley, 1925. The genus shows closest affinities with such Gondwanan genera as Idamea Whitehouse, 1939, and its appearance in mid-Steptoean strata records immigration of the Leiostegoidea into shelf-margin environments of Laurentia. |
author2 |
Jin, Jisuo |
format |
Article in Journal/Newspaper |
author |
Westrop, Stephen R. Eoff, Jennifer D. Ng, Tin-Wai Dengler, Alyce A. Adrain, Jonathan M. |
spellingShingle |
Westrop, Stephen R. Eoff, Jennifer D. Ng, Tin-Wai Dengler, Alyce A. Adrain, Jonathan M. Classification of the Late Cambrian (Steptoean) trilobite genera Cheilocephalus Berkey, 1898 and Oligometopus Resser, 1936 from Laurentia |
author_facet |
Westrop, Stephen R. Eoff, Jennifer D. Ng, Tin-Wai Dengler, Alyce A. Adrain, Jonathan M. |
author_sort |
Westrop, Stephen R. |
title |
Classification of the Late Cambrian (Steptoean) trilobite genera Cheilocephalus Berkey, 1898 and Oligometopus Resser, 1936 from Laurentia |
title_short |
Classification of the Late Cambrian (Steptoean) trilobite genera Cheilocephalus Berkey, 1898 and Oligometopus Resser, 1936 from Laurentia |
title_full |
Classification of the Late Cambrian (Steptoean) trilobite genera Cheilocephalus Berkey, 1898 and Oligometopus Resser, 1936 from Laurentia |
title_fullStr |
Classification of the Late Cambrian (Steptoean) trilobite genera Cheilocephalus Berkey, 1898 and Oligometopus Resser, 1936 from Laurentia |
title_full_unstemmed |
Classification of the Late Cambrian (Steptoean) trilobite genera Cheilocephalus Berkey, 1898 and Oligometopus Resser, 1936 from Laurentia |
title_sort |
classification of the late cambrian (steptoean) trilobite genera cheilocephalus berkey, 1898 and oligometopus resser, 1936 from laurentia |
publisher |
Canadian Science Publishing |
publishDate |
2008 |
url |
http://dx.doi.org/10.1139/e08-026 http://www.nrcresearchpress.com/doi/full-xml/10.1139/E08-026 http://www.nrcresearchpress.com/doi/pdf/10.1139/E08-026 |
genre |
Newfoundland |
genre_facet |
Newfoundland |
op_source |
Canadian Journal of Earth Sciences volume 45, issue 6, page 725-744 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e08-026 |
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Canadian Journal of Earth Sciences |
container_volume |
45 |
container_issue |
6 |
container_start_page |
725 |
op_container_end_page |
744 |
_version_ |
1810458267581677568 |