The phylogenetic affinity of the Ordovician trilobites Agerina , Forteyaspis gen. nov., and related genera, with new and revised species from Canada and the United States
A phylogenetically related group of variably well-known Ordovician trilobites have in the past been assigned to six separate genera and a number of families, and their taxonomic cohesiveness has not always been recognized. When most of them have been understood to form an evolutionarily related grou...
Published in: | Canadian Journal of Earth Sciences |
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crcansciencepubl:10.1139/cjes-2021-0105 2023-12-17T10:44:33+01:00 The phylogenetic affinity of the Ordovician trilobites Agerina , Forteyaspis gen. nov., and related genera, with new and revised species from Canada and the United States Karim, Talia S. Adrain, Jonathan M. 2022 http://dx.doi.org/10.1139/cjes-2021-0105 https://cdnsciencepub.com/doi/full-xml/10.1139/cjes-2021-0105 https://cdnsciencepub.com/doi/pdf/10.1139/cjes-2021-0105 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 59, issue 3, page 156-179 ISSN 0008-4077 1480-3313 General Earth and Planetary Sciences journal-article 2022 crcansciencepubl https://doi.org/10.1139/cjes-2021-0105 2023-11-19T13:39:09Z A phylogenetically related group of variably well-known Ordovician trilobites have in the past been assigned to six separate genera and a number of families, and their taxonomic cohesiveness has not always been recognized. When most of them have been understood to form an evolutionarily related group, they have historically most often been assigned to the genus Agerina Tjernvik, 1956, and assigned initially to Bathyuridae Walcott, 1886, and more recently to Leiostegiidae Bradley, 1925. The systematics of this group is revised, and its 25 formally named species are assigned to four potentially monophyletic genera. Ontogenetic information from a new silicified species, together with some adult morphology, demonstrates that the group is unambiguously related to the Ordovician family Phillipsinellidae Whittington, 1950, to which it is assigned as a suite of less derived genera. The new genus Forteyaspis (type species Forteyaspis idoli sp. nov. from the Darriwilian of western Newfoundland, Canada) is proposed for four Laurentian species, and other species are assigned to the genera Agerina, Brackebuschia Harrington and Leanza, 1957, and Hexianella Zhang in Qiu et al. Other new species are Agerina boygeorgei (Floian, Nevada, USA) and Forteyaspis adamanti (Floian, western Newfoundland, Canada). Forteyaspis norrisi (Ludvigsen, 1980) is photographically revised. Article in Journal/Newspaper Newfoundland Canadian Science Publishing (via Crossref) Canada Walcott ENVELOPE(-63.317,-63.317,-69.083,-69.083) Canadian Journal of Earth Sciences 59 3 156 179 |
institution |
Open Polar |
collection |
Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
General Earth and Planetary Sciences |
spellingShingle |
General Earth and Planetary Sciences Karim, Talia S. Adrain, Jonathan M. The phylogenetic affinity of the Ordovician trilobites Agerina , Forteyaspis gen. nov., and related genera, with new and revised species from Canada and the United States |
topic_facet |
General Earth and Planetary Sciences |
description |
A phylogenetically related group of variably well-known Ordovician trilobites have in the past been assigned to six separate genera and a number of families, and their taxonomic cohesiveness has not always been recognized. When most of them have been understood to form an evolutionarily related group, they have historically most often been assigned to the genus Agerina Tjernvik, 1956, and assigned initially to Bathyuridae Walcott, 1886, and more recently to Leiostegiidae Bradley, 1925. The systematics of this group is revised, and its 25 formally named species are assigned to four potentially monophyletic genera. Ontogenetic information from a new silicified species, together with some adult morphology, demonstrates that the group is unambiguously related to the Ordovician family Phillipsinellidae Whittington, 1950, to which it is assigned as a suite of less derived genera. The new genus Forteyaspis (type species Forteyaspis idoli sp. nov. from the Darriwilian of western Newfoundland, Canada) is proposed for four Laurentian species, and other species are assigned to the genera Agerina, Brackebuschia Harrington and Leanza, 1957, and Hexianella Zhang in Qiu et al. Other new species are Agerina boygeorgei (Floian, Nevada, USA) and Forteyaspis adamanti (Floian, western Newfoundland, Canada). Forteyaspis norrisi (Ludvigsen, 1980) is photographically revised. |
format |
Article in Journal/Newspaper |
author |
Karim, Talia S. Adrain, Jonathan M. |
author_facet |
Karim, Talia S. Adrain, Jonathan M. |
author_sort |
Karim, Talia S. |
title |
The phylogenetic affinity of the Ordovician trilobites Agerina , Forteyaspis gen. nov., and related genera, with new and revised species from Canada and the United States |
title_short |
The phylogenetic affinity of the Ordovician trilobites Agerina , Forteyaspis gen. nov., and related genera, with new and revised species from Canada and the United States |
title_full |
The phylogenetic affinity of the Ordovician trilobites Agerina , Forteyaspis gen. nov., and related genera, with new and revised species from Canada and the United States |
title_fullStr |
The phylogenetic affinity of the Ordovician trilobites Agerina , Forteyaspis gen. nov., and related genera, with new and revised species from Canada and the United States |
title_full_unstemmed |
The phylogenetic affinity of the Ordovician trilobites Agerina , Forteyaspis gen. nov., and related genera, with new and revised species from Canada and the United States |
title_sort |
phylogenetic affinity of the ordovician trilobites agerina , forteyaspis gen. nov., and related genera, with new and revised species from canada and the united states |
publisher |
Canadian Science Publishing |
publishDate |
2022 |
url |
http://dx.doi.org/10.1139/cjes-2021-0105 https://cdnsciencepub.com/doi/full-xml/10.1139/cjes-2021-0105 https://cdnsciencepub.com/doi/pdf/10.1139/cjes-2021-0105 |
long_lat |
ENVELOPE(-63.317,-63.317,-69.083,-69.083) |
geographic |
Canada Walcott |
geographic_facet |
Canada Walcott |
genre |
Newfoundland |
genre_facet |
Newfoundland |
op_source |
Canadian Journal of Earth Sciences volume 59, issue 3, page 156-179 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/cjes-2021-0105 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
59 |
container_issue |
3 |
container_start_page |
156 |
op_container_end_page |
179 |
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1785562779661369344 |