Odontopleura (Trilobita, Silurian), and a method of constrained congruency analysis
Odontopleura ( Odontopleura ) arctica , a new species of odontopleurine trilobite, is described from the Canadian Arctic. A method of cladistic analysis is detailed. Parsimony analysis should be performed treating all characters as unordered. The universe of directed trees implied by the resulting r...
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Language: | English |
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1990
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Online Access: | http://dx.doi.org/10.1017/s0022336000042645 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022336000042645 |
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crcambridgeupr:10.1017/s0022336000042645 2024-04-28T08:11:03+00:00 Odontopleura (Trilobita, Silurian), and a method of constrained congruency analysis Adrain, Jonathan M. Chatterton, Brian D. E. 1990 http://dx.doi.org/10.1017/s0022336000042645 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022336000042645 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Journal of Paleontology volume 64, issue 4, page 600-614 ISSN 0022-3360 1937-2337 Paleontology journal-article 1990 crcambridgeupr https://doi.org/10.1017/s0022336000042645 2024-04-09T06:55:53Z Odontopleura ( Odontopleura ) arctica , a new species of odontopleurine trilobite, is described from the Canadian Arctic. A method of cladistic analysis is detailed. Parsimony analysis should be performed treating all characters as unordered. The universe of directed trees implied by the resulting rootless network(s) can then be examined and a preferred tree selected by a criterion of congruency. Namely, the most parsimonious directed tree that accommodates the most congruent arrangement of character-states should be taken as the preferred cladogram. Since this is essentially a general congruency method operating within the constraints of parsimony, it is termed “constrained congruency.” The method is applied to the genus Odontopleura , resulting in the recognition of two major species groups, the nominate subgenus and Sinespinaspis n. subgen. Odontopleura ( Ivanopleura ) dufrenoyi Barrande is tentatively included in the genus, but considered too poorly known for cladistic analysis. Species assigned to Odontopleura ( Odontopleura ) include Odontopleura ovata Emmrich, Odontopleura brevigena Chatterton and Perry, Odontopleura ( Odontopleura ) arctica n. sp., and Diacanthaspis serotina Apollonov. Species assigned to Sinespinaspis n. subgen. include Taemasaspis llandoveryana Šnajdr, Odontopleura greenwoodi Chatterton and Perry, Odontopleura maccallai Chatterton and Perry, and Odontopleura nehedensis Chatterton and Perry. Odontopleura bombini Chatterton and Perry is tentatively placed in synonymy with Odontopleura nehedensis . The genus had a wide distribution throughout the Early and Middle Silurian, due to preferences for deep-water, distal shelf or shelf-slope transition zone habitats. Article in Journal/Newspaper Arctic Cambridge University Press Journal of Paleontology 64 4 600 614 |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
topic |
Paleontology |
spellingShingle |
Paleontology Adrain, Jonathan M. Chatterton, Brian D. E. Odontopleura (Trilobita, Silurian), and a method of constrained congruency analysis |
topic_facet |
Paleontology |
description |
Odontopleura ( Odontopleura ) arctica , a new species of odontopleurine trilobite, is described from the Canadian Arctic. A method of cladistic analysis is detailed. Parsimony analysis should be performed treating all characters as unordered. The universe of directed trees implied by the resulting rootless network(s) can then be examined and a preferred tree selected by a criterion of congruency. Namely, the most parsimonious directed tree that accommodates the most congruent arrangement of character-states should be taken as the preferred cladogram. Since this is essentially a general congruency method operating within the constraints of parsimony, it is termed “constrained congruency.” The method is applied to the genus Odontopleura , resulting in the recognition of two major species groups, the nominate subgenus and Sinespinaspis n. subgen. Odontopleura ( Ivanopleura ) dufrenoyi Barrande is tentatively included in the genus, but considered too poorly known for cladistic analysis. Species assigned to Odontopleura ( Odontopleura ) include Odontopleura ovata Emmrich, Odontopleura brevigena Chatterton and Perry, Odontopleura ( Odontopleura ) arctica n. sp., and Diacanthaspis serotina Apollonov. Species assigned to Sinespinaspis n. subgen. include Taemasaspis llandoveryana Šnajdr, Odontopleura greenwoodi Chatterton and Perry, Odontopleura maccallai Chatterton and Perry, and Odontopleura nehedensis Chatterton and Perry. Odontopleura bombini Chatterton and Perry is tentatively placed in synonymy with Odontopleura nehedensis . The genus had a wide distribution throughout the Early and Middle Silurian, due to preferences for deep-water, distal shelf or shelf-slope transition zone habitats. |
format |
Article in Journal/Newspaper |
author |
Adrain, Jonathan M. Chatterton, Brian D. E. |
author_facet |
Adrain, Jonathan M. Chatterton, Brian D. E. |
author_sort |
Adrain, Jonathan M. |
title |
Odontopleura (Trilobita, Silurian), and a method of constrained congruency analysis |
title_short |
Odontopleura (Trilobita, Silurian), and a method of constrained congruency analysis |
title_full |
Odontopleura (Trilobita, Silurian), and a method of constrained congruency analysis |
title_fullStr |
Odontopleura (Trilobita, Silurian), and a method of constrained congruency analysis |
title_full_unstemmed |
Odontopleura (Trilobita, Silurian), and a method of constrained congruency analysis |
title_sort |
odontopleura (trilobita, silurian), and a method of constrained congruency analysis |
publisher |
Cambridge University Press (CUP) |
publishDate |
1990 |
url |
http://dx.doi.org/10.1017/s0022336000042645 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022336000042645 |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
Journal of Paleontology volume 64, issue 4, page 600-614 ISSN 0022-3360 1937-2337 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0022336000042645 |
container_title |
Journal of Paleontology |
container_volume |
64 |
container_issue |
4 |
container_start_page |
600 |
op_container_end_page |
614 |
_version_ |
1797578645415395328 |