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The trilobite upper limb branch is a well-developed gill
Whether the upper limb branch of Paleozoic “biramous” arthropods, including trilobites, served a respiratory function has been much debated. Here, new imaging of the trilobite Triarthrus eatoni shows that dumbbell-shaped filaments in the upper limb branch are morphologically comparable with gill str...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
American Association for the Advancement of Science
2021
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8011964/ https://www.ncbi.nlm.nih.gov/pubmed/33789898 http://dx.doi.org/10.1126/sciadv.abe7377 |
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author | Hou, Jin-bo Hughes, Nigel C. Hopkins, Melanie J. |
author_facet | Hou, Jin-bo Hughes, Nigel C. Hopkins, Melanie J. |
author_sort | Hou, Jin-bo |
collection | PubMed |
description | Whether the upper limb branch of Paleozoic “biramous” arthropods, including trilobites, served a respiratory function has been much debated. Here, new imaging of the trilobite Triarthrus eatoni shows that dumbbell-shaped filaments in the upper limb branch are morphologically comparable with gill structures in crustaceans that aerate the hemolymph. In Olenoides serratus, the upper limb’s partial articulation to the body via an extended arthrodial membrane is morphologically comparable to the junction of the respiratory book gill of Limulus and differentiates it from the typically robust exopod junction in Chelicerata or Crustacea. Apparently limited mechanical rotation of the upper branch may have protected the respiratory structures. Partial attachment of the upper branch to the body wall may represent an intermediate state in the evolution of limb branch fusion between dorsal attachment to the body wall, as in Radiodonta, and ventral fusion to the limb base, as in extant Euarthropoda. |
format | Online Article Text |
id | pubmed-8011964 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | American Association for the Advancement of Science |
record_format | MEDLINE/PubMed |
spelling | pubmed-80119642021-04-13 The trilobite upper limb branch is a well-developed gill Hou, Jin-bo Hughes, Nigel C. Hopkins, Melanie J. Sci Adv Research Articles Whether the upper limb branch of Paleozoic “biramous” arthropods, including trilobites, served a respiratory function has been much debated. Here, new imaging of the trilobite Triarthrus eatoni shows that dumbbell-shaped filaments in the upper limb branch are morphologically comparable with gill structures in crustaceans that aerate the hemolymph. In Olenoides serratus, the upper limb’s partial articulation to the body via an extended arthrodial membrane is morphologically comparable to the junction of the respiratory book gill of Limulus and differentiates it from the typically robust exopod junction in Chelicerata or Crustacea. Apparently limited mechanical rotation of the upper branch may have protected the respiratory structures. Partial attachment of the upper branch to the body wall may represent an intermediate state in the evolution of limb branch fusion between dorsal attachment to the body wall, as in Radiodonta, and ventral fusion to the limb base, as in extant Euarthropoda. American Association for the Advancement of Science 2021-03-31 /pmc/articles/PMC8011964/ /pubmed/33789898 http://dx.doi.org/10.1126/sciadv.abe7377 Text en Copyright © 2021 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC). https://creativecommons.org/licenses/by-nc/4.0/ https://creativecommons.org/licenses/by-nc/4.0/This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license (https://creativecommons.org/licenses/by-nc/4.0/) , which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited. |
spellingShingle | Research Articles Hou, Jin-bo Hughes, Nigel C. Hopkins, Melanie J. The trilobite upper limb branch is a well-developed gill |
title | The trilobite upper limb branch is a well-developed gill |
title_full | The trilobite upper limb branch is a well-developed gill |
title_fullStr | The trilobite upper limb branch is a well-developed gill |
title_full_unstemmed | The trilobite upper limb branch is a well-developed gill |
title_short | The trilobite upper limb branch is a well-developed gill |
title_sort | trilobite upper limb branch is a well-developed gill |
topic | Research Articles |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8011964/ https://www.ncbi.nlm.nih.gov/pubmed/33789898 http://dx.doi.org/10.1126/sciadv.abe7377 |
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