A new Cambrian stem-group echinoderm reveals the evolution of the anteroposterior axis

[EN] Echinoderms are among the most morphologically distinctive animal phyla, encompassing familiar forms like starfish and sea urchins. Uncovering how their unique pentaradial body plan evolved from a bilaterally symmetrical ancestor has long proved challenging, as this involved fundamental changes...

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Autores: Woodgate, Stephanie C., Dunn, Frances, Thompson, Jeffrey R., Formery, Laurent, Zamora Iranzo, Samuel Andrés, Rahman, Imran A.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2025
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/399641
Acceso en línea:http://hdl.handle.net/10261/399641
https://api.elsevier.com/content/abstract/scopus_id/105009166991
Access Level:acceso abierto
Palabra clave:Phylogeny
Cambrian
Anteroposterior axis
Ctenocystoids
Echinoderms
Evolution
Paleobiology
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spelling A new Cambrian stem-group echinoderm reveals the evolution of the anteroposterior axisWoodgate, Stephanie C.Dunn, FrancesThompson, Jeffrey R.Formery, LaurentZamora Iranzo, Samuel AndrésRahman, Imran A.PhylogenyCambrianAnteroposterior axisCtenocystoidsEchinodermsEvolutionPaleobiology[EN] Echinoderms are among the most morphologically distinctive animal phyla, encompassing familiar forms like starfish and sea urchins. Uncovering how their unique pentaradial body plan evolved from a bilaterally symmetrical ancestor has long proved challenging, as this involved fundamental changes to adult morphology and body plan development, associated with a complete reorganization of the anteroposterior (A-P) axis,1,2,3 obfuscating homologies between disparate groups.4,5 This has greatly limited our understanding of one of the most radical transformations in bilaterian evolutionary history.6,7,8 Here, we describe a new bilaterally symmetrical echinoderm, Atlascystis acantha, from the Cambrian of Morocco.9 This is the oldest bilaterally symmetrical echinoderm and the first with this body plan known from different ontogenetic stages, allowing us to elucidate mechanisms of its growth. This demonstrates that Atlascystis possessed ambulacra-structures accommodating extensions of the characteristic echinoderm water vascular system-providing a clear point of homology between Atlascystis and radially symmetrical forms. By integrating the Cambrian fossil record and our new phylogeny with developmental biology,10 we uncover how changes to the ancestral bilaterian A-P patterning network alongside stepwise morphological transformations gave rise to the pentaradial structure of extant echinoderms, transforming our understanding of the origin and earliest evolution of this major animal phylum.We thank National Geographic for funding fieldwork and Andrew Smith and Tim Ewin for assistance collecting specimens. F.S.D. acknowledges support from the Natural Environment Research Council (NE/W00786X/1). J.T. was supported by a Leverhulme Trust Early Career Fellowship. S.Z. acknowledges support from the Spanish Ministry of Science and Innovation (PID2021-125585NB-I00), co-financed by the European Regional Development Fund, and the project “Aragosaurus: Recursos Geológicos y Paleoambientales” (E18_17R) funded by the Government of Aragón.Peer reviewedCell PressElsevierNational Geographic SocietyNatural Environment Research Council (UK)Leverhulme TrustMinisterio de Ciencia e Innovación (España)European CommissionGobierno de AragónZamora Iranzo, Samuel Andrés [0000-0002-3917-4628]Rahman, Imran A. [0000-0001-6598-6534]Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202520252025info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionapplication/pdfhttp://hdl.handle.net/10261/399641https://api.elsevier.com/content/abstract/scopus_id/105009166991reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2021-2023/PID2021-125585NB-I00https://doi.org/10.1016/j.cub.2025.05.065Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/3996412026-05-22T06:33:51Z
dc.title.none.fl_str_mv A new Cambrian stem-group echinoderm reveals the evolution of the anteroposterior axis
title A new Cambrian stem-group echinoderm reveals the evolution of the anteroposterior axis
spellingShingle A new Cambrian stem-group echinoderm reveals the evolution of the anteroposterior axis
Woodgate, Stephanie C.
Phylogeny
Cambrian
Anteroposterior axis
Ctenocystoids
Echinoderms
Evolution
Paleobiology
title_short A new Cambrian stem-group echinoderm reveals the evolution of the anteroposterior axis
title_full A new Cambrian stem-group echinoderm reveals the evolution of the anteroposterior axis
title_fullStr A new Cambrian stem-group echinoderm reveals the evolution of the anteroposterior axis
title_full_unstemmed A new Cambrian stem-group echinoderm reveals the evolution of the anteroposterior axis
title_sort A new Cambrian stem-group echinoderm reveals the evolution of the anteroposterior axis
dc.creator.none.fl_str_mv Woodgate, Stephanie C.
Dunn, Frances
Thompson, Jeffrey R.
Formery, Laurent
Zamora Iranzo, Samuel Andrés
Rahman, Imran A.
author Woodgate, Stephanie C.
author_facet Woodgate, Stephanie C.
Dunn, Frances
Thompson, Jeffrey R.
Formery, Laurent
Zamora Iranzo, Samuel Andrés
Rahman, Imran A.
author_role author
author2 Dunn, Frances
Thompson, Jeffrey R.
Formery, Laurent
Zamora Iranzo, Samuel Andrés
Rahman, Imran A.
author2_role author
author
author
author
author
dc.contributor.none.fl_str_mv National Geographic Society
Natural Environment Research Council (UK)
Leverhulme Trust
Ministerio de Ciencia e Innovación (España)
European Commission
Gobierno de Aragón
Zamora Iranzo, Samuel Andrés [0000-0002-3917-4628]
Rahman, Imran A. [0000-0001-6598-6534]
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Phylogeny
Cambrian
Anteroposterior axis
Ctenocystoids
Echinoderms
Evolution
Paleobiology
topic Phylogeny
Cambrian
Anteroposterior axis
Ctenocystoids
Echinoderms
Evolution
Paleobiology
description [EN] Echinoderms are among the most morphologically distinctive animal phyla, encompassing familiar forms like starfish and sea urchins. Uncovering how their unique pentaradial body plan evolved from a bilaterally symmetrical ancestor has long proved challenging, as this involved fundamental changes to adult morphology and body plan development, associated with a complete reorganization of the anteroposterior (A-P) axis,1,2,3 obfuscating homologies between disparate groups.4,5 This has greatly limited our understanding of one of the most radical transformations in bilaterian evolutionary history.6,7,8 Here, we describe a new bilaterally symmetrical echinoderm, Atlascystis acantha, from the Cambrian of Morocco.9 This is the oldest bilaterally symmetrical echinoderm and the first with this body plan known from different ontogenetic stages, allowing us to elucidate mechanisms of its growth. This demonstrates that Atlascystis possessed ambulacra-structures accommodating extensions of the characteristic echinoderm water vascular system-providing a clear point of homology between Atlascystis and radially symmetrical forms. By integrating the Cambrian fossil record and our new phylogeny with developmental biology,10 we uncover how changes to the ancestral bilaterian A-P patterning network alongside stepwise morphological transformations gave rise to the pentaradial structure of extant echinoderms, transforming our understanding of the origin and earliest evolution of this major animal phylum.
publishDate 2025
dc.date.none.fl_str_mv 2025
2025
2025
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/399641
https://api.elsevier.com/content/abstract/scopus_id/105009166991
url http://hdl.handle.net/10261/399641
https://api.elsevier.com/content/abstract/scopus_id/105009166991
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv #PLACEHOLDER_PARENT_METADATA_VALUE#
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2021-2023/PID2021-125585NB-I00
https://doi.org/10.1016/j.cub.2025.05.065
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Cell Press
Elsevier
publisher.none.fl_str_mv Cell Press
Elsevier
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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