Could the asymmetrical commissure in rhynchonellide brachiopods be an adaptive trait?

This paper presents new arguments that contribute to support the hypothesis about the functional meaning of the commissural asymmetry in the Coniacian (Upper Cretaceous) rhynchonellide Cyclothyris cardiatelia Berrocal-Casero. According to this hypothesis, commissural asymmetry is interpreted as an a...

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Detalhes bibliográficos
Autores: Berrocal Casero, Melani, García Joral, Fernando
Formato: artículo
Fecha de publicación:2023
País:España
Recursos:Universidad Complutense de Madrid (UCM)
Repositorio:Docta Complutense
Idioma:inglés
OAI Identifier:oai:docta.ucm.es:20.500.14352/73087
Acesso em linha:https://hdl.handle.net/20.500.14352/73087
Access Level:acceso abierto
Palavra-chave:564.8
Asymmetry
rhynchonellides
taphonomy
plasticity
inactive lophophore
Paleontología
2416 Paleontología
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oai_identifier_str oai:docta.ucm.es:20.500.14352/73087
network_acronym_str ES
network_name_str España
repository_id_str
spelling Could the asymmetrical commissure in rhynchonellide brachiopods be an adaptive trait?Berrocal Casero, MelaniGarcía Joral, Fernando564.8Asymmetryrhynchonellidestaphonomyplasticityinactive lophophorePaleontología2416 PaleontologíaThis paper presents new arguments that contribute to support the hypothesis about the functional meaning of the commissural asymmetry in the Coniacian (Upper Cretaceous) rhynchonellide Cyclothyris cardiatelia Berrocal-Casero. According to this hypothesis, commissural asymmetry is interpreted as an adaptation to life on soft substrates, which leads to a life position that is oblique and partially sunk in relation to the substrate. The taphonomic compression of one of the shell lobes observed in asymmetrical C. cardiatelia has been compared to the compression found in a symmetrical rhynchonellide in which the compression is located at the frontal part of the shell, supporting the idea of a different life position than in C. cardiatelia. Additionally, the fossil record shows that brachiopods exhibiting external asymmetry usually display the corresponding asymmetry in the brachidium, related to dysfunction or atrophy of one of the lophophore arms. Observations in extant rhynchonellides show they can live with one arm of the lophophore atrophied or misfunctioning, and even amputated. The applicability of this hypothesis to other cases of commissural asymmetry in rhynchonellides, such as those living in closely packed clusters, reef environments or affected by unidirectional currents, is discussed, considering that the common physiological response to these different palaeoenvironmental scenarios would be a differential use of the arms of the lophophore, in turn affecting commissure plication. This physiological response could explain the origin of obligate asymmetry in other rhynchonellide lineages besides Cyclothyris M´Coy, for instance in Torquirhynchia Childs. Continuous records of both facultative and obligate asymmetrical rhynchonellides along single phyletic lines will be necessary, in order to establish whether this interpretation is a generalized explanation for asymmetrical shells in rhynchonellides.Taylor & FrancisUniversidad Complutense de Madrid20232023-02-2120232023-02-21journal articlehttp://purl.org/coar/resource_type/c_6501info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/20.500.14352/73087reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2Atribución 3.0 Españahttps://creativecommons.org/licenses/by/3.0/es/info:eu-repo/semantics/openAccessoai:docta.ucm.es:20.500.14352/730872026-06-02T12:44:21Z
dc.title.none.fl_str_mv Could the asymmetrical commissure in rhynchonellide brachiopods be an adaptive trait?
title Could the asymmetrical commissure in rhynchonellide brachiopods be an adaptive trait?
spellingShingle Could the asymmetrical commissure in rhynchonellide brachiopods be an adaptive trait?
Berrocal Casero, Melani
564.8
Asymmetry
rhynchonellides
taphonomy
plasticity
inactive lophophore
Paleontología
2416 Paleontología
title_short Could the asymmetrical commissure in rhynchonellide brachiopods be an adaptive trait?
title_full Could the asymmetrical commissure in rhynchonellide brachiopods be an adaptive trait?
title_fullStr Could the asymmetrical commissure in rhynchonellide brachiopods be an adaptive trait?
title_full_unstemmed Could the asymmetrical commissure in rhynchonellide brachiopods be an adaptive trait?
title_sort Could the asymmetrical commissure in rhynchonellide brachiopods be an adaptive trait?
dc.creator.none.fl_str_mv Berrocal Casero, Melani
García Joral, Fernando
author Berrocal Casero, Melani
author_facet Berrocal Casero, Melani
García Joral, Fernando
author_role author
author2 García Joral, Fernando
author2_role author
dc.contributor.none.fl_str_mv Universidad Complutense de Madrid
dc.subject.none.fl_str_mv 564.8
Asymmetry
rhynchonellides
taphonomy
plasticity
inactive lophophore
Paleontología
2416 Paleontología
topic 564.8
Asymmetry
rhynchonellides
taphonomy
plasticity
inactive lophophore
Paleontología
2416 Paleontología
description This paper presents new arguments that contribute to support the hypothesis about the functional meaning of the commissural asymmetry in the Coniacian (Upper Cretaceous) rhynchonellide Cyclothyris cardiatelia Berrocal-Casero. According to this hypothesis, commissural asymmetry is interpreted as an adaptation to life on soft substrates, which leads to a life position that is oblique and partially sunk in relation to the substrate. The taphonomic compression of one of the shell lobes observed in asymmetrical C. cardiatelia has been compared to the compression found in a symmetrical rhynchonellide in which the compression is located at the frontal part of the shell, supporting the idea of a different life position than in C. cardiatelia. Additionally, the fossil record shows that brachiopods exhibiting external asymmetry usually display the corresponding asymmetry in the brachidium, related to dysfunction or atrophy of one of the lophophore arms. Observations in extant rhynchonellides show they can live with one arm of the lophophore atrophied or misfunctioning, and even amputated. The applicability of this hypothesis to other cases of commissural asymmetry in rhynchonellides, such as those living in closely packed clusters, reef environments or affected by unidirectional currents, is discussed, considering that the common physiological response to these different palaeoenvironmental scenarios would be a differential use of the arms of the lophophore, in turn affecting commissure plication. This physiological response could explain the origin of obligate asymmetry in other rhynchonellide lineages besides Cyclothyris M´Coy, for instance in Torquirhynchia Childs. Continuous records of both facultative and obligate asymmetrical rhynchonellides along single phyletic lines will be necessary, in order to establish whether this interpretation is a generalized explanation for asymmetrical shells in rhynchonellides.
publishDate 2023
dc.date.none.fl_str_mv 2023
2023-02-21
2023
2023-02-21
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/20.500.14352/73087
url https://hdl.handle.net/20.500.14352/73087
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
Atribución 3.0 España
https://creativecommons.org/licenses/by/3.0/es/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
Atribución 3.0 España
https://creativecommons.org/licenses/by/3.0/es/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Taylor & Francis
publisher.none.fl_str_mv Taylor & Francis
dc.source.none.fl_str_mv reponame:Docta Complutense
instname:Universidad Complutense de Madrid (UCM)
instname_str Universidad Complutense de Madrid (UCM)
reponame_str Docta Complutense
collection Docta Complutense
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,301603

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