Constructional morphology of the shell/ligament system in opisthogyrate rostrate bivalves

Autores
Echevarría, Javier; Damborenea, Susana Ester; Manceñido, Miguel Oscar
Año de publicación
2017
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The bivalve ligament provides the thrust for shell opening, acting as the resistance in a lever system against which adductor muscle effort is applied. Usually, its outer lamellar layer is subjected to tensile stress, while the inner fibrous layer is compressed, with the pivotal axis located between them. However, opisthogyrate rostrate bivalves display a concave dorsal margin, and both the umbo and the postero-dorsal angle of the shell project dorsally to the ligament, which then fails to act as pivotal axis. Three opisthogyrate rostrate genera of unrelated lineages show somewhat different solutions to this morpho-functional challenge. In Cuspidaria (Anomalodesmata), the ligament is internal, subjected only to compression and ventral to the pivotal axis, a thickened periostracum develops, forcing the dorsal margins of the valves to act as pivotal axis, and the posterior parts of the shell’s dorsal margins gape dorsally. In Nuculana (Palaeotaxodonta), the inner layer of the ligament is internal, the outer layer is external but reduced, and some species develop a dorsal ridge parallel to the commissural plane, on a level with the rostrum and acting as pivotal axis. In Pterotrigonia (Palaeoheterodonta) and other rostrate trigoniides, the ligament is external opisthodetic, but is allometrically reduced. Trigoniides may also develop a dorsal ridge.
Facultad de Ciencias Naturales y Museo
Materia
Biología
Ciencias Naturales
Allometry
Anomalodesmata
Bivalvia
Concave dorsal margin
Functional morphology
Nuculanida
Palaeoheterodonta
Palaeotaxodonta
Poromyida
Trigoniida
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by-nc-sa/4.0/
Repositorio
SEDICI (UNLP)
Institución
Universidad Nacional de La Plata
OAI Identificador
oai:sedici.unlp.edu.ar:10915/103497

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repository_id_str 1329
network_name_str SEDICI (UNLP)
spelling Constructional morphology of the shell/ligament system in opisthogyrate rostrate bivalvesEchevarría, JavierDamborenea, Susana EsterManceñido, Miguel OscarBiologíaCiencias NaturalesAllometryAnomalodesmataBivalviaConcave dorsal marginFunctional morphologyNuculanidaPalaeoheterodontaPalaeotaxodontaPoromyidaTrigoniidaThe bivalve ligament provides the thrust for shell opening, acting as the resistance in a lever system against which adductor muscle effort is applied. Usually, its outer lamellar layer is subjected to tensile stress, while the inner fibrous layer is compressed, with the pivotal axis located between them. However, opisthogyrate rostrate bivalves display a concave dorsal margin, and both the umbo and the postero-dorsal angle of the shell project dorsally to the ligament, which then fails to act as pivotal axis. Three opisthogyrate rostrate genera of unrelated lineages show somewhat different solutions to this morpho-functional challenge. In Cuspidaria (Anomalodesmata), the ligament is internal, subjected only to compression and ventral to the pivotal axis, a thickened periostracum develops, forcing the dorsal margins of the valves to act as pivotal axis, and the posterior parts of the shell’s dorsal margins gape dorsally. In Nuculana (Palaeotaxodonta), the inner layer of the ligament is internal, the outer layer is external but reduced, and some species develop a dorsal ridge parallel to the commissural plane, on a level with the rostrum and acting as pivotal axis. In Pterotrigonia (Palaeoheterodonta) and other rostrate trigoniides, the ligament is external opisthodetic, but is allometrically reduced. Trigoniides may also develop a dorsal ridge.Facultad de Ciencias Naturales y Museo2017info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdf221-227http://sedici.unlp.edu.ar/handle/10915/103497enginfo:eu-repo/semantics/altIdentifier/issn/1755-6929info:eu-repo/semantics/altIdentifier/doi/10.1017/s1755691016000219info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-sa/4.0/Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-09-29T11:22:28Zoai:sedici.unlp.edu.ar:10915/103497Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 11:22:29.224SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv Constructional morphology of the shell/ligament system in opisthogyrate rostrate bivalves
title Constructional morphology of the shell/ligament system in opisthogyrate rostrate bivalves
spellingShingle Constructional morphology of the shell/ligament system in opisthogyrate rostrate bivalves
Echevarría, Javier
Biología
Ciencias Naturales
Allometry
Anomalodesmata
Bivalvia
Concave dorsal margin
Functional morphology
Nuculanida
Palaeoheterodonta
Palaeotaxodonta
Poromyida
Trigoniida
title_short Constructional morphology of the shell/ligament system in opisthogyrate rostrate bivalves
title_full Constructional morphology of the shell/ligament system in opisthogyrate rostrate bivalves
title_fullStr Constructional morphology of the shell/ligament system in opisthogyrate rostrate bivalves
title_full_unstemmed Constructional morphology of the shell/ligament system in opisthogyrate rostrate bivalves
title_sort Constructional morphology of the shell/ligament system in opisthogyrate rostrate bivalves
dc.creator.none.fl_str_mv Echevarría, Javier
Damborenea, Susana Ester
Manceñido, Miguel Oscar
author Echevarría, Javier
author_facet Echevarría, Javier
Damborenea, Susana Ester
Manceñido, Miguel Oscar
author_role author
author2 Damborenea, Susana Ester
Manceñido, Miguel Oscar
author2_role author
author
dc.subject.none.fl_str_mv Biología
Ciencias Naturales
Allometry
Anomalodesmata
Bivalvia
Concave dorsal margin
Functional morphology
Nuculanida
Palaeoheterodonta
Palaeotaxodonta
Poromyida
Trigoniida
topic Biología
Ciencias Naturales
Allometry
Anomalodesmata
Bivalvia
Concave dorsal margin
Functional morphology
Nuculanida
Palaeoheterodonta
Palaeotaxodonta
Poromyida
Trigoniida
dc.description.none.fl_txt_mv The bivalve ligament provides the thrust for shell opening, acting as the resistance in a lever system against which adductor muscle effort is applied. Usually, its outer lamellar layer is subjected to tensile stress, while the inner fibrous layer is compressed, with the pivotal axis located between them. However, opisthogyrate rostrate bivalves display a concave dorsal margin, and both the umbo and the postero-dorsal angle of the shell project dorsally to the ligament, which then fails to act as pivotal axis. Three opisthogyrate rostrate genera of unrelated lineages show somewhat different solutions to this morpho-functional challenge. In Cuspidaria (Anomalodesmata), the ligament is internal, subjected only to compression and ventral to the pivotal axis, a thickened periostracum develops, forcing the dorsal margins of the valves to act as pivotal axis, and the posterior parts of the shell’s dorsal margins gape dorsally. In Nuculana (Palaeotaxodonta), the inner layer of the ligament is internal, the outer layer is external but reduced, and some species develop a dorsal ridge parallel to the commissural plane, on a level with the rostrum and acting as pivotal axis. In Pterotrigonia (Palaeoheterodonta) and other rostrate trigoniides, the ligament is external opisthodetic, but is allometrically reduced. Trigoniides may also develop a dorsal ridge.
Facultad de Ciencias Naturales y Museo
description The bivalve ligament provides the thrust for shell opening, acting as the resistance in a lever system against which adductor muscle effort is applied. Usually, its outer lamellar layer is subjected to tensile stress, while the inner fibrous layer is compressed, with the pivotal axis located between them. However, opisthogyrate rostrate bivalves display a concave dorsal margin, and both the umbo and the postero-dorsal angle of the shell project dorsally to the ligament, which then fails to act as pivotal axis. Three opisthogyrate rostrate genera of unrelated lineages show somewhat different solutions to this morpho-functional challenge. In Cuspidaria (Anomalodesmata), the ligament is internal, subjected only to compression and ventral to the pivotal axis, a thickened periostracum develops, forcing the dorsal margins of the valves to act as pivotal axis, and the posterior parts of the shell’s dorsal margins gape dorsally. In Nuculana (Palaeotaxodonta), the inner layer of the ligament is internal, the outer layer is external but reduced, and some species develop a dorsal ridge parallel to the commissural plane, on a level with the rostrum and acting as pivotal axis. In Pterotrigonia (Palaeoheterodonta) and other rostrate trigoniides, the ligament is external opisthodetic, but is allometrically reduced. Trigoniides may also develop a dorsal ridge.
publishDate 2017
dc.date.none.fl_str_mv 2017
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Articulo
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info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://sedici.unlp.edu.ar/handle/10915/103497
url http://sedici.unlp.edu.ar/handle/10915/103497
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/issn/1755-6929
info:eu-repo/semantics/altIdentifier/doi/10.1017/s1755691016000219
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
dc.format.none.fl_str_mv application/pdf
221-227
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