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
- Institución
- Universidad Nacional de La Plata
- OAI Identificador
- oai:sedici.unlp.edu.ar:10915/103497
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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 http://purl.org/coar/resource_type/c_6501 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 |
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openAccess |
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http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) |
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