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

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...

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Detalles Bibliográficos
Autores principales:	Echevarría, Javier, Damborenea, Susana Ester, Manceñido, Miguel Oscar
Formato:	Articulo
Lenguaje:	Inglés
Publicado:	2017
Materias:	Biología Ciencias Naturales Allometry Anomalodesmata Bivalvia Concave dorsal margin Functional morphology Nuculanida Palaeoheterodonta Palaeotaxodonta Poromyida Trigoniida
Acceso en línea:	http://sedici.unlp.edu.ar/handle/10915/103497
Aporte de:	SEDICI (UNLP) de Universidad Nacional de La Plata

id	I19-R120-10915-103497
record_format	dspace
institution	Universidad Nacional de La Plata
institution_str	I-19
repository_str	R-120
collection	SEDICI (UNLP)
language	Inglés
topic	Biología Ciencias Naturales Allometry Anomalodesmata Bivalvia Concave dorsal margin Functional morphology Nuculanida Palaeoheterodonta Palaeotaxodonta Poromyida Trigoniida
spellingShingle	Biología Ciencias Naturales Allometry Anomalodesmata Bivalvia Concave dorsal margin Functional morphology Nuculanida Palaeoheterodonta Palaeotaxodonta Poromyida Trigoniida Echevarría, Javier Damborenea, Susana Ester Manceñido, Miguel Oscar Constructional morphology of the shell/ligament system in opisthogyrate rostrate bivalves
topic_facet	Biología Ciencias Naturales Allometry Anomalodesmata Bivalvia Concave dorsal margin Functional morphology Nuculanida Palaeoheterodonta Palaeotaxodonta Poromyida Trigoniida
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.
format	Articulo Articulo
author	Echevarría, Javier Damborenea, Susana Ester Manceñido, Miguel Oscar
author_facet	Echevarría, Javier Damborenea, Susana Ester Manceñido, Miguel Oscar
author_sort	Echevarría, Javier
title	Constructional morphology of the shell/ligament system in opisthogyrate rostrate bivalves
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
publishDate	2017
url	http://sedici.unlp.edu.ar/handle/10915/103497
work_keys_str_mv	AT echevarriajavier constructionalmorphologyoftheshellligamentsysteminopisthogyraterostratebivalves AT damboreneasusanaester constructionalmorphologyoftheshellligamentsysteminopisthogyraterostratebivalves AT mancenidomigueloscar constructionalmorphologyoftheshellligamentsysteminopisthogyraterostratebivalves
bdutipo_str	Repositorios
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Constructional morphology of the shell/ligament system in opisthogyrate rostrate bivalves

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