The Sinemurian ammonites of the Lusitanian Basin (Portugal): an example of complex endemic evolutioin

Detalhes bibliográficos
Autor(a) principal: Dommergues, J.-L.
Data de Publicação: 2010
Outros Autores: Meister, C., Rocha, R. B.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10362/5052
Resumo: Palaeodiversity 3: 59–87; Stuttgart 30 December 2010
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spelling The Sinemurian ammonites of the Lusitanian Basin (Portugal): an example of complex endemic evolutioinAmmonitesEarly JurassicLusitanian BasinPortugalEvolutionEndemismPalaeobiogeographyPalaeodiversity 3: 59–87; Stuttgart 30 December 2010This work synthesizes all of the observations since the late nineteenth century of the highly endemic Late Sinemurian (Obtusum Chronozone) ammonite faunas of the Lusitanian Basin. It is based mainly on recent abundant collections from the Penedo da Saudade section near São Pedro de Muel (Leiria, Portugal). This rich material (some eight species and four genera), collected bed by bed, allow us to propose an initial biostratigraphic, palaebiogeographic, evolutionary and taxonomic synthesis of these mostly endemic faunas. The genus Epophioceroides (Subgen. indet. A) asteroceroides n. sp. Ptycharietites (Ptycharietites) heterogenus n. sp. So far they have been found at São Pedro de Muel only. The only non-endemic ammonite, Asteroceras sp. indet., collected from the base of the fossiliferous sequence, suggests an age in the Obtusum Chronozone for the subsequent taxa. Most probably faunas belong to the Stellare Subchronozone but taxa from the highest fossiliferous levels may also belong to the Denotatus Subchronozone. The newly collected material requires the morphological range of the genus Ptycharietites to be extended to include late forms that become either clearly evolute (subserpenticone) such as Ptycharietites (Pompeckioceras) cf. onchocephalus or clearly involute (suboxycone) such as Ptycharietites (?Subgen. indet. B) sp. indet. A. In terms of ontogeny, paedomorphosis - a rare "size-based" heterochronic process among the Asteroceratinae subfamily - is shown to be of major importance throughout the evolution of the genus Ptycharietites. In palaeobiogeographic terms all endemic Late Sinemurian (Obtusum Chronozone) ammonite faunas (Ptycharietites and Epophioceroides n gen.) of the Lusitanian Basin remain poorly understood. While they suggest marked isolation of the Lusitanian Basin and perhaps also constraining environmental conditions during the Obtusum Chronozone, there is nothing to indicate whether other bains of the "Iberai-Newfoundland" conjugate margins experienced the same endemic trend. Nor is it clear whether the Late Sinemurian endemic faunas are closely related to NW European or to W Tethyan (mediterranean) faunas. However, the earliest ammonite collected from the São Pedro de Muel section (i. e., Asteroceras sp. indet., bed 500b) suggests a possible NW European affinity.Departamento de Ciências da TerraRUNDommergues, J.-L.Meister, C.Rocha, R. B.2011-02-07T14:25:00Z2010-12-302010-12-30T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10362/5052enginfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-03-11T03:35:21Zoai:run.unl.pt:10362/5052Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T03:16:03.471082Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv The Sinemurian ammonites of the Lusitanian Basin (Portugal): an example of complex endemic evolutioin
title The Sinemurian ammonites of the Lusitanian Basin (Portugal): an example of complex endemic evolutioin
spellingShingle The Sinemurian ammonites of the Lusitanian Basin (Portugal): an example of complex endemic evolutioin
Dommergues, J.-L.
Ammonites
Early Jurassic
Lusitanian Basin
Portugal
Evolution
Endemism
Palaeobiogeography
title_short The Sinemurian ammonites of the Lusitanian Basin (Portugal): an example of complex endemic evolutioin
title_full The Sinemurian ammonites of the Lusitanian Basin (Portugal): an example of complex endemic evolutioin
title_fullStr The Sinemurian ammonites of the Lusitanian Basin (Portugal): an example of complex endemic evolutioin
title_full_unstemmed The Sinemurian ammonites of the Lusitanian Basin (Portugal): an example of complex endemic evolutioin
title_sort The Sinemurian ammonites of the Lusitanian Basin (Portugal): an example of complex endemic evolutioin
author Dommergues, J.-L.
author_facet Dommergues, J.-L.
Meister, C.
Rocha, R. B.
author_role author
author2 Meister, C.
Rocha, R. B.
author2_role author
author
dc.contributor.none.fl_str_mv RUN
dc.contributor.author.fl_str_mv Dommergues, J.-L.
Meister, C.
Rocha, R. B.
dc.subject.por.fl_str_mv Ammonites
Early Jurassic
Lusitanian Basin
Portugal
Evolution
Endemism
Palaeobiogeography
topic Ammonites
Early Jurassic
Lusitanian Basin
Portugal
Evolution
Endemism
Palaeobiogeography
description Palaeodiversity 3: 59–87; Stuttgart 30 December 2010
publishDate 2010
dc.date.none.fl_str_mv 2010-12-30
2010-12-30T00:00:00Z
2011-02-07T14:25:00Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/10362/5052
url http://hdl.handle.net/10362/5052
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.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 Departamento de Ciências da Terra
publisher.none.fl_str_mv Departamento de Ciências da Terra
dc.source.none.fl_str_mv reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron:RCAAP
instname_str Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron_str RCAAP
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reponame_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
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repository.name.fl_str_mv Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
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