Description of Aetostreon pilmatuegrossum sp. nov. from the Lower Cretaceous of Argentina (Neuquén Basin), and significance of the conservative left valve morphology in oysters of the genus Aetostreon Bayle

Aetostreon pilmatuegrossum sp. nov., a large and very convex ostreid from the Pilmatué Member of the Agrio Formation (Neuquén Basin, Argentina), is described based on specimens recovered from upper Valanginian beds of the Pseudofavrella angulatiformis and Neocomites sp. ammonite subzones. This work...

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Detalles Bibliográficos
Publicado:	2009
Materias:	Aetostreon Argentina Lower Cretaceous Neuquén Basin Ostreoidea Taxonomy anatomy Cretaceous developmental stage growth mollusc morphology species occurrence taxonomy Africa Neuquen Basin South Africa South America Southern Africa Sub-Saharan Africa Ammonoidea Ostreidae Pseudofavrella angulatiformis
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01956671_v30_n3_p727_Rubilar http://hdl.handle.net/20.500.12110/paper_01956671_v30_n3_p727_Rubilar
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_01956671_v30_n3_p727_Rubilar
record_format	dspace
spelling	paper:paper_01956671_v30_n3_p727_Rubilar2023-06-08T15:20:12Z Description of Aetostreon pilmatuegrossum sp. nov. from the Lower Cretaceous of Argentina (Neuquén Basin), and significance of the conservative left valve morphology in oysters of the genus Aetostreon Bayle Aetostreon Argentina Lower Cretaceous Neuquén Basin Ostreoidea Taxonomy anatomy Cretaceous developmental stage growth mollusc morphology species occurrence taxonomy Africa Argentina Neuquen Basin South Africa South America Southern Africa Sub-Saharan Africa Ammonoidea Ostreidae Ostreoidea Pseudofavrella angulatiformis Aetostreon pilmatuegrossum sp. nov., a large and very convex ostreid from the Pilmatué Member of the Agrio Formation (Neuquén Basin, Argentina), is described based on specimens recovered from upper Valanginian beds of the Pseudofavrella angulatiformis and Neocomites sp. ammonite subzones. This work also includes a general morphologic discussion of the well-known Lower Cretaceous oysters from Europe, Asia and Africa, most of them considered synonymous of Aetostreon latissimum (Lamarck) in the last decades. The left valves of these oysters share a set of morphological characters that seems to respond to a very distinct but conservative anatomical pattern inherited from their direct ancestor, instead of evidence for their taxonomic uniformity at the species level. Specifically, they show differences in several characters and/or their degree of development and co-occurrence in a particular growth stage, which probably have systematic value, as in the species here described. Aetostreon pilmatuegrossum sp. nov. is probable closely related to an undescribed lower Valanginian species recorded in the Chachao Formation of the Neuquén Basin, and also has affinities with an association of Barremian oysters from South Africa that seems to be its direct descendant. © 2009 Elsevier Ltd. All rights reserved. 2009 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01956671_v30_n3_p727_Rubilar http://hdl.handle.net/20.500.12110/paper_01956671_v30_n3_p727_Rubilar
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Aetostreon Argentina Lower Cretaceous Neuquén Basin Ostreoidea Taxonomy anatomy Cretaceous developmental stage growth mollusc morphology species occurrence taxonomy Africa Argentina Neuquen Basin South Africa South America Southern Africa Sub-Saharan Africa Ammonoidea Ostreidae Ostreoidea Pseudofavrella angulatiformis
spellingShingle	Aetostreon Argentina Lower Cretaceous Neuquén Basin Ostreoidea Taxonomy anatomy Cretaceous developmental stage growth mollusc morphology species occurrence taxonomy Africa Argentina Neuquen Basin South Africa South America Southern Africa Sub-Saharan Africa Ammonoidea Ostreidae Ostreoidea Pseudofavrella angulatiformis Description of Aetostreon pilmatuegrossum sp. nov. from the Lower Cretaceous of Argentina (Neuquén Basin), and significance of the conservative left valve morphology in oysters of the genus Aetostreon Bayle
topic_facet	Aetostreon Argentina Lower Cretaceous Neuquén Basin Ostreoidea Taxonomy anatomy Cretaceous developmental stage growth mollusc morphology species occurrence taxonomy Africa Argentina Neuquen Basin South Africa South America Southern Africa Sub-Saharan Africa Ammonoidea Ostreidae Ostreoidea Pseudofavrella angulatiformis
description	Aetostreon pilmatuegrossum sp. nov., a large and very convex ostreid from the Pilmatué Member of the Agrio Formation (Neuquén Basin, Argentina), is described based on specimens recovered from upper Valanginian beds of the Pseudofavrella angulatiformis and Neocomites sp. ammonite subzones. This work also includes a general morphologic discussion of the well-known Lower Cretaceous oysters from Europe, Asia and Africa, most of them considered synonymous of Aetostreon latissimum (Lamarck) in the last decades. The left valves of these oysters share a set of morphological characters that seems to respond to a very distinct but conservative anatomical pattern inherited from their direct ancestor, instead of evidence for their taxonomic uniformity at the species level. Specifically, they show differences in several characters and/or their degree of development and co-occurrence in a particular growth stage, which probably have systematic value, as in the species here described. Aetostreon pilmatuegrossum sp. nov. is probable closely related to an undescribed lower Valanginian species recorded in the Chachao Formation of the Neuquén Basin, and also has affinities with an association of Barremian oysters from South Africa that seems to be its direct descendant. © 2009 Elsevier Ltd. All rights reserved.
title	Description of Aetostreon pilmatuegrossum sp. nov. from the Lower Cretaceous of Argentina (Neuquén Basin), and significance of the conservative left valve morphology in oysters of the genus Aetostreon Bayle
title_short	Description of Aetostreon pilmatuegrossum sp. nov. from the Lower Cretaceous of Argentina (Neuquén Basin), and significance of the conservative left valve morphology in oysters of the genus Aetostreon Bayle
title_full	Description of Aetostreon pilmatuegrossum sp. nov. from the Lower Cretaceous of Argentina (Neuquén Basin), and significance of the conservative left valve morphology in oysters of the genus Aetostreon Bayle
title_fullStr	Description of Aetostreon pilmatuegrossum sp. nov. from the Lower Cretaceous of Argentina (Neuquén Basin), and significance of the conservative left valve morphology in oysters of the genus Aetostreon Bayle
title_full_unstemmed	Description of Aetostreon pilmatuegrossum sp. nov. from the Lower Cretaceous of Argentina (Neuquén Basin), and significance of the conservative left valve morphology in oysters of the genus Aetostreon Bayle
title_sort	description of aetostreon pilmatuegrossum sp. nov. from the lower cretaceous of argentina (neuquén basin), and significance of the conservative left valve morphology in oysters of the genus aetostreon bayle
publishDate	2009
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01956671_v30_n3_p727_Rubilar http://hdl.handle.net/20.500.12110/paper_01956671_v30_n3_p727_Rubilar
_version_	1768544036523606016

Description of Aetostreon pilmatuegrossum sp. nov. from the Lower Cretaceous of Argentina (Neuquén Basin), and significance of the conservative left valve morphology in oysters of the genus Aetostreon Bayle

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