A new genus of Late Cretaceous cycad stem from Argentina, with reappraisal of known forms

Autores
Artabe, Analia Emilia Eva; Zamuner, Alba Berta; Stevenson, Dennis W.
Año de publicación
2005
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
An anatomically preserved mature cycadalean stem from Allen Formation (Late Cretaceous) at the Bajo de Santa Rosa locality, Río Negro Province, Argentina, is described and assigned to Chamberlainia pteridospermoidea gen. nov. et sp. nov. The new taxon is characterized by centrifugal and centripetal polyxyly, medullary vascular bundles, mucilage canals and concentric extraxylary bundles. Amongthe Encephalartoideae, the Tribe Encephalarteae is characterized by the présence of centripetal polyxyly, medullary vascular bundles and extrafascicular vascular bundles. Fossil stems of the Encephalarteae are: Fascivarioxylon, Chamberlainia, Worsdellia, and Menucoa. Lyssoxylon and Brunoa characterize the Tribe Diooeae with a lack of centripetal xylem and absence of medullary vascular bundles; the tribe appeared simultaneously in the Triassic of western Laurasia (Lyssoxylon) and southwestern Gondwana (Micheliilloa). In South America, the groupdisappeared after the Cenozoic (Bororoa), whilein North and Central America it remains as an endemie (Dioon). The Encephalarteae emerged in the Triassic of western Laurasia (Charmorgia). In Gondwana, the Tribeis foundin the Jurassic of India (Fascivarioxylon), the Cretaceous of Antarctica (Centricycas) and Argentina (Chamberlainia and Worsdellia), and the Tertiary (Menucoa) of Argentina. The Tribe remains as an extant endémie groupin southern Africa (Encephalartos) and Australia (Lepidozamia and Macrozamia).
Fil: Artabe, Analia Emilia Eva. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Área Paleobotánica; Argentina
Fil: Zamuner, Alba Berta. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Área Paleobotánica; Argentina
Fil: Stevenson, Dennis W.. New York Botanical Garden; Estados Unidos
Materia
ALLEN FORMATION
LATE CRETACEOUS
BAJO DE SANTA ROSA
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/241823
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/241823
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling A new genus of Late Cretaceous cycad stem from Argentina, with reappraisal of known formsArtabe, Analia Emilia EvaZamuner, Alba BertaStevenson, Dennis W.ALLEN FORMATIONLATE CRETACEOUSBAJO DE SANTA ROSAhttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1An anatomically preserved mature cycadalean stem from Allen Formation (Late Cretaceous) at the Bajo de Santa Rosa locality, Río Negro Province, Argentina, is described and assigned to Chamberlainia pteridospermoidea gen. nov. et sp. nov. The new taxon is characterized by centrifugal and centripetal polyxyly, medullary vascular bundles, mucilage canals and concentric extraxylary bundles. Amongthe Encephalartoideae, the Tribe Encephalarteae is characterized by the présence of centripetal polyxyly, medullary vascular bundles and extrafascicular vascular bundles. Fossil stems of the Encephalarteae are: Fascivarioxylon, Chamberlainia, Worsdellia, and Menucoa. Lyssoxylon and Brunoa characterize the Tribe Diooeae with a lack of centripetal xylem and absence of medullary vascular bundles; the tribe appeared simultaneously in the Triassic of western Laurasia (Lyssoxylon) and southwestern Gondwana (Micheliilloa). In South America, the groupdisappeared after the Cenozoic (Bororoa), whilein North and Central America it remains as an endemie (Dioon). The Encephalarteae emerged in the Triassic of western Laurasia (Charmorgia). In Gondwana, the Tribeis foundin the Jurassic of India (Fascivarioxylon), the Cretaceous of Antarctica (Centricycas) and Argentina (Chamberlainia and Worsdellia), and the Tertiary (Menucoa) of Argentina. The Tribe remains as an extant endémie groupin southern Africa (Encephalartos) and Australia (Lepidozamia and Macrozamia).Fil: Artabe, Analia Emilia Eva. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Área Paleobotánica; ArgentinaFil: Zamuner, Alba Berta. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Área Paleobotánica; ArgentinaFil: Stevenson, Dennis W.. New York Botanical Garden; Estados UnidosTaylor & Francis Ltd2005-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/241823Artabe, Analia Emilia Eva; Zamuner, Alba Berta; Stevenson, Dennis W.; A new genus of Late Cretaceous cycad stem from Argentina, with reappraisal of known forms; Taylor & Francis Ltd; Alcheringa; 29; 1; 1-2005; 87-1000311-5518CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://www.tandfonline.com/doi/abs/10.1080/03115510508619561info:eu-repo/semantics/altIdentifier/doi/10.1080/03115510508619561info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-17T10:53:11Zoai:ri.conicet.gov.ar:11336/241823instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-17 10:53:12.082CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv A new genus of Late Cretaceous cycad stem from Argentina, with reappraisal of known forms
title A new genus of Late Cretaceous cycad stem from Argentina, with reappraisal of known forms
spellingShingle A new genus of Late Cretaceous cycad stem from Argentina, with reappraisal of known forms
Artabe, Analia Emilia Eva
ALLEN FORMATION
LATE CRETACEOUS
BAJO DE SANTA ROSA
title_short A new genus of Late Cretaceous cycad stem from Argentina, with reappraisal of known forms
title_full A new genus of Late Cretaceous cycad stem from Argentina, with reappraisal of known forms
title_fullStr A new genus of Late Cretaceous cycad stem from Argentina, with reappraisal of known forms
title_full_unstemmed A new genus of Late Cretaceous cycad stem from Argentina, with reappraisal of known forms
title_sort A new genus of Late Cretaceous cycad stem from Argentina, with reappraisal of known forms
dc.creator.none.fl_str_mv Artabe, Analia Emilia Eva
Zamuner, Alba Berta
Stevenson, Dennis W.
author Artabe, Analia Emilia Eva
author_facet Artabe, Analia Emilia Eva
Zamuner, Alba Berta
Stevenson, Dennis W.
author_role author
author2 Zamuner, Alba Berta
Stevenson, Dennis W.
author2_role author
author
dc.subject.none.fl_str_mv ALLEN FORMATION
LATE CRETACEOUS
BAJO DE SANTA ROSA
topic ALLEN FORMATION
LATE CRETACEOUS
BAJO DE SANTA ROSA
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv An anatomically preserved mature cycadalean stem from Allen Formation (Late Cretaceous) at the Bajo de Santa Rosa locality, Río Negro Province, Argentina, is described and assigned to Chamberlainia pteridospermoidea gen. nov. et sp. nov. The new taxon is characterized by centrifugal and centripetal polyxyly, medullary vascular bundles, mucilage canals and concentric extraxylary bundles. Amongthe Encephalartoideae, the Tribe Encephalarteae is characterized by the présence of centripetal polyxyly, medullary vascular bundles and extrafascicular vascular bundles. Fossil stems of the Encephalarteae are: Fascivarioxylon, Chamberlainia, Worsdellia, and Menucoa. Lyssoxylon and Brunoa characterize the Tribe Diooeae with a lack of centripetal xylem and absence of medullary vascular bundles; the tribe appeared simultaneously in the Triassic of western Laurasia (Lyssoxylon) and southwestern Gondwana (Micheliilloa). In South America, the groupdisappeared after the Cenozoic (Bororoa), whilein North and Central America it remains as an endemie (Dioon). The Encephalarteae emerged in the Triassic of western Laurasia (Charmorgia). In Gondwana, the Tribeis foundin the Jurassic of India (Fascivarioxylon), the Cretaceous of Antarctica (Centricycas) and Argentina (Chamberlainia and Worsdellia), and the Tertiary (Menucoa) of Argentina. The Tribe remains as an extant endémie groupin southern Africa (Encephalartos) and Australia (Lepidozamia and Macrozamia).
Fil: Artabe, Analia Emilia Eva. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Área Paleobotánica; Argentina
Fil: Zamuner, Alba Berta. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Área Paleobotánica; Argentina
Fil: Stevenson, Dennis W.. New York Botanical Garden; Estados Unidos
description An anatomically preserved mature cycadalean stem from Allen Formation (Late Cretaceous) at the Bajo de Santa Rosa locality, Río Negro Province, Argentina, is described and assigned to Chamberlainia pteridospermoidea gen. nov. et sp. nov. The new taxon is characterized by centrifugal and centripetal polyxyly, medullary vascular bundles, mucilage canals and concentric extraxylary bundles. Amongthe Encephalartoideae, the Tribe Encephalarteae is characterized by the présence of centripetal polyxyly, medullary vascular bundles and extrafascicular vascular bundles. Fossil stems of the Encephalarteae are: Fascivarioxylon, Chamberlainia, Worsdellia, and Menucoa. Lyssoxylon and Brunoa characterize the Tribe Diooeae with a lack of centripetal xylem and absence of medullary vascular bundles; the tribe appeared simultaneously in the Triassic of western Laurasia (Lyssoxylon) and southwestern Gondwana (Micheliilloa). In South America, the groupdisappeared after the Cenozoic (Bororoa), whilein North and Central America it remains as an endemie (Dioon). The Encephalarteae emerged in the Triassic of western Laurasia (Charmorgia). In Gondwana, the Tribeis foundin the Jurassic of India (Fascivarioxylon), the Cretaceous of Antarctica (Centricycas) and Argentina (Chamberlainia and Worsdellia), and the Tertiary (Menucoa) of Argentina. The Tribe remains as an extant endémie groupin southern Africa (Encephalartos) and Australia (Lepidozamia and Macrozamia).
publishDate 2005
dc.date.none.fl_str_mv 2005-01
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
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://hdl.handle.net/11336/241823
Artabe, Analia Emilia Eva; Zamuner, Alba Berta; Stevenson, Dennis W.; A new genus of Late Cretaceous cycad stem from Argentina, with reappraisal of known forms; Taylor & Francis Ltd; Alcheringa; 29; 1; 1-2005; 87-100
0311-5518
CONICET Digital
CONICET
url http://hdl.handle.net/11336/241823
identifier_str_mv Artabe, Analia Emilia Eva; Zamuner, Alba Berta; Stevenson, Dennis W.; A new genus of Late Cretaceous cycad stem from Argentina, with reappraisal of known forms; Taylor & Francis Ltd; Alcheringa; 29; 1; 1-2005; 87-100
0311-5518
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://www.tandfonline.com/doi/abs/10.1080/03115510508619561
info:eu-repo/semantics/altIdentifier/doi/10.1080/03115510508619561
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Taylor & Francis Ltd
publisher.none.fl_str_mv Taylor & Francis Ltd
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 13.001348

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