Modified basal elements in Dicroidium fronds (Corystospermales)

Autores
Bomfleur, Benjamin; Escapa, Ignacio Hernán; Taylor, Edith L.; Taylor, Thomas N.
Año de publicación
2012
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
We describe a distinct type of heteromorphic basal frond element in four species of the seed-fern foliage Dicroidium, based principally on a survey of plant-fossil collections from the Triassic of Antarctica. The modified foliar elements are conspicuously enlarged, and arise at wide angles and obliquely to the frond plane. Those of D. elongatum and D. crassinerve arise more or less directly from the petiole base; they are overall wedge- to fan-shaped with variably dissected margins and fan-shaped venation. Those of D. odontopteroides and D. dubium are (sub)circular, reniform, or obcordate, also with fan-shaped venation, or divided into narrow tongue-shaped segments with alethopteroid venation. The basal elements of some species commonly occur isolated. By analogy with comparable structures among other plant groups, we conclude that the basal elements represent a distinct, early leaf-ontogenetic architectural unit in the frond bauplan of Dicroidium, which provides an important additional character for a more accurate delimitation and systematic classification. Similar structures also occur on the corystosperm reproductive organs Umkomasia and Pteruchus. It appears that the basal elements were particularly common among high-latitude Dicroidium trees that flourished in a strongly seasonal light regime. We hypothesize that the modified elements may represent the initial foliar outgrowths during spring flush, ensuring a rapid re-initiation of sap flow and metabolic activity after the extended period of winter dormancy.
Fil: Bomfleur, Benjamin. University of Kansas; Estados Unidos
Fil: Escapa, Ignacio Hernán. Museo Paleontológico Egidio Feruglio; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Taylor, Edith L.. University of Kansas; Estados Unidos
Fil: Taylor, Thomas N.. University of Kansas; Estados Unidos
Materia
Cyclopterid
Aphlebia
Stipule
Organography
Taxonomy
Palaoecology
Seed Ferns
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:11336/23788
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/23788
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Modified basal elements in Dicroidium fronds (Corystospermales)Bomfleur, BenjaminEscapa, Ignacio HernánTaylor, Edith L.Taylor, Thomas N.CyclopteridAphlebiaStipuleOrganographyTaxonomyPalaoecologySeed Fernshttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1We describe a distinct type of heteromorphic basal frond element in four species of the seed-fern foliage Dicroidium, based principally on a survey of plant-fossil collections from the Triassic of Antarctica. The modified foliar elements are conspicuously enlarged, and arise at wide angles and obliquely to the frond plane. Those of D. elongatum and D. crassinerve arise more or less directly from the petiole base; they are overall wedge- to fan-shaped with variably dissected margins and fan-shaped venation. Those of D. odontopteroides and D. dubium are (sub)circular, reniform, or obcordate, also with fan-shaped venation, or divided into narrow tongue-shaped segments with alethopteroid venation. The basal elements of some species commonly occur isolated. By analogy with comparable structures among other plant groups, we conclude that the basal elements represent a distinct, early leaf-ontogenetic architectural unit in the frond bauplan of Dicroidium, which provides an important additional character for a more accurate delimitation and systematic classification. Similar structures also occur on the corystosperm reproductive organs Umkomasia and Pteruchus. It appears that the basal elements were particularly common among high-latitude Dicroidium trees that flourished in a strongly seasonal light regime. We hypothesize that the modified elements may represent the initial foliar outgrowths during spring flush, ensuring a rapid re-initiation of sap flow and metabolic activity after the extended period of winter dormancy.Fil: Bomfleur, Benjamin. University of Kansas; Estados UnidosFil: Escapa, Ignacio Hernán. Museo Paleontológico Egidio Feruglio; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Taylor, Edith L.. University of Kansas; Estados UnidosFil: Taylor, Thomas N.. University of Kansas; Estados UnidosElsevier2012-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/23788Bomfleur, Benjamin; Escapa, Ignacio Hernán; Taylor, Edith L.; Taylor, Thomas N.; Modified basal elements in Dicroidium fronds (Corystospermales); Elsevier; Review of Palaeobotany and Palynology; 170; 1-2012; 15-260034-6667CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S003466671100176Xinfo:eu-repo/semantics/altIdentifier/doi/10.1016/j.revpalbo.2011.10.012info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-10-22T11:59:50Zoai:ri.conicet.gov.ar:11336/23788instacron: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:34982025-10-22 11:59:50.536CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Modified basal elements in Dicroidium fronds (Corystospermales)
title Modified basal elements in Dicroidium fronds (Corystospermales)
spellingShingle Modified basal elements in Dicroidium fronds (Corystospermales)
Bomfleur, Benjamin
Cyclopterid
Aphlebia
Stipule
Organography
Taxonomy
Palaoecology
Seed Ferns
title_short Modified basal elements in Dicroidium fronds (Corystospermales)
title_full Modified basal elements in Dicroidium fronds (Corystospermales)
title_fullStr Modified basal elements in Dicroidium fronds (Corystospermales)
title_full_unstemmed Modified basal elements in Dicroidium fronds (Corystospermales)
title_sort Modified basal elements in Dicroidium fronds (Corystospermales)
dc.creator.none.fl_str_mv Bomfleur, Benjamin
Escapa, Ignacio Hernán
Taylor, Edith L.
Taylor, Thomas N.
author Bomfleur, Benjamin
author_facet Bomfleur, Benjamin
Escapa, Ignacio Hernán
Taylor, Edith L.
Taylor, Thomas N.
author_role author
author2 Escapa, Ignacio Hernán
Taylor, Edith L.
Taylor, Thomas N.
author2_role author
author
author
dc.subject.none.fl_str_mv Cyclopterid
Aphlebia
Stipule
Organography
Taxonomy
Palaoecology
Seed Ferns
topic Cyclopterid
Aphlebia
Stipule
Organography
Taxonomy
Palaoecology
Seed Ferns
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv We describe a distinct type of heteromorphic basal frond element in four species of the seed-fern foliage Dicroidium, based principally on a survey of plant-fossil collections from the Triassic of Antarctica. The modified foliar elements are conspicuously enlarged, and arise at wide angles and obliquely to the frond plane. Those of D. elongatum and D. crassinerve arise more or less directly from the petiole base; they are overall wedge- to fan-shaped with variably dissected margins and fan-shaped venation. Those of D. odontopteroides and D. dubium are (sub)circular, reniform, or obcordate, also with fan-shaped venation, or divided into narrow tongue-shaped segments with alethopteroid venation. The basal elements of some species commonly occur isolated. By analogy with comparable structures among other plant groups, we conclude that the basal elements represent a distinct, early leaf-ontogenetic architectural unit in the frond bauplan of Dicroidium, which provides an important additional character for a more accurate delimitation and systematic classification. Similar structures also occur on the corystosperm reproductive organs Umkomasia and Pteruchus. It appears that the basal elements were particularly common among high-latitude Dicroidium trees that flourished in a strongly seasonal light regime. We hypothesize that the modified elements may represent the initial foliar outgrowths during spring flush, ensuring a rapid re-initiation of sap flow and metabolic activity after the extended period of winter dormancy.
Fil: Bomfleur, Benjamin. University of Kansas; Estados Unidos
Fil: Escapa, Ignacio Hernán. Museo Paleontológico Egidio Feruglio; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Taylor, Edith L.. University of Kansas; Estados Unidos
Fil: Taylor, Thomas N.. University of Kansas; Estados Unidos
description We describe a distinct type of heteromorphic basal frond element in four species of the seed-fern foliage Dicroidium, based principally on a survey of plant-fossil collections from the Triassic of Antarctica. The modified foliar elements are conspicuously enlarged, and arise at wide angles and obliquely to the frond plane. Those of D. elongatum and D. crassinerve arise more or less directly from the petiole base; they are overall wedge- to fan-shaped with variably dissected margins and fan-shaped venation. Those of D. odontopteroides and D. dubium are (sub)circular, reniform, or obcordate, also with fan-shaped venation, or divided into narrow tongue-shaped segments with alethopteroid venation. The basal elements of some species commonly occur isolated. By analogy with comparable structures among other plant groups, we conclude that the basal elements represent a distinct, early leaf-ontogenetic architectural unit in the frond bauplan of Dicroidium, which provides an important additional character for a more accurate delimitation and systematic classification. Similar structures also occur on the corystosperm reproductive organs Umkomasia and Pteruchus. It appears that the basal elements were particularly common among high-latitude Dicroidium trees that flourished in a strongly seasonal light regime. We hypothesize that the modified elements may represent the initial foliar outgrowths during spring flush, ensuring a rapid re-initiation of sap flow and metabolic activity after the extended period of winter dormancy.
publishDate 2012
dc.date.none.fl_str_mv 2012-01
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/11336/23788
Bomfleur, Benjamin; Escapa, Ignacio Hernán; Taylor, Edith L.; Taylor, Thomas N.; Modified basal elements in Dicroidium fronds (Corystospermales); Elsevier; Review of Palaeobotany and Palynology; 170; 1-2012; 15-26
0034-6667
CONICET Digital
CONICET
url http://hdl.handle.net/11336/23788
identifier_str_mv Bomfleur, Benjamin; Escapa, Ignacio Hernán; Taylor, Edith L.; Taylor, Thomas N.; Modified basal elements in Dicroidium fronds (Corystospermales); Elsevier; Review of Palaeobotany and Palynology; 170; 1-2012; 15-26
0034-6667
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S003466671100176X
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.revpalbo.2011.10.012
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 Elsevier
publisher.none.fl_str_mv Elsevier
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 12.982451

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