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
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/23788
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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 Técnicas2025-09-29T10:27:17Zoai: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:34982025-09-29 10:27:18.238CONICET 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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1844614275487760384 |
score |
13.070432 |