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dc.contributor.author
Bomfleur, Benjamin  
dc.contributor.author
Escapa, Ignacio Hernán  
dc.contributor.author
Taylor, Edith L.  
dc.contributor.author
Taylor, Thomas N.  
dc.date.available
2017-09-07T18:40:08Z  
dc.date.issued
2012-01  
dc.identifier.citation
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  
dc.identifier.issn
0034-6667  
dc.identifier.uri
http://hdl.handle.net/11336/23788  
dc.description.abstract
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.  
dc.format
application/pdf  
dc.language.iso
eng  
dc.publisher
Elsevier  
dc.rights
info:eu-repo/semantics/openAccess  
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/  
dc.subject
Cyclopterid  
dc.subject
Aphlebia  
dc.subject
Stipule  
dc.subject
Organography  
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Taxonomy  
dc.subject
Palaoecology  
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Seed Ferns  
dc.subject.classification
Oceanografía, Hidrología, Recursos Hídricos  
dc.subject.classification
Ciencias de la Tierra y relacionadas con el Medio Ambiente  
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS  
dc.title
Modified basal elements in Dicroidium fronds (Corystospermales)  
dc.type
info:eu-repo/semantics/article  
dc.type
info:ar-repo/semantics/artículo  
dc.type
info:eu-repo/semantics/publishedVersion  
dc.date.updated
2017-09-07T16:51:24Z  
dc.journal.volume
170  
dc.journal.pagination
15-26  
dc.journal.pais
Países Bajos  
dc.journal.ciudad
Ámsterdam  
dc.description.fil
Fil: Bomfleur, Benjamin. University of Kansas; Estados Unidos  
dc.description.fil
Fil: Escapa, Ignacio Hernán. Museo Paleontológico Egidio Feruglio; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina  
dc.description.fil
Fil: Taylor, Edith L.. University of Kansas; Estados Unidos  
dc.description.fil
Fil: Taylor, Thomas N.. University of Kansas; Estados Unidos  
dc.journal.title
Review of Palaeobotany and Palynology  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S003466671100176X  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/j.revpalbo.2011.10.012