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dc.contributor.author
Escapa, Ignacio Hernan  
dc.contributor.author
Cuneo, Nestor Ruben  
dc.contributor.author
Rothwell, Gar  
dc.contributor.author
Stockey, Ruth  
dc.date.available
2015-07-31T17:20:05Z  
dc.date.issued
2013-07  
dc.identifier.citation
Escapa, Ignacio Hernan; Cuneo, Nestor Ruben; Rothwell, Gar; Stockey, Ruth; Pararaucaria delfueyoi sp. nov. from the late jurassic canadon calcareo formation, chubut, Argentina: Insights into the evolution of the cheirolepidiaceae; University of Chicago Press; International Journal of Plant Sciences; 174; 3; 7-2013; 458-470  
dc.identifier.issn
1058-5893  
dc.identifier.uri
http://hdl.handle.net/11336/1531  
dc.description.abstract
The discovery of 16 cylindrical conifer seed cones at the Estancia Vilan locality in the Late Jurassic Canadon Calcreo Formation of Chubut Province, Patagonia, Argentina, provides anatomically preserved specimens, allowing for the description of a second species of Pararaucaria (Cheirolepidiaceae). The new species, Pararaucaria delfueyoi, is similar in general features to the type species, Pararaucaria patagonica, but has a specifically diagnostic combination of characters that include cone size, seed number, features of histology, and seed size. Specimens are cylindrical with a narrow axis that bears helically arranged bract/scale complexes. The bract and scale diverge from the axis at ;90° and separate from each other almost immediately. The ovuliferous scale extends toward the margin of the cone and then arches over to enclose two inverted nonwinged seeds within a pocket of tissue. Although the specimens are abraded such that the distal regions of the ovuliferous scales are not preserved, this combination of morphological and histological characters allows for the assignment of P. delfueyoi to the Cheirolepidiaceae with confidence. The co-occurrence of this cone with an undescribed species of Araucaria extends the geographic and stratigraphic ranges of this association, which previously has been known only from the Middle Jurassic of Santa Cruz Province of Patagonia. This extends the knowledge of anatomical variation among seed cones of Cheirolepidiaceae and improves our understanding of homology relationships for conifer seed cone structures.  
dc.format
application/pdf  
dc.language.iso
eng  
dc.publisher
University of Chicago Press  
dc.rights
info:eu-repo/semantics/openAccess  
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/  
dc.subject
CHEIROLEPIDIACEAE  
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CONIFERS  
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JURASSIC  
dc.subject
PARARAUCARIA  
dc.subject
PATAGONIA  
dc.subject.classification
Paleontología  
dc.subject.classification
Ciencias de la Tierra y relacionadas con el Medio Ambiente  
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CIENCIAS NATURALES Y EXACTAS  
dc.title
Pararaucaria delfueyoi sp. nov. from the late jurassic canadon calcareo formation, chubut, Argentina: Insights into the evolution of the cheirolepidiaceae  
dc.type
info:eu-repo/semantics/article  
dc.type
info:ar-repo/semantics/artículo  
dc.type
info:eu-repo/semantics/publishedVersion  
dc.date.updated
2016-03-30 10:35:44.97925-03  
dc.journal.volume
174  
dc.journal.number
3  
dc.journal.pagination
458-470  
dc.journal.pais
Estados Unidos  
dc.journal.ciudad
Chicago  
dc.description.fil
Fil: Escapa, Ignacio Hernan. Museo Paleontologico Egidio Feruglio; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina  
dc.description.fil
Fil: Cuneo, Nestor Ruben. Museo Paleontologico Egidio Feruglio; Argentina  
dc.description.fil
Fil: Rothwell, Gar. Ohio State University; Estados Unidos de América;  
dc.description.fil
Fil: Stockey, Ruth. State University of Oregon; Estados Unidos de América;  
dc.journal.title
International Journal of Plant Sciences  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1086/668612