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dc.contributor.author
Escapa, Ignacio Hernán  
dc.contributor.author
Rothwell, Gar  
dc.contributor.author
Stockey, Ruth  
dc.contributor.author
Cúneo, Néstor Rubén  
dc.date.available
2023-04-20T14:01:09Z  
dc.date.issued
2012-06  
dc.identifier.citation
Escapa, Ignacio Hernán; Rothwell, Gar; Stockey, Ruth; Cúneo, Néstor Rubén; Seed cone anatomy of cheirolepidiaceae (coniferales): Reinterpreting pararaucaria patagonica wieland; Botanical Society of America; American Journal of Botany; 99; 6; 6-2012; 1058-1068  
dc.identifier.issn
0002-9122  
dc.identifier.uri
http://hdl.handle.net/11336/194744  
dc.description.abstract
• Premise of the study: Seed cone morphology and anatomy reflect some of the most important changes in the phylogeny and evolutionary biology of conifers. Reexamination of the enigmatic Jurassic seed cone Pararaucaria patagonica reveals previously unknown systematically informative characters that demonstrate affinities with the Cheirolepidiaceae. This paper documents, for the first time, internal anatomy for seed cones of this important extinct Mesozoic conifer family, which may represent the ghost lineage leading to modern Pinaceae. • Methods: Morphology and anatomy of cones from the Jurassic La Matilde Formation in Patagonia are described from a combination of polished wafers and thin section preparations. New photographic techniques are employed to reveal histological details of thin sections in which organic cell wall remains are not preserved. Specific terminology for conifer seed cones is proposed to help clarify hypotheses of homology for the various structures of the cones. • Key results: Specimens are demonstrated to have trilobed ovuliferous scale tips along with a seed enclosing pocket of ovuliferous scale tissue. Originally thought to represent a seed wing in P. patagonica, this pocket-forming tissue is comparable to the flap of tissue covering seeds of compressed cheirolepidiaceous cones and is probably the most diagnostic character for seed cones of the family. • Conclusions: Pararaucaria patagonica is assigned to Cheirolepidiaceae, documenting anatomical features for seed cones of the family and providing evidence for the antiquity of pinoid conifers leading to the origin of Pinaceae. A list of key morphological and anatomical characters for seed cones of Cheirolepidiaceae is developed to facilitate assignment of a much broader range of fossil remains to the family. This confirms the presence of Cheirolepidiaceae in the Jurassic of the Southern Hemisphere, which was previously suspected from palynological records.  
dc.format
application/pdf  
dc.language.iso
eng  
dc.publisher
Botanical Society of America  
dc.rights
info:eu-repo/semantics/openAccess  
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/  
dc.subject
CHEIROLEPIDIACEAE  
dc.subject
CONIFERS  
dc.subject
JURASSIC  
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PARARAUCARIA  
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PATAGONIA  
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SEED CONES  
dc.subject.classification
Paleontología  
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Ciencias de la Tierra y relacionadas con el Medio Ambiente  
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CIENCIAS NATURALES Y EXACTAS  
dc.title
Seed cone anatomy of cheirolepidiaceae (coniferales): Reinterpreting pararaucaria patagonica wieland  
dc.type
info:eu-repo/semantics/article  
dc.type
info:ar-repo/semantics/artículo  
dc.type
info:eu-repo/semantics/publishedVersion  
dc.date.updated
2023-04-19T17:25:48Z  
dc.journal.volume
99  
dc.journal.number
6  
dc.journal.pagination
1058-1068  
dc.journal.pais
Estados Unidos  
dc.journal.ciudad
St. Louis  
dc.description.fil
Fil: Escapa, Ignacio Hernán. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Museo Paleontológico Egidio Feruglio; Argentina. University of Alberta; Canadá  
dc.description.fil
Fil: Rothwell, Gar. State University of Oregon; Estados Unidos. Ohio University; Estados Unidos  
dc.description.fil
Fil: Stockey, Ruth. State University of Oregon; Estados Unidos  
dc.description.fil
Fil: Cúneo, Néstor Rubén. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Museo Paleontológico Egidio Feruglio; Argentina  
dc.journal.title
American Journal of Botany  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://bsapubs.onlinelibrary.wiley.com/doi/10.3732/ajb.1100544  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.3732/ajb.1100544