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dc.contributor.author
Wilf, Peter
dc.contributor.author
Stevenson, Dennis Wm.
dc.contributor.author
Cúneo, Néstor Rubén
dc.date.available
2018-07-25T19:43:25Z
dc.date.issued
2016-09
dc.identifier.citation
Wilf, Peter; Stevenson, Dennis Wm.; Cúneo, Néstor Rubén; The last patagonian cycad, austrozamia stockeyi gen. et sp. nov., early eocene of laguna del hunco, Chubut, Argentina; National Research Council Canada-NRC Research Press; Botany; 94; 9; 9-2016; 817-829
dc.identifier.issn
1916-2790
dc.identifier.uri
http://hdl.handle.net/11336/53134
dc.description.abstract
The cycads pose classic problems in evolutionary biogeography, owing to their far-flung extant distributions and the sparse fossil records of living genera. A noteworthy example is Tribe Encephalarteae of Family Zamiaceae, today consisting of Encephalartos (Africa) and the Australian genera Lepidozamia and Macrozamia. Numerous petrified trunks of Encephalarteae described from the Cretaceous of Patagonia, Antarctica, and India indicate far larger past distributions across Gondwana and subsequent extinctions. The only fossils close to the current range are Paleogene leaf fragments from Australia assigned to Lepidozamia and Macrozamia. Here, we report a large frond piece and several isolated leaflets of a compressed cycad, along with an associated spiny petiole, from the late-Gondwanan, 52.2 Ma Laguna del Hunco flora of Patagonia, Argentina. Austrozamia stockeyi gen. et sp. nov., has the novel combination of an Encephalartos-type leaf and Lepidozamia-type cuticle. The Australian Lepidozamia fossils, widely used for molecular clock calibrations, could also represent an extinct genus. Austrozamia stockeyi demonstrates survival of the Encephalarteae in Patagonia and presumably across Gondwana until its terminal phase, adding a striking new component to the growing list of South American plant extinctions associated with Antarctic separation and related climate changes.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
National Research Council Canada-NRC Research Press
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Cycads
dc.subject
Encephalartos
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Eocene
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Lepidozamia
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Patagonia
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Zamiaceae
dc.subject.classification
Meteorología y Ciencias Atmosféricas
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Ciencias de la Tierra y relacionadas con el Medio Ambiente
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CIENCIAS NATURALES Y EXACTAS
dc.title
The last patagonian cycad, austrozamia stockeyi gen. et sp. nov., early eocene of laguna del hunco, Chubut, Argentina
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2018-07-25T13:52:33Z
dc.journal.volume
94
dc.journal.number
9
dc.journal.pagination
817-829
dc.journal.pais
Canadá
dc.journal.ciudad
Otawa
dc.description.fil
Fil: Wilf, Peter. State University of Pennsylvania; Estados Unidos
dc.description.fil
Fil: Stevenson, Dennis Wm.. New York Botanical Garden; Estados Unidos
dc.description.fil
Fil: Cúneo, Néstor Rubén. Museo Paleontológico Egidio Feruglio; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
dc.journal.title
Botany
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1139/cjb-2016-0038
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://www.nrcresearchpress.com/doi/10.1139/cjb-2016-0038#.W1jNINVKiUk
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