Artículo

Hermsen, E.J.; Gandolfo, M.A.; Del Carmen Zamaloa, M. "The fossil record of Eucalyptus in Patagonia" (2012) American Journal of Botany. 99(8):1356-1374
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Abstract:

Premise of the study: Herein, we name, describe, and illustrate new macrofossil material representing Eucalyptus (Myrtaceae: Myrtoideae, Eucalypteae) from the diverse early Eocene Laguna del Hunco (LH) fl ora of Chubut Province, Patagonia, Argentina. We explore the signifi cance of these fossils in light of understanding the fossil record of eucalypts and the biogeography of the Eucalypteae. Methods: Fossils representing vegetative and reproductive organs were collected from multiple LH localities over several field seasons. These specimens were prepared, photographed, and compared to extant Eucalyptus. Additional historical collections of Patagonian fossil Eucalyptus were also examined. Key results: Vegetative and reproductive organs representing five different Eucalyptus taxa were identifi ed in the LH paleoflora. One new taxon each representing leaves, flower buds, and infructescences with co-occurring, isolated capsules are described and named as new Eucalyptus species. Additionally, two flower types cf. Eucalyptus, represented by one specimen each, are illustrated and briefl y described. The fossil species have unique characteristics that independently suggest each belongs within the Eucalypteae. The reproductive material is most similar morphologically to extant Eucalyptus, although it also shares many similarities to the closely related genus Corymbia. Conclusions: The LH fossil Eucalyptus material is among the few eucalypt macrofossils that have recently been named and described and are the oldest macrofossils that can presently be definitively ascribed to the Eucalypteae. They also represent the only credible description of Eucalyptus fossils occurring outside of Australasia and suggest a once broader geographic distribution for this group. © 2012 Botanical Society of America.

Registro:

Documento: Artículo
Título:The fossil record of Eucalyptus in Patagonia
Autor:Hermsen, E.J.; Gandolfo, M.A.; Del Carmen Zamaloa, M.
Filiación:L. H. Bailey Hortorium, Department of Plant Biology, Cornell University, 412 Mann Library Building, Ithaca, NY 14853, United States
Departamento de Ecología, Genética y Evolución, Universidad de Buenos Aires, Capital Federal, Buenos Aires, Argentina
Palabras clave:Argentina; Eocene; Eucalypteae; Eucalyptus; Fossil; Laguna del Hunco; Patagonia; Taxonomy; biogeography; coexistence; Eocene; evergreen tree; fossil record; geographical distribution; morphology; paleoecology; photography; taxonomy; Argentina; article; classification; Eucalyptus; flower; fossil; geography; histology; phylogeny; plant leaf; Argentina; Eucalyptus; Flowers; Fossils; Geography; Phylogeny; Plant Leaves; Australasia; Patagonia
Año:2012
Volumen:99
Número:8
Página de inicio:1356
Página de fin:1374
DOI: http://dx.doi.org/10.3732/ajb.1200025
Título revista:American Journal of Botany
Título revista abreviado:Am. J. Bot.
ISSN:00029122
CODEN:AJBOA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00029122_v99_n8_p1356_Hermsen

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Citas:

---------- APA ----------
Hermsen, E.J., Gandolfo, M.A. & Del Carmen Zamaloa, M. (2012) . The fossil record of Eucalyptus in Patagonia. American Journal of Botany, 99(8), 1356-1374.
http://dx.doi.org/10.3732/ajb.1200025
---------- CHICAGO ----------
Hermsen, E.J., Gandolfo, M.A., Del Carmen Zamaloa, M. "The fossil record of Eucalyptus in Patagonia" . American Journal of Botany 99, no. 8 (2012) : 1356-1374.
http://dx.doi.org/10.3732/ajb.1200025
---------- MLA ----------
Hermsen, E.J., Gandolfo, M.A., Del Carmen Zamaloa, M. "The fossil record of Eucalyptus in Patagonia" . American Journal of Botany, vol. 99, no. 8, 2012, pp. 1356-1374.
http://dx.doi.org/10.3732/ajb.1200025
---------- VANCOUVER ----------
Hermsen, E.J., Gandolfo, M.A., Del Carmen Zamaloa, M. The fossil record of Eucalyptus in Patagonia. Am. J. Bot. 2012;99(8):1356-1374.
http://dx.doi.org/10.3732/ajb.1200025