The fossil record of Eucalyptus in Patagonia

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...

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Publicado:	2012
Materias:	Argentina Eocene Eucalypteae Eucalyptus Fossil Laguna del Hunco Patagonia Taxonomy biogeography coexistence evergreen tree fossil record geographical distribution morphology paleoecology photography taxonomy article classification flower fossil geography histology phylogeny plant leaf Flowers Fossils Geography Phylogeny Plant Leaves Australasia
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00029122_v99_n8_p1356_Hermsen http://hdl.handle.net/20.500.12110/paper_00029122_v99_n8_p1356_Hermsen
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_00029122_v99_n8_p1356_Hermsen
record_format	dspace
spelling	paper:paper_00029122_v99_n8_p1356_Hermsen2023-06-08T14:23:05Z The fossil record of Eucalyptus in Patagonia 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 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. 2012 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00029122_v99_n8_p1356_Hermsen http://hdl.handle.net/20.500.12110/paper_00029122_v99_n8_p1356_Hermsen
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	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
spellingShingle	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 The fossil record of Eucalyptus in Patagonia
topic_facet	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
description	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.
title	The fossil record of Eucalyptus in Patagonia
title_short	The fossil record of Eucalyptus in Patagonia
title_full	The fossil record of Eucalyptus in Patagonia
title_fullStr	The fossil record of Eucalyptus in Patagonia
title_full_unstemmed	The fossil record of Eucalyptus in Patagonia
title_sort	fossil record of eucalyptus in patagonia
publishDate	2012
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00029122_v99_n8_p1356_Hermsen http://hdl.handle.net/20.500.12110/paper_00029122_v99_n8_p1356_Hermsen
_version_	1768544664971902976

The fossil record of Eucalyptus in Patagonia

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