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dc.contributor.author
Carrizo, Martin Alejandro
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dc.contributor.author
Lafuente Diaz, Maiten Amalia
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dc.contributor.author
del Fueyo, Georgina Marisa
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dc.contributor.author
Guignard, Gaëtan
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dc.date.available
2021-01-27T22:05:33Z
dc.date.issued
2019-10
dc.identifier.citation
Carrizo, Martin Alejandro; Lafuente Diaz, Maiten Amalia; del Fueyo, Georgina Marisa; Guignard, Gaëtan; Cuticle ultrastructure in Brachyphyllum garciarum sp. nov (Lower Cretaceous, Argentina) reveals its araucarian affinity; Elsevier Science; Review of Palaeobotany and Palynology; 269; 10-2019; 104-128
dc.identifier.issn
0034-6667
dc.identifier.uri
http://hdl.handle.net/11336/123952
dc.description.abstract
A detailed and extensive study of a new species, Brachyphyllum garciarum sp. nov., was carried out through the analysis of the gross morphology and the cuticle fine details, structure and ultrastructure characters of its leaves using light microscope and scanning and transmission electron microscope. The fossils consist of compressions of incomplete twigs with well-preserved cuticle, collected from pelitic levels of the Springhill Formation (lower Hauterivian/lower Barremian) at the Río Correntoso locality in the Santa Cruz province, Argentina. The twigs have adpressed scale-like leaves spirally disposed. Leaves have a rhomboidal to pyramidal shape, a width and length always in a 1:1 ratio, margin entire and apex mostly rounded. Leaves are amphistomatic with stomatal apparatuses occurring in groups of narrow-wedge shape along the leaf axis. Stomatal apparatuses are close to each other with subsidiary cells in contact; the guard cells are sunken, with marked polar extensions and thickened mouth. Remnants of hypodermis cells are present in both foliar epidermis. Ultrastructurally, four types of cuticles were observed and evaluated statistically in detail: the ordinary epidermal cell upper and lower cuticles and the subsidiary cell cuticle are compounded of A2 granular layer and a spongy B1 layer somewhat mixed with cell wall remnants, while the guard cell cuticle presents only a spongy B1 layer. An Energy Dispersive Spectroscopy study was also made revealing the presence of 10 characteristic ratios with taxonomic importance, at least at the species level: N/Na, S/Cl, S/Na, Cl/K, K/Na as the most important; followed by N/Ca, S/K, Cl/Ca, Cl/Na; and S/Ca being the least reliable. The combination of morphological and cuticle ultrastructure features of Brachyphyllum garciarum sp. nov. are unique and clearly different from other contemporary species of the genus from Western Gondwana. Moreover, the ultrastructure of the foliar cuticle suggests a highly probable affinity with the Araucariaceae Family, more precisely with the genus Araucaria. Of the four recognized sections among the living species of Araucaria, the leaf morphology of B. garciarum sp. nov. is mostly similar with some species of the Eutacta section.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Elsevier Science
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dc.rights
info:eu-repo/semantics/restrictedAccess
dc.rights
Atribución-NoComercial-CompartirIgual 2.5 Argentina (CC BY-NC-SA 2.5 AR)
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
BRACHYPHYLLUM
dc.subject
FOLIAR CUTICLE
dc.subject
LOWER CRETACEOUS
dc.subject
PATAGONIA
dc.subject
TAXONOMY
dc.subject
ULTRASTRUCTURE
dc.subject.classification
Paleontología
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dc.subject.classification
Ciencias de la Tierra y relacionadas con el Medio Ambiente
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
Cuticle ultrastructure in Brachyphyllum garciarum sp. nov (Lower Cretaceous, Argentina) reveals its araucarian affinity
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2020-11-26T17:50:38Z
dc.journal.volume
269
dc.journal.pagination
104-128
dc.journal.pais
Países Bajos
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dc.journal.ciudad
Amsterdam
dc.description.fil
Fil: Carrizo, Martin Alejandro. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentina
dc.description.fil
Fil: Lafuente Diaz, Maiten Amalia. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentina
dc.description.fil
Fil: del Fueyo, Georgina Marisa. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentina
dc.description.fil
Fil: Guignard, Gaëtan. Université Claude Bernard Lyon 1; Francia. Centre National de la Recherche Scientifique; Francia
dc.journal.title
Review of Palaeobotany and Palynology
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/abs/pii/S0034666719300570
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/https://doi.org/10.1016/j.revpalbo.2019.06.014
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