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Artículo

Araucaria lefipanensis (Araucariaceae), a new species with dimorphic leaves from the Late Cretaceous of Patagonia, Argentina

Andruchow Colombo, AnaIcon ; Escapa, Ignacio HernánIcon ; Cúneo, Néstor RubénIcon ; Gandolfo, Maria Alejandra
Fecha de publicación: 06/2018
Editorial: Botanical Society of America
Revista: American Journal of Botany
ISSN: 0002-9122
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Paleontología

Resumen

Premise of the Study: We describe a new araucarian species, Araucaria lefipanensis, from the Late Cretaceous flora of the Lefipán Formation, in Patagonia (Argentina) based on reproductive and vegetative remains, with a combination of characters that suggest mosaic evolution in the Araucaria lineage. Methods: The studied fossils were found at the Cañadón del Loro locality. Specimens were separated into two leaf morphotypes, and their morphological differences were tested with MANOVA. Key Results: The new species Araucaria lefipanensis is erected based on the association of dimorphic leaves with cuticle remains and isolated cone scale complexes. The reproductive morphology is characteristic of the extant section Eutacta, whereas the vegetative organs resemble those of the sections Intermedia, Bunya, and Araucaria (the broad-leaved clade). Conclusions: The leaf dimorphism of A. lefipanensis is similar to that of extant A. bidwillii, where dimorphism is considered to be related to seasonal growth. The leaf dimorphism in A. lefipanensis is consistent with the paleoclimatic and paleoenvironmental reconstructions previously suggested for the Lefipán Formation, which is thought to have been a seasonal subtropical forest. The new species shows evidence of mosaic evolution, with cone scale complexes morphologically similar to section Eutacta and leaves similar to the sections of the broad-leaved clade, constituting a possible transitional form between these two well-defined lineages. More complete plant concepts, especially those including both reproductive and vegetative remains are necessary to understand the evolution of ancient plant lineages. This work contributes to this aim by documenting a new species that may add to the understanding of the early evolution of the sections of Araucaria.
Palabras clave: ARAUCARIA , ARAUCARIACEAE , ARGENTINA , CAÑADÓN DEL LORO , CRETACEOUS , LEAF DIMORPHISM , LEFIPÁN FORMATION , MAASTRICHTIAN , MOSAIC EVOLUTION , PATAGONIA
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/117605
URL: http://doi.wiley.com/10.1002/ajb2.1113
DOI: http://dx.doi.org/10.1002/ajb2.1113
Colecciones
Articulos(SEDE CENTRAL)
Articulos de SEDE CENTRAL
Citación
Andruchow Colombo, Ana; Escapa, Ignacio Hernán; Cúneo, Néstor Rubén; Gandolfo, Maria Alejandra; Araucaria lefipanensis (Araucariaceae), a new species with dimorphic leaves from the Late Cretaceous of Patagonia, Argentina; Botanical Society of America; American Journal of Botany; 105; 6; 6-2018; 1067-1087
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