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Agathis trees of Patagonia's Cretaceous-Paleogene death landscapes and their evolutionary significance.
Escapa, Ignacio H; Iglesias, Ari; Wilf, Peter; Catalano, Santiago A; Caraballo-Ortiz, Marcos A; Rubén Cúneo, N.
Afiliación
  • Escapa IH; Museo Paleontológico Egidio Feruglio-Consejo Nacional de Investigaciones Científicas y Técnicas, Avenida Fontana 140, Trelew, 9100, Chubut, Argentina.
  • Iglesias A; División Paleontología, Universidad Nacional del Comahue, Instituto de Investigaciones en Biodiversidad y Ambiente - Consejo Nacional de Investigaciones Científicas y Técnicas, San Carlos de Bariloche, 8400, Río Negro, Argentina.
  • Wilf P; Department of Geosciences, Pennsylvania State University, University Park, PA, 16802, USA.
  • Catalano SA; Unidad Ejecutora Lillo (FML-CONICET), Calle Miguel Lillo 205, San Miguel de Tucumán, Tucumán, Argentina.
  • Caraballo-Ortiz MA; Facultad de Ciencias Naturales e Instituto Miguel Lillo, Universidad Nacional de Tucumán, Consejo Nacional de Investigaciones Científicas y Técnicas.
  • Rubén Cúneo N; Department of Biology, Pennsylvania State University, University Park, PA, 16802, USA.
Am J Bot ; 105(8): 1345-1368, 2018 08.
Article en En | MEDLINE | ID: mdl-30074620
PREMISE OF THE STUDY: The fossil record of Agathis historically has been restricted to Australasia. Recently described fossils from the Eocene of Patagonian Argentina showed a broader distribution than found previously, which is reinforced here with a new early Paleocene Agathis species from Patagonia. No previous phylogenetic analyses have included fossil Agathis species. METHODS: We describe macrofossils from Patagonia of Agathis vegetative and reproductive organs from the early Danian, as well as leaves with Agathis affinities from the latest Maastrichtian. A total evidence phylogenetic analysis is performed, including the new Danian species together with other fossil species having agathioid affinities. KEY RESULTS: Early Danian Agathis immortalis sp. nov. is the oldest definite occurrence of Agathis and one of the most complete Agathis species in the fossil record. Leafy twigs, leaves, pollen cones, pollen, ovuliferous complexes, and seeds show features that are extremely similar to the living genus. Dilwynites pollen grains, associated today with both Wollemia and Agathis and known since the Turonian, were found in situ within the pollen cones. CONCLUSIONS: Agathis was present in Patagonia ca. 2 million years after the K-Pg boundary, and the putative latest Cretaceous fossils suggest that the genus survived the K-Pg extinction. Agathis immortalis sp nov. is recovered in a stem position for the genus, while A. zamunerae (Eocene, Patagonia) is recovered as part of the crown. A Mesozoic divergence for the Araucariaceae crown group, previously challenged by molecular divergence estimates, is supported by the combined phylogenetic analyses including the fossil taxa.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Evolución Biológica / Tracheophyta / Fósiles País/Región como asunto: America do sul / Argentina Idioma: En Revista: Am J Bot Año: 2018 Tipo del documento: Article País de afiliación: Argentina Pais de publicación: Estados Unidos
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Evolución Biológica / Tracheophyta / Fósiles País/Región como asunto: America do sul / Argentina Idioma: En Revista: Am J Bot Año: 2018 Tipo del documento: Article País de afiliación: Argentina Pais de publicación: Estados Unidos