Bizarre tail weaponry in a transitional ankylosaur from subantarctic Chile
Author
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Soto Acuña, Sergio Gonzalo
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Vargas Milne, Alexander Omar
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Kaluza, Jonatan
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Leppe, Marcelo A.
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Botelho, Joao Francisco
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Palma Liberona, José Antonio
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Gutstein, Carolina
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Fernández, Roy
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Ortiz, Héctor
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Milla, Verónica
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Aravena, Bárbara
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Manríquez, Leslie
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Alarcón Muñoz, Jhonatan
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Pino, Juan Pablo
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Trevisan, Cristine
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Mansilla, Héctor
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Hinojosa Opazo, Luis Felipe Camilo
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Muñoz Walther, Vicente
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Rubilar Rogers, David Eliseo
Admission date
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2022-05-03T17:00:45Z
Available date
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2022-05-03T17:00:45Z
Publication date
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2021
Cita de ítem
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Nature Volume 600 Issue 7888 Page 259-+ Dec 9 2021
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Identifier
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10.1038/s41586-021-04147-1
Identifier
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https://repositorio.uchile.cl/handle/2250/185243
Abstract
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Armoured dinosaurs are well known for their evolution of specialized tail weapons-paired tail spikes in stegosaurs and heavy tail clubs in advanced ankylosaurs(1). Armoured dinosaurs from southern Gondwana are rare and enigmatic, but probably include the earliest branches of Ankylosauria(2-4). Here we describe a mostly complete, semi-articulated skeleton of a small (approximately 2 m) armoured dinosaur from the late Cretaceous period of Magallanes in southernmost Chile, a region that is biogeographically related to West Antarctica(5). Stegouros elengassen gen. et sp. nov. evolved a large tail weapon unlike any dinosaur: a flat, frond-like structure formed by seven pairs of laterally projecting osteoderms encasing the distal half ofthe tail. Stegouros shows ankylosaurian cranial characters, but a largely ancestral postcranial skeleton, with some stegosaur-like characters. Phylogenetic analyses placed Stegouros in Ankylosauria; specifically, it is related to Kunbarrasaurus from Australia(6) and Antarctopelta from Antarctica(7), forming a Glade of Gondwanan ankylosaurs that split earliest from all other ankylosaurs. The large osteoderms and specialized tail vertebrae in Antarctopelta suggest that it had a tail weapon similar to Stegouros. We propose a new clade, the Parankylosauria, to include the first ancestor of Stegouros-but not Ankylosaurus-and all descendants ofthat ancestor.
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Patrocinador
dc.description.sponsorship
Agencia Nacional de Investigacion y Desarrollo ANID (National Agency for Research and Development) of the Chilean Ministry of Science, Technology, Knowledge and Innovation through grant PIA Anillo ACT172099
Comision Nacional de Investigacion Cientifica y Tecnologica (CONICYT)
CONICYT FONDECYT 1190891
1151389
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Lenguage
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en
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Publisher
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Nature Research
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Type of license
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Attribution-NonCommercial-NoDerivs 3.0 United States