Bizarre tail weaponry in a transitional ankylosaur from subantarctic Chile.

  title={Bizarre tail weaponry in a transitional ankylosaur from subantarctic Chile.},
  author={Sergio Soto-Acu{\~n}a and Alexander O. Vargas and Jonatan Kaluza and Marcelo A Leppe and Jo{\~a}o F. Botelho and Jos{\'e} Palma-Liberona and Carolina Simon-Gutstein and Roy A. Fern{\'a}ndez and H{\'e}ctor Ortiz and Ver{\'o}nica Milla and B{\'a}rbara Aravena and Leslie Manr{\'i}quez and Jhonatan Alarc{\'o}n-Mu{\~n}oz and Juan Pino and Cristine Trevisan and H{\'e}ctor Mansilla and Luis Felipe Hinojosa and Vicente Mu{\~n}oz-Walther and David Rubilar-Rogers},
Armoured dinosaurs are well known for their evolution of specialized tail weapons-paired tail spikes in stegosaurs and heavy tail clubs in advanced ankylosaurs1. Armoured dinosaurs from southern Gondwana are rare and enigmatic, but probably include the earliest branches of Ankylosauria2-4. 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… 

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