Aoniraptor Explained

Aoniraptor is a genus of possibly megaraptoran or bahariasaurid theropod dinosaur from the Late Cretaceous of Argentina (Huincul Formation).

Discovery and naming

The holotype, MPCA-Pv 804/1 to 804/25, which consists of the last sacral vertebra, six proximal caudal vertebrae, four mid-caudal vertebrae, and five haemal arches, was recovered by Matias Motta from the Violante Farm, part of the Huincul Formation. It was discovered in 2010, but only formally described in 2016.[1]

Aoniraptor comes from the Tehuelche language word "Aoni", which means south, and the Latin word "raptor", meaning thief. The specific name, libertatem, comes from the Latin word for freedom, as it was discovered on the bicentennial of Argentina's independence from Spain in 1810.[1]

Description

Aoniraptor grew up to 6m (20feet) long.

Aoniraptor has been considered as synonymous with the theropod Gualicho, described from the same formation, due to the similarities of their caudal vertebrae.[2] [3] If found to be true, the name Gualicho would have precedent. Aranciaga Rolando et al. in 2020 performed a comparative analysis between Aoniraptor and Gualicho, and found many differences between the two.[4]

Classification

The majority of studies recover Aoniraptor as a megaraptoran.[5] However, Cau (2024) recovered Aoniraptor as a bahariasaurid, along with Bahariasaurus, Deltadromeus, and Gualicho, with this clade as the sister taxon to Elaphrosaurus.[6]

See also

Notes and References

  1. Motta . Matías J. . Aranciaga Rolando . Alexis M. . Rozadilla . Sebastián . Agnolín . Federico E. . Chimento . Nicolás R. . Egli . Federico Brissón . Novas . Fernando E. . June 2016 . New theropod fauna from the Upper Cretaceous (Huincul Formation) of northwestern Patagonia, Argentina . New Mexico Museum of Natural History and Science Bulletin . 71 . 231–253 . ResearchGate.
  2. Web site: Mortimer. Mickey. Is Gualicho Aoniraptor?. The Theropod Database Blog. July 14, 2016. 2016-07-13.
  3. Web site: Cau. Andrea. Nuovi resti di Aoniraptor? Ehm... Benvenuto Gualicho!. Theropoda. July 14, 2016.
  4. Rolando. Mauro Aranciaga. Marsà. Jordi Garcia. Novas. Fernando. 2020. Histology and pneumaticity of Aoniraptor libertatem' (Dinosauria, Theropoda), an enigmatic mid-sized megaraptoran from Patagonia. Journal of Anatomy. en. 237. 4. 741–756. 10.1111/joa.13225. 1469-7580. 7495275. 32470191.
  5. Rolando . Alexis M. A. . Motta . Matias J. . Agnolín . Federico L. . Manabe . Makoto . Tsuihiji . Takanobu . Novas . Fernando E. . April 26, 2022 . A large Megaraptoridae (Theropoda: Coelurosauria) from Upper Cretaceous (Maastrichtian) of Patagonia, Argentina . Scientific Reports . 12 . 1 . Article number 6318 . 10.1038/s41598-022-09272-z . 35474310 . 9042913 . free. 2022NatSR..12.6318A .
  6. Cau . Andrea . 2024 . A Unified Framework for Predatory Dinosaur Macroevolution . Bollettino della Società Paleontologica Italiana . 63 . 1 . 1–19 . 10.4435/BSPI.2024.08 . 0375-7633.

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