アルゼンチンで新種の恐竜を発見…前脚のない最強ハンターの一種か
アルゼンチンで発見された新種の恐竜に似た種とされるアベリサウルス類カルノタウルス・サストレイの想像図。 Fred Wierum/Wikimedia Commons/CC ...
掲載された
この新種の恐竜に関する論文が、2022年2月10日付けで｢Journal of Vertebrate Palaeontology｣に <anchor>掲載された</anchor>。それによると、6600万年前の小惑星衝突で恐竜が絶滅する直前の白亜紀後期、アルゼンチン北西部は独特な生物の生息域だった可能性があるという。
First definitive abelisaurid theropod from the Late Cretaceous of Northwestern Argentina: Journal of Vertebrate Paleontology: Vol 41, No 4
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ARTICLES

# First definitive abelisaurid theropod from the Late Cretaceous of Northwestern Argentina

Federico L. Agnolín 1 CONICET-Laboratorio de Anatomía Comparada y Evolución de los Vertebrados, Museo Argentino de Ciencias Naturales “Bernardino Rivadavia”, Av. Ángel Gallardo 470, C1405DJR Buenos Aires, Argentina;2 Fundación de Historia Natural “Félix de Azara”, Universidad Maimónides, Hidalgo 775, 1405 Buenos Aires, ArgentinaCorrespondencefedeagnolin@yahoo.com.ar

Article: e2002348
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Received 14 Jun 2021, Accepted 13 Oct 2021, Published online: 10 Feb 2022

/doi/full/10.1080/02724634.2021.2002348?needAccess=true

## ABSTRACT

The fossil record of abelisaurid theropods in South America is mostly limited to Brazil and Argentina. In Argentina, abelisaurids are generally known from Patagonia, where their record is relatively abundant and includes well-known and complete specimens. However, for North-western Argentina, abelisaurids are represented by incomplete and isolated bones and teeth that remain largely unpublished. The aim of this contribution is to report a nearly complete abelisaurid braincase from the Late Cretaceous Los Blanquitos Formation (Campanian), Amblayo Valley, Salta province, Argentina. The specimen shows plesiomorphic features for abelisaurids, including a thin skull roof, absence of skull projections like horns or bulges, and low and narrow parietal eminence that lie at the same level as the sagittal crest. Furthermore, the specimen possesses some autapomorphies that support its status as a new taxon and its small size allows it to be assigned as one of the smallest abelisaurids recorded up to date. The finding of this specimen constitutes the first unequivocal occurrence of an abelisaurid in Northwestern Argentina and brings new evidence concerning the geographic distribution of the clade during Late Cretaceous times in South America.

### ACKNOWLEDGMENTS

Special thanks to I. Poyo, to the personnel of the TCba Salguero Diagnostic Center (Buenos Aires, Argentina), and to the Jaime Roca Foundation for lending us the necessary equipment and providing us with scanned images. This work was partially funded by PICT 2013-220 (to AS), PICT 2018-0717 (to APC) Leverhulme Grant RPG-2014/364 to A.G. and T.J.D.H, European Research Council grant STG-2014-637171 to AG, and Royal Society International Exchange Grant IEC\R2\170120 to AS and AG. Thanks to the reviewers R. Delcourt and J. I. Canale and the Editor A. Balanoff for their comments that greatly improved the quality of the manuscript. Special thanks to J. Ochoa who skillfully made the shaded illustrations of the skull of Guemesia. His art greatly improved the quality of our work. We thank the Editor A. Balanoff for her help during the processing of the MS.

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