Monday, March 6, 2023

[Paleontology • 2023] Chucarosaurus diripienda • A New Giant Titanosaur (Sauropoda: Titanosauria: Colossosauria) from the Upper Cretaceous of Northwestern Patagonia, Argentina

Chucarosaurus diripienda 
 Agnolin, Gonzalez Riga, Aranciaga Rolando, Rozadilla, Motta, Chimento & Novas, 2023

Chucarosaurus diripienda gen. et sp. nov. is a new and large titanosaurian sauropod from the Neuquén Basin, Rio Negro Province, Patagonia. The specimen was discovered in the Upper Cretaceous strata of the Huincul Formation (middle Cenomanian–lower Turonian). It includes appendicular and relatively slender elements, with a femoral total length of about 1.9 m long. This taxon shows a unique combination of characters indicating that appendicular bones such as the femur, ischium and tibia, show a remarkable morphological variety, greater than previously described, and are morphologically informative as source of phylogenetic data. A cladistic phylogenetic analysis placed Chucarosaurus well nested within the Colossosauria clade.

 Keywords: Chucarosaurus, Sauropods, Colossosauria, Neuquén Basin, Cenomanian–Turonian, Patagonia, Argentina

Dinosauria Owen 1842
Saurischia Seeley 1887
Sauropoda Marsh, 1878

Titanosauria Bonaparte and Coria, 1993
Colossosauria Gonzalez Riga, Lamanna, Otero, Ortiz David, Kellner, and Ibiricu, 2019 

Chucarosaurus diripienda gen. et sp. nov. 

 Etymology. Chucaro, from the native language Quechua, also used for the gauchos (people who live in the countryside of Argentina), Mapundungum, meaning hard and indomitable animalsaurus, from the Latin, reptile; diripienda, from the Latin, meaning scrambled.

Federico L. Agnolin, Bernardo J. Gonzalez Riga, Alexis M. Aranciaga Rolando, Sebastián Rozadilla, Matías J. Motta, Nicolás R. Chimento and Fernando E. Novas. 2023. A New Giant Titanosaur (Dinosauria, Sauropoda) from the Upper Cretaceous of Northwestern Patagonia, Argentina. Cretaceous Research. 146, 105487. DOI: 10.1016/j.cretres.2023.105487