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Artículo

The appendicular skeleton of Rinconsaurus caudamirus (Sauropoda: Titanosauria) from the Upper Cretaceous of Patagonia, Argentina

Pérez Moreno, AgustínIcon ; Otero, AlejandroIcon ; Carballido, José LuisIcon ; Salgado, LeonardoIcon ; Calvo, Jorge Orlando
Fecha de publicación: 10/2022
Editorial: Academic Press Ltd - Elsevier Science Ltd
Revista: Cretaceous Research
ISSN: 0195-6671
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Paleontología

Resumen

Rinconsaurus caudamirus, from the Bajo de la Carpa Formation (Santonian), Río Negro, Argentina, is represented by several axial and appendicular elements from, at least, four specimens. The axial skeleton of this taxon was described in detail in a recent contribution, pending a complete analysis and description of its appendicular skeleton. This contribution focuses on the description of the appendicular skeleton of Rinconsaurus and its phylogenetic relationships, considering the new information provided here. Rinconsaurus clearly differs from other titanosaurs for the presence of several autapomorphic characters and for a unique association of characters, some of which are also present in lognkosaurians, aeolosaurines and saltasaurines titanosaurs, and by having a scapula with a scapular blade angled 65° with respect to the coracoid articulation, similar to that of Bellusaurus, Dreadnoughtus and Muyelensaurus. Equations for estimating body mass in sauropods based on long bone circumference suggest a body mass of at least 3–5 tonnes for the largest individuals of Rinconsaurus, being lighter than saltasaurines, but heavier than aeolosaurines. Rinconsaurus was incorporated into an expanded version of a phylogenetic data matrix along with several contemporary South American titanosaurs. The resulting data matrix comprises 102 taxa scored for 431 characters, and our phylogenetic analysis retrieves Rinconsaurus as a member of the clade Rinconsauria. For its part, the clade Rinconsauria, in which Aeolosaurini is nested, is recovered within a diverse Lognkosauria. When the resulting trees are time calibrated and taking into account the position of Ninjatitan within Rinconsauria, there results that the possible origin of the clades Lognkosauria and Rinconsauria (among other titanosaur clades) could have occurred towards the beginning of the Early Cretaceous.
Palabras clave: APPENDICULAR SKELETON , PATAGONIA , PHYLOGENY , RINCONSAURUS , TITANOSAURIA , UPPER CRETACEOUS
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info:eu-repo/semantics/restrictedAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Atribución-NoComercial-SinDerivadas 2.5 Argentina (CC BY-NC-ND 2.5 AR)
Identificadores
URI: http://hdl.handle.net/11336/202296
DOI: http://dx.doi.org/10.1016/j.cretres.2022.105389
URL: https://www.sciencedirect.com/science/article/pii/S0195667122002531
Colecciones
Articulos(CCT - LA PLATA)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - LA PLATA
Articulos(IIPG)
Articulos de INSTITUTO DE INVESTIGACION EN PALEOBIOLOGIA Y GEOLOGIA
Citación
Pérez Moreno, Agustín; Otero, Alejandro; Carballido, José Luis; Salgado, Leonardo; Calvo, Jorge Orlando; The appendicular skeleton of Rinconsaurus caudamirus (Sauropoda: Titanosauria) from the Upper Cretaceous of Patagonia, Argentina; Academic Press Ltd - Elsevier Science Ltd; Cretaceous Research; 142; 105389; 10-2022; 1-32
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