CERDA Ignacio Alejandro
New materials of lithostrotian titanosaurs (Dinosauria: Sauropoda) from the Late Cretaceous of central Patagonia
LUCIO IBIRICU; GABRIEL CASAL; RUBÉN MARTÍNEZ; MARCELO LUNA; EZEQUIEL GONZÁLEZ SVOBODA; IGNACIO A. CERDA
CRETACEOUS RESEARCH (PRINT)
ACADEMIC PRESS LTD-ELSEVIER SCIENCE LTD
Lugar: Amsterdam; Año: 2017
Continental Cretaceous deposits exposed in central Patagonia, Argentina, preserve a rich and important record of titanosaurian evolution that spans the entire Upper Cretaceous. Recently, a new lithostragraphic unit, the Lago Colhue Huapi Formation (Coniacian e Maastrichtian), was located in the Golfo SanJorge Basin. Here, we describe new titanosaurian sauropod material from that formation (UNPSJB-Pv 1051). The material consists of a partially articulated left hind limb and disarticulated but associated skeletal elements. They are confidently referred to Titanosauria, and within that clade, to Lithostrotia,probably occupying a derived position. We interpret the bone concentration as an assemblage of hydraulic origin deposited in a fluvial channel. This new material begins the incipient fossil record of the Lago Colhue Huapi Formation, thereby also increasing the titanosaurian diversity of the latest Cretaceous.Additionally, the new titanosaurian enhances evidence in support of strong faunal similarities among the Allen and Marilia formations, chronological equivalents in the Cretaceous of South America. Furthermore, the Lago Colhue Huapi specimen adds to the Late Cretaceous record of Titanosauria and augmentsour knowledge of central Patagonian terrestrial vertebrate assemblages during this interval.