Primeiro registro de osteodermo de crocodiliformes da Formação Marília (grupo bauru, cretáceo superior) do município de Quirinópolis, estado de Goiás

Abstract

The Mesoeucrocodylia from the Late Cretaceous of South America were one of the maincomponents of the tetrapod faunas found in rocks of the Bauru Group in the states of Goiás,Minas Gerais and São Paulo. The presence of osteoderms has been reported in articulatedspecies or found isolated in the geological record. In the present work, the first osteoderm ofMesoeucrocodylia from the Campanian-Maastrichtian of the Marília Formation (Bauru Group) ofthe state of Goiás is described. Paleo-UFG-114 has a quadrilateral shape, has a rough externaltexture with radially oriented corrosion, an internal facet with the presence of intersectinggrooves, foramina in the internal and external region and the presence of a poorly developedkeel. These features differentiate them from the osteoderms of titanosaur dinosaurs found inthe rocks of this geological unit. The presence of Paleo-UFG-114 in the state of Goiás reaffirmsthat mesoeucrocodylians were important components of the reptile fauna, and also contributesto increasing knowledge about the group's geographic distribution in this little-explored region.