Quilmesaurus

Quilmesaurus is a genus of theropod dinosaur from the Patagonian Upper Cretaceous (Campanian stage), a time when South American theropod assemblages were dominated by abelisaurids and carcharodontosaurs. However, the morphology of Quilmesaurus suggests it may have been a tetanuran. Though only portions of the right leg have been recovered, this animal is estimated to have measured 5–6 meters (16–20 feet) in length. The holotype (MPCA-PV-100; Museo Provincial Carlos Ameghino) consists of the distal half of the right femur and a complete right tibia collected from the Allen Formation (Campanian-Maastrichtian), Malarge Group, Neuquén Basin, at Salitral Ojo de Aqua, 40 kilometers south of Roca City, Río Negro Province, northern Argentina. The specimen came from the fluvial sandstones at the bottom of the Allen Formation and was collected in the late 1980s by a field crew from the Universidad Nacional Tucumán.