![]() ![]() In 2019, its maximum adult size was estimated up to 11.7 m (38 ft) in length and 3.9 t (4.3 short tons) in body mass. The authors also wrote that the holotype specimen was already comparable in size to Saurophaganax and Acrocanthosaurus despite the visible neurocentral sutures showing absence of ossification, suggesting a skeletally immature individual. Zanno and Mackovicky (2013), using a femur circumference regression, estimated its mass at roughly 4 metric tons (4.4 short tons). Siats represents one of the largest known theropods from North America. It was collected between 20 from the Mussentuchit Member of the Cedar Mountain Formation, in Emery County of Utah, dating to the early Cenomanian stage of the Late Cretaceous, approximately 94.5 million years ago. The bones were first seen protruding out of a hillside, prompting the excavation. FMNH PR 2716 was discovered by Lindsay Zanno, as a part of a 2008 expedition of the Field Museum led by Peter Makovicky. FMNH PR 2716 consists of five dorsal and eight caudal vertebrae, a chevron, partial right ilium, ischium and fibula, a partial left tibia, and several right and left pedal phalanges. Siats is known from the holotype FMNH PR 2716, a partial postcranial skeleton housed at the Field Museum of Natural History, Chicago. The specific name meekerorum honors the late geologist John Caldwell Meeker who bequeathed a fund for the support of paleontological research, his widow Withrow Meeker and their daughter Lis Meeker, one of the volunteers in the research project. ![]() ![]() The generic name is derived from the name of Siats, a man-eating monster in the Ute mythology. Makovicky in 2013 and the type species is Siats meekerorum. Siats was first described in 2012 and named by Lindsay E. ![]()
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