90-million-year-old Alnashetri skeleton reveals early alvarezsaur evolution in Patagonia
A nearly complete 90-million-year-old skeleton of Alnashetri cerropoliciensis was discovered in northern Patagonia at the La Buitrera fossil site in 2014 and described in 2026. The fossil belongs to a member of the alvarezsaurs, a group of theropod dinosaurs known for their tiny teeth and almost comically reduced forelimbs. For years, researchers struggled to understand … Read more