Ornithischia is a clade of dinosaurs that, from its origins, would diversify into many later forms, such as ankylosaurs, stegosaurs, hadrosaurs, ceratopsians, and pachycephalosaurs. While the ...

The fossil, dating back approximately 193 million years to the Early Jurassic period, could represent the oldest known representative of the Ornithischia group in the region. Led by Xi Yao from ...