Theropod dinosaurs form a group within the order of saurischian dinosaurs. (sciencedaily.com)
The new lagerpetid (Ixalerpeton) and saurischian dinosaur (Buriolestes) were unearthed from the ~ 230 - million - year - old Carnian Santa Maria Formation — one of the oldest known rock units including dinosaur fossils anywhere in the world. (sciencedaily.com)
Theropods have traditionally been classed as saurischians. (sciencemag.org)