Saurischia

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Saurischia

an order of dinosaurs lacking a post-pelvic bone and having a normal PELVIC GIRDLE, unlike Ornithischia. The group includes the large four-footed dinosaurs such as Diplodocus.
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All previous feathered theropods belong to the saurischian order, whereas the new fossil belongs to the ornithischian.
The find "pulls the origin of feathers down into the Triassic, when the saurischian and ornithischian lineages of dinosaurs split", said Philip Currie at the University of Alberta in Canada.
The two researchers showed that some saurischians and ornithischians had remarkably similar joints, indicating that the earliest members of these two lineages had sprung from one line of animals that bore features common to both groups.