saurischian

All previous feathered theropods belong to the saurischian order, whereas the new fossil belongs to the ornithischian.

Although rare exceptions are found in parts of this arrangement (e.g., in the squid and the crab, and the larger saurischian dinosaurs with a "second brain" at the base of the tail), these exceptions act to fulfill the same fundamental plan.

47 Which creatures could be either ornithischian or saurischian?

Because the various groups had such dissimilar anatomies, early dinosaur investigators presumed that the bird-hipped ornithischians had evolved from a different stock of reptiles than had the sauropods and theropods, which together form a group called saurischian dinosaurs, characterized by their lizard-like pelvises.

(1992): A re-evaluation of the taxonomy of Newark Supergroup saurischian dinosaur tracks, using extensive statistical data from a recently exposed tracksite near Culpeper, Virginia.

(2002): Tails of saurischian dinosaurs in the Early Jurassic of the Newark Supergroup (eastern North America).