Sinosauropteryx
"Sinosauropteryx" was a small theropod with an unusually long tail and short arms. The longest known specimen reaches up to in length, with an estimated weight of It was a close relative of the similar but older genus "Compsognathus", both genera belonging to the family Compsognathidae. Only one species of "Sinosauropteryx" has been named: "S. prima", meaning "first" in reference to its status as the first feathered non-avialian dinosaur species discovered. Three specimens have been described. The third specimen previously assigned to this genus represents either a second, as-yet unnamed species or a distinct, related genus.
Austroraptor
Considered large for a dromaeosaur, "Austroraptor cabazai" measured about in length from head to tail. In 2010, Gregory S. Paul estimated its length at 6 metres, its weight at 661.387 pounds or 300 kilograms. It is the largest dromaeosaur to be discovered in the Southern Hemisphere. The type specimen, labeled MML-195, consisted of a fragmentary skeleton including parts of the dinosaur's skull, the lower jaws, a few neck and torso vertebrae, some ribs, a humerus, and assorted bones from both legs. However little of the entire skeleton was found, what bones were available for analysis expressed some distinct characteristics that differentiate "Austroraptor" from other dromaeosaurs. "A. cabazai"'s 80 centimeter-long skull was low and elongated, much more so than that of other dromaeosaurs. Several of its skull bones bore some resemblance to that of the smaller troodontid deinonychosaurs. The front limbs of this taxon were short for a dromaeosaur, with its humerus less than half the length of its femur. Among the Dromaeodauridae, only this genus, "Tianyuraptor", "Zhenyuanlong" and "Mahakala" have similarly reduced forelimbs. The relative length of its arms has caused "Austroraptor" to be compared to another, more famous short-armed dinosaur, "Tyrannosaurus".