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.
Scymnosaurus
"Scymnosaurs" are estimated to have been approximately the size of the modern day hyena, and possess teeth suggesting that they were carnivorous. S. Ferox was initially described as the second largest Therocephalian to "Titanosaurus", until the discovery of "S." "Major", which is likely the largest Therocephalian.