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.
Goronyosaurus
"Goronyosaurus" is a smaller mosasaur, with a body length reconstructed as by Soliar (1988). Previously the body had been estimated at , although Soliar identified that this length was based on a false head: body ratio. This ratio is 9.1:100 is drastically different from the ratio in tylosaurines, where the head is 13.8% the length of the body.