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.
Rinconsaurus
Like all sauropods, "Rinconsaurus" was a large long-necked quadrupedal animal, with a long, whip-like tail and four pillar-like legs. "Rinconsaurus" was an unusually slender sauropod. Although fossil discoveries are incomplete, and no complete necks or heads have been found, fully grown "Rinconsaurus" are estimated to have been 11 meters (36 ft) long and approximately 2.5 meters (8 ft) high at the shoulder. Though only a portion of one skull has been recovered, "Rinconsaurus" may have had a long, narrow skull, based on fossil evidence of the skulls of related titanosaurs.