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.
Yingshanosaurus
"Yingshanosaurus" had a pair of about eighty centimetres long wing-like spines on its shoulders, similar in shape and relative size to those of "Gigantspinosaurus". The shoulder spine has a large flat trapezoidal base; after a sudden kink, a more narrow straight shaft, flat but with a protruding ridge on the outer side, projects to behind from the lower base edge. The bony plates on its back were rather small and relatively low, triangular or fin-shaped. The largest plates, about fifteen centimetres high and with a base length of twenty centimetres, are similar in profile to those of "Hesperosaurus", though of a more reduced relative size. They were not "splates", i.e. featuring a thickened middle section, but almost uniformly flat, with a rough and veined surface.