Sinosauropteryx
"Sinosauropteryx" was a small bipedal theropod, noted for its short arms, large first finger (thumbs), and long tail. The taxon includes some of the smallest known adult non-avian theropod specimens, with the holotype specimen measuring only in length, including the tail. However, this individual was relatively young. The longest known specimen reaches up to in length, with an estimated weight of .
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.