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 .
Sinosaurus
"Dilophosaurus sinensis" was shown to be a junior synonym of "Sinosaurus" in 2003. It is possibly closer to the Antarctic theropod "Cryolophosaurus", based on the fact that the anterior end of the jugal does not participate in the internal antorbital fenestra and that the maxillary tooth row is completely in front of the eye socket. "D. sinensis" was exhibited in 1998 at Dinofest in Philadelphia. Although the skull of "D. sinensis" sports large nasolacrimal crests superficially like those reconstructed in "D. wetherilli", features elsewhere in the skeleton suggest it is closer to tetanuran theropods. Rauhut (2003) regarded "D. sinensis" as a basal tetanuran most closely related to "Sinosaurus" and "Cryolophosaurus". Lamanna "et al." (1998b) examined the material ascribed to "D. sinensis" and found it to be synonymous with "Sinosaurus triassicus". This cladistic finding was confirmed in 2003 by Dong.