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
Shaojin Hu (1993) assigned specimen KMV 8701 to "Dilophosaurus sinensis". In 2013, a study by Currie et al., confirmed that "D. sinensis" was the same animal as "Sinosaurus triassicus" On the other hand, Wang "et al." (2017) stated that it needs to be further investigated whether "D. sinensis" is indeed a junior synonym of "S. triassicus", and noted that the two species are different at least in the anatomy of the premaxilla. The authors tentatively assigned "D. sinensis" to the genus "Sinosaurus", but retained it as a species distinct from "Sinosaurus triassicus". Specimen KMV 8701 consists of a skull (measuring 525 mm), and is nearly complete. The specimen KMV 8701 is about long, meaning "Sinosaurus" was about that length. KMV 8701 has been assigned now to "Sinosaurus", but the specimen still lacks sufficient description and preparation. In 2012, a new specimen of "Sinosaurus" was described, and was found to represent a new species.