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 .
Scymnosaurus
"Scymnosaurs" are estimated to have been approximately the size of the modern day hyena, and possess teeth suggesting that they were carnivorous. S. Ferox was initially described as the second largest Therocephalian to "Titanosaurus", until the discovery of "S." "Major", which is likely the largest Therocephalian.