Sinosauropteryx
Three specimens have been assigned to "Sinosauropteryx prima": the holotype GMV 2123 (and its counter slab [opposite face], NIGP 127586), NIGP 127587, and D 2141. Another specimen, IVPP V14202, was assigned to the genus but not to the only species by Zhang and colleagues. The assignment of an additional larger specimen to "S. prima", GMV 2124, was later found to be in error. All of the fossils were found in the Jianshangou or Dawangzhangzi Beds of the Yixian Formation in the Beipiao and Lingyuan regions of Liaoning, China. These fossil beds have been dated to 124.6–122 million years ago, during the early Aptian stage of the Early Cretaceous.
Dilophosauridae
While dilophosaurids flourished during the Early Jurassic, they were mostly extinct by the end of the Early Jurassic period (201.3-174.1 Ma). Dilophosaurid fossils have been found on two continents: "Dilophosaurus wetherilli" was discovered in North America and "Dracovenator regenti" was discovered in South Africa. The taxa previously considered Dilophosaurids, "Sinosaurus" and "Cryolophosaurus", have been found in China (Dong 2003; Xing et al. 2013a, 2014) and Antarctica, respectively.