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.
Metriacanthosauridae
Metriacanthosauridae fossils have only been found in modern Europe and Asia, parts of the prehistoric landmass Laurasia. From those found in Asia, most are from China, with a few discoveries in Thailand and other Asian countries. The group is thought to have originated in Asia and spread westward to Europe. "Yangchuanosaurus" has only been found in Yangchuan, Sichuan, China. "Metriacanthosaurus" has been found in Northern Europe. Similar to "Yangchuanosaurus", "Sinraptor" has been found in Sichuan, but also in Xinjiang. In 2008, Xu and Clarke described a large tooth found in the Junggard Basin in Xinjian, China, belonging to a large sinraptorid. "Siamotyrannus" has been found exclusively in Thailand. "Shidaisaurus" has been found in Yunnan,China.