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.
&quot;Sinopliosaurus&quot; fusuiensis
In 1975, five fossil teeth were described by Chinese palaeontologists Hou Lian-Hai, Yeh Hsiang-K'uei, and Zhao Xi-Jin. The specimens were collected from the Xinlong Formation of the Guangxi Province in southern China, and assigned by Hou and colleagues to a new species of "Sinopliosaurus", a pliosauroid known only from limb elements found in the Early Jurassic. A 2008 paper by Eric Buffetaut and colleagues referred the four of the original specimens (one was not found in the museum collection) to a new species of spinosaurid dinosaur. Other spinosaurid teeth from indeterminate forms have been reported from the formation, but remain undescribed.