Xixiaichthys

{{Short description|Extinct genus of bony fish}}

{{Speciesbox

| fossil_range = Early Cretaceous, {{fossilrange|Barremian|Aptian}}

| genus = Xixiaichthys

| parent_authority = Zhang, 2004

| species = tongxiensis

| authority = Zhang, 2004

}}

Xixiaichthys is an extinct genus of osteoglossiform fish that lived in China during the Early Cretaceous and was found in the Madongshan Formation and also the Xinminbao Group. The type species is Xixiaichthys tongxiensis and is based on the holotype (specimen V 13114.1), a complete skeleton,Zhang, J. (2004). New Fossil Osteoglossomorph from Ningxia, China. Journal of Vertebrate Paleontology 24(3):515-524 and several other specimens of varying completeness.

Kim et al. (2022) compared a fish centrum found with the holotype of the theropod dinosaur Raptorex kriegsteini with Harenaichthys lui and Xixiaichthys tongxinensis, and interpreted their findings as supporting the conclusion that the holotype of R. kriegsteini comes from the Nemegt Formation.{{cite journal|last1=Kim|first1=S.-H.|last2=Lee|first2=Y.-N.|last3=Park|first3=J.-Y.|last4=Lee|first4=S.|last5=Winkler|first5=D. A.|last6=Jacobs|first6=L. L.|last7=Barsbold|first7=R.|date=2022|title=A new species of Osteoglossomorpha (Actinopterygii: Teleostei) from the Upper Cretaceous Nemegt Formation of Mongolia: Paleobiological and paleobiogeographic implications|journal=Cretaceous Research|volume=135|page=105214 |doi=10.1016/j.cretres.2022.105214|s2cid=247637952 }} They also tentatively assigned the centrum to their new genus Harenaichthys.