First rebbachisaurid sauropod dinosaur from Asia

Area of Science:

• Paleontology
• Vertebrate Paleontology
• Dinosauria

Background:

• The Bissekty Formation in Uzbekistan has yielded diverse dinosaur fossils.
• Sauropods are a key component of Cretaceous ecosystems, but Asian rebbachisaurid records are scarce.

Purpose of the Study:

• To describe a new sauropod taxon from the Upper Cretaceous Bissekty Formation.
• To determine the phylogenetic placement and biogeographic significance of this new dinosaur.

Main Methods:

• Morphological analysis of an isolated anterior caudal vertebra (USNM 538127).
• Phylogenetic analysis to establish evolutionary relationships within Diplodocoidea.
• Comparative anatomy with known rebbachisaurid taxa.

Main Results:

• Dzharatitanis kingi gen. et sp. nov. is described, representing the first rebbachisaurid dinosaur from Asia.
• Phylogenetic analysis places Dzharatitanis within the diplodocoid clade Rebbachisauridae, one of the youngest known rebbachisaurids.
• The vertebra exhibits unique characteristics, including 'wing-like' transverse processes and a pneumatized neural spine with a transversely expanded apex.

Conclusions:

• Dzharatitanis kingi expands the known geographic distribution of rebbachisaurids to Asia.
• Its occurrence suggests potential European origins, linking Asian and European dinosaur faunas.
• This discovery highlights the Bissekty Formation as a significant site for understanding dinosaur evolution and paleobiogeography.