Department of Theriology, Zoological Institute, Russian Academy of Sciences, St. Petersburg, Russia.
Department of Paleobiology, National Museum of Natural History, Smithsonian Institution, Washington, D.C., United States of America.
PLoS One. 2021 Feb 24;16(2):e0246620. doi: 10.1371/journal.pone.0246620. eCollection 2021.
Dzharatitanis kingi gen. et sp. nov. is based on an isolated anterior caudal vertebra (USNM 538127) from the Upper Cretaceous (Turonian) Bissekty Formation at Dzharakuduk, Uzbekistan. Phylogenetic analysis places the new taxon within the diplodocoid clade Rebbachisauridae. This is the first rebbachisaurid reported from Asia and one of the youngest rebbachisaurids in the known fossil record. The caudal is characterized by a slightly opisthocoelous centrum, 'wing-like' transverse processes with large but shallow PRCDF and POCDF, and the absence of a hyposphenal ridge and of TPRL and TPOL. The neural spine has high SPRL, SPDL, SPOL, and POSL and is pneumatized. The apex of neural spine is transversely expanded and bears triangular lateral processes. The new taxon shares with Demandasaurus and the Wessex rebbachisaurid a high SPDL on the lateral side of the neural spine, separated from SPRL and SPOL. This possibly suggests derivation of Dzharatitanis from European rebbachisaurids. This is the second sauropod group identified in the assemblage of non-avian dinosaurs from the Bissekty Formation, in addition to a previously identified indeterminate titanosaurian.
Dzharatitanis kingi gen. et sp. nov. 基于一个孤立的前尾椎（USNM 538127），来自乌兹别克斯坦 Dzharakuduk 的上白垩统（Turonian）Bissekty 组。系统发育分析将新分类群置于 diplodocoid 分支 Rebbachisauridae 内。这是亚洲报道的第一个 Rebbachisaurid，也是已知化石记录中最年轻的 Rebbachisaurid 之一。尾部特征为略微后凸的中心，“翼状”的横向过程，具有较大但浅的 PRCDF 和 POCDF，并且没有下棘突脊和 TPRL 和 TPOL。神经棘具有较高的 SPRL、SPDL、SPOL 和 POSL，并且充气。神经棘的尖端横向扩展，并带有三角形的侧突。新分类群与 Demandasaurus 和 Wessex Rebbachisaurid 共享神经棘侧面的高 SPDL，与 SPRL 和 SPOL 分离。这可能表明 Dzharatitanis 源自欧洲 Rebbachisaurid。这是在 Bissekty 组的非鸟类恐龙组合中鉴定出的第二个蜥脚类恐龙群，除了先前鉴定的不确定的泰坦巨龙类。
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