Abstract
Liaoningotitan sinensis It is one of the three species of sauropods found in the biota Jehol. Liaoningotitan sinensis It is from the Yixian formation of the lower Cretaceous in Liaoning, China. The discovery of Liaoningotitan sinensis It was an important advance to investigate the diversity of giant herbivorous animals in the biota Jehol. However, research and analysis of Liaoningotitan sinensis They are not complete yet. This study presents an exhaustive investigation and analysis of Liaoningotitan sinensis Holotype First, the skull, vertebrae, pelvic girdle and appendular elements of Liaoningotitan sinensis The holotype was carefully reexamined, which led to the discovery of the mosaic evolution that occurs in the skull and the identification of a new autapomorphy of humerus of Liaoningotitan sinensis: The point of junction of the Coracobrachial muscle on the anterior surface of the proximal end of the humerus is flat. Second, the characteristics of the Liaoningotitan sinensis Holotype and other well -preserved sauropod dinosaurs were used to rebuild the skull of Liaoningotitan sinensis. Next, Euhelopus Zdanskyi was used to rebuild the body type of Liaoningotitan sinensis holotype, the result indicating that Liaoningotitan sinensis It was approximately 10 m long. Finally, TNT software was used to analyze the phylogenetic position of Liaoningotitan sinensiswith the result indicating that Liaoningotitan Sinensis It can be classified in the euhelopodidae.
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Skull of Liaoningotitan sinensis Holotype PMOL-AD00112. Preserved elements of Liaoningotitan sinensis Holotype PMOL-AD00112. Edited from Euhelopus zdanskyi, A complete titanosauriform dinosaur preserved. Painted by Gallipus (a net assistant identification https://www.deviantart.com/yty2000) Scale bar: 1 m. |
Conclusion:
He Liaoningotitan sinensis Holotype is a partial skeleton of the Yixian formation of the lower Cretaceous, a formation famous by Jehol Biota. Shows some characteristics that suggest Liaoningotitan sinensis It is a valid species that can be distinguished from other titanosauriform dinosaurs. This analysis classifies Liaoningotitan sinensis In Euhelopodidae, indicating that the members of the Euhelopodidae family inhabited this biota, which increases the known diversity of sauropod dinosaurs in the biota Jehol. Research on the skull of Liaoningotitan sinensis The holotype indicated that mosaic evolution is present in the LiaoningotitanAnd it is in the Titanosauriform transition phase of early divergence to Titanosauriforiforms of late divergence. The reconstruction of the body type of Liaoningotitanwhich refers Euhelopus zdanskyishows that the Liaoningotitan sinensis The holotype has more than 10 m long. Therefore, it is a medium -sized sauropod dinosaur. However, the non -merged sacral vertebrae indicated that the holotype is an immature specimen. In the end, we conclude the type of skull of titanosauriforms. We obtained four types, indicating that the evolution of the titanosauriformes can be more complex than we consider in the past.
#Paleontology #Liaoningtotitan #Sinensis #Zhou
