aberrant group of saurischians in a position subject to change among sauropodomorphs and theropods. Dong also agreed with these similarities and placed the genus within the Segnosauridae in 1992. Nevertheless, the description of Alxasaurus in 1993 proved that the long-aberrant segnosaurs were tetanuran theropod dinosaurs and Segnosauridae was a junior synonym of the older name Therizinosauridae. Segnosauria also became synonymous with Therizinosauria. In 1997, with the description and naming of "N". bohlini, Dong and You placed the therizinosaurids Nanshiungosaurus and the former into a separate Nanshiungosauridae. They did not provide authentic traits or bases behind this new grouping. In 2010, Zanno performed one of the most complete analyses of the Therizinosauria at that point and noted that these two species do not pertain to the same genus and therefore the use of the Nanshiungosauridae was invalid and represents a synonym of Therizinosauridae. Nanshiungosaurus features multiple therizinosaurid traits such as an ophisthopubic pelvis, elongated iliac blade and an expanded obturator process. In her phylogenetic analysis, Zanno recovered this taxon as a derived therizinosaurid closer to Nothronychus and Segnosaurus. The therizinosaurid placement of Nanshiungosaurus has been widely followed and corroborated by most cladistic analyses. The extensive phylogenetic analysis conducted by Hartman and colleagues in 2019 based on Zanno's 2010 analysis, recovers Nanshiungosaurus in a more derived position than Neimongosaurus or Therizinosaurus. Below are the obtained results: Paleoecology Nanshiungosaurus was one of the last therizinosaurs to exist. The fossil remains were unearthed from the Nanxiong Formation, which has been dated to the latest Maastrichtian stage about 66.7 ± 0.3 million years ago. This formation is mainly composed by purplish mudstones and siltstones, and was deposited in a floodplain environment, under a relatively warm, humid subtropical climate. Oviraptorid eggs are particularly common on the formation with at least five well-preserved egg clutches. Moreover, a fossilized female oviraptorid with two eggs is known from the formation. The tracks of ornithopod dinosaurs are locally abundant at the Nanxiong region. The therizinosaurid Nanshiungosaurus was a bulky high-browser in its ecosystem, and shared its habitat with multiple oviraptorosaur species such as Banji, Ganzhousaurus, Corythoraptor, Nankangia, Huanansaurus or Shixinggia. However, it is possible that some of these oviraptorosaurs did not actually live together given the poor stratigraphic analysis of the formation. Additional dinosaurs are represented by the fast-running, long-snouted tyrannosaurid Qianzhousaurus, the sauropod Gannansaurus, and the very sparse remains of hadrosaurid dinosaurs such as Microhadrosaurus (now a nomen dubium).