Xianshanosaurus

Xianshanosaurus; Temporal range: Early Cretaceous, Aptian–Albian PreꞒ Ꞓ O S D C P T J K Pg N
	Reconstructed skeleton
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Clade:	Dinosauria
Clade:	Saurischia
Suborder:	†Sauropodomorpha
Clade:	†Sauropoda
Clade:	†Eusauropoda
Clade:	†Neosauropoda
Clade:	†Macronaria
Clade:	†Somphospondyli
Clade:	†Titanosauria
Genus:	†Xianshanosaurus; Lü et al., 2009
Type species
	Xianshanosaurus shijiagouensis; Lü et al., 2009

Xianshanosaurus (meaning "Xianshan lizard") is a genus of titanosaur sauropod dinosaur from the Early Cretaceous (Aptian-Albian) of the Ruyang Basin in Henan Province, China. It was described in 2009 by a team of Chinese paleontologists. The type species is X. shijiagouensis.[1]

Classification

Mathew Wedel and Mike Taylor, made a cladistic analysis of the pneumaticity of caudal vertebrae. The analysis found that Xianshanosaurus was a basal titanosaurian, with Malawisaurus and Trigonosaurus as its sister taxa. The cladogram found is shown below:[2]

Macronaria

Camarasaurus

Giraffatitan

	Cedarosaurus

	Venenosaurus

Malawisaurus

Trigonosaurus

Xianshanosaurus

	Gondwanatitan

	Aeolosaurus

	Alamosaurus

	Opisthocoelicaudia

Neuquensaurus

	Rocasaurus

	Saltasaurus

Habitat

Xianshanosaurus shared its habitat with Ruyangosaurus, "Huanghetitan" ruyangensis, Yunmenglong, Luoyanggia, and Zhongyuansaurus. The Haoling Formation was initially thought to be Cenomanian in age, but is now considered Aptian-Albian.[3]

References

Lü, J.; Xu, L.; Jiang, X.; Jia, S.; Li, M.; Yuan, C.; Zhang, X.; Ji, Q. (2009). "A preliminary report on the new dinosaurian fauna from the Cretaceous of the Ruyang Basin, Henan Province of central China". Journal of the Paleontological Society of Korea. 25: 43–56.
Wedel, M. J.; Taylor, M. P. (2013). "Caudal Pneumaticity and Pneumatic Hiatuses in the Sauropod Dinosaurs Giraffatitan and Apatosaurus". PLoS ONE. 8 (10): e78213. doi:10.1371/journal.pone.0078213. PMC 3812994. PMID 24205162.
Xu, L., Pan, Z.C., Wang, Z.H., Zhang, X.L., Jia, S.H., Lü, J.C., Jiang, B.L., 2012. Discovery and significance of the Cretaceous system in Ruyang Basin, Henan Province. Geological Review 58, 601-613.

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[1] Lü, J.; Xu, L.; Jiang, X.; Jia, S.; Li, M.; Yuan, C.; Zhang, X.; Ji, Q. (2009). "A preliminary report on the new dinosaurian fauna from the Cretaceous of the Ruyang Basin, Henan Province of central China". Journal of the Paleontological Society of Korea. 25: 43–56.

[wedel2013-2] Wedel, M. J.; Taylor, M. P. (2013). "Caudal Pneumaticity and Pneumatic Hiatuses in the Sauropod Dinosaurs Giraffatitan and Apatosaurus". PLoS ONE. 8 (10): e78213. doi:10.1371/journal.pone.0078213. PMC 3812994. PMID 24205162.

[3] Xu, L., Pan, Z.C., Wang, Z.H., Zhang, X.L., Jia, S.H., Lü, J.C., Jiang, B.L., 2012. Discovery and significance of the Cretaceous system in Ruyang Basin, Henan Province. Geological Review 58, 601-613.