Leshansaurus

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Leshansaurus
Temporal range: Late Jurassic, 161.2–155.7 Ma
Leshansaurus reconstructed skull.png
Skull reconstruction showing known material (white and light grey)
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauria
Order: Saurischia
Suborder: Theropoda
Family: Megalosauridae
Subfamily: Afrovenatorinae
Genus: Leshansaurus
Li et al., 2009
Species
  • Leshansaurus qianweiensis Li et al., 2009 (type)

Leshansaurus is a genus of theropod dinosaur from the Late Jurassic Shaximiao Formation of what is now China. It was described in 2009 by a team of Chinese paleontologists. The type species is Leshansaurus qianweiensis. Fossils of Leshansaurus were discovered in strata from the Shangshaximiao Formation, a formation rich in dinosaur fossils. Li et al. referred this taxon to Sinraptoridae – a group of carnosaurian theropods,[1] but it may it belong to Megalosauridae instead.[2]

Discovery and naming[edit]

Size of Leshansaurus qianweiensis

The holotype (QW 200701) was found in 2007. It is a fairly complete skeleton consisting of a partial skull and lower jaws, seven cervical vertebrae, twelve dorsal vertebrae, five sacral vertebrae, two caudal vertebrae, and much of the hind limbs and hands. A second specimen (QW 200702), an isolated femur from a juvenile, has been designated as the paratype.

Leshansaurus qianweiensis was named and described in 2009 by Li Fei, Peng Guangzhao, Ye Yong, Jiang Shan, and Huang Daxi. The generic name refers to Leshan, a nearby city in Sichuan, China, and the specific epithet refers to Qianwei, the county in which the fossils were found.

Description[edit]

Leshansaurus was a medium-sized theropod that would have had a length of six to seven meters, and a hip height of about one and a half meters.

Leshansaurus has an elongated skull that is broader towards the front. The femur has a length of 62 centimeters, and the tibia has a length of 52 centimeters. Its autapomorphies (unique characteristics) are the possession of a sharp central ridge on the supraoccipital (the bone above the occipital), elongated frontal bones that are 2.86 times as long as they are wide, slender basipterygoid projections on the basisphenoid, a bone of the lower braincase, an atlas intercentrum that is horseshoe-shaped in cross-section, slender diapophyses, thin spines of the dorsal vertebrae and sacral vertebrae, the possession of a clear keel at the bottom of the sacral vertebrae, and an ilium with on the inner side a distinct ridge along the edge of the hip joint.

Phylogeny[edit]

The describers placed Leshansaurus in the Sinraptoridae, but they did not carry out a cladistic analysis. An analysis by Matthew Carrano in 2012 found it to be a member of the megalosaurid Afrovenatorinae, as sister species of Piveteausaurus, a taxon known only from a braincase nearly identical to that of Leshansaurus. The phylogenetic position of Leshansaurus according to Carrano e.a. (2012) is shown by this cladogram:[3]

Megalosauroidea

Piatnitzkysauridae Piatnitzkysaurus floresi by Paleocolour.jpg

Megalosauria

Streptospondylus

Spinosauridae Spinosaurus by Joschua Knüppe.png

Megalosauridae
Eustreptospondylinae

Eustreptospondylus Eustrept1DB1 (Flipped).jpg

Megalosaurinae

Duriavenator Duriavenator NT (Flipped).jpg

Megalosaurus Megalosaurus silhouette by Paleogeek.svg

Torvosaurus Torvosaurus tanneri Reconstruction (Flipped).png

Afrovenatorinae

Afrovenator Afrovenator Abakensis by PaleoGeek.jpg

Dubreuillosaurus Dubreuillosaurus NT Flipped.png

Magnosaurus Magnosaurus (Flipped).jpg

Leshansaurus

Piveteausaurus

References[edit]

  1. ^ F. Li; Peng G.; Ye Y.; Jiang S.; and Huang, D. (2009). "A new carnosaur from the Late Jurassic of Qianwei, Sichuan, China". Acta Geologica Sinica 83(9): 1203–1213. Abstract.
  2. ^ Mortimer, M. "Leshansaurus qianweiensis". The Theropod Database. Archived from the original on 19 December 2013. Retrieved 2 March 2013.
  3. ^ M.T. Carrano, R.B.J. Benson, and S.D. Sampson, 2012, "The phylogeny of Tetanurae (Dinosauria: Theropoda)", Journal of Systematic Palaeontology 10(2): 211-300