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250px-Xiaotingia fossil
Xiaotingia

Temporal range: Late Jurassic, 160 MaPreЄ

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Type specimen
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Clade: Dinosauria
Order: Saurischia
Suborder: Theropoda
Genus: Xiaotingia

Xu et al., 2011

Species: X. zhengi
Binomial name
Xiaotingia zhengi

Xu et al., 2011

Xiaotingia is a genus of avialan theropoddinosaur from early Late Jurassicdeposits of western Liaoning, China, containing a single species, Xiaotingia zhengi.[1]

Discovery[]

Xiaotingia is known from the holotypeSTM 27-2, an articulated and almost complete skeleton including the skull. It was probably collected in the Linglongta area, Jianchang, from theTiaojishan Formation.[1]

Etymology[]

Xiaotingia was first named by Xu Xing,You Hailu, Du Kai and Han Fenglu in2011 and the type species is Xiaotingia zhengi. The generic name and specific name together honour Zheng Xiaoting.[1]

Description[]

Classification[]

The initial analysis by Xu et al. showed that Xiaotingia formed a clade withArchaeopteryx, Dromaeosauridae andTroodontidae to the exclusion of other groups traditionally seen as birds. Xu et al therefore (re)defined the concepts ofDeinonychosauria and Avialae to the extent that Archaeopteryx and Xiaotingiabelonged to the Deinonychosauria in the clade Archaeopterygidae.[1] This led to popular reports that "Archaeopteryx is no longer a bird",[2] although Xu et al noted that there are several competing definitions of the clade Aves currently in use, pointing out that their definitions are compatible with a traditional Aveswith Archaeopteryx as a specifier.[1] This was challenged by an analysis using different methods published several months later however, in whichArchaeopteryx was again recovered as an avialan, while Xiaotingia remained closely allied to Anchiornis within the Troodontidae.[3] In 2012, an expanded and revised version of the initial analysis also found Archaeopteryx to be avialan and Anchiornis to be troodontid, but recovered Xiaotingia as the most primitive member of the cladeDromaeosauridae rather than a close relative of Anchiornis within Troodontidae.[4]

220px-Xiaotingia

Relationships found by the revised analysis of Senter et al., 2012:[4]

Paraves

Avialae

Deinonychosauria

Troodontidae

Dromaeosauridae

Xiaotingia



Unenlagiinae



Shanag



Microraptoria


Eudromaeosauria







Below is a cladogram published in 2013 by Godefroit et al.[5]

Avialae

Aurornis



Anchiornis



Archaeopteryx



Xiaotingia




Shenzhouraptor


Rahonavis


Euavialae

Balaur



Avebrevicauda







Gallery[]

220px-Xiaotingia by Qilong
170px-Xiaotingia SIZE
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