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Xiaotingia
Xiaotingia
is a genus of anchiornithid theropod dinosaur from early Late Jurassic deposits of western Liaoning, China, containing a single species, Xiaotingia
Xiaotingia
zhengi.[1][2]

Contents

1 Discovery 2 Etymology 3 Classification 4 See also 5 References

Discovery[edit]

Size of Xiaotingia

Xiaotingia
Xiaotingia
is known from the holotype STM 27-2, an articulated and almost complete skeleton including the skull. It was probably collected in the Linglongta area, Jianchang, from the Tiaojishan Formation.[1] Etymology[edit] Xiaotingia
Xiaotingia
was first named by Xu Xing, You Hailu, Du Kai and Han Fenglu in 2011 and the type species is Xiaotingia
Xiaotingia
zhengi. The generic name and specific name together honour Zheng Xiaoting.[1] Classification[edit] The initial analysis by Xu et al. showed that Xiaotingia
Xiaotingia
formed a clade with Archaeopteryx, Dromaeosauridae
Dromaeosauridae
and Troodontidae
Troodontidae
to the exclusion of other groups traditionally seen as birds. Xu et al therefore (re)defined the concepts of Deinonychosauria
Deinonychosauria
and Avialae
Avialae
to the extent that Archaeopteryx
Archaeopteryx
and Xiaotingia
Xiaotingia
belonged to the Deinonychosauria
Deinonychosauria
in the clade Archaeopterygidae.[1] This led to popular reports that " Archaeopteryx
Archaeopteryx
is no longer a bird",[3] although Xu et al noted that there are several competing definitions of the clade Aves
Aves
currently in use, pointing out that their definitions are compatible with a traditional Aves
Aves
with Archaeopteryx
Archaeopteryx
as a specifier.[1] This was challenged by an analysis using different methods published several months later however, in which Archaeopteryx was again recovered as an avialan, while Xiaotingia
Xiaotingia
remained closely allied to Anchiornis
Anchiornis
within the Troodontidae.[4] In 2012, an expanded and revised version of the initial analysis also found Archaeopteryx to be avialan and Anchiornis
Anchiornis
to be troodontid, but recovered Xiaotingia
Xiaotingia
as the most primitive member of the clade Dromaeosauridae rather than a close relative of Anchiornis
Anchiornis
within Troodontidae.[5]

Life restoration

Skeletal restoration

Cladogram following the results of a phylogenetic study by Lefèvreet al., 2017.[6]

Pennaraptora

†Oviraptorosauria

Paraves

Scansoriopterygidae

†Xiaotingia

†Yixianosaurus

†Pedopenna

†Aurornis

†Serikornis

†Eosinopteryx

†Anchiornis

Eumaniraptora

Deinonychosauria

†Troodontidae

†Dromaeosauridae

Avialae

†Archaeopteryx

†Rahonavis

†Balaur

†Jeholornithidae

Euavialae

In 2017 re-evaluation of the Harlem Archaeopteryx
Archaeopteryx
specimen, Xiaotingia is found to be an anchiornithid.[2] See also[edit]

Paleontology portal Dinosaurs portal

Timeline of troodontid research

References[edit]

^ a b c d e Xing Xu, Hailu You, Kai Du and Fenglu Han (28 July 2011). "An Archaeopteryx-like theropod from China
China
and the origin of Avialae" (PDF). Nature. 475 (7357): 465–470. doi:10.1038/nature10288. PMID 21796204. CS1 maint: Uses authors parameter (link) ^ a b Foth, C.; Rauhut, O.W.M. (2017). "Re-evaluation of the Haarlem Archaeopteryx
Archaeopteryx
and the radiation of maniraptoran theropod dinosaurs". BMC Evolutionary Biology. 17: 236. doi:10.1186/s12862-017-1076-y.  ^ "Feathers fly in first bird debate". BBC News. 27 July 2011.  ^ Lee, M.S.Y. and Worthy, T.H. (2011). "Likelihood reinstates Archaeopteryx
Archaeopteryx
as a primitive bird". Biology Letters. 8 (2): 299–303. doi:10.1098/rsbl.2011.0884. PMC 3297401 . PMID 22031726. CS1 maint: Multiple names: authors list (link) ^ Senter, P., Kirkland, J.I., DeBlieux, D.D., Madsen, S., and Toth, N. (2012). "New Dromaeosaurids (Dinosauria: Theropoda) from the Lower Cretaceous
Cretaceous
of Utah, and the Evolution of the Dromaeosaurid Tail". PLoS ONE. 7 (5): e36790. doi:10.1371/journal.pone.0036790. PMC 3352940 . PMID 22615813. CS1 maint: Multiple names: authors list (link) ^ Ulysse Lefèvre, Andrea Cau, Aude Cincotta, Dongyu Hu, Anusuya Chinsamy, François Escuillié & Pascal Godefroit (2017). A new Jurassic
Jurassic
theropod from China
China
documents a transitional step in the macrostructure of feathers. The Science of Nature, 104: 74 (advance online publication). doi:10.1007/s00114-017-1496-y

v t e

Anchiornithidae

Kingdom: Animalia Phylum: Chordata Class: Sauropsida Clade: Dinosauria Order: Saurischia Clade: Maniraptora Clade: Paraves Clade: Avialae

Anchiornithidae

Anchiornis Aurornis Caihong Eosinopteryx Ostromia Pedopenna Serikornis Xiaotingia Yixianosaurus

Taxon identifiers

Wd: Q568269 F

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