Luanchuanraptor

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Luanchuanraptor
Temporal range:
Ma
Elements from the holotype fossil 41HIII-0100 displayed at the Giga Dinosaur Exhibition 2017
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauria
Clade: Saurischia
Clade: Theropoda
Family: †Dromaeosauridae
Clade: †Eudromaeosauria
Subfamily: †Velociraptorinae
Genus: †Luanchuanraptor
Lü et al. 2007
Type species
†Luanchuanraptor henanensis
Lü et al. 2007

Luanchuanraptor (meaning "

Luanchuan, Henan. They were medium-sized dromaeosaurids, the first Asian dromaeosaurid taxa described from outside the Gobi Desert
or northeastern China.

Discovery and naming

Reconstructed skeleton at the Giga Dinosaur Exhibition 2017, Chiba

Luanchuanraptor is known from a partial skeleton of an immature individual found at the

chevrons, a right humerus, left scapulocoracoid, the first phalanx from right manus, an isolated manual ungual, right ilium, left pubis, ischium, the sacrum and the shaft of the left femur. These elements come from a moderately sized dromaeosaurid. Its specific name, Luanchuanraptor, is a reference to the Luanchuan County in which the remains were found, and the Latin raptor, meaning thief or seizer. The specific name, henanensis, is a clear referral to the Henan Province.[1]

Description

Life restoration

Luanchuanraptor were moderate-sized dromaeosaurs, estimated at 1.1 to 1.8 m (3.6 to 5.9 ft) long with weights from 2.2 to 2.5 kg (4.9 to 5.5 lb).[2][3] However, the individual 41HIII-0100 preserves an unfused frontal, meaning that it was not a fully-grown animal at the time of death and therefore, they reached slightly larger sizes.[1]

They can be recognised from other dromaeosaur taxa in having a very stiff tail tip as indicated by the short neural spines of the caudal vertebrae, connected anterior chevrons, some posterior caudals with depressions near the neural spine, stocky proximal and posterior end of the chevrons, and a large opening on the coracoid.[1]

Classification

Lü and colleagues assigned Luanchuanraptor to the

Averaptora by Agnolín and Novas,[4] but this suggestion is not widely followed.[5][6] The recently performed phylogenetic analysis for the Dromaeosauridae by Hartman et al. 2019 recovers Luanchuanraptor as a velociraptorine being the sister taxon of Adasaurus. Below is the obtained result for the Eudromaeosauria:[6]

Eudromaeosauria

Paleoenvironment

The remains of Luanchuanraptor were found in the Late Cretaceous

lakes with braided, delta rivers.[7][8] The fauna present on the formation seems to be different from other Asiatic formations, with the well reported occurrences of mammals and lizards like Yubaatar or Funiusaurus. Dinosaurian fauna was present as well, here Luanchuanraptor shared their habitat with other theropods such as Qiupalong, Qiupanykus or Yulong.[9][10][11][8] Large tyrannosaurids have been reported from the formation under the species "Tyrannosaurus" luanchuanensis.[12]

See also

References

  1. ^ a b c d e Lü, J.-C.; Xu, L.; Zhang, X.-L.; Ji, Q.; Jia, S.-H.; Hu, W.-Y.; Zhang, J.-M.; Wu, Y.-H. (2007). "New dromaeosaurid dinosaur from the Late Cretaceous Qiupa Formation of Luanchuan area, western Henan, China". Geological Bulletin of China. 26 (7): 777–786.
  2. ISBN 9780375824197. Genus List for Holtz 2012 Weight Information
  3. ISBN 9780691167664
    .
  4. ISBN 9789400756373
    .
  5. ^ Jasinski, S. E. (2015). "A new dromaeosaurid (Theropoda: Dromaeosauridae) from the Late Cretaceous of New Mexico". Fossil Record 4. New Mexico Museum of Natural History and Science Bulletin. 67: 79–88.
  6. ^
    PMID 31333906
    .
  7. doi:10.1007/s11430-011-4186-1
    .
  8. ^
    doi:10.31035/cg2018005
    .
  9. doi:10.1016/j.cretres.2010.12.004
    .
  10. PMID 23314810
    .
  11. doi:10.1111/1755-6724.12271
    .
  12. ^ Dong, Z. (1979). "Cretaceous dinosaur fossils in southern China" [Cretaceous dinosaurs of the Huanan (south China)]. In Institute of Vertebrate Paleontology and Paleoanthropology; Nanjing Institute of Paleontology (eds.). Mesozoic and Cenozoic Redbeds in Southern China (in Chinese). Beijing: Science Press. pp. 342–350. Translated paper
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