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A New Oviraptorid Dinosaur (Dinosauria: Oviraptorosauria) from the Late Cretaceous of Southern China and Its Paleobiogeographical Implications.

Lü J, Pu H, Kobayashi Y, Xu L, Chang H, Shang Y, Liu D, Lee YN, Kundrát M, Shen C - Sci Rep (2015)

Bottom Line: A phylogenetic analysis recovers the new taxon as closely related to the Mongolian Citipati.Six oviraptorid dinosaurs from the Nanxiong Formation (Ganzhou and Nanxiong) are distributed within three clades of the family.Each of the three clades from the Nanxiong Formation has close relatives in Inner Mongolia and Mongolia, and in both places each clade may have had a specific diet or occupied a different ecological niche.

View Article: PubMed Central - PubMed

Affiliation: Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China; Key Lab of Stratigraphy and Paleontology, Ministry of Land and Resources of China, Beijing 100037, China.

ABSTRACT
The Ganzhou area of Jiangxi Province, southern China is becoming one of the most productive oviraptorosaurian localities in the world. A new oviraptorid dinosaur was unearthed from the uppermost Upper Cretaceous Nanxiong Formation of Ganzhou area. It is characterized by an anterodorsally sloping occiput and quadrate (a feature shared with Citipati), a circular supratemporal fenestra that is much smaller than the lower temporal fenestra, and a dentary in which the dorsal margin above the external mandibular fenestra is strongly concave ventrally. The position of the anteroventral corner of the external naris in relation to the posterodorsal corner of the antorbital fenestra provides new insight into the craniofacial evolution of oviraptorosaurid dinosaurs. A phylogenetic analysis recovers the new taxon as closely related to the Mongolian Citipati. Six oviraptorid dinosaurs from the Nanxiong Formation (Ganzhou and Nanxiong) are distributed within three clades of the family. Each of the three clades from the Nanxiong Formation has close relatives in Inner Mongolia and Mongolia, and in both places each clade may have had a specific diet or occupied a different ecological niche. Oviraptorid dinosaurs were geographically widespread across Asia in the latest Cretaceous and were an important component of terrestrial ecosystems during this time.

No MeSH data available.


Skull comparisons of oviraptorosaurs showing relative positions of the posterodorsal corner of the antorbital fenestra and the anteroventral corner of the external narial opening.A: Incisivosaurus gauthieri; B: Conchoraptor gracilis; C: Wulatelong gobiensis; (no scale) D: Banji long; E: Anzu wyliei; F: Khaan mckennai; G: Citipati osmolskae; (no scale) H: Huanansaurus ganzhouensis (reversed); I: Yulong mini; J: Oviraptor philoceratops; K: Nemegtomaia barsboldi; L: “Oviraptor” mongoliensis. A, B, F, G, J, K, and L are from Lü14; C is modified from Xu et al.27; D is modified from Xu and Han21; E is modified from Lamanna et al.39 (reversed) and I is from Lü et al.25. External narial opening is in red, and antorbital fenenstra is in yellow. Note: The horizontal line projected through the posterodorsal corner of the antorbital fenestra is parallel to the line linking the articular end of the quadrate and the ventral margin of the premaxillae.
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f4: Skull comparisons of oviraptorosaurs showing relative positions of the posterodorsal corner of the antorbital fenestra and the anteroventral corner of the external narial opening.A: Incisivosaurus gauthieri; B: Conchoraptor gracilis; C: Wulatelong gobiensis; (no scale) D: Banji long; E: Anzu wyliei; F: Khaan mckennai; G: Citipati osmolskae; (no scale) H: Huanansaurus ganzhouensis (reversed); I: Yulong mini; J: Oviraptor philoceratops; K: Nemegtomaia barsboldi; L: “Oviraptor” mongoliensis. A, B, F, G, J, K, and L are from Lü14; C is modified from Xu et al.27; D is modified from Xu and Han21; E is modified from Lamanna et al.39 (reversed) and I is from Lü et al.25. External narial opening is in red, and antorbital fenenstra is in yellow. Note: The horizontal line projected through the posterodorsal corner of the antorbital fenestra is parallel to the line linking the articular end of the quadrate and the ventral margin of the premaxillae.

Mentions: Huanansaurus differs from Citipati11 in that the parietal is much shorter along the midline than the frontal, the ascending process of the jugal extends posterodorsally, and the ventral margin of the posterodorsal process of the dentary above the external mandibular fenestra is strongly concave. The upper margin of the lower temporal fenestra in Citipati11 is nearly equal to that of the ventral margin making the lower temporal fenestra nearly rectangular, whereas the lower temporal fenestra is nearly triangular in Huanansaurus (Fig. 3, Fig. 4).


A New Oviraptorid Dinosaur (Dinosauria: Oviraptorosauria) from the Late Cretaceous of Southern China and Its Paleobiogeographical Implications.

Lü J, Pu H, Kobayashi Y, Xu L, Chang H, Shang Y, Liu D, Lee YN, Kundrát M, Shen C - Sci Rep (2015)

Skull comparisons of oviraptorosaurs showing relative positions of the posterodorsal corner of the antorbital fenestra and the anteroventral corner of the external narial opening.A: Incisivosaurus gauthieri; B: Conchoraptor gracilis; C: Wulatelong gobiensis; (no scale) D: Banji long; E: Anzu wyliei; F: Khaan mckennai; G: Citipati osmolskae; (no scale) H: Huanansaurus ganzhouensis (reversed); I: Yulong mini; J: Oviraptor philoceratops; K: Nemegtomaia barsboldi; L: “Oviraptor” mongoliensis. A, B, F, G, J, K, and L are from Lü14; C is modified from Xu et al.27; D is modified from Xu and Han21; E is modified from Lamanna et al.39 (reversed) and I is from Lü et al.25. External narial opening is in red, and antorbital fenenstra is in yellow. Note: The horizontal line projected through the posterodorsal corner of the antorbital fenestra is parallel to the line linking the articular end of the quadrate and the ventral margin of the premaxillae.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4489096&req=5

f4: Skull comparisons of oviraptorosaurs showing relative positions of the posterodorsal corner of the antorbital fenestra and the anteroventral corner of the external narial opening.A: Incisivosaurus gauthieri; B: Conchoraptor gracilis; C: Wulatelong gobiensis; (no scale) D: Banji long; E: Anzu wyliei; F: Khaan mckennai; G: Citipati osmolskae; (no scale) H: Huanansaurus ganzhouensis (reversed); I: Yulong mini; J: Oviraptor philoceratops; K: Nemegtomaia barsboldi; L: “Oviraptor” mongoliensis. A, B, F, G, J, K, and L are from Lü14; C is modified from Xu et al.27; D is modified from Xu and Han21; E is modified from Lamanna et al.39 (reversed) and I is from Lü et al.25. External narial opening is in red, and antorbital fenenstra is in yellow. Note: The horizontal line projected through the posterodorsal corner of the antorbital fenestra is parallel to the line linking the articular end of the quadrate and the ventral margin of the premaxillae.
Mentions: Huanansaurus differs from Citipati11 in that the parietal is much shorter along the midline than the frontal, the ascending process of the jugal extends posterodorsally, and the ventral margin of the posterodorsal process of the dentary above the external mandibular fenestra is strongly concave. The upper margin of the lower temporal fenestra in Citipati11 is nearly equal to that of the ventral margin making the lower temporal fenestra nearly rectangular, whereas the lower temporal fenestra is nearly triangular in Huanansaurus (Fig. 3, Fig. 4).

Bottom Line: A phylogenetic analysis recovers the new taxon as closely related to the Mongolian Citipati.Six oviraptorid dinosaurs from the Nanxiong Formation (Ganzhou and Nanxiong) are distributed within three clades of the family.Each of the three clades from the Nanxiong Formation has close relatives in Inner Mongolia and Mongolia, and in both places each clade may have had a specific diet or occupied a different ecological niche.

View Article: PubMed Central - PubMed

Affiliation: Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China; Key Lab of Stratigraphy and Paleontology, Ministry of Land and Resources of China, Beijing 100037, China.

ABSTRACT
The Ganzhou area of Jiangxi Province, southern China is becoming one of the most productive oviraptorosaurian localities in the world. A new oviraptorid dinosaur was unearthed from the uppermost Upper Cretaceous Nanxiong Formation of Ganzhou area. It is characterized by an anterodorsally sloping occiput and quadrate (a feature shared with Citipati), a circular supratemporal fenestra that is much smaller than the lower temporal fenestra, and a dentary in which the dorsal margin above the external mandibular fenestra is strongly concave ventrally. The position of the anteroventral corner of the external naris in relation to the posterodorsal corner of the antorbital fenestra provides new insight into the craniofacial evolution of oviraptorosaurid dinosaurs. A phylogenetic analysis recovers the new taxon as closely related to the Mongolian Citipati. Six oviraptorid dinosaurs from the Nanxiong Formation (Ganzhou and Nanxiong) are distributed within three clades of the family. Each of the three clades from the Nanxiong Formation has close relatives in Inner Mongolia and Mongolia, and in both places each clade may have had a specific diet or occupied a different ecological niche. Oviraptorid dinosaurs were geographically widespread across Asia in the latest Cretaceous and were an important component of terrestrial ecosystems during this time.

No MeSH data available.