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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.


Partial forelimb and hindlimb of Huanansaurus ganzhouensis (HGM41HIII-0443) gen. et sp. nov.Abbreviations: f., femur; h., humerus; mtt., metatarsals; pu., pedal ungual; ra., radius; ti., tibia. Scale bar = 5 cm.
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f5: Partial forelimb and hindlimb of Huanansaurus ganzhouensis (HGM41HIII-0443) gen. et sp. nov.Abbreviations: f., femur; h., humerus; mtt., metatarsals; pu., pedal ungual; ra., radius; ti., tibia. Scale bar = 5 cm.

Mentions: The distal portion of the right femur is preserved and it naturally articulated with the proximal end of the right tibia (Fig. 5). The proximal end of the tibia has a distinct cnemial crest. The proximal ends of the metatarsals are missing. Only the dorsal surfaces of the metatarsals are exposed, and the ventral surfaces cannot be observed. Metatarsal III is the most robust and longest of the metatarsals. The distal end of metatarsal III is expanded mediolaterally and is nearly flat on its dorsal surface. The distal end of metatarsal IV is narrow with a convex dorsal surface. The third digit is the longest one. Phalanx III-1 is the stoutest of all. All phalanges have collateral ligament pits. However, the collateral ligament pits on the phalanges of digits III and IV are much deeper than these of the digit II. The pedal unguals are more slender than the manual unguals, and are also weakly curved. The proximal end of each pedal ungual extends strongly posterodorsally. The wide articular ends may have permitted hyperextension of the unguals. The grooves on the medial surfaces of the unguals are more distinct distally than proximally. The ungual of the fourth digit is more curved than the other pedal unguals.


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)

Partial forelimb and hindlimb of Huanansaurus ganzhouensis (HGM41HIII-0443) gen. et sp. nov.Abbreviations: f., femur; h., humerus; mtt., metatarsals; pu., pedal ungual; ra., radius; ti., tibia. Scale bar = 5 cm.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f5: Partial forelimb and hindlimb of Huanansaurus ganzhouensis (HGM41HIII-0443) gen. et sp. nov.Abbreviations: f., femur; h., humerus; mtt., metatarsals; pu., pedal ungual; ra., radius; ti., tibia. Scale bar = 5 cm.
Mentions: The distal portion of the right femur is preserved and it naturally articulated with the proximal end of the right tibia (Fig. 5). The proximal end of the tibia has a distinct cnemial crest. The proximal ends of the metatarsals are missing. Only the dorsal surfaces of the metatarsals are exposed, and the ventral surfaces cannot be observed. Metatarsal III is the most robust and longest of the metatarsals. The distal end of metatarsal III is expanded mediolaterally and is nearly flat on its dorsal surface. The distal end of metatarsal IV is narrow with a convex dorsal surface. The third digit is the longest one. Phalanx III-1 is the stoutest of all. All phalanges have collateral ligament pits. However, the collateral ligament pits on the phalanges of digits III and IV are much deeper than these of the digit II. The pedal unguals are more slender than the manual unguals, and are also weakly curved. The proximal end of each pedal ungual extends strongly posterodorsally. The wide articular ends may have permitted hyperextension of the unguals. The grooves on the medial surfaces of the unguals are more distinct distally than proximally. The ungual of the fourth digit is more curved than the other pedal unguals.

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.