Tongnanlong
From Chinese Tongnan (Tongnan District, Chongqing) combined with Chinese long, "dragon" — means "Tongnan District dragon"
Tongnanlong is a genus of mamenchisaurid dinosaur from the Late Jurassic Suining Formation of Chongqing, China. The type species is Tongnanlong zhimingi.
Diagnosis
- Dorsal centra opisthocoelous with camerate pneumatic structures
- Well-developed spinopostzygapophysial laminae and fossae on dorsal vertebrae
- Small laminae dividing pleurocoels on dorsal centra
- Anterior caudal centra procoelous with posterodorsally-oriented neural spines
- Fossa developed between postzygapophysis and hyposphene on anterior caudal vertebrae
- S-shaped suture of scapula and coracoid, forming obtuse glenoid angle
Species
Tongnanlong zhimingi Wei et al., 2025
Type species
Named for prominent Chinese paleontologist Dong Zhiming.
- Holotype
- TNM 0254 , Tongnan Museum
- Material
- Three dorsal and six caudal vertebrae, left shoulder girdle (scapula and coracoid), partial tibia, fibula, three metatarsals, and two unguals
- Horizon
- lower Suining Formation, Late Jurassic
- Locality
- building site of Dafo Street, Chongqing, China
References
- Wei, X.; Tan, Y.; Jiang, S.; Ding, J.; Li, L.; Wang, X.; Liu, Y.; Wei, G.; Li, D.; Liu, Y.; Peng, G.; Zhang, S.; Lao, C. (2025). A new mamenchisaurid from the Upper Jurassic Suining Formation of the Sichuan Basin in China and its implication on sauropod gigantism. Scientific Reports 15(1). Springer Science and Business Media LLC. doi:10.1038/s41598-025-09796-0 wei2025a