Name Bayannurosaurus
Order Ornithischia
Suborder Cerapoda
Class Dinosauria
Name Translation Bayannur Lizard
Period Early Cretaceous
Location China
Diet Plants, carrion?
Size 5 meters (16 ft) long?

Bayannurosaurus (meaning "Bayannur Lizard") is an extinct genus of ankylopollexian that lived during the Early Cretaceous Bayin-Gobi Formation, about 112-100 million years ago. The type species, Bayannurosaurus perfectus, was named and described in 2018.[1]


A presumably mostly quadrupedal ankylopollexian iguanodontian, Bayannurosaurus perfectus is represented by an excellently well-preserved skeleton. The diagnosis of the taxon includes several autapomorphies, notably a dorsally directed, strap-like posterodorsal process of the jugal and a horizontally oriented preacetabular process of the ilium. The nearly complete caudal series retains eight posterior-most caudals with procoelous, trapezoidal centra in dorsal view, and the last three caudals are fully fused. The discovery of B. perfectus opens a critical new window on the early evolution and intercontinental dispersal of Iguanodontia. The skeleton displays a transitional morphology between non-hadrosauriform ankylopollexians and Hadrosauriformes. A phylogenetic analysis indicates that Bayannurosaurus is positioned higher on the tree than Hypselospinus, but below Ouranosaurus just outside of Hadrosauriformes. The tree topology of Iguanodontia with temporal and spatial constraints reveals a possible biogeographic scenario supported by the statistical dispersal-vicariance analysis: around the J/K boundary, non-hadrosauriform ankylopollexians experienced multiple dispersal events from Europe to Asia, accompanying the coeval fall of the global sea level.



  1. (2018) "A large-sized basal ankylopollexian from East Asia, shedding light on early biogeographic history of Iguanodontia". Science Bulletin in press. DOI:10.1016/j.scib.2018.03.016.