†unranked clade Hadrosauria Horner 1990 (ornithopod)
Full reference: J. R. Horner. 1990. Evidence of a diphyletic origination of the hadrosaurian (Reptilia: Ornithischia) dinosaurs. K. Carpenter and P. J. Currie (eds.), Dinosaur Systematics: Perspectives and Approaches, Cambridge University Press, Cambridge 179-187
Parent taxon: Iguanodontoidea according to J. R. Horner 1990
Sister taxa: Craspedodon, Iguanodon orientalis, Lambeosauria, Lurdusaurus
Subtaxa: none
Ecology: ground dwelling herbivore
Distribution:
• Cretaceous of Brazil (1 collection), Canada (1: Alberta), South Korea (3), Spain (3), United States (1: Texas)
Total: 9 collections each including a single occurrence