†unranked clade Hadrosauriformes Sereno 1997 (ornithopod)
Full reference: P. C. Sereno. 1997. The origin and evolution of dinosaurs. Annual Review of Earth and Planetary Sciences 25:435-489
Parent taxon: Styracosterna according to A. T. McDonald 2012
See also Bertozzo et al. 2025, McDonald et al. 2010, McDonald et al. 2010, Sereno 1997, Sereno 1998, Sereno 1999, Shibata et al. 2015, Verdú et al. 2021, Wang et al. 2017 and You et al. 2005
Sister taxa: Calvarius, Cumnoria, Dakotadon, Delapparentia, Draconyx, Hippodraco, Iguanacolossus, Istiorachis, Lanzhousaurus, Magnamanus, Napaisaurus, Paulodon, Riabininohadros, Theiophytalia
Subtaxa: Brighstoneus Comptonatus Hadrosauroidea Proa Siamodon
Ecology: ground dwelling herbivore