TABLE 1. A in Phylogeny of iguanodontian dinosaurs and the evolution of quadrupedality

TABLE 1. A summary of the most recent phylogenetic definitions for higher order taxa given by Sereno and Norman.
DefinitionCladeSereno 2005Norman 2014bOrnithopodaThe least inclusive clade containing Heterodontosaurus tucki Crompton and Charig, 1962 and Parasaurolophus walkeri Parks, 1922 but excluding Pachycephalosaurus wyomingensis (Gilmore, 1931), Triceratops horridus Marsh, 1889, Ankylosaurus magniventris Brown, 1908.Stem-based: all cerapodans closer to Edmontosaurus than to Triceratops (Norman et al., 2004).EuornithopodaThe most inclusive clade containing Parasaurolophus walkeri Parks 1922, but not Heterodontosaurus tucki Crompton and Charig, 1962, Pachycephalosaurus wyomingensis (Gilmore, 1931), Triceratops horridus Marsh, 1889, Ankylosaurus magniventris Brown, 1908.IguanodontiaThe most inclusive clade containing Parasaurolophus walkeri Parks, 1922 but not Hypsilophodon foxii Huxley, 1869, or Thescelosaurus neglectus Gilmore, 1913.Stem-based: Edmontosaurus regalis and all taxa more closely related to E. regalis than to the taxa subtended to the clade (Hypsilophodontia) that includes Hypsilophodon foxii and Tenontosaurus tilletti.DryomorphaThe most inclusive clade containing Dryosaurus altus (Marsh, 1878) and Parasaurolophus walkeri Parks, 1922AnkylopollexiaThe least inclusive clade containing Camptosaurus dispar (Marsh, 1879) and Parasaurolophus walkeri Parks, 1922.Stem-based: Edmontosaurus regalis and all taxa more closely related to E. regalis than to Dryosaurus altus.StyracosternaThe most inclusive clade containing Parasaurolophus walker Parks, 1922 but not Camptosaurus dispar (Marsh, 1879).Node-based: Batyrosaurus rozhdestvenskyi, Edmontosaurus regalis, their common ancestor, and all of its descendants.HadrosauroideaThe most inclusive taxon containing Parasaurolophus walkeri Parks, 1922 but not Iguanodon bernissartensis Boulenger, 1881.HadrosauridaeThe least inclusive taxon containing Saurolophus osborni Brown, 1912 and Parasaurolophus walkeri Parks, 1922 and including Hadrosaurus foulkii Leidy, 1858.Euhadrosauria Node-based: Parasaurolophus, Saurolophus, Edmontosaurus, their most recent common ancestor, and all of its descendants.