Hadrosauromorpha
| Hadrosauromorphs Temporal range: Late Cretaceous, 96.7–66 Ma |
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| Skeleton of Bactrosaurus | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Clade: | Dinosauria |
| Order: | †Ornithischia |
| Suborder: | †Ornithopoda |
| Clade: | †Hadrosauriformes |
| Superfamily: | †Hadrosauroidea |
| Clade: |
†Hadrosauromorpha Norman, 2015 vide Norman, 2014 |
| Subgroups | |
Hadrosauromorpha is a cohort of iguanodontian ornithopods, defined in 2014 by David B. Norman to divide Hadrosauroidea into the basal taxa with compressed manual bones and a , and the derived taxa that lack them. The clade is defined as all the taxa closer to Edmontosaurus regalis than Probactrosaurus gobiensis. This results in different taxon inclusion depending on the analysis.
Hadrosauromorpha was first used in literature by David B. Norman in 2014 in a discussion of phylogenetics of Hypselospinus. In his 2014 paper Norman references another of his publications as the authority for Hadrosauromorpha, a chapter in the book Hadrosaurs. However, the book was in fact published later, in 2015. Following Article 19.4 of the PhyloCode, the authorship of the clade is thus Norman (2015), while the authorship of the definition is Norman (2014).
Hadrosauromorpha was defined by Norman (2014 and 2015) as hadrosauroid taxa closer to Edmontosaurus regalis than Probactrosaurus gobiensis. This definition was contested by Mickey Mortimer, who stated that to follow the PhyloCode the taxon Hadrosaurus must be included in the definition, as it is the type genus of Hadrosauromorpha. By this definition, Norman (2015) considered Hadrosauromorpha to include Hadrosauridae, as well as the taxa Tethyshadros and Bactrosaurus. Norman in 2014 had included more taxa in Hadrosauromorpha, those of Norman (2015) as well as Levnesovia, Gilmoreosaurus and Telmatosaurus, the last of which was considered inside Hadrosauridae by Norman in 2015. Another phylogenetic analysis by Xing et al. in 2014 also found that Eolambia and Protohadros, both found outside Hadrosauromorpha by Norman, fell within his definition, as well as a large number of other taxa.
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