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iHadrosauroids
Fossil range: Cretaceous
Ouranosaurus
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Sauropsida
Superorder: Dinosauria
Order: Ornithischia
Suborder: Ornithopoda
Infraorder: Iguanodontia
Superfamily: Hadrosauroidea
Cope, 1869
Families

Hadrosauroidea is a clade or superfamily of ornithischian dinosaurs that includes the "duck-billed" dinosaurs, or hadrosaurids, nd their close relatives. Many primitive hadrosauroids, such as the sail-backed Ouranosaurus, have traditionally been included in a paraphyletic (unnatural grouping) "Iguanodontide". With cladistic analysis, the traditonal Iguanodontidae has been largely disbanded, and probably includes only Iguanodon and perhaps its closest relatives.

Classification

Taxonomy

Phylogeny

Cladogram after Norman (2002) and Godefroit, Li & Shang (2005).

Hadrosauroidea
|--Penelopognathus
|--+--Altirhinus
|  `--Eolambia
`--+--Protohadros
   `--+--Probactrosaurus
      `--Hadrosauridae
         |--Telmatosaurus
         `--+--Bactrosaurus
            `--Euhadrosauria
               |--Hadrosaurinae
               `--Lambeosaurinae

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