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

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

[edit] Classification

[edit] Taxonomy

• Superfamily Hadrosauroidea
  • ?Nanyangosaurus
  • ?Jinzhousaurus
  • ?Equijubus
  • ?Shuangmiaosaurus
  • Ouranosaurus
  • Fukuisaurus
  • Penelopognathus
  • Altirhinus
  • Eolambia
  • Protohadros
  • Probactrosaurus
  • Cedrorestes
  • Family Hadrosauridae

[edit] Phylogeny

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

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