Dinosauria
Ornithischia
Genasauria
Neornithischia
Cerapoda
Ornithopoda
Iguanodontia
Dryomorpha
Ankylopollexia
Styracosterna
Hadrosauriformes
Pronunciation: had-row-sor-uh-forms
Author: Paul Sereno
Year: 1997
Etymology: Hadrosaurus forms
Locomotion: Primarily bipedal
Synonyms: Iguanodontoidea
Author: Paul Sereno
Year: 1997
Etymology: Hadrosaurus forms
Locomotion: Primarily bipedal
Synonyms: Iguanodontoidea
Definition:
The least inclusive clade containing Iguanodon bernissartensis and Parasaurolophus walkeri.
About
Hadrosauriformes was coined by Paul Sereno in 1997 to replace Iguanodontoidea, because having one clade (Iguanodontoidea) contain another one (Hadrosauroidea) with the same suffix ("-oidea" was attached to a superfamily on the now defunct Linnaean ranking system) was just silly. Silly and confusing.
Hadrosauriformes marks the point where ornithopods lost their thumbs, but gained extra teeth and dental batteries, and "duck bills".
Etymology
Hadrosauriformes is derived from the Greek "hadros" (heavy, bulky, sturdy, powerful) and "sauros" (lizard)—for Hadrosaurus (co-anchor of a more exclusive hadrosauriforme family, Hadrosauridae), and the Latin "formes" (form or shaped).
Relationships
References
• Albert Prieto-Marquez (2008) "Phylogeny and historical biogeography of hadrosaurid dinosaurs".
