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Clade
Subclade

Taxon
Taxon
Iguanodontia
Nominal Author
Dollo 1888
2nd Nominal Author
Taxon Status ACTIVE
Comments

Iguanodontia was first defined by Sereno (1998) to include all ornithopods closer to hadrosaurids than to hypsilophodontids. Since that time, some analyses have shown Hypsilophodontidae as paraphyletic, with some genera closer to hadrosaurids than others (e.g. Weishampel et al. 2003). To accommodae these alternative hypotheses while maintaining stability in taxonomic content, Thescelosaurus neglectus is added to the definition as an external specifier.

Gasparinisaura concosaltensis was originally described as an iguanodontian (Coria and Salgado 1996) but has since been positioned among hypsilophodontids (Weishampel et al. 2003). Gasparinisaura thus is not included as a specifier.

Potential Synonomy

Active Phylogenetic Definition
Active Definition
The most inclusive clade containing Parasaurolophus walkeri Parks 1922 but not Hypsilophodon foxii Huxley 1869, Thescelosaurus neglectus Gilmore 1913.
Shorthand
> Parasaurolophus walkeri but not Hypsilophodon foxii, Thescelosaurus neglectus.
Definitional Author
Sereno 2005
Definition Status checked
Definition Type STEM
Node-Stem Triplet NO
Other Triplet Taxa
Specifiers
Specifier(s) A
Parasaurolophus walkeri
Specifier(s) B
Specifier(s) C
Hypsilophodon foxii, Thescelosaurus neglectus
Qualifiers
+Taxon
-Taxon
Datum
Taxonomic Content
Publication Year Unknown
Unknown
Unknown
1998

Inactive Taxon Status
Rejection Criteria
Critique
 

Definitional History #1
Earliest Record
All euornithopods closer to Parasaurolophus than to Hypsilophodon.
Latest Record
Sereno 1998:61
Range (My)
Range (My)
Parasaurolophus, Hypsilophodon
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Definitional History #2
Earliest Record
All euornithopods closer to Edmontosaurus than to Thescelosaurus.
Latest Record
Norman 2004:413
Range (My)
Range (My)
Edmontosaurus, Thescelosaurus.
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Definitional History #3
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Definitional History #10
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