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Clade
Subclade

Taxon
Taxon
Hypsilophodontidae
Nominal Author
Dollo 1882
2nd Nominal Author
Taxon Status ACTIVE
Comments
This clade has been recognized for some time as a monophyletic assemblage of basal ornithopods, although united by only a few synapomorphies (Sereno 1986). Some recent cladistic analyses, in contrast, have challenged hypsilophodontid monophyly (e.g. Winkler et al. 1998, Weishampel et al. 2003). Norman et al. (2004), for example, found traditional hypsilophodontids to represent a paraphyletic grade basal to Iguanodontia. The name is probably best defined as it is here, to include any taxxa most closely related to the nominotypical genus Hypsilophodon, however that may sort out in future analyses.
Potential Synonomy

Active Phylogenetic Definition
Active Definition
The most inclusive clade containing Hypsilophodon foxii Huxley 1869 but not Parasaurolophus walkeri Parks 1922.
Shorthand
> Hypsilophodon foxii but not Parasaurolophus walkeri.
Definitional Author
Sereno 2005
Definition Status checked
Definition Type STEM
Node-Stem Triplet NO
Other Triplet Taxa
Specifiers
Specifier(s) A
Hypsilophodon foxii
Specifier(s) B
Specifier(s) C
Parasaurolophus walkeri
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 Hypsilophodon than to Parasaurolophus.
Latest Record
Sereno 1998:61
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Hypsilophodon, Parasaurolophus
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