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Clade
Subclade

Taxon
Taxon
Neornithopoda
Nominal Author
Cooper 1985
2nd Nominal Author
Taxon Status INACTIVE
Comments
Potential Synonomy

Active Phylogenetic Definition
Active Definition
Shorthand
Definitional Author
Definition Status Unknown
Definition Type Unknown
Node-Stem Triplet Unknown
Other Triplet Taxa
Specifiers
Specifier(s) A
Specifier(s) B
Specifier(s) C
Qualifiers
+Taxon
-Taxon
Datum
Taxonomic Content
Publication Year Unknown
Unknown
Unknown

Inactive Taxon Status
Rejection Criteria no definition
Critique
Cooper (1985) coined this taxon for a clade including heterodontosaurids and marginocephalians (pachycephalosaurs, ceratopsians). Although there has never been significant cladistic support for this clade, occasionally heterodontosaurids are shown as related to either marginocephalians or pachycephalosaurs. Should support grow to link these taxa, the taxon would be available. In this compilation, the stem-based defintions of Pachycephalosauria and Ceratopsia are constructed to exclude heterodontosaurids, should such a sister taxon scenario come to pass.
 

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