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Clade
Subclade

Taxon
Taxon
Marginocephalia
Nominal Author
Sereno 1986
2nd Nominal Author
Taxon Status ACTIVE
Comments
Currie and Padian (1997) were first to define Marginocephalia. Independently, Sereno (1998) proposed a very similar definition using genera. Marginocephalia includes two well defined subclades, pachycephalosaurs and ceratopsians. Because there is some uncertainty regarding the monophyly of the clade, negative taxon qualifiers ensure that major external groups will not be included within Marginocephalia. The active definition is a first-order revision of both of these previous definitions.
Potential Synonomy

Active Phylogenetic Definition
Active Definition
The least inclusive clade containing Pachycephalosaurus wyomingensis (Gilmore 1931) and Triceratops horridus Marsh 1889 but excluding Heterodontosaurus tucki Crompton and Charig 1962, Hypsilophodon foxii Huxley 1869, Ankylosaurus magniventris Brown 1908.
Shorthand
< Pachycephalosaurus wyomingensis and Triceratops horridusHeterodontosaurus tucki, Hypsilophodon foxii, Ankylosaurus magniventris.
Definitional Author
Sereno 2005
Definition Status checked
Definition Type NODE
Node-Stem Triplet NODE
Other Triplet Taxa
Pachycephalosauria, Ceratopsia
Specifiers
Specifier(s) A
Pachycephalosaurus wyomingensis
Specifier(s) B
Triceratops horridus
Specifier(s) C
Qualifiers
+Taxon
-Taxon
Heterodontosaurus tucki, Hypsilophodon foxii, Ankylosaurus magniventris
Datum
Taxonomic Content
Publication Year Unknown
Unknown
Unknown
1997

Inactive Taxon Status
Rejection Criteria
Critique
 

Definitional History #1
Earliest Record
Ceratopsia and Pachycephalosauria and all descendants of their most recent common ancestor.
Latest Record
Currie and Padian 1997:415
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Ceratopsia, Pachycephalosauria
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Definitional History #2
Earliest Record
Pachycephalosaurus, Triceratops, their most recent common ancestor and all descendants.
Latest Record
Sereno 1998:62
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Pachycephalosaurus, Triceratops
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