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Clade
Subclade

Taxon
Taxon
Pachycephalosaurini
Nominal Author
Sternberg 1945
2nd Nominal Author
Sullivan 2003
Taxon Status ACTIVE
Comments
Pachycephalosaurini is a family-group name first used by Sullivan (2000:198). Sullivan attempted to constuct an “apomorphy-based” definition but failed to include an internal specifier (“pachycephalosaurids with nodes in large clusters on squamosals (hypernoded forms) and nasals”). This is potentially a useful clade, including the largest species of pachycephalosurians in western North America, a group that may well become more diversified over time. A node-based definition is proposed here based on the two best known species.
Potential Synonomy

Active Phylogenetic Definition
Active Definition
The least inclusive clade containing Pachycephalosaurus wyomingensis (Gilmore 1931) and Stygimoloch spinifer Galton and Sues 1983.
Shorthand
< Pachycephalosaurus wyomingensis and Stygimoloch spinifer.
Definitional Author
Sereno 2005
Definition Status ORIGINAL
Definition Type NODE
Node-Stem Triplet NO
Other Triplet Taxa
Specifiers
Specifier(s) A
Pachycephalosaurus wyomingensis
Specifier(s) B
Stygimoloch spinifer
Specifier(s) C
Qualifiers
+Taxon
-Taxon
Datum
Taxonomic Content
Publication Year Unknown
Unknown
Unknown
2005

Inactive Taxon Status
Rejection Criteria
Critique
 

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