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Clade
Subclade

Taxon
Taxon
Homalocephaloidea
Nominal Author
Dong 1978
2nd Nominal Author
Sereno 1986
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 junior synonym
Critique
Maryanska et al. (2004) first defined this taxon, which in their analysis includes Homalocephale, Ornatotholus, Stygimoloch, Stegoceras, Tylocephale, Prenocephale, and Pachycephalosaurus. This clade differs from their Goyocephala only by the exclusion of Goyocephale. They erroneously attributed the taxon to Sereno 1986, who was first to use the superfamily but not the first to name the family group, which was coined by Dong (1978). Futhermore, Maryanska et al. (2004) placed within this superfamily the family Pachycephalosauridae, which is incorrect. Pachycephalosauroidea Sternberg 1945 would have precedence, even though the superfamily had not been previously used. There seems little reason at this point to interject another nominotypical family at the base of Pachycephalosauria, when nearly all of the speices are singleton taxa on available cladgrams. If there is a need for a further subdivision, Pachycephalosauroidea is available.
 

Definitional History #1
Earliest Record
The most recent common ancestor of Homalocephale and Pachycephalosaurus and all of its descendants.
Latest Record
Maryanska, Champan, and Weishampel 2004:474
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Homalocephale, Pachycephalosaurus
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