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| Clade | |
| Subclade | |
| Taxon | |
| Taxon |
Pachycephalosauria
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| Nominal Author | Maryanska and Osmólska 1974 |
| 2nd Nominal Author | |
| Taxon Status | ACTIVE |
| Comments | The active definition is a first-order revision of that initially proposed by Sereno (1998) and revised recently by Maryanska et al. (2004). Unlike these earlier versions, it includes several other species as external specifiers to maintain taxonomic content in the face of alternative phylogenetic arrangements. Ceratopsians may be the nearest outgroup, but this is far from certain. |
| Potential Synonomy | |
| Active Phylogenetic Definition | |
| Active Definition |
The most inclusive clade containing Pachycephalosaurus wyomingensis (Gilmore 1931) but not Triceratops horridus Marsh 1889, Heterodontosaurus tucki Crompton and Charig 1962, Hypsilophodon foxii Huxley 1869, Ankylosaurus magniventris Brown 1908.
|
| Shorthand |
> Pachycephalosaurus wyomingensis but not Triceratops horridus, Heterodontosaurus tucki, Hypsilophodon foxii, Ankylosaurus magniventris. |
| Definitional Author |
Sereno 2005 |
| Definition Status | checked |
| Definition Type | STEM |
| Node-Stem Triplet | STEM |
| Other Triplet Taxa |
Marginocephalia, Ceratopsia |
| Specifiers | |
| Specifier(s) A |
Pachycephalosaurus wyomingensis |
| Specifier(s) B | |
| Specifier(s) C |
Triceratops horridus, Heterodontosaurus tucki, Hypsilophodon foxii, Ankylosaurus magniventris
|
| Qualifiers | |
| +Taxon | |
| -Taxon | |
| Datum | |
| Taxonomic Content | |
| Publication Year |
Unknown Unknown Unknown 1998 |
| Inactive Taxon Status | |
| Rejection Criteria | |
| Critique | |
| Definitional History #1 | |
| Earliest Record | All marginocephalians closer to Pachycephalosaurus than to Triceratops. |
| Latest Record | Sereno 1998:62 |
| Range (My) | |
| Range (My) |
Pachycephalosaurus, Triceratops |
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| Definitional History #2 | |
| Earliest Record | All the taxa more closely related to Pachycephalosaurus wyomingensis than to Triceratops horridus. |
| Latest Record | Maryanska et al. 2004:464 |
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| Range (My) |
Pachycephalosaurus wyomingensis,Triceratops horridus |
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