Clade | |
Subclade |
Taxon | |
Taxon |
Ceratopsia
|
Nominal Author | Marsh 1890 |
2nd Nominal Author | |
Taxon Status | ACTIVE |
Comments | Ceratopsia was defined independently, first by Dodson (1997) and later by Sereno (1998), both authors proposing similar stem-based definitions. The active definition is a first-order revision using species as specifiers and including several additional external specifiers. These extra specifiers insure stability of taxonomic content, given the paucity of data that currently establishes Pachycephalosauria as the immediate outgroup. |
Potential Synonomy | Ceratopia (Charig 1979, spelling variant) |
Active Phylogenetic Definition | |
Active Definition |
The most inclusive clade including Triceratops horridus Marsh 1889 but not Pachycephalosaurus wyomingensis (Gilmore 1931), Heterodontosaurus tucki Crompton and Charig 1962, Hypsilophodon foxii Huxley 1869, Ankylosaurus magniventris Brown 1908.
|
Shorthand |
> Triceratops horridus but not Pachycephalosaurus wyomingensis, Heterodontosaurus tucki, Hypsilophodon foxii, Ankylosaurus magniventris. |
Definitional Author |
Sereno 2005 |
Definition Status | checked |
Definition Type | STEM |
Node-Stem Triplet | STEM |
Other Triplet Taxa |
Marginocephalia, Pachycephalosauria |
Specifiers | |
Specifier(s) A |
Triceratops horridus |
Specifier(s) B | |
Specifier(s) C |
Pachycephalosaurus wyomingensis, Heterodontosaurus tucki, Hypsilophodon foxii, Ankylosaurus magniventris
|
Qualifiers | |
+Taxon | |
-Taxon | |
Datum | |
Taxonomic Content | |
Publication Year |
Unknown Unknown Unknown 1997 |
Inactive Taxon Status | |
Rejection Criteria | |
Critique | |
Definitional History #1 | |
Earliest Record | All Marginocephalia closer to Ceratopsidae than to Pachycephalosauridae. |
Latest Record | Dodson 1997:106 |
Range (My) | |
Range (My) |
Ceratopsidae, Pachycephalosauridae |
Range (My) |
Definitional History #2 | |
Earliest Record | All marginocephalians closer to Triceratops than to Pachycephalosaurus. |
Latest Record | Sereno 1998:62 |
Range (My) | |
Range (My) |
Triceratops, Pachycephalosaurus |
Range (My) |
Definitional History #3 | |
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Definitional History #6 | |
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Definitional History #7 | |
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Definitional History #8 | |
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Definitional History #9 | |
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Definitional History #10 | |
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