View Details:  Prev Record    Next Record
Clade
Subclade

Taxon
Taxon
Ceratopsoidea
Nominal Author
Marsh 1888
2nd Nominal Author
Hay 1902
Taxon Status ACTIVE
Comments

The definition of Ceratopsoidea is a first order revision of that in Sereno (1998) that uses species. Wolfe and Kirkland (1998) recently proposed a form-qualified definition for Ceratopsomorpha based on the presence of brow horns. That definition overlaps with Ceratopsoidea in definitional type (stem) and taxonomic content. The node-stem triplet identified by Ceratopsoidea and its affiliated taxa present a more stable taxonomy than one based on an apomorphy that is not always preserved and subject to change during growth.

Hay (1902) was first to use the superfamilial form of Marsh's family group (Ceratopsoidea), which he later modified to Ceratopsoidae (Hay 1930), here considered a spelling variant.

 

Potential Synonomy
Ceratopsoidae (Hay 1930, spelling variant), Ceratopsomorpha

Active Phylogenetic Definition
Active Definition
The most inclusive clade containing Triceratops horridus Marsh 1889 but not Protoceratops andrewsi Granger and Gregory 1923.
Shorthand
> Triceratops horridus but not Protoceratops andrewsi.
Definitional Author
Sereno 2005
Definition Status checked
Definition Type STEM
Node-Stem Triplet STEM
Other Triplet Taxa
Coronosauria, Protoceratopsidae
Specifiers
Specifier(s) A
Triceratops horridus
Specifier(s) B
Specifier(s) C
Protoceratops andrewsi
Qualifiers
+Taxon
-Taxon
Datum
Taxonomic Content
Publication Year Unknown
Unknown
Unknown
1998

Inactive Taxon Status
Rejection Criteria
Critique
 

Definitional History #1
Earliest Record
All coronosaurs closer to Triceratops than to Protoceratops.
Latest Record
Sereno 1998:62
Range (My)
Range (My)
Protoceratops, Triceratops
Range (My)

Definitional History #2
Earliest Record
Latest Record
Range (My)
Range (My)
Range (My)

Definitional History #3
Earliest Record
Latest Record
Range (My)
Range (My)
Range (My)

Definitional History #4
Earliest Record
Latest Record
Range (My)
Range (My)
Range (My)

Definitional History #5
Earliest Record
Latest Record
Range (My)
Range (My)
Range (My)

Definitional History #6
Earliest Record
Latest Record
Range (My)
Range (My)
Range (My)

Definitional History #7
Earliest Record
Latest Record
Range (My)
Range (My)
Range (My)

Definitional History #8
Earliest Record
Latest Record
Range (My)
Range (My)
Range (My)

Definitional History #9
Earliest Record
Latest Record
Range (My)
Range (My)
Range (My)

Definitional History #10
Earliest Record
Latest Record
Range (My)
Range (My)
Range (My)