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Clade
Subclade

Taxon
Taxon
Protoceratopsidae
Nominal Author
Granger and Gregory 1923
2nd Nominal Author
Taxon Status ACTIVE
Comments
Protoceratopsidae was initially used to inclde all basal neoceratopsians of small body size. It became clear, however, that these forms comprise a series of sister taxa to the large-bodied Ceratopsidae (Sereno 1986) when considered in a phylogenetic analysis. When so partitioned, there has been some cladistic support for a more restricted Asian clade that includes several Protoceratops andrewsi (Sereno 1986, 1999b). This more restricted monophyletic Protoceratopsidae was defined by Sereno (1998). The active definition is a first-order revision of this initial definition. Thus far, no other definitions have been proposed.
Potential Synonomy
Protoceratopidae (Steel 1969, spelling variant)

Active Phylogenetic Definition
Active Definition
The most inclusive clade containing Protoceratops andrewsi Granger and Gregory 1923 but not Triceratops horridus Marsh 1889.
Shorthand
> Protoceratops andrewsi but not Triceratops horridus.
Definitional Author
Sereno 2005
Definition Status checked
Definition Type STEM
Node-Stem Triplet STEM
Other Triplet Taxa
Coronosauria, Ceratopsoidea
Specifiers
Specifier(s) A
Protoceratops andrewsi
Specifier(s) B
Specifier(s) C
Triceratops horridus
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 Protoceratops than to Triceratops.
Latest Record
Sereno 1998:62
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Protoceratops, Triceratops
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