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Clade
Subclade Archosauria: Avemetatarsalia to Neornithes 

Taxon Feedback
Taxon Bagaceratopidae 
Nominal Author Alifanov 2003 
2° Nominal Author  
Taxon Status active
inactive
Comments  
Potential Synonomy  

Active Phylogenetic Definition Feedback
Active Definition  
Shorthand  
Definitional Author  
Definition Status original
textual substitution
first-order revision
second-order revision
Definition Type node
stem
Node-Stem Triplet yes
no
Other Triplet Taxa  
Specifiers
Specifier A  
Specifier(s) B  
Specifier(s) C  
Qualifiers
+Taxon  
-Taxon  
Datum  
Taxonomic Content stem (entirely extinct)
crown (extant-bounded)
mixed (extant/extinct-bounded)
Publication Year  

Inactive Taxon Status Feedback
Rejection Criteria junior synonym
historically polyphyletic
incomplete definition
no definition
apomorphy-based
redundant
other 
Critique No deifnition has been proposed. 
 

Current Age Range Feedback
Earliest Record  
Latest Record  
Range (My)  
Basis for Range