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Clade
Subclade Archosauria: Avemetatarsalia to Neornithes 
Taxon Feedback
Taxon Ankylosauridae 
Nominal Author Brown 1908 
2° Nominal Author  
Taxon Status active
inactive
Comments Ankylosauridae was initially defined by Sereno (1998) using Ankylosaurus and Panoplosaurus as internal and external specifiers, respectively, and this was followed recently by Vickaryous et al. (2004). The active definition is a first-order revision that uses species as specifiers (Ankylosaurus magniventris, Panoplosaurus mirus).  
Potential Synonomy Anchylosauridae (Lydekker 1909, spelling variant), Ancylosauridae (Huene 1908, spelling variant) 
Active Phylogenetic Definition Feedback
Active Definition The most inclusive clade containing Ankylosaurus magniventris Brown 1908 but not Panoplosaurus mirus Lambe 1919. 
Shorthand > Ankylosaurus magniventris but not Panoplosaurus mirus. 
Definitional Author Sereno 1998 
Definition Status original
textual substitution
first-order revision
second-order revision
Definition Type node
stem
Node-Stem Triplet yes
no
Other Triplet Taxa Ankylosauria, Nodosauridae 
Specifiers
Specifier A Ankylosaurus magniventris 
Specifier(s) B  
Specifier(s) C Panoplosaurus mirus 
Qualifiers
+Taxon  
-Taxon  
Datum  
Taxonomic Content stem (entirely extinct)
crown (extant-bounded)
mixed (extant/extinct-bounded)
Publication Year 1998 
Inactive Taxon Status Feedback
Rejection Criteria junior synonym
historically polyphyletic
incomplete definition
no definition
apomorphy-based
redundant
other 
Critique  
 
Current Age Range Feedback
Earliest Record Kimmeridgian-Tithonian (151 Ma) 
Latest Record Maastrichtian (66 Ma) 
Range (My) 85 
Basis for Range Gargoyleosaurus parkpinorum from the Morrison Formation (Kimmeridgian-Tithonian) is the oldest ankylosaurid and Ankylosaurus magniventris, from the Maastrichtian, is the youngest (Vickaryous et al. 2004). Dates are rounded to the nearest million, the earliest from the beginning of the stage and the latest from the end of the stage (Gradstein et al. 2004). 
Definitional History #1
Definition 1 All ankylosaurs closer to Ankylosaurus than to Panoplosaurus. 
Author Sereno 1998:61 
Type node  stem 
Specifiers Ankylosaurus, Panoplosaurus 
Qualifiers