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Clade
Subclade Archosauria: Avemetatarsalia to Neornithes 
Taxon Feedback
Taxon Ankylopollexia 
Nominal Author Sereno 1986 
2° Nominal Author  
Taxon Status active
inactive
Comments Coined by Sereno (1986) and defined by Sereno (1998), Ankylopollexia was named after the apomorphic stiff cone-shaped thumb that characterizes most members and defined as a node-based taxon. The active phylogenetic definition is a first-order revision that uses species instead of genera. 
Potential Synonomy  
Active Phylogenetic Definition Feedback
Active Definition The least inclusive clade containing Camptosaurus dispar (Marsh 1879) and Parasaurolophus walkeri Parks 1922. 
Shorthand < Camptosaurus dispar and Parasaurolophus walkeri. 
Definitional Author Sereno 2005 
Definition Status original
textual substitution
first-order revision
second-order revision
Definition Type node
stem
Node-Stem Triplet yes
no
Other Triplet Taxa Camptosauridae, Styracosterna 
Specifiers
Specifier A Camptosaurus dispar 
Specifier(s) B Parasaurolophus walkeri 
Specifier(s) C  
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 (156 Ma) 
Latest Record Maastrichtian (66 Ma) 
Range (My) 90 
Basis for Range The Late Jurassic (Kimmeridgian) species Camptosaurus prestwichii, from the Kimmeridge Clay, is currently the oldest member (Norman 2004). The youngest members of the clade are hadrosaurids of Maastrichitan age. 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 Camptosaurus, Parasaurolophus, their most recent common ancestor and all descendants. 
Author Sereno 1998:62 
Type node  stem 
Specifiers Camptosaurus, Parasaurolophus 
Qualifiers