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Clade
Subclade

Taxon
Taxon
Pygostylia
Nominal Author
Chatterjee 1997
2nd Nominal Author
Taxon Status INACTIVE
Comments
Potential Synonomy

Active Phylogenetic Definition
Active Definition
Shorthand
Definitional Author
Definition Status Unknown
Definition Type Unknown
Node-Stem Triplet Unknown
Other Triplet Taxa
Specifiers
Specifier(s) A
Specifier(s) B
Specifier(s) C
Qualifiers
+Taxon
-Taxon
Datum
Taxonomic Content
Publication Year Unknown
Unknown
Unknown

Inactive Taxon Status
Rejection Criteria other
Critique
Chiappe (2001:126) defined Chatterjee’s taxon Pygostylia as a node-based definition that is very similar in content to Ornithurae (sensu Sereno, 1998), a stem-based taxon that includes all birds closer to Neornithes than to Archaeopteryx. Pygostylia is node-based and so is not a junior synonym. If there are taxa that fall between Archaeopterygidae and Confuciusornithidae, Pygostylia would define a node at a less inclusive level than Ornithurae. Chiappe (2001:fig. 1) placed Rahonaves in this position, although other authors have placed it elsewhere. There seems little utility in using Pygostylia at present, if one accepts Ornithurae as a stem of a node-stem triplet centered on the traditional content of Aves.
 

Definitional History #1
Earliest Record
The common ancestor of Confuciusornithidae and Neornithes (modern birds) plus all its descendants.
Latest Record
Chiappe 2001:126
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Confuciusornithidae, Neornithes
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