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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Definitional History #6 | |
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Definitional History #8 | |
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Definitional History #9 | |
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Definitional History #10 | |
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