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Clade
Subclade

Taxon
Taxon
Ornithodira
Nominal Author
Gauthier 1986
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

The first definition of Ornithodira was node-based (Sereno 1991) and has been followed in large measure by a second definition (Benton 2004). Avemetatarsalia is stem-based and currently includes identical taxonomic content. If pterosaurs are maintained within this clade and additional memebrs are discovered more basal that pterosaurs, then the content of Ornithodira would differ from the more inclusive Avemetatarsalia (Benton 1999). However, until such an unlikely scenario unfolds, the two taxa, Avemetatarsalia and Ornithodia, have identical taxonomic content. Avemetatarsalia is part of a node-stem triplet (Archosauria = Crurotarsi + Avemetatarsalia) and is regarded as the more important taxon of the two for use by taxonomists that would like to refer to archosaurian taxa more closely related to birds.

Recently de Queiroz and Gauthier (2001) coined and defined Panaves, which explcitly overlaps the stem-based definition of Avemetatarsalia (see Avemetatarsalia for more discussion of issues involving Ornithodira).

 

Definitional History #1
Earliest Record
Pterosauria, Scleromochlus, Dinosauromorpha (including birds), and all descendants of their common ancestor.
Latest Record
Sereno 1991:34
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Pterosauria, Scleromochlus, Dinosauromorpha
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Definitional History #2
Earliest Record
Pterosauria, Dinosauromorpha, their most recent common ancestor, and all descendants.
Latest Record
Benton 2004:15
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Pterosauria, Dinosauromorpha
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