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 |
Range (My) | |
Range (My) |
Pterosauria, Scleromochlus, Dinosauromorpha |
Range (My) |
Definitional History #2 | |
Earliest Record | Pterosauria, Dinosauromorpha, their most recent common ancestor, and all descendants. |
Latest Record | Benton 2004:15 |
Range (My) | |
Range (My) |
Pterosauria, Dinosauromorpha |
Range (My) |
Definitional History #3 | |
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Definitional History #4 | |
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Definitional History #5 | |
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Definitional History #6 | |
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Definitional History #7 | |
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Latest Record | |
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Definitional History #8 | |
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Latest Record | |
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Definitional History #9 | |
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Definitional History #10 | |
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