| Revision as of 16:06, 20 January 2010 editDSisyphBot (talk | contribs)77,126 editsm robot Adding: fr:Ornithodirien← Previous edit |
Latest revision as of 22:06, 19 April 2024 edit undoPlantdrew (talk | contribs)Autopatrolled, Extended confirmed users, New page reviewers646,022 edits added Category:Avemetatarsalians using HotCat |
| (15 intermediate revisions by 7 users not shown) |
| Line 1: |
Line 1: |
|
⚫ |
#REDIRECT ] |
|
{{Unreferenced|date=December 2009}} |
|
|
|
|
|
{{Taxobox |
|
|
|
{{Redirect category shell| |
|
| name = Ornithodirans |
|
|
|
{{R animal with possibilities}} |
|
| fossil_range = {{Fossil_range|245|0|] - Recent}} |
|
|
|
{{R from subtopic}} |
|
| image = Marasuchus.JPG |
|
|
|
{{R with history}} |
|
| image_caption = Mounted skeleton of '']'', an early ] |
|
|
| regnum = ]ia |
|
|
| phylum = ] |
|
|
| classis = ] |
|
|
| subclassis = ] |
|
|
| infraclassis = ] |
|
|
| unranked_ordo = ] |
|
| ⚫ |
| unranked_familia = ] |
|
|
| unranked_genus = '''Ornithodira''' |
|
|
| unranked_genus_authority = ], 1986 |
|
|
| subdivision_ranks = Clades |
|
|
| subdivision = |
|
|
* ] |
|
|
* ] |
|
|
}} |
|
}} |
|
|
|
|
|
⚫ |
] |
|
'''Ornithodira''' is a ] within the larger group ]ia. |
|
|
|
|
|
In 1986 ] coined the name for a node clade, containing the last common ancestor of the ]s and the ] and all of its descendants. In 1991 ] was the first to give a formal definition, that explicitly included '']'' and thus potentially was a larger group than Ornithodira ''sensu Gauthier''. In 1999 ] concluded that ''Scleromochlus'' was indeed outside of Ornithodira ''sensu Gauthier''; that year he defined a stem clade ] for all Archosauria ''sensu Gauthier'' (Benton's own ]) that were closer to dinosaurs than to ]. In 2004 Benton gave a formal definition of Ornithodira ''sensu Gauthier''. In 2005 Sereno stated the opinion that Ornithodira was not a useful concept, whereas Avemetatarsalia was. |
|
|
|
|
|
Members of Ornithodira are characterized by an upright ] and an S-curved neck, hence the name "Ornithodira" ("bird necks"). It is by definition strictly divided into two sub]s: ] and ]. |
|
|
|
|
|
Dinosauromorpha contains more basal forms like '']'' and '']'' and more derived forms like ]s, which according to most modern scientists the ] belong to as members of the ]. The Ornithodira are therefore still extant. |
|
|
|
|
|
Pterosauromorpha contains ]ia, which are the famous flying reptiles, and as far as is known the first ]s capable of ]. Most researchers think pterosaurians had neither an S-curved neck, nor an upright ]: the clade Ornithodira is defined on basis of ancestry, not characters – and it is always possible later descendants show a change in characters. |
|
|
|
|
|
==Phylogeny== |
|
|
] after Ezcurra (2006): |
|
|
{{Clade| style=font-size:90%;line-height:85% |
|
|
|label1='''Ornithodira''' |
|
|
|1={{Clade |
|
|
|label1= ] |
|
|
|1={{Clade |
|
|
|1=]}} |
|
|
|label2= ] |
|
|
|2={{Clade |
|
|
|1='']'' |
|
|
|label2= ] |
|
|
|2={{Clade |
|
|
|1='']'' |
|
|
|2={{Clade |
|
|
|1='']'' |
|
|
|2={{Clade |
|
|
|1='']'' |
|
|
|2={{Clade |
|
|
|1='']'' |
|
|
|label2= ] |
|
|
|2={{Clade |
|
|
|label1= ] |
|
|
|1={{Clade |
|
|
|1=] |
|
|
|label2= ] |
|
|
|2={{Clade |
|
|
|1=] |
|
|
|2=]}} }} |
|
|
|2=] |
|
|
}} }} }} }} }} }} }} }} |
|
|
|
|
|
{{Archosauromorpha}} |
|
|
|
|
| ⚫ |
] |
|
|
|
|
|
] |
|
|
] |
|
|
] |
|
|
] |
|
|
] |
|
|
] |
|
|
] |
|
|
] |
|
|
] |
|
|
] |
|
|
] |
|