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Revision as of 19:40, 1 June 2006 editWouldn'tyouliketoknow (talk | contribs)39 edits It's certainly possible, but unconfirmed, that (some) dinosaurs are ancestral to birds.← Previous edit Revision as of 20:25, 1 June 2006 edit undoDinoguy2 (talk | contribs)Autopatrolled, Extended confirmed users39,966 edits clarificationNext edit →
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'''Ornithodira''' is a division of the ] (and perhaps ]ia) ]. Members of this clade were characterized by an upright ] and an S-curved neck, hence the name "Ornithodira" ("bird neck"). It contains two ]s, ] and ]. '''Ornithodira''' is a division of the ] (and perhaps ]ia) ]. Members of this clade were characterized by an upright ] and an S-curved neck, hence the name "Ornithodira" ("bird neck"). It contains two ]s, ] and ].


Dinosauromorpha contains the ]s, and their famous descendants, the ]s, some of which are perhaps ancestors of modern ]s. Dinosauromorpha contains the ]s, and their famous descendants, the ]s, some of which are considered by most modern scientists to be ancestors of modern ]s.


Pterosauromorpha contains ]ia, which are the famous flying reptiles, and perhaps the first ]s capable of ]. Most researchers think pterosaurians had neither an S-curved neck, nor an upright ]. However, the Ornithodira clade is still valid because it is defined as the last common ancestor of the dinosaurs and the pterosaurs, and all its descendants. Exactly which ] are included in this definition is still not very clear. Pterosauromorpha contains ]ia, which are the famous flying reptiles, and perhaps the first ]s capable of ]. Most researchers think pterosaurians had neither an S-curved neck, nor an upright ]. However, the Ornithodira clade is still valid because it is defined as the last common ancestor of the dinosaurs and the pterosaurs, and all its descendants. Exactly which ] are included in this definition is still not very clear.
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****** '''Class ]''' ****** '''Class ]'''


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Revision as of 20:25, 1 June 2006

Ornithodirans
Temporal range: Middle Triassic - Late Cretaceous (non-avian)
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Sauropsida
Subclass: Diapsida
Infraclass: Archosauromorpha
(unranked): Archosauria
Superorders

Ornithodira is a division of the Archosauromorpha (and perhaps Archosauria) clade. Members of this clade were characterized by an upright gait and an S-curved neck, hence the name "Ornithodira" ("bird neck"). It contains two superorders, Dinosauromorpha and Pterosauromorpha.

Dinosauromorpha contains the lagosuchians, and their famous descendants, the dinosaurs, some of which are considered by most modern scientists to be ancestors of modern birds.

Pterosauromorpha contains Pterosauria, which are the famous flying reptiles, and perhaps the first vertebrates capable of true flight. Most researchers think pterosaurians had neither an S-curved neck, nor an upright gait. However, the Ornithodira clade is still valid because it is defined as the last common ancestor of the dinosaurs and the pterosaurs, and all its descendants. Exactly which species are included in this definition is still not very clear.

Classification

Archosauria

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