Ornithodira: Difference between revisions

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Revision as of 13:16, 2 October 2008 editTassedethe (talk \| contribs)Autopatrolled, Administrators1,374,111 editsm Disambiguate Michael Benton to Michael J. Benton using popups ← 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
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			#REDIRECT ]
	{{Taxobox

	\| name = Ornithodirans
			{{Redirect category shell\|
	\| fossil_range = ] - Recent
			{{R animal with possibilities}}
	\| image =
			{{R from subtopic}}
	\| image_width = 250px
			{{R with history}}
	\| image_caption =
	\| regnum = ]ia
	\| phylum = ]
	\| classis = ]a
	\| subclassis = ]
	\| infraclassis = ]
	\| unranked_ordo = ]
	\| unranked_familia = '''Ornithodira'''
	\| unranked_familia_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 as more derived forms the ]s, to a subgroup of which, the ], according to most modern scientists the ] belong. 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):

	'''Ornithodira'''
	\|--]
	\| \|
	\| `--]
	`--]
	\|--'']''
	`--]
	\|--'']''
	`--+--'']''
	`--+--'']''
	`--+--'']''
	`--]
	\|--]
	\| \|--]
	\| `--]
	\| \|--]
	\| `--]
	`--]

	{{Archosauromorpha}}

⚫	]

	]
	]
	]
	]
	]
	]
	]
	]

Latest revision as of 22:06, 19 April 2024

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Avemetatarsalia

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Category:

Avemetatarsalians