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Dinosauromorpha
Fossil range: Middle Triassic - Recent
Dromomeron BW
The early dinosauromorph Dromomeron
Scientific classification

Class

Sauropsida

Infraclass

Archosauromorpha

(Unranked)

Ornithodira

(Unranked)

Dinosauromorpha
Benton, 1984

Clades



Dinosauromorpha is a clade of archosaurs that includes the direct sister groups of dinosaurs, and the order Dinosauria itself. Basal forms include Marasuchus, the perhaps identical Lagosuchus, the lagerpetonids Lagerpeton from the Ladinian of Argentina and Dromomeron from the Norian of Arizona, New Mexico, and Texas, and "silesaurs", which include Silesaurus from the Carnian of Poland, Eucoelophysis from the Carnian-Norian of New Mexico, Pseudolagosuchus from the Ladinian of Argentina,[1][2] and potentially Sacisaurus from the Norian of Brazil,[3] and Technosaurus from the Carnian of Texas.[4] Birds are the only surviving dinosauromorphs.

The name was coined by Michael J. Benton in 1984. The first clade definitions were by Paul Sereno in 1991 who accidentally defined the concept as both a node clade: the last common ancestor of Lagerpeton chanarensis, Lagosuchus talampayensis, Pseudolagosuchus major and the Dinosauria (including Aves) and all its descendants, and a stem clade: those Ornithodira more closely related to Dinosauria than to Pterosauria. A more specific definition was given by Sereno in 2005: the group consisting of Passer domesticus (Linnaeus 1758) and all species closer to Passer than to Pterodactylus antiquus (Soemmerring 1812), Ornithosuchus woodwardi (Newton 1894) and Crocodylus niloticus (Laurenti 1768). Should the pterosaurs not be closely related to the dinosaurs, this new definition would still be relevant, defining also the relation to the Crurotarsi; in that case it would be an older synonym of Avemetatarsalia.

References[]

  1. ^ Irmis, Randall B.; Nesbitt, Sterling J.; Padian, Kevin; Smith, Nathan D.; Turner, Alan H.; Woody, Daniel; and Downs, Alex (2007). "A Late Triassic dinosauromorph assemblage from New Mexico and the rise of dinosaurs". Science 317: 358–361. doi:10.1126/science.1143325. PMID 17641198. 
  2. ^ Nesbitt, Sterling J.; Irmis, Randall B.; Parker, William G.; Smith, Nathan D.; Turner, Alan H.; and Rowe, Timothy (2009). "Hindlimb osteology and distribution of basal dinosauromorphs from the Late Triassic of North America". Journal of Vertebrate Paleontology 29 (2). 
  3. ^ Ferigolo, J.; and Langer, M.C. (2006). "A Late Triassic dinosauriform from south Brazil and the origin of the ornithischian predentary bone". Historical Biology 19 (1): 1–11. http://www.journalsonline.tandf.co.uk/(ciigzuqwmoomny2lspjqn155)/app/home/contribution.asp?referrer=parent&backto=issue,3,14;journal,1,8;linkingpublicationresults,1:300240,1. 
  4. ^ Nesbitt, Sterling J.; Irmis, Randall B.; and Parker, William G. (2007). "A critical re-evaluation of the Late Triassic dinosaur taxa of North America". Journal of Systematic Palaeontology 5 (2): 209–243. doi:10.1017/S1477201907002040. 


External links[]


Archosauromorphs
Primitive ArchosauromorphsEuparkeriidae • Erythrosuchidae • Proterochampsidae • Proterosuchidae • Choristodera • Prolacertiformes • Rhynchosauria • Trilophosauria

Crurotarsi ArchosaursOrnithosuchidae • Aetosauria • Phytosauria • Rauisuchia • Crocodylomorpha • Crocodilia

Avemetatarsalia and Ornithodira ArchosaursScleromochlus • Pterosauria • Dinosauromorpha • Dinosauria • Ornithischia • Saurischia • Aves

Avian ArchosaursAvialae • Archaeopteryx • Confuciusornis • Ichthyornis • Enantiornithes • Hesperornithes • Neornithes • Paleognathae • Neognathae
Postosuchus BW
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