Dinosauromorpha

Information about Dinosauromorpha

Dinosauromorphs
Fossil range: Middle Triassic - Recent
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The early dinosauromorph Dromomeron

The early dinosauromorph Dromomeron
Scientific classification
Kingdom:Animalia
Phylum:Chordata
Class:Sauropsida
Infraclass:Archosauromorpha
(unranked)Ornithodira
(unranked)Dinosauromorpha
Benton, 1984
Clades


Dinosauromorpha is the name of 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, and Lagerpeton from the Ladinian of Argentina, 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] and potentially Sacisaurus from the Norian of Brazil,[2] and Technosaurus from the Carnian of Texas.[3] 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. As a stem clade definition was more functional, considering that only few basal Dinosauromorpha are known, and the relationship with Pterosauria is growing ever more problematic, a more prudent and exact 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. 
2. ^ 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. 
3. ^ 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. 

External links

The Middle Triassic (also known as Muschelkalk) is the second of three epochs of the Triassic period. It spans the time between 245 ± 1.5 Ma and 228 ± 2 Ma (million years ago). The Middle Triassic is divided into the Anisian and Ladinian faunal stages.
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Dromomeron
Irmis et al., 2007

Species

D. romeri Irmis et al., 2007

Dromomeron (meaning "running femur") is a genus of dinosauromorph archosaur from Late Triassic-age Chinle Formation rocks at Ghost
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Scientific classification or biological classification is a method by which biologists group and categorize species of organisms. Scientific classification also can be called scientific taxonomy, but should be distinguished from folk taxonomy, which lacks scientific basis.
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Chordata
Bateson, 1885

Typical Classes

See below

Chordates (phylum Chordata) are a group of animals that includes the vertebrates, together with several closely related invertebrates.
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Sauropsida*
Goodrich, 1916

Subclasses
  • Anapsida
  • Diapsida
Synonyms
  • Reptilia Laurenti, 1768
Reptiles are tetrapods and amniotes, animals whose embryos are surrounded by an amniotic membrane, and members of the class
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Archosauromorpha
von Huene, 1946

Orders

See text
Archosauromorpha (Greek for "ruling lizard forms") is an Infraclass of diapsid reptiles that first appeared during the late Permian and became more common during the Triassic.
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Ornithodira
Gauthier, 1986

Clades
  • Dinosauromorpha
  • Pterosauromorpha


Ornithodira is a clade within the larger group Archosauria. Another name for this group is Avemetatarsalia.
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Michael J. Benton is a professor of vertebrate palaeontology in the Department of Earth Sciences at the University of Bristol.

He is the author of several palaeontology text books (e.g. Vertebrate Palaeontology) and children's books.
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Dromomeron
Irmis et al., 2007

Species

D. romeri Irmis et al., 2007

Dromomeron (meaning "running femur") is a genus of dinosauromorph archosaur from Late Triassic-age Chinle Formation rocks at Ghost
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Lagerpeton

Species

L. canarensis  Romer, 1971

Lagerpeton is the name given to a genus of basal dinosauromorph from the Ladinian (Middle Triassic).
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Dinosauriformes
Novas, 1992

Clades
  • Dinosauria
  • Eucoelophysis
  • Lagosuchus
  • Lewisuchus
  • Marasuchus
  • Pseudolagosuchus
  • Sacisaurus
  • Silesaurus


Dinosauriformes
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Archosauria
Cope, 1869

Clades
  • Crurotarsi
  • Aetosauria
  • Crocodilia (crocodiles)
  • Phytosauria

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Dinosauria *
Owen, 1842

Orders & Suborders
  • Ornithischia
  • Cerapoda
  • Thyreophora
  • Saurischia

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Dinosauria *
Owen, 1842

Orders & Suborders
  • Ornithischia
  • Cerapoda
  • Thyreophora
  • Saurischia

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Marasuchus

Binomial name
Marasuchus illoensis
(Sereno & Arcucci, 1994)

Synonyms
  • Lagosuchus lilloensis Romer, 1972
Marasuchus
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Lagosuchidae

Genus: Lagosuchus

Binomial name
Lagosuchus talanpayenisis
Romer, 1972

Lagosuchus was a small archosaur from the Middle Triassic Period.
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Lagerpeton

Species

L. canarensis  Romer, 1971

Lagerpeton is the name given to a genus of basal dinosauromorph from the Ladinian (Middle Triassic).
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The Ladinian (also known as the Falangian) is a stage of the Middle Triassic epoch. It spans the time between 237 ± 2 Ma and 228 ± 2 Ma (million years ago).

Fauna

  • Spondylosoma
  • Dicynodonts

Archosauromorphs


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Motto
En unión y libertad   (Spanish)
"In Union and Freedom"
Anthem
Himno Nacional Argentino
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Dromomeron
Irmis et al., 2007

Species

D. romeri Irmis et al., 2007

Dromomeron (meaning "running femur") is a genus of dinosauromorph archosaur from Late Triassic-age Chinle Formation rocks at Ghost
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The Norian Stage was a portion of the Triassic geological period. It dates from 216.5 ± 2.0 to 203.6 ± 1.5 million years ago.

Fauna

  • Synapsids
  • Aetosaur
  • Dicynodonts
  • Phytosaur
  • Likhoelesaurus
  • Cryptoraptor

Ammonites


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State of New Mexico

Flag of New Mexico Seal
Nickname(s): Land of Enchantment / Tierra del Encanto
Motto(s): Crescit eundo

Capital Santa Fe
Largest city Albuquerque
Largest metro area
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State of Texas

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Nickname(s): Lone Star State
Motto(s): Friendship.
Before Statehood Known as
The Republic of Texas

Official language(s) No official language

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Silesaurus

Binomial name
Silesaurus opolensis
Dzik, 2003

Silesaurus is the name given to an enigmatic genus of dinosauriform (or perhaps basal dinosaur) from the Late Triassic.
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For the Carnian Alps, see Carnic Alps.


The Carnian (less commonly, Karnian) is the first stage of the Upper Triassic, Mesozoic. Its boundaries are not characterized by major extinctions or biotic turnovers, but a climatic event (known as the
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Motto
none1
Anthem
Mazurek Dąbrowskiego   (Polish)
Dąbrowski's Mazurek
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Eucoelophysis

Binomial name
Eucoelophysis baldwini
Sullivan & Lucas, 1999

Eucoelophysis
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