Archosauromorpha

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Archosauromorphs
Fossil range: Middle Permian - Recent

Trilophosaurus, a primitive archosauromorph

Scientific classification

Kingdom:	Animalia
Phylum:	Chordata
Class:	Sauropsida
Subclass:	Diapsida
Infraclass:	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. Included in this infraclass are the orders Rhynchosauria, Trilophosauridae, Prolacertiformes, Archosauriformes, and, tentatively, the Choristodera. While superficially these reptiles vary in appearance (at one time they were even included in different subclasses-- the Trilophosaurs were considered Euryapsids, and the Rhynchosaurs were considered lepidosaurs and were included in the same order as the tuatara), they are actually united by a number of small skeletal and skull-related details that suggest they form a clade that descended from a single common ancestor.

Of the five taxa mentioned above, the first three died out at or prior to the end Triassic extinction. The Choristoderans continued as a minor group until the Miocene, and the Archosauriformes were important factors in early Triassic environments before giving rise to the even more successful Archosauria.

1 Taxonomy
- 1.1 Classification
- 1.2 Phylogeny
2 External links

[edit] Taxonomy

[edit] Classification

Subclass Diapsida
- Infraclass ARCHOSAUROMORPHA
  - Family Euparkeriidae
  - Family Erythrosuchidae
  - Family Proterochampsidae
  - Family Proterosuchidae
  - Order Choristodera
  - Order Prolacertiformes
  - Order Rhynchosauria
  - Order Trilophosauria
  - Division Archosauria
    - Subdivision Crurotarsi
      - Order Aetosauria
      - Order Phytosauria
      - Order Rauisuchia
      - Superorder Crocodylomorpha
        
        Order Crocodilia
    - Subdivision Avemetatarsalia
      - Order Pterosauria
      - Superorder Dinosauria
        
        Order Ornithischia
        
        Order Saurischia

[edit] Phylogeny

Archosauromorpha

 |--+--Rhynchosauria
 |   `--+-?Teraterpeton
 |      `--Trilophosauria
 `--+--Prolacertiformes
   `--Archosauriformes
         |-?Uatchitodon
         |--Proterosuchidae
         `--+-?Erythrosuchidae
            `--+-?Heleosaurus
               `--+--Euparkeriidae
                  `--Avesuchia
                        |-?Turfanosuchus
                        |--Proterochampsidae
                        `--+--Yonghesuchus
                           `--Archosauria
                                 |--Crurotarsi (crocodiles and relatives)
                                 `--Ornithodira (dinosaurs, pterosaurs, and birds)