Archosauromorpha characteristics

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ARCHOSAUROMORPHA - Archosauromorpha, Archosauria (clade), Thecodontia (grade)
Taxonomy Phylogeny 
o Sauria
|--Lepidosauromorpha
`--o Archosauromorpha
   |?--Choristodera
   `--+--Rhynchosauria
      `--+--Trilophosauridae
         `--+--Prolacertiformes
            `--o--Proterosuchidae 
               `--+--Erythrosuchidae
                  `--+--Euparkeriidae
                     `--o--Proterochampsidae
                        `--o Archosauria
                           |--o Ornithodira
                           |  |--Pterosauria
                           |  `--Dinosauromorpha
                           `--Crurotarsi

Archosauromorpha topics: | Archosauromorpha Characteristics | Ecology | Evolutionary History | Archosauriformes | Archosauria | "Thecodontia" | References | Links



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[edit] Technical characters

Cervical ribs with 2 heads; concave-convex articulation of astragalus & calcaneum; premaxilla extends dorsally behind nares & excludes maxilla; teeth in sockets; neck with 7-8 vertebrae; centra not deeply amphicoelous; pisiform usually absent in carpus; primitively, calcaneal tuber extends laterally beyond articulating surface of calcaneum (pulley for gastrocnemius – more upright position?).


[edit] Credits

Credits: Technical Characters ATW990924

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