from Wikipedia, the free encyclopedia
The carnivorous Ornithosuchus (Crurotarsi) and its prey Hyperodapedon (Rhynchosauria), both Triassic members of the Archosauromorpha

The carnivorous Ornithosuchus ( Crurotarsi ) and its prey Hyperodapedon ( Rhynchosauria ), both Triassic members of the Archosauromorpha

Temporal occurrence
Upper Permian to this day
260.5 to 0 million years
  • Worldwide
Land vertebrates (Tetrapoda)
Amniotes (Amniota)
Eureptiles (Eureptilia)
Scientific name
von Huene , 1946

The Archosauromorpha are a family group of the diapsid reptiles , to which the archosaurs and various extinct reptile groups belong, which are more closely related to the archosaurs than to the lepidosaurs . The corresponding sister group of the Archosauromorpha are the Lepidosauromorpha .

The diagnostic features of the early ("primitive") representatives of the group include thecodonten teeth (teeth in tooth sockets ), the absence of a sternum , a joint between the talus (astragalus) and heel bone (calcaneus) within the tarsus and a hook-shaped fifth metatarsal bone , which is connected to the fourth metatarsal bone, as well as the phalangeal formula 2-3-4-5-4 (number of phalanges of the respective toe). Her neck had seven to eight vertebrae .

All Archosauromorpha groups that do not belong to the Archosauria taxon died out during or at the end of the Triassic , with the exception of the Choristodera . The Choristodera survived until the end of the Eocene . The only archosauromorphs living today belong to the Archosauria groups of crocodiles and birds .


  • Robert L. Carroll: Paleontology and Evolution of the Vertebrates . Thieme, Stuttgart (1993), ISBN 3-13-774401-6
  • Martin Sander: Reptiles . Enke, Stuttgart (1994), ISBN 3-432-26021-0

Web links

Commons : Archosauromorpha  - collection of images, videos and audio files