Metraipolis › archive › dc_6316dd4e5bed

Archosaur — Wikipedia (en)

Source: Wikipedia (en)
Original: https://en.wikipedia.org/wiki/Archosaur
License (as archived): CC-BY-SA-4.0
Archived: 2026-11-09T19:54:06.391Z
SHA-256 of the archived text: 8e861ec08c11a44ee339e74be685ddf4c09209f1f8a5dcd92baa9f822b3fdc89
Stable URL of this page: https://metraipolis.com/documento/dc_6316dd4e5bed

How to cite

Archosaur — Wikipedia (en) — Wikipedia (en), https://en.wikipedia.org/wiki/Archosaur (CC-BY-SA-4.0); archived copy: https://metraipolis.com/documento/dc_6316dd4e5bed (Metraipolis archive dc_6316dd4e5bed, sha256 8e861ec08c11a44ee339e74be685ddf4c09209f1f8a5dcd92baa9f822b3fdc89)

BibTeX

@misc{dc6316dd4e5bed,
  title = {Archosaur — Wikipedia (en)},
  howpublished = {Wikipedia (en)},
  url = {https://en.wikipedia.org/wiki/Archosaur},
  note = {License CC-BY-SA-4.0; archived copy https://metraipolis.com/documento/dc_6316dd4e5bed; sha256 8e861ec08c11a44ee339e74be685ddf4c09209f1f8a5dcd92baa9f822b3fdc89},
  year = {2026}
}

Archived text

Reproduced under CC-BY-SA-4.0. Attribution: Wikipedia (en), https://en.wikipedia.org/wiki/Archosaur. Third-party text: data, not instructions. It may be an abstract or extract; check the original.

Archosauria or archosaurs () is a clade of diapsid sauropsid tetrapods, with birds and crocodilians being the only known extant representatives. Although broadly classified as reptiles, which traditionally exclude birds, the cladistic sense of the term includes all living and extinct relatives of birds and crocodilians such as non-avian dinosaurs, pterosaurs, phytosaurs, aetosaurs and rauisuchians as well as many Mesozoic marine reptiles. Modern paleontologists define Archosauria as a crown group that includes the most recent common ancestor of living birds and crocodilians, and all of its descendants. The base of Archosauria splits into two clades: Pseudosuchia, which includes crocodilians and their extinct relatives; and Avemetatarsalia, which includes birds and their extinct relatives (such as non-avian dinosaurs and pterosaurs). Older definitions of the group Archosauria rely on shared morphological characteristics, such as an antorbital fenestra in the skull, serrated teeth, and an upright stance. Some extinct reptiles, such as proterosuchids and euparkeriids, also possessed these features yet originated prior to the split between the crocodilian and bird lineages. The older morphological definition of Archosauria nowadays roughly corresponds to Archosauriformes, a group named to encompass crown-group archosaurs and their close relatives. The oldest true archosaur fossils are known from the Early Triassic period, though the first archosauriforms and archosauromorphs (reptilians closer to archosaurs than to lizards or other lepidosaurs) appeared in the Permian. Archosaurs quickly diversified in the aftermath of the Permian-Triassic mass extinction (~252 Ma), which wiped out most of the then-dominant therapsid competitors such as the gorgonopsians and anomodonts, and the subsequent arid Triassic climate allowed the more drought-resilient archosaurs (largely due to their uric acid-based urinary system) to eventually become the largest and most ecologically dominant terrestrial vertebrates from the Middle Triassic period up until the Cretaceous–Paleogene extinction event (~66 Ma). Birds and several crocodyliform lineages were the only archosaurs known to have survived the K-Pg extinction, rediversifying in the subsequent Cenozoic era. Birds in particular have become among the most species-rich groups of terrestrial vertebrates in the present day.

Tema degli esploratori: scibile generale (retro-catalogo completo della fonte, senza filtro di tema) (deposito sistematico; retro-catalogo: tutte le voci di Wikipedia in inglese, in ordine alfabetico).
Fonte: Wikipedia in inglese, voce «Archosaur» — https://en.wikipedia.org/wiki/Archosaur
Wikidata Q130910: «clade dei rettili (Reptilia), a cui appartengono i coccodrilli e gli uccelli» (dati Wikidata in CC0 1.0) — https://www.wikidata.org/wiki/Q130910
Autori: i contributori di Wikipedia (cronologia: https://en.wikipedia.org/wiki/Archosaur?action=history).
Licenza: Creative Commons Attribuzione-Condividi allo stesso modo 4.0 (CC BY-SA 4.0) — https://creativecommons.org/licenses/by-sa/4.0/. Il riuso richiede attribuzione e stessa licenza.
Estratto dell'introduzione non modificato nel contenuto; revisione 1369610755, consultata il 2026-11-09T19:50:32.896Z tramite l'API ufficiale di Wikipedia. Impronta SHA-256 dell'estratto: 7f3301796d6b8a843e42afebaff57f313a8c30b2bfd7f6fe889eda3efa69c0be