Poposauridae

Poposauridae
Rango temporal: Triásico superior

Reconstrucción de Poposaurus gracilis
Taxonomía
Reino: Animalia
Filo: Chordata
Clase: Sauropsida
Subclase: Diapsida
Infraclase: Archosauromorpha
(sin rango): Crurotarsi
Orden: Rauisuchia
Familia: Poposauridae
Nopcsa, 1923
Géneros

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[editar datos en Wikidata]

Los poposáuridos (Poposauridae) son una familia de saurópsidos arcosaurios rauisuquios que vivieron a finales del período Triásico, desde el Carniense al Noriense, hace aproximadamente entre 228 a 203 millones de años. Se definen como el clado más inclusivo que contiene Poposaurus gracilis (Mehl, 1915) pero no a Crocodylus niloticus (Laurenti, 1768).

Los poposáuridos fueron unos grandes arcosaurios carnívoros, con un rango de longitud entre 2,5 a 5 metros que convivieron y posiblemente se alimentaron de los primeros dinosaurios en el Triásico Superior. Se conocen por fósiles de Sur y Norte América. Originalmente, Heune los considera como dinosaurios saurisquios posiblemente terópodos ya que comparten con estos últimos muchas características, en especial la cabeza y el caminar bípedo; análisis cladisticos más modernos han demostrado que tenían una posición más cercana con los cocodrilos.

Un análisis cladístico temprano de los arcosaurios cocodrilotarsianos incluyen a Poposaurus, Postosuchus, Teratosaurus y Bromsgroveia dentro de Poposauridae.[1]​ Sin embargo, posteriores estudios demostraron que Teratosaurus perteneció a Rauisuchidae.[2]​[3]​ Los más recientes análisis filogenéticos ubican a Postosuchus como un raisuquido[4]​ o a Prestosuchidae.[5]​[6]​[7]​

Géneros

Género Estatus Edad Lugar Descripción Imágenes
Nomen dubium. Triásico superior Bandera de Estados Unidos Estados Unidos
Válido. Triásico superior. Bandera de Estados Unidos Estados Unidos . Subfamilia Shuvosaurinae.
Válido. Triásico superior Bandera de Estados Unidos Estados Unidos.
Válido. Triásico superior. Bandera de Estados Unidos Estados Unidos. Subfamilia Shuvosaurinae.
Válido. Triásico superior Bandera de Argentina Argentina Subfamilia Shuvosaurinae.

Referencias

  1. ↑ Parrish JM. 1993. Phylogeny of the Crocodylotarsi, with reference to archosaurian and crurotarsan monophyly. Journal of Vertebrate Paleontology 13: 287-308.
  2. ↑ Long RA, Murry PA. 1995. Late Triassic (Carnian and Norian) tetrapods from the Southwestern United States. New Mexico Museum of Natural History & Science Bulletin 4: 1-254.
  3. ↑ Galton PM, Walker AD. 1996. Bromsgroveia from the Middle Triassic of England, the earliest record of a poposaurid thecodontian reptile (Archosauria: Rauisuchia). Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen 201 (3): 303-325.
  4. ↑ Weinbaum JC, Hungerbühler A. 2007. A revision of Poposaurus gracilis (Archosauria: Suchia) based on two new specimens from the Late Triassic of the southwestern U.S.A. Palaeontologische Zeitschrift 81(2):131-145.
  5. ↑ Gower DJ. 2002. Braincase evolution in suchian archosaurs: evidence from the rauisuchian Batrachotomus. Zoological Journal of the Linnean Society 136: 49-76.
  6. ↑ Nesbitt SJ, Norell MA. 2006. Extreme convergence in the body plans of an early suchian (Archosauria) and ornithomimid dinosaurs (Theropoda). Proceedings of the Royal Society of London B 273: 1045–1048.
  7. ↑ Nesbitt S. 2007. The anatomy of Effigia okeeffeae (Archosauria, Suchia), theropod-like convergance, and the distribution of related taxa. Bulletin of the American Museum of Natural History 302: 84 pp.

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